CN103044558B - A kind of High-film-forming-prhigh-performance high-performance cationic graft starch - Google Patents

Abstract

The invention discloses a cationic grafted high-performance starch with high film-forming property. It is formed by mixed etherification grafting reaction, wherein the mass content of each raw material is 80-95% of corn starch, 1-10% of 3-chloro-2-hydroxypropyltrimethylammonium chloride, 1-6% of povidone %, persulfate 0.1~12%. The high-film-forming cationic grafted high-performance starch is environmentally friendly, has good anti-aging properties, stable slurry viscosity, strong adhesion to cotton and polyester, and fatigue resistance. The slurry has good film-forming properties and is easy to desizing. Slurry wastewater is easy to handle, easy to biodegrade, has little environmental pollution, and has zero pollution discharge in the production process.

Description

A high-film-forming cationic grafted high-performance starch

technical field

The invention belongs to the field of textile industry, and in particular relates to a high-film-forming cationic grafted high-performance starch in the yarn sizing process of the textile industry.

Background technique

In the yarn sizing process in the textile industry, because polyvinyl alcohol (PVA) size has excellent film-forming properties, adhesion and better compatibility with other sizes, it is considered to solve the problem of polyester-cotton blending. The most ideal size for spinning and pure cotton fine size, high density and high difficulty varieties. However, since the price of polyvinyl alcohol (PVA) sizing is much higher than that of starch sizing, coupled with polyvinyl alcohol (PVA) sizing and some refractory sizing, it is difficult to treat the sizing wastewater after desizing, causing environmental pollution. pollute. The damage to the environment and pollution problems have attracted widespread attention, especially the fabrics sized with polyvinyl alcohol (PVA) sizing have been limited in export products, so less or no polyvinyl alcohol (PVA) sizing is used for warp sizing , has become an urgent problem to be solved. Some non-polyvinyl alcohol cationic pastes are also disclosed in the prior art, but in the field of high quality and special applications, the existing pastes still have deficiencies in high film-forming properties, fatigue resistance, and high film-forming properties. Seriously restrict the scope of application of non-polyvinyl alcohol slurry.

Contents of the invention

The purpose of the present invention is to provide a low-cost, high-performance cationic grafted high-performance starch with low or no use of PVA on the basis of the prior art.

Another object of the present invention is to provide a method for preparing and using the above-mentioned high-film-forming cationic grafted high-performance starch.

The purpose of the present invention can be achieved through the following measures:

A high-film-forming cationic grafted high-performance starch, the slurry is etherified by dry mixing raw corn starch, 3-chloro-2-hydroxypropyltrimethylammonium chloride, povidone and persulfate It is formed by grafting reaction, and the mass content of each raw material is 80-95% of corn starch, 1-10% of 3-chloro-2-hydroxypropyltrimethylammonium chloride, 1-6% of povidone, persulfuric acid Salt 0.1~12%. (the sum of each raw material is 100%)

In a preferred scheme, the mass content of each raw material is: 80-90% of cornstarch, 2-8% of 3-chloro-2-hydroxypropyltrimethylammonium chloride, 1-6% of povidone, and Sulfate 1-8%. (the sum of each raw material is 100%)

In the dry mixing etherification grafting reaction of each raw material, the temperature is preferably 60°C-75°C, more preferably 65-70°C, and most preferably around 68°C. The reaction time of dry mixed etherification grafting can be adjusted according to the actual situation, generally it can be 30min~60min.

The persulfate in the present invention is selected from one or more of calcium persulfate, potassium hydrogen persulfate and ammonium persulfate.

In the slurry of the present invention, 3-chloro-2-hydroxypropyltrimethylammonium chloride, povidone and persulfate are embedded by a microcapsule embedding method through a preliminary mixing reaction. The method of embedding components and fully reacting before use is extremely beneficial to the production, circulation, storage and use of slurry.

The invention discloses a method for using the high-film-forming cation-grafted high-performance starch: before using the high-film-forming cation-grafted high-performance starch, add water and raise the temperature to 95°C to 130°C for heat preservation reaction. After the reaction, an emulsion for fabric sizing is obtained;

Among them, 3-chloro-2-hydroxypropyltrimethylammonium chloride, povidone and persulfate cooperate with corn starch to undergo thermal insulation chemical reactions, which include etherification, grafting, oxidation compound reactions, etc., such as 3- Chloro-2-hydroxypropyltrimethylammonium chloride and corn starch undergo etherification grafting reaction under the promotion of temperature and povidone and persulfate, and persulfate and corn starch undergo oxidation reaction.

In the insulation reaction before use, the ratio of high film-forming cationic grafted high-performance starch to water is determined according to the solid content applicable to production. The mass ratio of high film-forming cationic grafted high-performance starch to water is generally 10-20: 80-90, preferably 8-16: 84-92, more preferably 9-14: 86-91. The heat preservation reaction is generally carried out under stirring, and the time of the heat preservation reaction is preferably 20-50 minutes, more preferably 25-45 minutes.

The present invention also includes a preparation method of high-film-forming cationic grafted high-performance starch, wherein raw material cornstarch, 3-chloro-2-hydroxypropyltrimethylammonium chloride, povidone and persulfate are dried It is obtained by mixed etherification grafting reaction, wherein the mass content of each raw material is 80-95% of corn starch, 1-10% of 3-chloro-2-hydroxypropyltrimethylammonium chloride, 1-6% of povidone %, persulfate 0.1~12%. Wherein each general or preferred condition is as above.

The cationic grafted high-performance starch with high film-forming property of the invention has strong adhesion, good film-forming property, strong and tough serous film, good elasticity, wear resistance and the like. When sizing pure cotton yarns for textiles, polyvinyl alcohol (PVA) may not be used for general tightness varieties below 80 counts, and polyethylene may not be used or used less for sizing cotton or pure cotton yarns above 80 counts. Alcohol (PVA). It further has the following properties:

The high-film-forming cationic grafted high-performance starch is environmentally friendly and does not contain polyvinyl alcohol (PVA) and other biodegradable substances. It has good high film-forming performance, stable slurry viscosity, and is suitable for cotton and polyester. It has strong adhesion (tested by slurry adhesion, the adhesion of pure cotton is above 101.26N, and the adhesion of polyester and cotton is above 145.10N), anti-fatigue, good slurry film-forming property, easy to desizing, slurry Wastewater is easy to treat and biodegradable (using The biodegradation test is carried out according to the standard, the same below, and the result reaches level 9), which has little pollution to the environment and has zero pollution discharge during the production process.

Detailed ways

Example 1

Put 83kg of corn starch, 6kg of 3-chloro-2-hydroxypropyltrimethylammonium chloride, 6kg of povidone, and 5kg of calcium persulfate into the reaction tank respectively, and dry-mix ether at 68°C The chemical grafting reaction was terminated after 45 minutes, and the material was unloaded, packaged, and put into storage. When the customer is using it, add 800kg of clear water to gelatinize and heat up to 95°C or add clear water in a high-pressure tank to heat up to 125°C and keep it warm for 30-45min to carry out etherification and oxidation compound reactions to prepare the emulsion for fabric sizing.

After the slurry adhesion test, the pure cotton adhesion is 112N, and the polyester-cotton adhesion is 156N. Carry out the same adhesion test to the slurry prepared in Example 1 in CN102733190A, CN102733191A, and CN102605618A respectively, wherein CN102733190A pure cotton adhesion is 91N, polyester cotton adhesion is 115N; CN102733191A pure cotton adhesion is 93N , polyester-cotton adhesion is 119N; CN102605618A pure cotton adhesion is 66N, polyester-cotton adhesion is 97N. Its biodegradation test grade 9.

The toughness and wear resistance tests were carried out on the serous film obtained by compounding this product with the auxiliary materials in test 1. The abrasion resistance of this product was 1.22 mg/cm ² , and that of polyvinyl alcohol (PVA) was 1.18 mg/cm ² ; the serous film of this product Elongation at break: 3.69%. The slurries prepared in Example 1 in CN102733190A, CN102733191A, and CN102605618A were respectively used for comparative experiments under the same conditions. CN102733190A had an abrasion of 1.65 mg/cm ² , CN102733191A had an abrasion of 1.92 mg/cm ² , and CN102605618A had an abrasion of 1.84 mg/cm ² .

Example 2

Put 85kg of cornstarch, 6kg of 3-chloro-2-hydroxypropyltrimethylammonium chloride, 4kg of povidone, and 5kg of potassium hydrogen persulfate into the reaction tank respectively, and dry mix them at a temperature of 68°C After 45 minutes of etherification and grafting reaction, the reaction was terminated, and the materials were unloaded, packaged, and put into storage. When the customer is using it, add 700kg of water to gelatinize and heat up to 95°C or add water in a high-pressure tank to heat up to 125°C and keep it warm for 30-45min to carry out etherification and oxidation compound reactions to obtain a fabric sizing emulsion. After the slurry adhesion test, the pure cotton adhesion is 104N, and the polyester-cotton adhesion is 147N. Its biodegradation test grade 9. The toughness and abrasion resistance tests were carried out on the serous film obtained by compounding this product with the auxiliary material of test 1. The abrasion resistance of this product was 1.26mg/cm ² .

Example 3

Put 90kg of cornstarch, 4kg of 3-chloro-2-hydroxypropyltrimethylammonium chloride, 3kg of povidone, and 3kg of ammonium persulfate into the reaction tank respectively, and carry out compound mixing reaction at 68°C for 45min Finally, the reaction is terminated, unloaded, packaged, and put into storage. When the customer is using it, add 680kg of water to gelatinize and heat up to 95°C or add water in a high-pressure tank to heat up to 125°C and keep it warm for 30-45min to carry out etherification and oxidation compound reactions to obtain fabric sizing emulsion. After the slurry adhesion test, the pure cotton adhesion is 108N, and the polyester-cotton adhesion is 155N. Its biodegradation test grade 9. The toughness and abrasion resistance tests were carried out on the serous film obtained by compounding this product with the auxiliary material of test 1. The abrasion resistance of this product was 1.30 mg/cm ² .

All or part of the emulsion size obtained in the above examples is used to replace the polyvinyl alcohol, high-performance starch and ordinary starch in the existing size formula, and the fabric is sized in actual production, and the existing formula is used for comparative experiments . The formulations and production conditions of each group are shown in the table below.

test one

Variety: 65"JC100 ^S × JC100 ^S /2/216 × 125 size

Sizing process

1. Selected models:

Seven units of Toyota double pulp tank, adopting "single immersion double pressure" process

2. Sizing process:

Speed: 50M/min

Slurry tank temperature: 95°C

Viscosity of stock tank: front/back 8.7/8.5 ^S

Cylinder temperature: pre/combined 108/93°C

Grouting force: Ⅰ speed 16KN Ⅱ speed 24KN

Unwinding tension: 0.06mpa

Tension of stock tank: Ⅰ speed 0.3% Ⅱ speed 0.2%

Wet area traction: I speed 0.4% II speed 0.3%

Tension in dry area: 0.2% for Ⅰ speed and 0.1% for Ⅱ speed

Coiling tension: 1700N

Resurgence display: 7.5%

Desizing rate: 13.7%

3. Weaving condition

project original recipe Example 1 loom model toyota 710 toyota 710 Loom speed (r/min) 550 550 Loom Efficiency (%) 77.8 90.8 Stops (times/shift) 10.0 8.2 Weft stop (times/shift) 35.4 20.1 Shed status not very clear clear

Test two:

Variety: 63"T/C65/3545 ^S × 45 ^S /133 × 721/1 size

Claims (7)

1. A high-film-forming cationic grafted high-performance starch is characterized in that raw material cornstarch, 3-chloro-2-hydroxypropyltrimethylammonium chloride, povidone and persulfate are mixed by dry process It is formed by etherification grafting reaction, the mixing reaction temperature is 60℃～75℃, and the mixing reaction time is 30min～60min; the mass content of each raw material is 80～95% of corn starch, 3-chloro-2-hydroxypropyl tri Methyl ammonium chloride 1-10%, povidone 1-6%, persulfate 0.1-12%. 2. The high-film-forming cationic grafted high-performance starch according to claim 1 is characterized in that the mass content of each raw material is cornstarch 80～90%, 3-chloro-2-hydroxypropyl trimethyl chloride Ammonium 2-8%, povidone 1-6%, persulfate 1-8%. 3. The high-film-forming cationic grafted high-performance starch according to claim 1, characterized in that the mixing reaction temperature of each raw material is 65°C-75°C. 4. according to claim 1 and 2 described high-film-forming cationic grafting high-performance starches, it is characterized in that said persulfate is selected from one or more of calcium persulfate, potassium persulfate, ammonium persulfate kind. 5. A method for using the high-film-forming cationic grafted high-performance starch according to claim 1, characterized in that before using the high-film-forming cationic grafted high-performance starch, water is added and the temperature is raised to 95° C. Heat preservation reaction at 130°C, and after the reaction, an emulsion for sizing fabrics is obtained; The high-film-forming cationic grafted high-performance starch is made from cornstarch, 3-chloro-2-hydroxypropyltrimethylammonium chloride, povidone and persulfate through dry mixing etherification grafting reaction, The mixing reaction temperature is 60℃～75℃, and the mixing reaction time is 30min～60min; the mass content of each raw material is 80～95% of corn starch, 1～10% of 3-chloro-2-hydroxypropyltrimethylammonium chloride %, povidone 1-6%, persulfate 0.1-12%. 6. The method according to claim 5, characterized in that the mass ratio of the high-film-forming cationic grafted high-performance starch to water is 10-20:80-90; the time for the heat preservation reaction before use is 20-20. 50min. 7. A preparation method of high-film-forming cationic grafted high-performance starch is characterized in that raw cornstarch, 3-chloro-2-hydroxypropyltrimethylammonium chloride, povidone and persulfate are passed through It is obtained by dry mixing etherification grafting reaction, the mixing reaction temperature is 60℃～75℃, and the mixing reaction time is 30min～60min; the mass content of each raw material is 80～95% of corn starch, 3-chloro-2-hydroxy Propyltrimethylammonium chloride 1-10%, povidone 1-6%, persulfate 0.1-12%.