CN110734714A - polyvinyl acetate emulsion adhesive with low viscosity and high solid content and preparation method thereof - Google Patents
polyvinyl acetate emulsion adhesive with low viscosity and high solid content and preparation method thereof Download PDFInfo
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- CN110734714A CN110734714A CN201910994438.9A CN201910994438A CN110734714A CN 110734714 A CN110734714 A CN 110734714A CN 201910994438 A CN201910994438 A CN 201910994438A CN 110734714 A CN110734714 A CN 110734714A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J131/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid, or of a haloformic acid; Adhesives based on derivatives of such polymers
- C09J131/02—Homopolymers or copolymers of esters of monocarboxylic acids
- C09J131/04—Homopolymers or copolymers of vinyl acetate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/22—Emulsion polymerisation
- C08F2/24—Emulsion polymerisation with the aid of emulsifying agents
- C08F2/30—Emulsion polymerisation with the aid of emulsifying agents non-ionic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F218/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid or of a haloformic acid
- C08F218/02—Esters of monocarboxylic acids
- C08F218/04—Vinyl esters
- C08F218/08—Vinyl acetate
Abstract
The invention discloses polyvinyl acetate emulsion adhesives with low viscosity and high solid content and a preparation method thereof, which take protective colloid, reaction monomers, modified monomers, initiators, emulsifiers, plasticizers, pH regulators and deionized water as raw materials, obtain initial emulsion through polymerization, and then add the protective colloid into the initial emulsion according to needs to adjust the adhesion and solid content of the emulsion to meet the requirements, thereby obtaining target products.
Description
Technical Field
The invention relates to the technical field of high-molecular emulsion polymerization, in particular to low-viscosity high-solid polyvinyl acetate emulsion adhesive and a preparation method thereof.
Technical Field
The polyvinyl acetate emulsion (white emulsion) is types of water-base adhesive, and is mainly used in adhesive, wooden products, paper processing, building wall scraping, joint paper pasting, cigarette industry, etc. the white emulsion uses water as dispersing medium, and has the advantages of no toxicity, no harm, no combustion, no environmental pollution, simple production, good performance, etc.
The common emulsion polymerization can reach the highest solid content of 74 percent theoretically, and the viscosity of the emulsion can rise rapidly when the solid content of the emulsion is higher than 50 percent in the normal production process, so the production of the low-viscosity high-solid content white latex is difficult to realize by adopting the common emulsion polymerization method, the production of the low-viscosity high-solid content white latex can be realized by adopting the secondary granulation method theoretically, but the production equipment is complex, the production time is long (8-10 hours), and in order to meet the requirements of quick bonding and small curing shrinkage rate, kinds of low-viscosity high-solid content white latex are inevitably developed.
Patent CN201510906448.4 discloses high-solid-content polyvinyl acetate emulsion and a preparation method thereof, wherein the solid content of the emulsion is 66-70%, and the viscosity of the emulsion is lower than 3000 mPa.
Patent CN201410696110.6 discloses a preparation method of kinds of high-solid-content white latex, wherein 25% of solid content is added into white latex with the solid content of 30% to achieve the purpose of 50-55% of solid content.
Disclosure of Invention
Based on the problems in the prior art, the invention aims to provide kinds of low-viscosity high-solid content polyvinyl acetate emulsion adhesive and a preparation method thereof, so that the adhesive can be stably produced industrially, and different requirements on viscosity and solid content are met.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention firstly discloses low-viscosity high-solid-content polyvinyl acetate emulsion adhesive which is characterized by comprising the following raw materials, by weight, 15-35 parts of protective colloid, 400-500 parts of reaction monomer, 40-50 parts of modified monomer, 1-2 parts of initiator, 0.5-1.5 parts of emulsifier, 40-50 parts of plasticizer, 3-7 parts of pH regulator and 420-430 parts of deionized water.
Preferably, the protective colloid is at least of polymethyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose and polyvinyl alcohol, and the polymerization degree and alcoholysis degree of the polyvinyl alcohol are 400-2400 and 88-99 respectively.
Preferably, the reactive monomer is vinyl acetate.
Preferably, the modifying monomer is at least of butyl acrylate, hydroxypropyl acrylate, methyl acrylate and ethyl acrylate.
Preferably, the initiator is at least of hydrogen peroxide, potassium persulfate and ammonium persulfate.
Preferably, the emulsifier is at least of octyl phenol polyoxyethylene ether, nonyl phenol polyoxyethylene ether and fatty alcohol polyoxyethylene ether.
Preferably, the plasticizer is at least of dibutyl phthalate, diethyl phthalate and di (2-ethylhexyl) phthalate.
Preferably, the pH regulator is at least of sodium acetate, sodium bicarbonate or sodium citrate.
The invention also discloses a preparation method of the low-viscosity high-solid polyvinyl acetate emulsion adhesive, which comprises the following steps:
1) adding 350-400 parts of deionized water into a three-neck flask, heating to 80-90 ℃, adding 15-35 parts of protective colloid in a stirring state, continuously stirring until the protective colloid is completely dissolved, and cooling to 60-70 ℃;
2) weighing 1-2 parts of initiator, and dissolving in 20-30 parts of deionized water for later use; weighing 40-50 parts of modified monomer and 400-500 parts of reaction monomer for later use;
3) adding 8-12 parts of initiator aqueous solution completely dissolved and 0.5-1.5 parts of emulsifier into the three-neck flask subjected to cooling in the step 1), and then adding 8-10 parts of modified monomer and 50-70 parts of reaction monomer to perform seed emulsion polymerization, wherein the reaction time is 25-35 minutes;
4) heating a three-neck flask to 75-85 ℃, then mixing the remaining modified monomer and reaction monomer, and gradually dropwise adding the mixture into the three-neck flask for emulsion polymerization, wherein the dropwise adding time is 4-6 hours, and times of remaining initiator aqueous solution are added at intervals of 0.5 hour in the dropwise adding process, and the adding amount of each time is equal;
5) after the dropwise addition is finished, cooling to 35-45 ℃, adding 3-7 parts of pH regulator to regulate the pH of the emulsion to 5-6, adding 40-50 parts of plasticizer, and uniformly stirring to complete emulsion polymerization to obtain an initial emulsion;
6) detecting the adhesion and solid content of the initial emulsion obtained in the step 5), and then additionally adding a proper amount of protective colloid at 80-90 ℃ as required to adjust the adhesion and solid content of the emulsion to meet the requirement, so as to obtain the target product.
The solid content of the white latex prepared by the method can reach 50-70%, the viscosity is 500-8000 mPa & s, and both the solid content and the viscosity are in a controllable range, so that the requirements of customers can be basically met.
The invention has the beneficial effects that:
1. the invention provides kinds of low-viscosity high-solid content white emulsion which can realize industrial production and has adjustable viscosity and solid content, can meet the requirements of most customers, and greatly improves the market competitiveness of products;
2. after the production of the white latex is finished, the viscosity and the solid content can be adjusted by adding the protective colloid, the method is simple, the requirements of customers can be perfectly met, and other properties of the white latex cannot be influenced;
3. the production method of the white latex provided by the invention is safe and environment-friendly, has stable product quality, and accords with national policy and guidelines.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1
The low-viscosity high-solid content polyvinyl acetate emulsion adhesive of the embodiment comprises the following raw materials in parts by weight: 15 parts of protective colloid, 400 parts of reaction monomer, 30 parts of modified monomer A, 10 parts of modified monomer B, 1 part of initiator, 0.5 part of emulsifier, 40 parts of plasticizer, 3 parts of pH regulator and 370 parts of deionized water.
Specifically, the raw materials used in this example are as follows: the protective colloid is polyvinyl alcohol 17-88; the reaction monomer is vinyl acetate; the modified monomer A is butyl acrylate, and the modified monomer B is hydroxypropyl acrylate; the initiator is ammonium persulfate; the emulsifier is octyl phenol polyoxyethylene ether; the plasticizer is dibutyl phthalate; the pH regulator is sodium acetate.
The preparation method of the polyvinyl acetate emulsion adhesive comprises the following steps:
1) adding 350 parts of deionized water into a three-neck flask, heating to 80 ℃, adding 15 parts of protective colloid under a stirring state, continuously stirring until the protective colloid is completely dissolved, and cooling to 60 ℃;
2) weighing 1 part of initiator, and dissolving the initiator in 20 parts of deionized water for later use; weighing 40 parts of modified monomer and 400 parts of reaction monomer for later use;
3) adding 8 parts of initiator aqueous solution completely dissolved and 0.5 part of emulsifier into the three-neck flask subjected to cooling in the step 1), and then adding 8 parts of modified monomer and 50 parts of reaction monomer to perform seed emulsion polymerization, wherein the reaction time is 25 minutes;
4) heating a three-neck flask to 75 ℃, then mixing the remaining modified monomer and reaction monomer, and gradually dropwise adding the mixture into the three-neck flask for emulsion polymerization, wherein the dropwise adding time is 4 hours, and times of remaining initiator aqueous solution are added at intervals of 0.5 hour in the dropwise adding process, and the adding amount of each time is equal;
5) after the dropwise addition is finished, cooling to 35 ℃, adding 3 parts of pH regulator to regulate the pH of the emulsion to 5, adding 40 parts of plasticizer, and uniformly stirring to finish emulsion polymerization to obtain initial emulsion;
6) the initial emulsion obtained in step 5) was tested for binding and solids content, the results of which are shown in Table 1.
Example 2
The low-viscosity high-solid content polyvinyl acetate emulsion adhesive of the embodiment comprises the following raw materials in parts by weight: 35 parts of protective colloid, 500 parts of reaction monomer, 35 parts of modified monomer A, 15 parts of modified monomer B, 2 parts of initiator, 1.5 parts of emulsifier, 50 parts of plasticizer, 7 parts of pH regulator and 430 parts of deionized water.
Specifically, the raw materials used in this example are as follows: the protective colloid is carboxymethyl cellulose; the reaction monomer is vinyl acetate; the modified monomer A is methyl acrylate, and the modified monomer B is hydroxypropyl acrylate; the initiator is potassium persulfate; the emulsifier is polyoxyethylene nonyl phenyl ether; the plasticizer is diethyl phthalate; the pH regulator is sodium bicarbonate.
The preparation method of the polyvinyl acetate emulsion adhesive comprises the following steps:
1) adding 400 parts of deionized water into a three-neck flask, heating to 90 ℃, adding 35 parts of protective colloid under a stirring state, continuously stirring until the protective colloid is completely dissolved, and cooling to 70 ℃;
2) weighing 2 parts of initiator, and dissolving the initiator in 30 parts of deionized water for later use; weighing 50 parts of modified monomer and 500 parts of reaction monomer for later use;
3) adding 12 parts of initiator aqueous solution completely dissolved and 1.5 parts of emulsifier into the three-neck flask subjected to cooling in the step 1), and then adding 10 parts of modified monomer and 70 parts of reaction monomer to perform seed emulsion polymerization for 35 minutes;
4) heating a three-neck flask to 85 ℃, then mixing the residual modified monomer and reaction monomer, and gradually dropwise adding the mixture into the three-neck flask for emulsion polymerization, wherein the dropwise adding time is 6 hours, and times of residual initiator aqueous solution are added at intervals of 0.5 hour in the dropwise adding process, and the adding amount of each time is equal;
5) after the dropwise addition is finished, cooling to 45 ℃, adding 7 parts of pH regulator to regulate the pH of the emulsion to 6, adding 50 parts of plasticizer, and uniformly stirring to finish emulsion polymerization to obtain initial emulsion;
6) the initial emulsion obtained in step 5) was tested for binding and solids content, the results of which are shown in Table 1. Then 69 parts of protective colloid polyvinyl alcohol 17-88 is additionally added at 85 ℃ as required to adjust the bonding and solid content of the emulsion to meet the requirements, and a target product is obtained, and the detection results of the viscosity and the solid content are shown in table 1.
Example 3
The low-viscosity high-solid content polyvinyl acetate emulsion adhesive of the embodiment comprises the following raw materials in parts by weight: 25 parts of protective colloid, 500 parts of reaction monomer, 20 parts of modified monomer A, 10 parts of modified monomer B, 10 parts of modified monomer C, 1.5 parts of initiator, 0.5 part of emulsifier A, 0.5 part of emulsifier B, 45 parts of plasticizer, 5 parts of pH regulator and 370 parts of deionized water.
Specifically, the raw materials used in this example are as follows: the protective colloid is polyvinyl alcohol 17-88; the reaction monomer is vinyl acetate; the modified monomer A is butyl acrylate, the modified monomer B is ethyl acrylate, and the modified monomer C is methyl acrylate; the initiator is ammonium persulfate; the emulsifier A is fatty alcohol polyoxyethylene ether, and the emulsifier B is octyl phenol polyoxyethylene ether; the plasticizer is di (2-ethylhexyl) phthalate; the pH regulator is sodium citrate.
The preparation method of the polyvinyl acetate emulsion adhesive comprises the following steps:
1) adding 350 parts of deionized water into a three-neck flask, heating to 90 ℃, adding 25 parts of protective colloid under a stirring state, continuously stirring until the protective colloid is completely dissolved, and cooling to 70 ℃;
2) weighing 1.5 parts of initiator, and dissolving in 20 parts of deionized water for later use; weighing 40 parts of modified monomer and 500 parts of reaction monomer for later use;
3) adding 12 parts of initiator aqueous solution completely dissolved and 1 part of emulsifier into the three-neck flask subjected to cooling in the step 1), and then adding 8 parts of modified monomer and 70 parts of reaction monomer to perform seed emulsion polymerization for 30 minutes;
4) heating a three-neck flask to 80 ℃, then mixing the remaining modified monomer and reaction monomer, and gradually dropwise adding the mixture into the three-neck flask for emulsion polymerization, wherein the dropwise adding time is 5 hours, and times of remaining initiator aqueous solution are added at intervals of 0.5 hour in the dropwise adding process, and the adding amount of each time is equal;
5) after the dropwise addition is finished, cooling to 45 ℃, adding 5 parts of pH regulator to regulate the pH of the emulsion to 5, adding 45 parts of plasticizer, and uniformly stirring to finish emulsion polymerization to obtain initial emulsion;
6) the initial emulsion obtained in step 5) was tested for binding and solids content, the results of which are shown in Table 1. Then 99 parts of protective colloid polyvinyl alcohol 04-88 is additionally added at 85 ℃ as required to adjust the adhesion and solid content of the emulsion to meet the requirements, and a target product is obtained, and the detection results of the viscosity and the solid content are shown in table 1.
Example 4
The low-viscosity high-solid content polyvinyl acetate emulsion adhesive of the embodiment comprises the following raw materials in parts by weight: 15 parts of protective colloid, 400 parts of reaction monomer, 20 parts of modified monomer A, 5 parts of modified monomer B, 15 parts of modified monomer C, 1 part of initiator, 1.5 parts of emulsifier, 40 parts of plasticizer, 7 parts of pH regulator and 430 parts of deionized water.
Specifically, the raw materials used in this example are as follows: the protective colloid is polyvinyl alcohol 17-88; the reaction monomer is vinyl acetate; the modified monomer A is butyl acrylate, the modified monomer B is hydroxypropyl acrylate, and the modified monomer C is methyl acrylate; the initiator is ammonium persulfate; the emulsifier is octyl phenol polyoxyethylene ether; the plasticizer is dibutyl phthalate; the pH regulator is sodium acetate.
The preparation method of the polyvinyl acetate emulsion adhesive comprises the following steps:
1) adding 400 parts of deionized water into a three-neck flask, heating to 90 ℃, adding 15 parts of protective colloid under a stirring state, continuously stirring until the protective colloid is completely dissolved, and cooling to 60 ℃;
2) weighing 1 part of initiator, and dissolving in 30 parts of deionized water for later use; weighing 40 parts of modified monomer and 400 parts of reaction monomer for later use;
3) adding 10 parts of initiator aqueous solution completely dissolved and 1.5 parts of emulsifier into the three-neck flask subjected to cooling in the step 1), and then adding 10 parts of modified monomer and 70 parts of reaction monomer to perform seed emulsion polymerization for 35 minutes;
4) heating a three-neck flask to 85 ℃, then mixing the residual modified monomer and reaction monomer, and gradually dropwise adding the mixture into the three-neck flask for emulsion polymerization, wherein the dropwise adding time is 6 hours, and times of residual initiator aqueous solution are added at intervals of 0.5 hour in the dropwise adding process, and the adding amount of each time is equal;
5) after the dropwise addition is finished, cooling to 45 ℃, adding 7 parts of pH regulator to regulate the pH of the emulsion to 5.5, adding 40 parts of plasticizer, and uniformly stirring to finish emulsion polymerization to obtain initial emulsion;
6) the initial emulsion obtained in step 5) was tested for binding and solids content, the results of which are shown in Table 1. Then 66 parts of protective colloid polyvinyl alcohol 04-88 is additionally added at 85 ℃ as required to adjust the adhesion and solid content of the emulsion to meet the requirements, and a target product is obtained, wherein the detection results of the viscosity and the solid content are shown in table 1.
Example 5
The low-viscosity high-solid content polyvinyl acetate emulsion adhesive of the embodiment comprises the following raw materials in parts by weight: 20 parts of protective colloid, 400 parts of reaction monomer, 20 parts of modified monomer A, 5 parts of modified monomer B, 15 parts of modified monomer C, 1.5 parts of initiator, 1 part of emulsifier, 42 parts of plasticizer, 4 parts of pH regulator and 400 parts of deionized water.
Specifically, the raw materials used in this example are as follows: the protective colloid is polyvinyl alcohol 20-88; the reaction monomer is vinyl acetate; the modified monomer A is butyl acrylate, the modified monomer B is hydroxypropyl acrylate, and the modified monomer C is methyl acrylate; the initiator is ammonium persulfate; the emulsifier is octyl phenol polyoxyethylene ether; the plasticizer is dibutyl phthalate; the pH regulator is sodium acetate.
The preparation method of the polyvinyl acetate emulsion adhesive comprises the following steps:
1) adding 370 parts of deionized water into a three-neck flask, heating to 80 ℃, adding 20 parts of protective colloid under a stirring state, continuously stirring until the protective colloid is completely dissolved, and cooling to 65 ℃;
2) weighing 1.5 parts of initiator, and dissolving in 30 parts of deionized water for later use; weighing 40 parts of modified monomer and 400 parts of reaction monomer for later use;
3) adding 12 parts of initiator aqueous solution completely dissolved and 1.5 parts of emulsifier into the three-neck flask subjected to cooling in the step 1), and then adding 9 parts of modified monomer and 60 parts of reaction monomer to perform seed emulsion polymerization for 30 minutes;
4) heating a three-neck flask to 80 ℃, then mixing the remaining modified monomer and reaction monomer, and gradually dropwise adding the mixture into the three-neck flask for emulsion polymerization, wherein the dropwise adding time is 5 hours, and times of remaining initiator aqueous solution are added at intervals of 0.5 hour in the dropwise adding process, and the adding amount of each time is equal;
5) after the dropwise addition is finished, cooling to 45 ℃, adding 4 parts of pH regulator to regulate the pH of the emulsion to 5.5, adding 42 parts of plasticizer, and uniformly stirring to finish emulsion polymerization to obtain initial emulsion;
6) the initial emulsion obtained in step 5) was tested for binding and solids content, the results of which are shown in Table 1. Then, 43 parts of polyvinyl alcohol 17-88 protective colloid is additionally added at 85 ℃ as required to adjust the adhesion and solid content of the emulsion to meet the requirements, so as to obtain a target product, and the detection results of the viscosity and the solid content are shown in table 1.
Example 6
The low-viscosity high-solid content polyvinyl acetate emulsion adhesive of the embodiment comprises the following raw materials in parts by weight: 20 parts of protective colloid, 450 parts of reaction monomer, 20 parts of modified monomer A, 5 parts of modified monomer B, 15 parts of modified monomer C, 2 parts of initiator, 1.3 parts of emulsifier, 50 parts of plasticizer, 6 parts of pH regulator and 400 parts of deionized water.
Specifically, the raw materials used in this example are as follows: the protective colloid is 24-88 of polyvinyl alcohol; the reaction monomer is vinyl acetate; the modified monomer A is butyl acrylate, the modified monomer B is hydroxypropyl acrylate, and the modified monomer C is methyl acrylate; the initiator is ammonium persulfate; the emulsifier is octyl phenol polyoxyethylene ether; the plasticizer is dibutyl phthalate; the pH regulator is sodium acetate.
The preparation method of the polyvinyl acetate emulsion adhesive comprises the following steps:
1) adding 370 parts of deionized water into a three-neck flask, heating to 85 ℃, adding 20 parts of protective colloid under a stirring state, continuously stirring until the protective colloid is completely dissolved, and cooling to 65 ℃;
2) weighing 2 parts of initiator, and dissolving the initiator in 30 parts of deionized water for later use; weighing 40 parts of modified monomer and 450 parts of reaction monomer for later use;
3) adding 11 parts of initiator aqueous solution completely dissolved and 1.3 parts of emulsifier into the three-neck flask subjected to cooling in the step 1), and then adding 9 parts of modified monomer and 55 parts of reaction monomer to perform seed emulsion polymerization for 30 minutes;
4) heating a three-neck flask to 82 ℃, then mixing the residual modified monomer and reaction monomer, and gradually dropwise adding the mixture into the three-neck flask for emulsion polymerization, wherein the dropwise adding time is 5 hours, and times of residual initiator aqueous solution are added at intervals of 0.5 hour in the dropwise adding process, and the adding amount of each time is equal;
5) after the dropwise addition is finished, cooling to 40 ℃, adding 6 parts of pH regulator to regulate the pH of the emulsion to 5.5, adding 50 parts of plasticizer, and uniformly stirring to finish emulsion polymerization to obtain initial emulsion;
6) the initial emulsion obtained in step 5) was tested for binding and solids content, the results of which are shown in Table 1. Then, 65 parts of protective colloid polyvinyl alcohol 24-88 is additionally added at 85 ℃ as required to adjust the adhesion and solid content of the emulsion to meet the requirements, so as to obtain the target product, and the detection results of the viscosity and solid content are shown in table 1.
TABLE 1 test results of examples
The above description is only exemplary of the present invention and should not be taken as limiting the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
- The adhesive is characterized by comprising the following raw materials, by weight, 15-35 parts of a protective colloid, 400-500 parts of a reaction monomer, 40-50 parts of a modification monomer, 1-2 parts of an initiator, 0.5-1.5 parts of an emulsifier, 40-50 parts of a plasticizer, 3-7 parts of a pH regulator and 370-430 parts of deionized water.
- 2. The adhesive according to claim 1, wherein the protective colloid is at least selected from the group consisting of poly methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose and polyvinyl alcohol, and the polyvinyl alcohol has a degree of polymerization of 400-2400 and a degree of alcoholysis of 88-99%.
- 3. The low viscosity high solids polyvinyl acetate emulsion adhesive of claim 1 wherein: the reaction monomer is vinyl acetate.
- 4. The adhesive of claim 1, wherein said at least one modifying monomer is at least selected from the group consisting of butyl acrylate, hydroxypropyl acrylate, methyl acrylate and ethyl acrylate.
- 5. The adhesive of claim 1, wherein said initiator is at least selected from the group consisting of hydrogen peroxide, potassium persulfate, and ammonium persulfate.
- 6. The adhesive of claim 1, wherein said emulsifier is at least selected from the group consisting of polyoxyethylene octylphenol ether, polyoxyethylene nonylphenol ether, and polyoxyethylene fatty alcohol ether.
- 7. The adhesive according to claim 1, wherein said plasticizer is at least selected from the group consisting of dibutyl phthalate, diethyl phthalate and di (2-ethylhexyl) phthalate.
- 8. The emulsion adhesive of claim 1, wherein said pH regulator is at least selected from sodium acetate, sodium bicarbonate and sodium citrate.
- 9, A method for preparing the low-viscosity high-solid polyvinyl acetate emulsion adhesive of any of claims 1-8, which is characterized by comprising the following steps:1) adding 350-400 parts of deionized water into a three-neck flask, heating to 80-90 ℃, adding 15-35 parts of protective colloid in a stirring state, continuously stirring until the protective colloid is completely dissolved, and cooling to 60-70 ℃;2) weighing 1-2 parts of initiator, and dissolving in 20-30 parts of deionized water for later use; weighing 40-50 parts of modified monomer and 400-500 parts of reaction monomer for later use;3) adding 8-12 parts of initiator aqueous solution completely dissolved and 0.5-1.5 parts of emulsifier into the three-neck flask subjected to cooling in the step 1), and then adding 8-10 parts of modified monomer and 50-70 parts of reaction monomer to perform seed emulsion polymerization, wherein the reaction time is 25-35 minutes;4) heating a three-neck flask to 75-85 ℃, then mixing the remaining modified monomer and reaction monomer, and gradually dropwise adding the mixture into the three-neck flask for emulsion polymerization, wherein the dropwise adding time is 4-6 hours, and times of remaining initiator aqueous solution are added at intervals of 0.5 hour in the dropwise adding process, and the adding amount of each time is equal;5) after the dropwise addition is finished, cooling to 35-45 ℃, adding 3-7 parts of pH regulator to regulate the pH of the emulsion to 5-6, adding 40-50 parts of plasticizer, and uniformly stirring to complete emulsion polymerization to obtain an initial emulsion;6) detecting the adhesion and solid content of the initial emulsion obtained in the step 5), and then additionally adding a proper amount of protective colloid at 80-90 ℃ as required to adjust the adhesion and solid content of the emulsion to meet the requirement, so as to obtain the target product.
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| CN112322230A (en) * | 2020-11-04 | 2021-02-05 | 巢湖皖维金泉实业有限公司 | Polyvinyl acetate emulsion adhesive with excellent water resistance and preparation method thereof |
| CN114031709A (en) * | 2021-10-20 | 2022-02-11 | 顶立新材料科技有限公司 | High-solid low-viscosity large-particle-size polyvinyl acetate emulsion and preparation method thereof |
| CN115260949A (en) * | 2022-08-08 | 2022-11-01 | 江苏顺泰包装印刷科技有限公司 | Environment-friendly weak-rubber-grain high-viscosity water-based white latex and preparation method thereof |
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| CN114031709A (en) * | 2021-10-20 | 2022-02-11 | 顶立新材料科技有限公司 | High-solid low-viscosity large-particle-size polyvinyl acetate emulsion and preparation method thereof |
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