CN112980382A - Reactive polyurethane hot melt adhesive and preparation method thereof - Google Patents
Reactive polyurethane hot melt adhesive and preparation method thereof Download PDFInfo
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
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- C08G18/4266—Polycondensates having carboxylic or carbonic ester groups in the main chain prepared from hydroxycarboxylic acids and/or lactones
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Abstract
The application relates to the field of hot melt adhesives, and particularly discloses a reactive polyurethane hot melt adhesive and a preparation method thereof. The reactive polyurethane hot melt adhesive comprises polymethylene polyphenyl polyisocyanate, a polyol solution and modified acrylate, wherein the modified acrylate comprises the following components: acrylate, polyvinyl alcohol, water; the preparation method comprises the steps of blending the polyalcohol solution and the modified acrylate, dehydrating at the temperature of 100-150 ℃ in a vacuum state, stopping heating to obtain a mixed solution A, adding the polymethylene polyphenyl polyisocyanate into the mixed solution A, stirring, controlling the solution temperature at 70-100 ℃ and reacting for 0.5-2 h; the polyurethane hot melt adhesive in this application has the open time and the curing time who shorten the hot melt adhesive, can also strengthen the degradable effect of hot melt adhesive.
Description
Technical Field
The application relates to the technical field of hot melt adhesives, in particular to a reactive polyurethane hot melt adhesive and a preparation method thereof.
Background
The reactive polyurethane hot melt adhesive (PUR) has the characteristics of high initial viscosity, high positioning speed and the like of the hot melt adhesive, has the characteristics of water resistance, chemical resistance, creep resistance and the like of the reactive adhesive, and also has the characteristics of simple operation, excellent performance and environmental friendliness, so that the reactive polyurethane hot melt adhesive is widely applied to industries such as automobile industry, shoe manufacturing industry, textile industry, wood industry, electronic industry, white household appliances, book binding, food packaging and the like.
At present, the opening time and the curing time of the polyurethane hot melt adhesive are longer, so that the speed of production equipment in an assembly line type in the industries of automobiles, textiles and the like needs to be reduced to adapt to the opening time and the curing time of the reactive polyurethane hot melt adhesive, and the production efficiency of the production equipment is reduced.
The open time of the reactive polyurethane hot melt adhesive generally refers to the maximum time interval from coating of the polyurethane hot melt adhesive until the surface of the polyurethane hot melt adhesive can still be adhered to a substrate, and the hot melt adhesive has a good adhesion effect in the open time. The curing time of the reactive polyurethane hot melt adhesive generally refers to the shortest time from when the hot melt adhesive is pressed between two substrates until the two substrates form a firm adhesion.
Disclosure of Invention
In order to shorten the opening time and the curing time of the polyurethane hot melt adhesive so as to improve the production efficiency of industries such as automobiles, the application provides the reactive polyurethane hot melt adhesive and the preparation method thereof.
The application provides a reaction type polyurethane hot melt adhesive, adopts following technical scheme:
a reactive polyurethane hot melt adhesive mainly comprises the following components in parts by weight: 30-45 parts of polymethylene polyphenyl polyisocyanate, 10-15 parts of polyalcohol solution and 20-35 parts of modified acrylic ester, wherein the modified acrylic ester comprises the following components in parts by weight: 25-40 parts of acrylate, 10-25 parts of polyvinyl alcohol and 35-55 parts of water.
By adopting the technical scheme, the polyurethane hot melt adhesive prepared from the raw materials in a specific range has the advantages of short opening time and curing time, high bonding strength, hydrolysis resistance and the like; the modified acrylate is prepared from acrylate and polyvinyl alcohol, and the modified acrylate can improve the curing speed of the polyurethane hot melt adhesive, so that the production speed of industries such as automobiles, textiles and the like is improved, the polyurethane hot melt adhesive can have degradable performance, and the degradable environment-friendly polyurethane hot melt adhesive can be widely used in multiple industries.
Preferably, the modified acrylate comprises the following components in parts by weight: 30-40 parts of acrylic ester, 10-20 parts of polyvinyl alcohol and 40-50 parts of water.
By adopting the technical scheme, the modified acrylate is adopted, so that the opening time and the curing time of the polyurethane hot melt adhesive are favorably shortened; the cost of the polyvinyl alcohol is low, so that the cost of the polyurethane hot melt adhesive can be reduced, and the degradability of the polyurethane hot melt adhesive can be improved.
Preferably, the polyol solution is one or a combination of two of polypropylene glycol and polycaprolactone glycol, the molecular weight of the polypropylene glycol is 1000-3000, and the molecular weight of the polycaprolactone glycol is 1000-2000.
By adopting the technical scheme, the polyurethane hot melt adhesive prepared from the polypropylene glycol has the advantages of excellent water resistance, good low temperature resistance and high final adhesion strength; the polyurethane hot melt adhesive prepared from the polycaprolactone diol has the effects of high adhesive strength, good heat resistance and good oil resistance, and the polypropylene glycol and the polycaprolactone diol are compounded for use, so that the advantages of the polypropylene glycol and the polycaprolactone diol can be achieved, and the opening time and the curing time of the polyurethane hot melt adhesive can be shortened.
Preferably, the polyol solution is a composition of polypropylene glycol and polycaprolactone glycol, and the weight of the polycaprolactone glycol accounts for 50-85% of the weight of the polyol solution.
By adopting the technical scheme, when the weight percentage of the polycaprolactone diol in the polyol solution is lower than 50%, the bonding strength of the hot melt adhesive can be improved, but the initial adhesion strength of the hot melt adhesive is lower, and the proportion of the polycaprolactone diol in the polyol solution is improved, so that when the weight percentage of the polycaprolactone diol in the polyol solution is within a preset range, the bonding strength of the hot melt adhesive can be improved, and meanwhile, the opening time and the curing time can be shortened.
Preferably, the catalyst also comprises 0.5 to 1 part by weight of catalyst.
By adopting the technical scheme, the catalyst can improve the synthesis reaction speed of the polyurethane hot melt adhesive, thereby improving the production efficiency of the polyurethane hot melt adhesive, reducing the production cost of the polyurethane hot melt adhesive, improving the opening time and the curing speed of the hot melt adhesive, improving the production speed of products in industries such as automobiles, textiles and the like, and accelerating the operation of a production line.
Preferably, the catalyst is selected from one or a combination of two of dibutyltin dilaurate and dimorpholinyl diethyl ether.
By adopting the technical scheme, the opening time and the curing time of the hot melt adhesive can be shortened by the dimorpholinyl diethyl ether, and the final adhesive strength and the initial adhesive strength of the hot melt adhesive can be improved by the dibutyltin dilaurate.
Preferably, the preparation method of the modified acrylate is as follows: stirring the polyvinyl alcohol, the acrylic ester and the water for 10-30min at the stirring speed of 80-100rpm to obtain the modified acrylic ester.
By adopting the technical scheme, the polyvinyl alcohol and the acrylic ester are dissolved in water, and the acrylic ester and the polyvinyl alcohol can be fully mixed and dispersed by stirring, so that the modified acrylic ester possibly has higher glass transition temperature, and the polyurethane hot melt adhesive can accelerate curing and increase initial adhesion strength after sizing.
Preferably, the preparation method of the modified acrylate is as follows: and magnetically stirring the polyvinyl alcohol, the acrylic ester and water for 1-2 hours at the temperature of 80-100 ℃ to obtain the modified acrylic ester.
By adopting the technical scheme, the polyvinyl alcohol and the acrylic ester are subjected to special treatment to prepare the modified acrylic ester, and the modified acrylic ester can be a polymer with high glass transition temperature and high crystallinity, so that the polyurethane hot melt adhesive prepared from the modified acrylic ester can shorten the opening time and the curing time, enhance the initial adhesion strength and improve the degradability of the polyurethane hot melt adhesive.
In a second aspect, the application provides a method for manufacturing a reactive polyurethane hot melt adhesive, which adopts the following technical scheme:
a preparation method of a reactive polyurethane hot melt adhesive comprises the following steps:
(1) according to the weight portion, the polyalcohol solution and the modified acrylic ester are blended, the dehydration is carried out for 1.5 to 3 hours under the conditions that the temperature is 100 ℃ and 150 ℃ and the absolute vacuum degree is 0.080 to 0.12MPa, and the heating is stopped to obtain a mixed solution A;
(2) and (2) adding polymethylene polyphenyl polyisocyanate into the mixed solution A according to the weight part, stirring, and controlling the system temperature to be 70-100 ℃ and the reaction time to be 0.5-2h to obtain the reactive polyurethane hot melt adhesive.
Through adopting above-mentioned technical scheme, improve the temperature of mixed liquid A for mixed liquid A's moisture vaporization, then through the mode of evacuation with steam discharge mixed liquid A, thereby can reduce mixed liquid A's water content, wherein, the water and the many methylene polyphenyl isocyanate in the mixed liquid A take place to react, generate unstable carbamic acid, and the unstable volume of carbamic acid is easily decomposed into amine and carbon dioxide, thereby reduces the bonding strength of polyurethane hot melt adhesive.
Preferably, the absolute vacuum degree is 0.090-0.010 MPa.
By adopting the technical scheme, the smaller the absolute vacuum degree is, the thinner the air is, and the less the moisture in the mixed liquid A is, so that the final adhesive strength and the initial adhesive strength of the polyurethane hot melt adhesive can be improved.
In summary, the invention includes at least one of the following beneficial technical effects:
1. due to the adoption of the polyol component, the heat resistance and hydrolysis resistance of the polyurethane hot melt adhesive are improved, and the condition that the bonding strength of the hot melt adhesive is low under the condition of humidity and high temperature is reduced; moreover, the modified acrylate is adopted to prepare the hot melt adhesive, so that the opening time of the hot melt adhesive can be shortened, the curing speed can be improved, and the degradability of the hot melt adhesive can be enhanced; in addition, the catalyst can improve the synthesis speed of the hot melt adhesive so as to reduce the production cost of enterprises;
2. according to the preparation method, the acrylic ester is preferably modified by adopting the polyvinyl alcohol, compared with the method of independently adding the acrylic ester, the cost of raw materials can be reduced, and the modified acrylic ester has degradable performance, so that the prepared hot melt adhesive can achieve the effects of environmental protection and no harm to the environment;
3. in the preparation process of the polyurethane hot melt adhesive, the solution temperature of the mixed solution A can vaporize the moisture in the mixed solution A, then the moisture in the mixed solution A is effectively removed under the vacuum state, and the bonding strength and the initial bonding strength of the polyurethane hot melt adhesive can be improved.
Detailed Description
The present application will be described in further detail with reference to examples.
Table 1 shows the sources of commercially available raw materials used in the examples and comparative examples of the present application.
Table 1.
| Item | Model number | Manufacturer of the product |
| Polymethylene polyphenyl polyisocyanates | P304914 | SHANGHAI ALADDIN BIOCHEMICAL TECHNOLOGY Co.,Ltd. |
| Molecular weight of polypropylene glycol 3000g/mol | P103211 | SHANGHAI ALADDIN BIOCHEMICAL TECHNOLOGY Co.,Ltd. |
| Polypropylene glycol molecular weight 1000g/mol | P103210 | SHANGHAI ALADDIN BIOCHEMICAL TECHNOLOGY Co.,Ltd. |
| Molecular weight of polypropylene glycol 400g/mol | P103209 | SHANGHAI ALADDIN BIOCHEMICAL TECHNOLOGY Co.,Ltd. |
| Polycaprolactone diol molecular weight 2000g/mol | Polycaprolactone diol 2204 | Wuhan Haishan science and technology Co., Ltd |
| Polycaprolactone diol molecular weight 1000g/mol | Polycaprolactone diol 2104 | Wuhan Haishan science and technology Co., Ltd |
| Polycaprolactone diol molecular weight 500g/mol | Polycaprolactone diol 2055 | Wuhan Haishan science and technology Co., Ltd |
| Acrylic esters | Carbomer resin | GUANGZHOU DX CHEMICAL Co.,Ltd. |
| Polyvinyl alcohol | P105124 | SHANGHAI ALADDIN BIOCHEMICAL TECHNOLOGY Co.,Ltd. |
| Dibutyl tin dilaurate | D100274 | Shanghai aladingBiochemical science and technology Ltd |
| Dimorpholinyl diethyl ether | / | Bright and practical Co Ltd of Shanghai |
Examples
Example 1:
a reactive polyurethane hot melt adhesive is prepared by the following method:
(1) preparing materials: weighing 30kg of polymethylene polyphenyl polyisocyanate, 10kg of 400g/mol polypropylene glycol, 25kg of acrylic ester, 10kg of polyvinyl alcohol and 35kg of water according to parts by weight;
(2) stirring polyvinyl alcohol, acrylic ester and water for 10min at the stirring speed of 80rpm to prepare modified acrylic ester;
(3) mixing the polyalcohol solution and the modified acrylate, dehydrating for 1.5h at 100 ℃ and under the absolute vacuum degree of 0.080MPa, and stopping heating to obtain a mixed solution A;
(4) and adding polymethylene polyphenyl polyisocyanate into the mixed solution A, stirring, controlling the temperature of the solution at 70 ℃, and reacting for 0.5h to obtain the reactive polyurethane hot melt adhesive.
Example 2:
a reactive polyurethane hot melt adhesive is prepared by the following method:
(1) preparing materials: weighing 37kg of polymethylene polyphenyl polyisocyanate, 12kg of 500g/mol polycaprolactone diol, 32kg of acrylate, 17kg of polyvinyl alcohol and 45kg of water according to parts by weight;
(2) stirring polyvinyl alcohol, acrylic ester and water for 20min at the stirring speed of 90rpm to prepare modified acrylic ester;
(3) blending the polyalcohol solution and the modified acrylate, dehydrating for 2.25h at the temperature of 100-150 ℃ and the absolute vacuum degree of 0.010MPa, and stopping heating to obtain a mixed solution A;
(4) and adding polymethylene polyphenyl polyisocyanate into the mixed solution A, stirring, controlling the temperature of the solution at 85 ℃, and reacting for 1.25h to obtain the reactive polyurethane hot melt adhesive.
Example 3:
a reactive polyurethane hot melt adhesive is prepared by the following method:
(1) preparing materials: according to the parts by weight, 45kg of polymethylene polyphenyl polyisocyanate, 3.75kg of 400g/mol polypropylene glycol, 11.25 kg of 500g/mol polycaprolactone diol, 40kg of acrylic ester, 25kg of polyvinyl alcohol and 55kg of water are weighed;
(2) stirring polyvinyl alcohol, acrylic ester and water for 30min at the stirring speed of 100rpm to prepare modified acrylic ester;
(3) mixing the polyalcohol solution and the modified acrylate, dehydrating for 3h at the temperature of 150 ℃ and the absolute vacuum degree of 0.12MPa, and stopping heating to obtain a mixed solution A;
(4) and adding polymethylene polyphenyl polyisocyanate into the mixed solution A, stirring, controlling the temperature of the solution at 100 ℃, and reacting for 2 hours to obtain the reactive polyurethane hot melt adhesive.
Example 4:
a reactive polyurethane hot melt adhesive, which is different from the one in example 3 in that: the weight of acrylic ester was 30kg, the weight of polyvinyl alcohol was 10kg, and the weight of water was 40 kg.
Example 5:
a reactive polyurethane hot melt adhesive, which is different from the one in example 3 in that: the weight of the acrylic ester was 40kg, the weight of the polyvinyl alcohol was 20kg, and the weight of the water was 50 kg.
Example 6:
a reactive polyurethane hot melt adhesive, which is different from the one in example 5 in that: the molecular weight of polypropylene glycol is 1000 and the molecular weight of polycaprolactone diol is 1000.
Example 7:
a reactive polyurethane hot melt adhesive, which is different from the one in example 5 in that: the molecular weight of polypropylene glycol is 3000 and the molecular weight of polycaprolactone diol is 2000.
Example 8:
a reactive polyurethane hot melt adhesive, which is different from the one prepared in example 7 in that: the weight of polypropylene glycol was 7.5kg and the weight of polycaprolactone diol was 7.5 kg.
Example 9:
a reactive polyurethane hot melt adhesive, which is different from the one prepared in example 7 in that: the weight of polypropylene glycol was 2.25kg and the weight of polycaprolactone diol was 12.75 kg.
Example 10:
a reactive polyurethane hot melt adhesive, which is different from the one in example 9 in that:
(3) and (3) mixing the polyalcohol solution, the modified acrylate and 0.5kg of dibutyltin dilaurate, dehydrating for 3h at the temperature of 150 ℃ and the absolute vacuum degree of 0.12MPa, and stopping heating to obtain a mixed solution A.
Example 11:
a reactive polyurethane hot melt adhesive, which is different from the one in example 9 in that:
(3) and (2) mixing the polyalcohol solution, the modified acrylate and 1kg of dimorpholinyl diethyl ether, dehydrating for 3 hours at the temperature of 150 ℃ and the absolute vacuum degree of 0.12MPa, and stopping heating to obtain a mixed solution A.
Example 12:
a reactive polyurethane hot melt adhesive, which is different from the one in example 9 in that:
(3) mixing polyalcohol solution, modified acrylate, 0.5kg of dimorpholinyl diethyl ether and 0.5kg of dibutyltin dilaurate, dehydrating for 3h at the temperature of 150 ℃ and the absolute vacuum degree of 0.12MPa, and stopping heating to obtain a mixed solution A.
Example 13:
a reactive polyurethane hot melt adhesive, which is different from the one prepared in example 12 in that:
(2) and magnetically stirring the polyvinyl alcohol, the acrylic ester and water for 1h at the stirring speed of 100rpm and the temperature of 80 ℃ to obtain the modified acrylic ester.
Example 14:
a reaction type polyurethane hot melt adhesive is different from the embodiment in that:
(2) and magnetically stirring the polyvinyl alcohol, the acrylic ester and water for 2 hours at the stirring speed of 100rpm and the temperature of 100 ℃ to obtain the modified acrylic ester.
Example 15:
a reactive polyurethane hot melt adhesive, which is different from the one prepared in example 14 in that: the absolute vacuum degree was 0.090 MPa.
Example 16:
a reactive polyurethane hot melt adhesive, which is different from the one prepared in example 14 in that: the absolute vacuum degree is 0.10 MPa.
Comparative example
Comparative example 1:
a reactive polyurethane hot melt adhesive, which is different from the one in example 3 in that: equivalent amount of polyvinyl alcohol was replaced by water.
Performance test
Weight loss rate: coating a polyurethane hot melt adhesive on a glass substrate, placing the glass substrate on a pressing device after 5min, applying pressure of 0.3-0.5MPa for pressing for 3s, placing the glass substrate for 10min, burying the soil for 7d, and detecting the disintegration degree in GB/T19811-;
final bond strength test: coating the polyurethane hot melt adhesive on a base material, placing the base material on a pressing device after 5min, applying pressure of 0.3-0.5MPa for pressing for 3s, placing the base material for 10min, and testing the polyurethane hot melt adhesive embodiment and the comparative example by adopting an electronic tensile machine according to the standard of the GB/T39289 2020 adhesive bonding strength measuring method;
opening time: the polyurethane hot melt adhesive examples were tested against the comparative examples according to the HG/T3716-2003 hot melt adhesive open time determination criteria.
Curing time: according to the GB/T14074-2017 wood adhesive and the standard for measuring the 3.7 curing time in the numerical detection method thereof, the polyurethane hot melt adhesive embodiment and the comparative example are tested;
initial adhesion strength: coating the polyurethane hot melt adhesive on a base material, placing the base material on a pressing device after 5min, applying pressure of 0.3-0.5MPa for pressing for 3s, and detecting the bonding strength of the embodiment and the comparative example of the polyurethane hot melt adhesive by using an electronic tension machine according to the standard of a method for determining the bonding strength of an adhesive GB/T39289-2020;
the results are shown in table 2 below:
TABLE 2 Table of Performance data for examples 1-16 and comparative example 1
| Sample (I) | Open time(s) | Curing time(s) | Weight loss ratio (%) | Adhesive Strength (MPa) | Initial adhesion Strength (MPa) |
| Example 1 | 200 | 257 | 71.6% | 8.27 | 1.10 |
| Example 2 | 189 | 250 | 72.5% | 8.31 | 1.12 |
| Example 3 | 181 | 241 | 72.8% | 8.19 | 1.15 |
| Example 4 | 165 | 219 | 74.0% | 8.35 | 1.29 |
| Example 5 | 157 | 213 | 74.4% | 8.42 | 1.30 |
| Example 6 | 134 | 216 | 75.1% | 8.51 | 1.37 |
| Example 7 | 121 | 207 | 75.8% | 8.53 | 1.41 |
| Practice ofExample 8 | 105 | 201 | 76.9% | 8.60 | 1.50 |
| Example 9 | 100 | 186 | 77.4% | 8.61 | 1.55 |
| Example 10 | 97 | 179 | 78.6% | 8.82 | 1.65 |
| Example 11 | 89 | 160 | 78.9% | 8.63 | 1.57 |
| Example 12 | 76 | 157 | 79.9% | 8.90 | 1.66 |
| Example 13 | 60 | 121 | 85.3% | 9.15 | 1.81 |
| Example 14 | 55 | 119 | 85.9% | 9.22 | 1.89 |
| Example 15 | 42 | 102 | 87.2% | 9.32 | 1.98 |
| Example 16 | 49 | 101 | 87.9% | 9.36 | 2.03 |
| Comparative example 1 | 398 | 428 | 16.51% | 8.01 | 1.22 |
As can be seen from the combination of examples 1 to 5 and table 2, the polyurethane hot melt adhesive prepared by using polyvinyl alcohol, acrylic ester, polymethylene polyphenyl polyisocyanate and polyol solution in a specific weight range has the advantages of short open time, short curing time, high bonding strength and initial bonding strength, and certain degradability.
By combining example 3 with comparative example 1 and table 2, it can be seen that, in comparison with a hot melt adhesive without polyvinyl alcohol, the hot melt adhesive obtained by preparing the modified acrylate according to the present application has the advantages of shortened opening time and curing time, enhanced degradation performance, and enhanced final adhesion strength and initial adhesion strength.
It can be seen from the combination of examples 6-7 and table 2 that, in the specific range, when the molecular weights of the polypropylene glycol and the polycaprolactone diol are relatively large, the hot melt adhesive can shorten the opening time and the curing time, and improve the initial adhesive strength and the final adhesive strength. It can be seen from the combination of examples 8-9 and Table 2 that by varying the weight percentage of polycaprolactone diol in the polyol solution, the overall performance of the hot melt adhesive is enhanced as the proportion of polycaprolactone diol is increased.
It can be seen by combining examples 10-12 and table 2 that the bis-morpholinyl diethyl ether can shorten the opening time and the curing time of the hot melt adhesive, the dibutyltin dilaurate can improve the final adhesion strength and the initial adhesion strength of the hot melt adhesive, and the two catalysts dibutyltin dilaurate and the bis-morpholinyl diethyl ether are compounded, so that the hot melt adhesive prepared together has the advantages of the two catalysts, and the degradability of the hot melt adhesive can be improved.
It can be seen by combining examples 13-14 and table 2 that the preparation methods of the modified acrylate are different, and the relevant properties of the polyurethane hot melt adhesive can be changed, wherein the polyurethane hot melt adhesive prepared after the special treatment has stronger degradability, probably because the temperature change in the system can cause the polyvinyl alcohol to react with the acrylate in the process of modifying the acrylate, thereby improving the degradability of the polyurethane hot melt adhesive. In addition, the hot melt adhesive prepared from the specially treated modified acrylate has shorter opening time and curing time, and stronger initial adhesion strength and bonding strength.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. A reactive polyurethane hot melt adhesive is characterized by mainly comprising the following components in parts by weight: 30-45 parts of polymethylene polyphenyl polyisocyanate, 10-15 parts of polyalcohol solution and 20-35 parts of modified acrylic ester, wherein the modified acrylic ester comprises the following components in parts by weight: 25-40 parts of acrylate, 10-25 parts of polyvinyl alcohol and 35-55 parts of water.
2. The reactive polyurethane hot melt adhesive according to claim 1, wherein the modified acrylate comprises the following components in parts by weight: 30-40 parts of acrylic ester, 10-20 parts of polyvinyl alcohol and 40-50 parts of water.
3. The reactive polyurethane hot melt adhesive according to claim 1, wherein: the polyalcohol solution is one or the combination of two of polypropylene glycol and polycaprolactone glycol, the molecular weight of the polypropylene glycol is 1000-3000, and the molecular weight of the polycaprolactone glycol is 1000-2000.
4. The reactive polyurethane hot melt adhesive according to claim 1, wherein: the polyalcohol solution is a composition of polypropylene glycol and polycaprolactone diol, and the weight of the polycaprolactone diol accounts for 50-85% of the weight of the polyalcohol solution.
5. The reactive polyurethane hot melt adhesive according to claim 1, wherein: also comprises 0.5 to 1 weight part of catalyst.
6. The reactive polyurethane hot melt adhesive of claim 5, wherein: the catalyst is selected from one or two of dibutyltin dilaurate and dimorpholinyl diethyl ether.
7. The reactive polyurethane hot melt adhesive according to claim 1, wherein the preparation method of the modified acrylate is as follows: stirring the polyvinyl alcohol, the acrylic ester and the water for 10-30min at the stirring speed of 80-100 rpm.
8. The reactive polyurethane hot melt adhesive according to claim 1, wherein the preparation method of the modified acrylate is as follows: and magnetically stirring the polyvinyl alcohol, the acrylic ester and water for 1-2 hours at the temperature of 80-100 ℃ to obtain the modified acrylic ester.
9. The preparation method of the reactive polyurethane hot melt adhesive according to any one of claims 1 to 8, characterized by comprising the following steps:
(1) according to the weight portion, the polyalcohol solution and the modified acrylic ester are blended, the dehydration is carried out for 1.5 to 3 hours under the conditions that the temperature is 100 ℃ and 150 ℃ and the absolute vacuum degree is 0.080 to 0.12MPa, and the heating is stopped to obtain a mixed solution A;
(2) and (2) adding polymethylene polyphenyl polyisocyanate into the mixed solution A according to the weight part, stirring, and controlling the stirring temperature of the system to be 70-100 ℃ and the reaction time to be 0.5-2h to obtain the reactive polyurethane hot melt adhesive.
10. The preparation method of the reactive polyurethane hot melt adhesive according to claim 9, characterized in that: the absolute vacuum degree is 0.090-0.100 MPa.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102936471A (en) * | 2012-10-18 | 2013-02-20 | 青州市天源化工有限公司 | Aqueous polymer-isocyanate adhesive and preparation method thereof |
| CN102977838A (en) * | 2012-12-22 | 2013-03-20 | 昆山天洋热熔胶有限公司 | Moisturecuring polyurethane hot melt adhesive for lining cloth and preparation method of moisturecuring polyurethane hot melt adhesive |
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2021
- 2021-03-12 CN CN202110271370.9A patent/CN112980382A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102936471A (en) * | 2012-10-18 | 2013-02-20 | 青州市天源化工有限公司 | Aqueous polymer-isocyanate adhesive and preparation method thereof |
| CN102977838A (en) * | 2012-12-22 | 2013-03-20 | 昆山天洋热熔胶有限公司 | Moisturecuring polyurethane hot melt adhesive for lining cloth and preparation method of moisturecuring polyurethane hot melt adhesive |
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| 曾跃 主编: "《物理化学实验》", 2 February 2019, 湖南师范大学出版社 * |
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