CN113373734B - Modified straw and application thereof in preparation of corrugated paper - Google Patents
Modified straw and application thereof in preparation of corrugated paper Download PDFInfo
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- CN113373734B CN113373734B CN202110671153.9A CN202110671153A CN113373734B CN 113373734 B CN113373734 B CN 113373734B CN 202110671153 A CN202110671153 A CN 202110671153A CN 113373734 B CN113373734 B CN 113373734B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/10—Packing paper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/02—Processes; Apparatus
- B27K3/0207—Pretreatment of wood before impregnation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/34—Organic impregnating agents
- B27K3/50—Mixtures of different organic impregnating agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/001—Heating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/003—Treating of wood not provided for in groups B27K1/00, B27K3/00 by using electromagnetic radiation or mechanical waves
- B27K5/0065—Ultrasonic treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K9/00—Chemical or physical treatment of reed, straw, or similar material
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/02—Pretreatment of the raw materials by chemical or physical means
- D21B1/021—Pretreatment of the raw materials by chemical or physical means by chemical means
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
- D21H11/20—Chemically or biochemically modified fibres
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Abstract
The invention discloses modified straw and application thereof in preparation of corrugated paper, and relates to the technical field of packaging materials. The modified straw is vidarabine monophosphate grafted modified straw; adding the paper pulp into corrugated paper pulp to produce corrugated paper. The modified straw prepared by the invention is used as a paper pulp raw material and is compounded with corrugated paper pulp to prepare high-strength corrugated paper, and the burst strength, the tear strength, the ring crush strength and the tensile strength of the corrugated paper are obviously improved; and the cushion performance is excellent, and the water resistance is good. The production process of the corrugated paper fully utilizes the crop straws, is beneficial to environmental protection and increase of the income of farmers, and simultaneously reduces the use amount of high-quality paper pulp and can reduce the production cost.
Description
Technical Field
The invention belongs to the technical field of packaging materials, and particularly relates to modified straws and application thereof in preparation of corrugated paper.
Background
Corrugated board is a fiber-based material that includes corrugated medium and at least one flat liner or liner attached to the surface of the corrugated medium, thereby forming a sandwich structure. A corrugating machine is used to form a corrugated medium into a corrugated shape by using heat, moisture, and pressure.
In the packaging industry of China, corrugated boards have already occupied a leading position, the development of the corrugated boards has a history of more than 100 years, in the production enterprises of China, the occupation ratio of the corrugated boards is more than eight, particularly in some developed cities along the sea, the corrugated boards need to be used for packaging the corrugated boards regardless of export or internal sales, and the corrugated boards are characterized in that the compression strength of the corrugated boards is high, in recent years, the judgment of the corrugated boards is developed from simple water touch to the measurement of precise instruments, and the attention on the corrugated boards is continuously increased, and the requirements are higher and higher, but in most of the existing corrugated board manufacturing enterprises, the production of corrugated base paper is also carried out by adopting a recycled paper technology, but a plurality of problems are relatively generated, for example: (1) how to ensure the strength of the recycled paper; (2) how to reduce the cost to the minimum under the condition of solving the strength problem and ensure the production struggle operation of enterprises; (3) how to simplify the production process and not influence the production quality. How to solve the basic problems is always the power of continuous innovation of enterprises.
The global demand for paper and paper pulp is continuously increasing, but the global forest resources for producing wood pulp raw materials are limited, and the development of new paper pulp sources by adopting an environment-friendly and energy-saving green technology is a necessary trend. The straw is a main crop byproduct in China, and the annual yield is nearly 7 hundred million tons. Most of crop straws are burned on the spot, which not only causes resource waste, but also causes huge pollution to the environment. At present, the utilization research of straws in many countries in the world is more and more concerned, and the straw is pretreated and then used in the paper making industry by adopting the green environment-friendly energy-saving technology, so that the increasingly prominent energy and environment problems are favorably relieved. Straw pulping provides a conversion process for converting solid raw materials into solid products, saves traditional raw materials such as wood and the like, and effectively reverses the passive situation that forest resources are deficient in China and dependence of paper making industry on wood pulp import is too high. Meanwhile, the byproduct hemicellulose xylan aqueous solution generated in the straw pulping production process is a raw material of high value-added xylo-oligosaccharide, crystalline xylose, arabinose, xylitol and furfural series products, and straw resources are comprehensively utilized. In general, the development of straw clean pulping is an effective way to meet the requirements of the future papermaking fiber raw materials.
Disclosure of Invention
The invention aims to provide modified straws and application thereof in preparing corrugated paper, wherein the modified straws are used as a paper pulp raw material and are compounded with corrugated paper pulp to prepare the high-strength corrugated paper, and the bursting strength, the tearing strength, the ring crush strength and the tensile strength of the corrugated paper are obviously improved; and the cushion performance is excellent, and the water resistance is good.
The technical scheme adopted by the invention for realizing the purpose is as follows:
a modified straw is a vidarabine monophosphate grafted modified straw. The straw contains cellulose, hemicellulose, lignin and other fiber components, and is a pure natural high-quality papermaking raw material. But the direct pulping by adopting straws has defects and poor paper quality. The invention adopts vidarabine monophosphate to graft the straw to prepare the modified straw, and the modified straw is used as a paper pulp raw material to be applied to the preparation of paper or paperboard, so that the obtained product has excellent quality and obviously enhanced physical properties. The modified straw and the corrugated paper pulp prepared by the method are compounded for use, so that the internal bonding strength with other materials can be enhanced, the supporting effect is greatly enhanced, the prepared corrugated paper has excellent physical strength, and the burst strength, the tensile strength and the ring crush strength are obviously improved; in addition, the existence of the vidarabine monophosphate grafted straw also effectively improves the buffer performance of the corrugated paper.
Preferably, the grafting rate of the modified straws is more than or equal to 18 percent.
Preferably, the preparation method of the modified straws comprises the following steps:
pre-treating, washing and drying the straws, then crushing the straws, soaking the straws in deionized water, drying the straws, then sieving the straws with a 100-150-mesh sieve, stewing the straws with alkali liquor, and drying the straws to obtain straw powder;
carrying out graft modification, mixing the pretreated straw powder with DMF (dimethyl formamide), carrying out ultrasonic treatment, adding vidarabine monophosphate and catalyst urea under the stirring condition, heating to 60-80 ℃, and reacting for 3-5.5 h; cooling to room temperature, filtering and drying to obtain the modified straw.
Preferably, the straw is one or more of straw stalk, wheat straw stalk, cotton stalk, corn stalk, soybean stalk and sorghum stalk.
Preferably, the adding amount of DMF in the grafting modification is 0.8-1.3% of the straw powder; the addition amount of vidarabine monophosphate is 40-46% of the mass of the straw powder; the adding amount of the urea is 4.5-6.6% of the mass of the straw powder.
Preferably, carbachol with the mass concentration of 0.9-1.2% is added into the pretreated alkali liquor. After alkali liquor treatment, the internal structure of the straw is damaged and recombined to a certain degree, the structure is changed, the surface area is increased, and hydroxyl groups in a molecular chain are exposed, so that the subsequent grafting modification of the corn straw is facilitated; the carbachol is added into the alkali liquor, so that the influence on the internal structure of the straw is enhanced, and the regular arrangement of the original crystalline region of the straw is probably further disturbed, so that the crystallinity of the straw is reduced, the vidarabine monophosphate grafting is more facilitated, and the grafting rate is increased; the hydrogen bond acting force is stronger after grafting modification, and the modified paper pulp acts with other components as a paper pulp raw material to form a network structure which is tighter, so that the water absorption performance of the corrugated paper is effectively reduced; meanwhile, the ring crush strength and tensile strength of the corrugated paper can be enhanced, and the tearing strength of the corrugated paper is improved. And the compound is compounded with vidarabine monophosphate for use, so that the performance enhancement effect on corrugated paper is better, and the physical strength, the buffering performance and the water resistance of the corrugated paper are obviously enhanced.
The invention also discloses application of the carbachol in improving the grafting rate of the modified straws.
The invention also discloses the application of the modified straw in the preparation of corrugated paper. The production process of the corrugated paper fully utilizes the crop straws, is beneficial to environmental protection and increase of the income of farmers, and simultaneously reduces the use amount of high-quality paper pulp and can reduce the production cost.
Preferably, the preparation of corrugated paper comprises: adding the modified straws into corrugated paper pulp according to a proportion to produce corrugated paper; wherein the adding amount of the modified straws is 23-46% of the mass of the corrugated paper pulp.
Preferably, the modified straw is used for enhancing the burst strength, the tensile strength, the ring crush strength and the buffer performance of corrugated paper.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts vidarabine monophosphate to graft the straw to prepare the modified straw, and the modified straw is used as a paper pulp raw material to be applied to the preparation of paper or paperboard, so that the obtained product has excellent quality and obviously enhanced physical properties. The modified straw and the corrugated paper pulp prepared by the method are used in a composite mode, and the prepared corrugated paper has excellent physical strength, and the burst strength, the tensile strength and the ring crush strength are remarkably improved; and the buffering performance of the corrugated paper is also effectively improved. The carbachol is added into the alkali liquor after the straw pretreatment, so that the vidarabine monophosphate is more favorably grafted, and the grafting rate is increased; the hydrogen bond acting force is stronger after grafting modification, and the paper pulp is used as a paper pulp raw material to act with other components, so that a network structure is formed more closely, and the water absorption performance of the corrugated paper is further effectively reduced; meanwhile, the ring crush strength and tensile strength of the corrugated paper can be effectively enhanced, and the tearing strength of the corrugated paper is improved. In addition, vidarabine monophosphate and carbachol are simultaneously used in the preparation process of the modified straw, so that the performance enhancing effect on corrugated paper is better. The invention applies the crop straws to the paper pulp, is beneficial to environmental protection and increase of the income of farmers, and simultaneously reduces the usage amount of high-quality paper pulp and can reduce the production cost.
Therefore, the invention provides modified straws and application thereof in preparing corrugated paper, the modified straws are used as a paper pulp raw material and are compounded with corrugated paper pulp to prepare the high-strength corrugated paper, and the burst strength, the tear strength, the ring crush strength and the tensile strength of the corrugated paper are obviously improved; and the cushion performance is excellent, and the water resistance is good.
Drawings
FIG. 1 shows the results of IR spectroscopy in test example 1 of the present invention.
Detailed Description
The technical solution of the present invention is further described in detail below with reference to the following detailed description and the accompanying drawings:
the straw used in the embodiment of the invention is rice straw, and is purchased from Mukang agriculture science and technology limited company in Fengrun areas in Tangshan.
Example 1:
preparation of modified straw:
pre-treating, washing and drying the straws, then crushing the straws, soaking the straws in deionized water, drying the straws, then sieving the straws with a 100-150-mesh sieve, steaming the straws with alkali liquor for 40min, and drying the straws to obtain straw powder;
performing graft modification, namely adding the pretreated straw powder and DMF (the adding amount is 1.08 percent of the mass of the straw powder) into a three-neck flask, performing ultrasonic treatment (40 kHz and 300W) for 30min, adding vidarabine monophosphate (the adding amount is 43.7 percent of the mass of the straw powder) and catalyst urea (the adding amount is 5.1 percent of the mass of the straw powder) under the stirring condition, and heating to 70 ℃ for reaction for 4 hours; cooling to room temperature, filtering and drying to obtain the modified straw.
Example 2:
the preparation of a modified straw differs from example 1 in that:
the adding amount of DMF is 0.92 percent of the mass of the straw powder; the addition amount of the vidarabine monophosphate is 42.8 percent of the mass of the straw powder; the adding amount of the urea is 4.7 percent of the mass of the straw powder.
Example 3:
the preparation of a modified straw differs from example 1 in that:
the adding amount of DMF is 1.23 percent of the mass of the straw powder; the addition amount of vidarabine monophosphate is 44.7 percent of the mass of the straw powder; the adding amount of the urea is 5.6 percent of the mass of the straw powder.
Example 4:
the preparation of a modified straw differs from example 1 in that:
in the straw pretreatment process, carbachol with the mass concentration of 1.1% is added into the alkaline solution.
Example 5:
the preparation of a modified straw differs from example 5 in that:
only the straw is pretreated.
Example 6:
preparing corrugated paper: adding the modified straw (36.7 percent of the corrugated paper pulp mass) prepared in the example 1 into the original corrugated paper pulp, then adding the modified straw into a beating tank for beating together, and then carrying out the production in the original production process to obtain corrugated paper; the grammage of the paper is 176g/m2。
Example 7:
corrugated paper was prepared as described in example 6, except that: modified straw was made as in example 2.
Example 8:
corrugated paper was prepared as described in example 6, except that: modified straw was made as in example 3.
Example 9:
corrugated paper was prepared as described in example 6, except that: modified straw was made as in example 4.
Example 10:
corrugated paper was prepared as described in example 6, except that: modified straw was made as in example 5.
Comparative example 1:
the preparation of a modified straw differs from example 1 in that: only the straw is pretreated.
Comparative example 2:
corrugated paper was prepared as described in example 6, except that: the modified straw was prepared in comparative example 1.
Comparative example 3:
the preparation of corrugated paper differed from comparative example 2 in that: modified straws are not added.
Test example 1:
1. IR analysis
Mixing the sample with KBr at a mass ratio of 100: 1 grinding uniformly, and measuring the infrared spectrum of the sample after die tabletting, wherein the wave number range is 4000cm-1~400cm-1。
The results of the above tests on unmodified straw and modified straw from example 1 are shown in FIG. 1. Analysis in the figure shows that the grain length is 3451cm compared with that of unmodified straw-1An O-H stretching vibration absorption peak is observed nearby, and the width of the absorption peak is obviously increased due to the fact that the vidarabine monophosphate contains a phosphate group and an amino group is also present in the structure of the vidarabine monophosphate; at 1641cm-1、1564cm-1、1529cm-1、1481cm-1Stretching vibration absorption of C = C, C = N bond having conjugate structure on purine ringA peak; at 1248cm-1A characteristic absorption peak of P = O appears nearby; 1180cm-1A characteristic absorption peak of C-N bond appears nearby; 997cm-1The vicinity is a characteristic absorption peak of P-OH; the successful preparation of modified straw in example 1 is demonstrated.
2. Determination of the graft ratio
The grafting rate of the modified straws is measured by adopting a weighing method, and the calculation formula is as follows:
graft ratio = (W)2－W1）/W1×100%
In the formula, W1The initial straw mass; w2Is the quality of the grafted straw.
The results of the above tests on the modified straws prepared in examples 1 to 4 are shown in Table 1:
TABLE 1 grafting Rate test results
| Sample(s) | Conversion rate/% |
| Example 1 | 19.2 |
| Example 2 | 18.9 |
| Example 3 | 19.7 |
| Example 4 | 24.6 |
The analysis in table 1 shows that the grafting ratio of the modified straw prepared in example 6 is significantly higher than that of example 1, which indicates that the regular arrangement of the original crystalline region of the straw is possibly disturbed to a certain extent by adding carbachol in the pretreated alkali liquor, the crystallinity is reduced, the structure is recombined, the grafting of vidarabine monophosphate is facilitated, and the grafting ratio of the modified straw is increased.
Test example 2:
1. burst strength test
And testing by using a burst strength tester. Cutting a sample, wherein the area of the sample must exceed the whole area of the upper chuck plate, and the front side and the back side are accurately indicated; the samples were then processed to equilibrium under standard atmospheric conditions of temperature and humidity, and the experiment was carried out under these conditions: determining a measurement range; clamping the sample, and placing the sample between an upper clamping ring and a lower clamping ring of the calibrated burst tester; testing, recording the numerical value of the pressure gauge, and pulling the pointer back to the zero point; the next sample was tested, at least 5 each on the front and back sides.
2. Tear Strength test
The tear strength test is carried out in accordance with GB/T455-2002 "determination of tear Strength of paper and cardboard".
The results of the above two tests on the corrugated papers prepared in comparative examples 2 to 3 and examples 6 to 10 were calculated as the increase in the burst strength and tear strength of other examples based on the corrugated paper prepared in comparative example 3, as shown in table 2:
TABLE 2 increase in burst strength and tear Strength
| Sample (I) | Increase in burst strength/%) | Increase in tear strength/%) |
| Comparative example 2 | 7.52 | 6.24 |
| Example 6 | 15.41 | 7.18 |
| Example 7 | 14.97 | 6.93 |
| Example 8 | 15.52 | 7.29 |
| Example 9 | 21.03 | 17.42 |
| Example 10 | 7.81 | 11.19 |
As can be seen from Table 2, the increase of the burst strength of the corrugated paper prepared in example 6 is obviously higher than that of comparative examples 2-3, but the increase of the tear strength is not obviously different from that of comparative example 2, which indicates that the burst strength of the corrugated paper can be obviously improved and the physical properties of the paper pulp can be improved by adding the vidarabine monophosphate modified straw into the corrugated paper pulp, and the tear strength is not negatively affected; the increase of the burst strength and the tear strength of the corrugated paper prepared in the example 9 are obviously higher than those of the corrugated paper prepared in the example 6, which shows that the improvement effect on the burst strength and the tear strength of the corrugated paper is obviously enhanced by adding the carbachol in the straw alkali liquor treatment process and compounding the carbachol with the vidarabine monophosphate for use. In addition, the increase of the bursting strength of the corrugated paper prepared in the example 10 is equivalent to that of the corrugated paper prepared in the comparative example 2, but the increase of the tearing strength is larger than that of the comparative example 2, which shows that the added carbachol can effectively enhance the tearing strength of the corrugated paper although the added carbachol does not have negative influence on the bursting strength of the corrugated paper in the straw alkali liquor treatment process.
3. Ring crush strength test
The test was carried out using a ring crush strength tester, model DCP-KY3000 (available from Szechwan Changjiang paper-making apparatus Co., Ltd.). The test method refers to the national standard GB/T2679.8-2016 determination of paper and paperboard ring crush strength.
4. Tensile Strength test
The test method refers to the national standard GB/T453-2002 for the determination of the tensile strength of G paper and paperboard (constant-speed loading method).
The results of the two tests on the corrugated papers prepared in comparative examples 2 to 3 and examples 6 to 10 are shown in Table 3:
table 3 results of performance testing
| Sample(s) | Ring crush index (N. m/g) | Tensile index (N m/g) |
| Comparative example 2 | 4.81 | 16.03 |
| Comparative example 3 | 3.57 | 13.45 |
| Example 6 | 6.92 | 20.48 |
| Example 7 | 6.73 | 20.12 |
| Example 8 | 7.01 | 21.02 |
| Example 9 | 8.74 | 25.19 |
| Example 10 | 4.92 | 16.23 |
As can be seen from Table 3, the ring crush index and the tensile index of the corrugated paper prepared in example 6 are both obviously higher than those of comparative examples 2-3, which shows that the ring crush strength and the tensile strength of the corrugated paper can be obviously improved and the physical properties of the paper pulp can be improved by adding the vidarabine monophosphate modified straw into the corrugated paper pulp; the ring crush index and the tensile index of the corrugated paper prepared in the example 9 are both obviously higher than those of the example 6, and the effect of the example 10 is equivalent to that of the comparative example 2, which shows that the ring crush index and the tensile index of the corrugated paper are not negatively influenced by adding the kappa-Bakelite in the straw alkali liquor treatment process; but the compound is used with vidarabine monophosphate in a compounding way, so that the ring crush strength and the tensile strength of the corrugated paper can be obviously enhanced, and the effect is better.
5. Buffer performance test
The cushioning property refers to the impact absorption capacity of the corrugated board when the corrugated board tray is impacted. In the dynamic of cushioning packaging, the static cushioning coefficient is adoptedCReflecting the shock absorption properties of the packaging material. The test is measured according to the national standard GB/T8168-2008 'static compression test method for buffer material for packaging', and static compression tests are carried out on the foot piers with different heights to obtain the testToF-x Curve (pressure-deflection curve), converting it intoσ-εCurve (stress-strain curve), damping factor of materialCIs maximum stressσ max And withu(energy absorbed per unit volume of corrugated board); the buffer efficiency was then measured (ref: science and technology report 2015, 33 (007): 61-66).
The results of the above tests on corrugated papers prepared in comparative examples 2 to 3 and examples 6 to 10 are shown in Table 4:
table 4 buffer performance test results
| Sample (I) | Buffer efficiency/%) |
| Comparative example 2 | 40.5 |
| Comparative example 3 | 32.4 |
| Example 6 | 51.9 |
| Example 7 | 50.8 |
| Example 8 | 51.5 |
| Example 9 | 62.2 |
| Example 10 | 46.7 |
As can be seen from Table 4, the buffering efficiency of the corrugated paper prepared in the example 6 is obviously higher than that of the corrugated paper prepared in the comparative examples 2-3, and the fact that the vidarabine monophosphate modified straw is added into the corrugated paper pulp can effectively enhance the buffering performance of the corrugated paper. The effect of the embodiment 9 is obviously better than that of the embodiment 6, and the effect of the embodiment 10 is better than that of the comparative example 2, which shows that the addition of the Kabacco in the straw alkali liquor treatment process has certain enhancement effect on the buffer performance of the corrugated paper; and the compound is compounded with vidarabine monophosphate for use, so that the effect of enhancing the buffering performance of corrugated paper is better.
6. Water resistance test
And spraying the test corrugated paper until the surface is wetted, placing the test corrugated paper in an environment with the humidity of 80%, standing for 10min, and measuring the tensile strength reduction rate of the sample board before and after treatment.
The results of the above tests on corrugated papers prepared in comparative examples 2 to 3 and examples 6 to 10 are shown in Table 5:
TABLE 5 Water resistance test results
| Sample (I) | Percent reduction in tensile strength/%) |
| Comparative example 2 | 40.1 |
| Comparative example 3 | 47.6 |
| Example 6 | 39.0 |
| Practice ofExample 7 | 39.5 |
| Example 8 | 39.7 |
| Example 9 | 21.3 |
| Example 10 | 36.4 |
As can be seen from table 5, the tensile strength reduction rate of the corrugated paper prepared in example 6 is equivalent to that of comparative example 2, the effect of example 9 is obviously better than that of example 6, and the effect of example 10 is slightly better than that of comparative example 2, which indicates that the addition of vidarabine monophosphate modified straw to the corrugated paper pulp does not negatively affect the water resistance of the corrugated paper; the carbachol is added in the straw alkali liquor treatment process to cause the change of the straw structure, and the carbachol has a certain enhancement effect on the water resistance of the corrugated paper; and the water-resistant performance of the corrugated paper is obviously improved by compounding the paper with vidarabine monophosphate.
Conventional techniques in the above embodiments are known to those skilled in the art, and therefore, will not be described in detail herein.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A modified straw is characterized in that: the modified straw is vidarabine monophosphate grafted modified straw, and the preparation method comprises the following steps:
pre-treating, washing and drying the straws, then crushing the straws, soaking the straws in deionized water, drying the straws, then sieving the straws with a 100-150-mesh sieve, stewing the straws with alkali liquor, and drying the straws to obtain straw powder;
carrying out graft modification, mixing the pretreated straw powder with DMF (dimethyl formamide), carrying out ultrasonic treatment, adding vidarabine monophosphate and catalyst urea under the stirring condition, heating to 60-80 ℃, and reacting for 3-5.5 h; cooling to room temperature, filtering and drying to obtain modified straws;
the grafting rate of the modified straw is more than or equal to 18 percent.
2. The modified straw as claimed in claim 1, wherein: the straw is one or more of straw stalk, wheat straw stalk, cotton stalk, corn stalk, soybean stalk and sorghum stalk.
3. The modified straw as claimed in claim 1, wherein: the adding amount of DMF in the graft modification is 0.8-1.3% of the straw powder; the addition amount of vidarabine monophosphate is 40-46% of the mass of the straw powder; the adding amount of the urea is 4.5-6.6% of the mass of the straw powder.
4. The modified straw as claimed in claim 1, wherein: adding carbachol with the mass concentration of 0.9-1.2% into the pretreated alkali liquor.
5. The modified straw as claimed in claim 4, wherein: the application of the carbachol in improving the grafting rate of the modified straw.
6. Use of the modified straw of any one of claims 1 to 5 in the preparation of corrugated paper.
7. Use according to claim 6, characterized in that: the preparation of corrugated paper comprises the following steps: adding the modified straws into corrugated paper pulp according to a proportion to produce corrugated paper; wherein the adding amount of the modified straws is 23-46% of the mass of the corrugated paper pulp.
8. Use according to claim 6, characterized in that: the modified straw is used for enhancing the burst strength, tensile strength, ring crush strength and buffering performance of corrugated paper.
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