CN111187593A - Polymer emulsion adhesive and preparation method and application thereof - Google Patents
Polymer emulsion adhesive and preparation method and application thereof Download PDFInfo
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- CN111187593A CN111187593A CN202010149901.2A CN202010149901A CN111187593A CN 111187593 A CN111187593 A CN 111187593A CN 202010149901 A CN202010149901 A CN 202010149901A CN 111187593 A CN111187593 A CN 111187593A
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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
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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
- C08F2/26—Emulsion polymerisation with the aid of emulsifying agents anionic
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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
- 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
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
Abstract
The invention discloses a polymer emulsion adhesive and a preparation method and application thereof, belonging to the technical field of adhesives. The polymer emulsion adhesive comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 100 (10-30); the component A comprises the following components: vinyl acetate, polyvinyl alcohol, vinyl neodecanoate, n-butyl methacrylate, hydroxyethyl acrylate, 2-ethylhexyl acrylate, an anionic emulsifier, a nonionic emulsifier, a crosslinking agent, an initiator, a filler, a stabilizer, a bactericide and water; the component B is isocyanate. The polymer emulsion adhesive prepared by using the raw materials of vinyl acetate, polyvinyl alcohol, vinyl neodecanoate, butyl methacrylate, hydroxyethyl acrylate, 2-ethylhexyl acrylate, an anionic emulsifier, a nonionic emulsifier and the like has good bonding strength and water and heat resistance.
Description
Technical Field
The invention relates to the technical field of adhesives, in particular to a polymer emulsion adhesive and a preparation method and application thereof.
Background
The polyvinyl acetate emulsion has been widely applied to the field of wood bonding for a long time, and has the advantages of moderate price, high bonding strength, no need of thermal bonding, controllable glue solution viscosity and the like, which are difficult to completely possess by other adhesives, but the defects are obvious, and because a large number of ester groups and hydroxyl groups introduced by polyvinyl alcohol exist in the polyvinyl acetate, the moisture resistance and hydrolysis resistance of the polyvinyl acetate are poor, so that the application of the polyvinyl acetate emulsion to the fields of moisture resistance and heat resistance of wood is limited.
Currently, urea-formaldehyde resin can be used in the industry to bond with a certain amount of melamine-formaldehyde resin by a thermosetting method so as to meet the requirement of water resistance. But because of the introduction of formaldehyde, the environmental pollution is difficult to completely avoid in processing and use. The high temperature of the heat cure limits the use of some expensive wood veneers. In addition, adhesives using soybean gum, vegetable gum, and the like instead of the trialdehyde resin have been developed in the industry, but they are inferior in water resistance and cannot be cold-bonded.
Therefore, an adhesive with excellent water resistance is needed to be found for bonding wood.
Disclosure of Invention
It is an object of embodiments of the present invention to provide a polymer emulsion adhesive to solve the above problems in the background art.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
a polymer emulsion adhesive comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 100 (10-30);
the component A comprises the following components in parts by mass: 10-30% of vinyl acetate, 3-8% of polyvinyl alcohol, 1-5% of vinyl neodecanoate, 3-10% of n-butyl methacrylate, 1-10% of hydroxyethyl acrylate, 0.1-2% of 2-ethylhexyl acrylate, 0.1-2% of anionic emulsifier, 1-2% of nonionic emulsifier, 0.1-0.5% of cross-linking agent, 0.1-0.5% of initiator, 5-15% of filler, 0.1-0.5% of stabilizer, 0.1-0.3% of bactericide and the balance of water, wherein the sum of the mass fractions of the components is 100%;
the component B is isocyanate.
As a preferable scheme of the embodiment of the invention, the component A comprises the following components in percentage by mass: 15-20% of vinyl acetate, 5-6% of polyvinyl alcohol, 2-3% of vinyl neodecanoate, 5-7.5% of n-butyl methacrylate, 3-5% of hydroxyethyl acrylate, 0.5-1% of acrylic acid-2-ethylhexyl ester, 0.5-2% of anionic emulsifier, 1.5-2% of nonionic emulsifier, 0.3-0.5% of cross-linking agent, 0.2-0.5% of initiator, 5-10% of filler, 0.1-0.3% of stabilizer, 0.1-0.15% of bactericide and the balance of water, wherein the sum of the mass fractions of the components is 100%; the isocyanate is one or more of diphenylmethane diisocyanate, polymethylene polyphenyl isocyanate and hexamethylene diisocyanate. Preferably, the isocyanate is polymethylene polyphenyl isocyanate.
As another preferable aspect of the embodiment of the present invention, the polyvinyl alcohol is one or more of polyvinyl alcohol 1788, polyvinyl alcohol 2088 and polyvinyl alcohol 2488; the alcoholysis degree of the polyvinyl alcohol is 86-89%. Preferably, the polyvinyl alcohol is polyvinyl alcohol 2088, which has an alcoholysis degree of 88%.
As another preferable aspect of the embodiment of the present invention, the anionic emulsifier is one or more of sodium lauryl sulfate (K12 emulsifier), sodium vinylsulfonate (SVS emulsifier), lauric diethanolamide, sodium alkylphenol ether sulfosuccinate, ethoxylated ammonium alkylphenol sulfate (CO436 emulsifier, MS-1 emulsifier); the nonionic emulsifier is one or more of condensate of alkylphenol and ethylene oxide (OP-10 emulsifier, TX-10 emulsifier), and adduct of fatty alcohol and ethylene oxide (AEO-09 emulsifier). Preferably, the anionic emulsifier is a K12 emulsifier; the nonionic emulsifier is OP-10 emulsifier.
As another preferable aspect of the embodiment of the present invention, the crosslinking agent is one or more of N-methylol acrylamide, N' N-methylene bisacrylamide, diketiminate acrylamide, glycidyl acrylate, glycidyl methacrylate, itaconic acid, maleic anhydride, and vinyl trimethoxy silane; the initiator is one or more of ammonium persulfate, potassium persulfate, hydrogen peroxide, sodium percarbonate, tert-butyl hydroperoxide and azobisisobutyronitrile. Preferably, the cross-linking agent is N-methylolacrylamide; the initiator is ammonium persulfate.
As another preferable solution of the embodiment of the present invention, the filler is one or more of calcium carbonate, corn starch, titanium dioxide, kaolin, barite, talc and alumina. Preferably, the filler is calcium carbonate with fineness of more than 600 meshes.
As another preferable scheme of the embodiment of the invention, the stabilizer is one or more of sodium acetate, sodium phosphate, sodium carbonate, sodium bicarbonate, sodium hydroxide and saturated ammonia water; the bactericide is one or more of benzisothiazolinone, isothiazolinone, formaldehyde and dimethomorph. Preferably, the stabilizer is sodium acetate; the bactericide is benzisothiazolinone.
Another object of an embodiment of the present invention is to provide a method for preparing the polymer emulsion adhesive, which includes the following steps:
weighing vinyl acetate, polyvinyl alcohol, vinyl neodecanoate, n-butyl methacrylate, hydroxyethyl acrylate, 2-ethylhexyl acrylate, an anionic emulsifier, a nonionic emulsifier, a cross-linking agent, an initiator, a filler, a stabilizer, a bactericide and water according to the mass fraction for later use;
mixing the polyvinyl alcohol and water at the temperature of 95-98 ℃ to obtain a mixed solution;
mixing the mixed solution with the anionic emulsifier, the nonionic emulsifier, the cross-linking agent and the stabilizer at the temperature of 30-50 ℃ to obtain a first mixture;
mixing the vinyl acetate, the vinyl neodecanoate, the n-butyl methacrylate, the hydroxyethyl acrylate and the 2-ethylhexyl acrylate to obtain a second mixture;
mixing the first mixture, the second mixture and an initiator at the temperature of 80-90 ℃, cooling to 40-60 ℃, adding the filler and a bactericide, and mixing to obtain the component A;
weighing isocyanate as a component B according to the mass ratio of the component A to the component B;
and mixing the component A with the component B to obtain the polymer emulsion adhesive.
Another object of the embodiments of the present invention is to provide a polymer emulsion adhesive prepared by the above preparation method.
The invention also aims to provide application of the polymer emulsion adhesive in wood bonding.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
according to the polymer emulsion adhesive provided by the embodiment of the invention, the adhesive strength, the water resistance and the heat resistance of materials can be ensured by using the raw materials such as vinyl acetate, polyvinyl alcohol, vinyl neodecanoate, butyl methacrylate, hydroxyethyl acrylate, 2-ethylhexyl acrylate, an anionic emulsifier, a nonionic emulsifier and the like. The ethylene neodecanoate can improve the heat resistance and the water resistance of the polymer emulsion adhesive, the hydroxyethyl acrylate provides a molecular group crosslinked with isocyanate, and the polyvinyl alcohol can uniformly emulsify and disperse the isocyanate, so that the non-uniform crosslinking degree and the excessively high crosslinking speed are avoided. In addition, the emulsifier is used in cooperation with fillers such as calcium carbonate, so that the wettability of the polymer emulsion adhesive on the base material can be well improved, the effect of uniformly distributing and wetting the base material by the glue solution is achieved, and the adhesive is suitable for bonding wood and wood, and bonding wood and paper, leather and polyvinyl chloride material surface leather.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
This embodiment provides a polymer emulsion adhesive, the method of preparation comprising the steps of:
(1) weighing 150kg of vinyl acetate, 60kg of polyvinyl alcohol, 30kg of vinyl neodecanoate, 70kg of n-butyl methacrylate, 50kg of hydroxyethyl acrylate, 5kg of acrylic acid-2-ethylhexyl ester, 5kg of anionic emulsifier, 15kg of nonionic emulsifier, 5kg of cross-linking agent, 2kg of initiator, 100kg of filler, 1kg of stabilizer, 1kg of bactericide and 506kg of water for later use; wherein the polyvinyl alcohol is polyvinyl alcohol 2088 with alcoholysis degree of 88%, and specifically, commercially available Taiwan Changchun BP20 can be selected; the anionic emulsifier is a commercially available K12 emulsifier; the non-ionic emulsifier is a commercial OP-10 emulsifier; the cross-linking agent is N-methylol acrylamide; the initiator is ammonium persulfate; the filler is calcium carbonate with the fineness of more than 600 meshes; the stabilizer is sodium acetate; the bactericide is benzisothiazolinone.
(2) And (3) injecting the weighed water into the reaction kettle, starting stirring at a rotating speed of 60 revolutions per minute, adding the weighed polyvinyl alcohol while stirring, heating to 95 ℃, and stirring for 1 hour until the polyvinyl alcohol is completely dissolved to obtain a mixed solution.
(3) And cooling the mixed solution to 40 ℃, and then adding the anionic emulsifier, the nonionic emulsifier, the cross-linking agent and the stabilizer into the mixed solution for mixing to obtain a first mixture.
(4) Adding the vinyl acetate, the vinyl neodecanoate, the n-butyl methacrylate, the hydroxyethyl acrylate and the 2-ethylhexyl acrylate into a head tank, and mixing to obtain a second mixture.
(5) Firstly, 60kg of the second mixture in the head tank is put into the reaction kettle, stirred for 10 minutes for emulsification, and then 1kg of initiator is added; then, after the temperature is raised to 85 ℃, the rest second mixture in the head tank is gradually added into the reaction kettle within 5 hours, and 0.15kg of initiator is added every half hour until the rest initiator is completely added; then, the temperature is reduced to 50 ℃, and the filler and the bactericide are added and mixed to obtain the component A.
(6) And weighing polymethylene polyphenyl isocyanate as a component B, and mixing the component A and the component B according to the mass ratio of 100:15 to obtain the polymer emulsion adhesive.
Example 2
This embodiment provides a polymer emulsion adhesive, the method of preparation comprising the steps of:
(1) weighing 200kg of vinyl acetate, 60kg of polyvinyl alcohol, 30kg of vinyl neodecanoate, 50kg of n-butyl methacrylate, 30kg of hydroxyethyl acrylate, 5kg of acrylic acid-2-ethylhexyl ester, 5kg of anionic emulsifier, 15kg of nonionic emulsifier, 5kg of cross-linking agent, 2kg of initiator, 100kg of filler, 1kg of stabilizer, 1kg of bactericide and 506kg of water for later use; wherein the polyvinyl alcohol is polyvinyl alcohol 2088 with alcoholysis degree of 88%, and specifically, commercially available Taiwan Changchun BP20 can be selected; the anionic emulsifier is a commercially available K12 emulsifier; the non-ionic emulsifier is a commercial OP-10 emulsifier; the cross-linking agent is N-methylol acrylamide; the initiator is ammonium persulfate; the filler is talcum powder; the stabilizer is sodium carbonate; the bactericide is benzisothiazolinone.
(2) And (3) injecting the weighed water into the reaction kettle, starting stirring at a rotating speed of 60 revolutions per minute, adding the weighed polyvinyl alcohol while stirring, heating to 95 ℃, and stirring for 1 hour until the polyvinyl alcohol is completely dissolved to obtain a mixed solution.
(3) And cooling the mixed solution to 40 ℃, and then adding the anionic emulsifier, the nonionic emulsifier, the cross-linking agent and the stabilizer into the mixed solution for mixing to obtain a first mixture.
(4) Adding the vinyl acetate, the vinyl neodecanoate, the n-butyl methacrylate, the hydroxyethyl acrylate and the 2-ethylhexyl acrylate into a head tank, and mixing to obtain a second mixture.
(5) Firstly, 60kg of the second mixture in the head tank is put into the reaction kettle, stirred for 10 minutes for emulsification, and then 1kg of initiator is added; then, after the temperature is raised to 85 ℃, the rest second mixture in the head tank is gradually added into the reaction kettle within 6 hours, and 0.15kg of initiator is added every half hour until the rest initiator is completely added; then, the temperature is reduced to 50 ℃, and the filler and the bactericide are added and mixed to obtain the component A.
(6) And weighing polymethylene polyphenyl isocyanate as a component B, and mixing the component A and the component B according to the mass ratio of 100:15 to obtain the polymer emulsion adhesive.
Example 3
This embodiment provides a polymer emulsion adhesive, the method of preparation comprising the steps of:
(1) weighing 150kg of vinyl acetate, 60kg of polyvinyl alcohol, 30kg of vinyl neodecanoate, 75kg of n-butyl methacrylate, 40kg of hydroxyethyl acrylate, 10kg of 2-ethylhexyl acrylate, 5kg of anionic emulsifier, 15kg of nonionic emulsifier, 5kg of cross-linking agent, 2kg of initiator, 100kg of filler, 1kg of stabilizer, 1kg of bactericide and 506kg of water for later use; wherein the polyvinyl alcohol is polyvinyl alcohol 2088, the alcoholysis degree of which is 88 percent, and the commercially available Wanwei chemical polyvinyl alcohol 2088 can be specifically selected; the anionic emulsifier is a commercially available K12 emulsifier; the non-ionic emulsifier is a commercial OP-10 emulsifier; the cross-linking agent is N-methylol acrylamide; the initiator is ammonium persulfate; the filler is calcium carbonate; the stabilizer is sodium acetate; the bactericide is benzisothiazolinone.
(2) And (3) injecting the weighed water into the reaction kettle, starting stirring at a rotating speed of 60 revolutions per minute, adding the weighed polyvinyl alcohol while stirring, heating to 95 ℃, and stirring for 1 hour until the polyvinyl alcohol is completely dissolved to obtain a mixed solution.
(3) And cooling the mixed solution to 40 ℃, and then adding the anionic emulsifier, the nonionic emulsifier, the cross-linking agent and the stabilizer into the mixed solution for mixing to obtain a first mixture.
(4) Adding the vinyl acetate, the vinyl neodecanoate, the n-butyl methacrylate, the hydroxyethyl acrylate and the 2-ethylhexyl acrylate into a head tank, and mixing to obtain a second mixture.
(5) Firstly, 60kg of the second mixture in the head tank is put into the reaction kettle, stirred for 10 minutes for emulsification, and then 1kg of initiator is added; then, after the temperature is raised to 85 ℃, the rest second mixture in the head tank is gradually added into the reaction kettle within 5 hours, and 0.15kg of initiator is added every half hour until the rest initiator is completely added; then, the temperature is reduced to 50 ℃, and the filler and the bactericide are added and mixed to obtain the component A.
(6) And weighing polymethylene polyphenyl isocyanate as a component B, and mixing the component A and the component B according to the mass ratio of 100:15 to obtain the polymer emulsion adhesive.
Example 4
This embodiment provides a polymer emulsion adhesive, the method of preparation comprising the steps of:
(1) weighing 300kg of vinyl acetate, 80kg of polyvinyl alcohol, 50kg of vinyl neodecanoate, 30kg of n-butyl methacrylate, 10kg of hydroxyethyl acrylate, 1kg of 2-ethylhexyl acrylate, 1kg of anionic emulsifier, 10kg of nonionic emulsifier, 1kg of cross-linking agent, 1kg of initiator, 50kg of filler, 1kg of stabilizer, 1kg of bactericide and 464kg of water for later use; wherein, the polyvinyl alcohol is a mixture of polyvinyl alcohol 1788 and polyvinyl alcohol 2488, and the average alcoholysis degree is 86%; the anionic emulsifier is a mixture of a commercially available SVS emulsifier and a CO436 emulsifier; the non-ionic emulsifier is a mixture of commercially available NP-10 emulsifier and AEO-09 emulsifier; the cross-linking agent is a mixture of N' N-methylene bisacrylamide, diketone acrylamide and glycidyl acrylate; the initiator is a mixture of potassium persulfate and hydrogen peroxide; the filler is a mixture of corn starch and titanium dioxide; the stabilizer is a mixture of sodium phosphate and sodium bicarbonate; the bactericide is a mixture of isothiazolinone and formaldehyde.
(2) And (3) injecting the weighed water into the reaction kettle, starting stirring at a rotating speed of 60 revolutions per minute, adding the weighed polyvinyl alcohol while stirring, heating to 98 ℃, and stirring for 1 hour until the polyvinyl alcohol is completely dissolved to obtain a mixed solution.
(3) And cooling the mixed solution to 30 ℃, and then adding the anionic emulsifier, the nonionic emulsifier, the cross-linking agent and the stabilizer into the mixed solution for mixing to obtain a first mixture.
(4) Adding the vinyl acetate, the vinyl neodecanoate, the n-butyl methacrylate, the hydroxyethyl acrylate and the 2-ethylhexyl acrylate into a head tank, and mixing to obtain a second mixture.
(5) Firstly, 60kg of the second mixture in the head tank is put into the reaction kettle, stirred for 10 minutes for emulsification, and then added with 0.5kg of initiator; then, after the temperature is raised to 80 ℃, the rest second mixture in the head tank is gradually added into the reaction kettle within 5 hours, and 0.1kg of initiator is added every half hour until the rest initiator is completely added; then, the temperature is reduced to 40 ℃, and the filler and the bactericide are added and mixed to obtain the component A.
(6) Weighing a mixture of diphenylmethane diisocyanate and hexamethylene diisocyanate as a component B, and mixing the component A and the component B according to the mass ratio of 100:30 to obtain the polymer emulsion adhesive.
Example 5
This embodiment provides a polymer emulsion adhesive, the method of preparation comprising the steps of:
(1) weighing 100kg of vinyl acetate, 30kg of polyvinyl alcohol, 10kg of vinyl neodecanoate, 100kg of n-butyl methacrylate, 100kg of hydroxyethyl acrylate, 20kg of acrylic acid-2-ethylhexyl ester, 20kg of anionic emulsifier, 20kg of nonionic emulsifier, 5kg of cross-linking agent, 5kg of initiator, 150kg of filler, 5kg of stabilizer, 3kg of bactericide and 432kg of water for later use; wherein, the polyvinyl alcohol is 2488, and the alcoholysis degree is 89%; the anionic emulsifier is a mixture of a commercially available K12 emulsifier, a CO436 emulsifier and a MS-1 emulsifier; the non-ionic emulsifier is a mixture of commercially available OP-10 emulsifier, AEO-09 emulsifier, lauric diethanolamide, sodium alkylphenol ether sulfosuccinate and TX-10 emulsifier; the cross-linking agent is a mixture of glycidyl methacrylate, itaconic acid, maleic anhydride and vinyl trimethoxy silane; the initiator is a mixture of sodium percarbonate, tert-butyl hydroperoxide and azobisisobutyronitrile; the filler is a mixture of kaolin, barite and alumina; the stabilizer is a mixture of sodium hydroxide and saturated concentration ammonia water; the bactericide is a mixture of isothiazolinone, formaldehyde and dimethomorph.
(2) And (3) injecting the weighed water into the reaction kettle, starting stirring at a rotating speed of 60 revolutions per minute, adding the weighed polyvinyl alcohol while stirring, heating to 96 ℃, and stirring for 1 hour until the polyvinyl alcohol is completely dissolved to obtain a mixed solution.
(3) And cooling the mixed solution to 50 ℃, and then adding the anionic emulsifier, the nonionic emulsifier, the cross-linking agent and the stabilizer into the mixed solution for mixing to obtain a first mixture.
(4) Adding the vinyl acetate, the vinyl neodecanoate, the n-butyl methacrylate, the hydroxyethyl acrylate and the 2-ethylhexyl acrylate into a head tank, and mixing to obtain a second mixture.
(5) Firstly, 60kg of the second mixture in the head tank is put into the reaction kettle, stirred for 10 minutes for emulsification, and then added with 2.5kg of initiator; then, after the temperature is raised to 90 ℃, the rest second mixture in the head tank is gradually added into the reaction kettle within 6 hours, and 0.3kg of initiator is added every half hour until the rest initiator is completely added; then, the temperature is reduced to 60 ℃, and the filler and the bactericide are added and mixed to obtain the component A.
(6) And weighing hexamethylene diisocyanate as a component B, and mixing the component A and the component B according to the mass ratio of 100:10 to obtain the polymer emulsion adhesive.
Comparative example 1
This comparative example provides a polymer emulsion adhesive having the same B component and preparation method as example 1, except that: the component A of the polymer emulsion adhesive provided by the comparative example does not contain hydroxyethyl acrylate, vinyl neodecanoate, n-butyl methacrylate and a cross-linking agent component, and all the components are replaced by vinyl acetate.
The polymer emulsion adhesives provided in examples 1 to 3 and comparative example 1 were applied to 7.5cm × 7.5cm × 1.2cm poplar plywood to bond 7.5cm × 7.5cm × 0.2cm eucalyptus bark, respectively, to obtain 4 groups of samples. The 4 groups of panels were subjected to JAS boiling water soaking peel test under the same experimental conditions, and the test results are shown in table 1 below. The JAS boiling water soaking peeling test method comprises the following steps: the template is firstly placed at room temperature for curing for 7 days, then edge cutting is carried out, then the template after edge cutting is placed in boiling water for soaking for 4 hours, then the template is placed in cold water at the temperature of 25 ℃ for soaking for 1 hour, then the template is placed at the temperature of 70 ℃ for drying for 18 hours, and then the glue line condition of the template is observed.
TABLE 1
As shown in Table 1, compared with comparative example 1, the polymer emulsion adhesive prepared by adding hydroxyethyl acrylate, vinyl neodecanoate, n-butyl methacrylate, a crosslinking agent and the like in the examples of the present invention has greatly improved water resistance and heat resistance, and thus, is suitable for various damp-proof and damp-heat resistant environments.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. The polymer emulsion adhesive is characterized by comprising a component A and a component B, wherein the mass ratio of the component A to the component B is 100 (10-30);
the component A comprises the following components in parts by mass: 10-30% of vinyl acetate, 3-8% of polyvinyl alcohol, 1-5% of vinyl neodecanoate, 3-10% of n-butyl methacrylate, 1-10% of hydroxyethyl acrylate, 0.1-2% of 2-ethylhexyl acrylate, 0.1-2% of an anionic emulsifier, 1-2% of a nonionic emulsifier, 0.1-0.5% of a crosslinking agent, 0.1-0.5% of an initiator, 5-15% of a filler, 0.1-0.5% of a stabilizer, 0.1-0.3% of a bactericide and the balance of water, wherein the sum of the mass fractions of the components is 100%;
the component B is isocyanate.
2. The polymer emulsion adhesive according to claim 1, wherein the component A comprises the following components in parts by mass: 15-20% of vinyl acetate, 5-6% of polyvinyl alcohol, 2-3% of vinyl neodecanoate, 5-7.5% of n-butyl methacrylate, 3-5% of hydroxyethyl acrylate, 0.5-1% of 2-ethylhexyl acrylate, 0.5-2% of an anionic emulsifier, 1.5-2% of a nonionic emulsifier, 0.3-0.5% of a cross-linking agent, 0.2-0.5% of an initiator, 5-10% of a filler, 0.1-0.3% of a stabilizer, 0.1-0.15% of a bactericide and the balance of water, wherein the sum of the mass fractions of the components is 100%; the isocyanate is one or more of diphenylmethane diisocyanate, polymethylene polyphenyl isocyanate and hexamethylene diisocyanate.
3. The polymer emulsion adhesive according to claim 1 or 2, wherein the polyvinyl alcohol is one or more of polyvinyl alcohol 1788, polyvinyl alcohol 2088 and polyvinyl alcohol 2488; the alcoholysis degree of the polyvinyl alcohol is 86-89%.
4. A polymer emulsion adhesive as defined in claim 1 or 2 wherein said anionic emulsifier is one or more of sodium lauryl sulfate, sodium vinyl sulfonate, lauric diethanolamide, ethoxylated ammonium alkyl phenol sulfate, sodium alkyl phenol ether sulfosuccinate; the non-ionic emulsifier is one or more of condensate of alkylphenol and ethylene oxide and addition product of fatty alcohol and ethylene oxide.
5. A polymer emulsion adhesive according to claim 1 or 2 wherein the cross-linking agent is one or more of N-methylol acrylamide, N' N-methylene bis acrylamide, bis-keto acrylamide, glycidyl acrylate, glycidyl methacrylate, itaconic acid, maleic anhydride and vinyl trimethoxy silane; the initiator is one or more of ammonium persulfate, potassium persulfate, hydrogen peroxide, sodium percarbonate, tert-butyl hydroperoxide and azobisisobutyronitrile.
6. The polymer emulsion adhesive of claim 1 or 2, wherein the filler is one or more of calcium carbonate, corn starch, titanium dioxide, kaolin, barite, talc and alumina.
7. A polymer emulsion adhesive according to claim 1 or 2 wherein said stabilizer is one or more of sodium acetate, sodium phosphate, sodium carbonate, sodium bicarbonate, sodium hydroxide and saturated ammonia; the bactericide is one or more of benzisothiazolinone, isothiazolinone, formaldehyde and dimethomorph.
8. A method for preparing the polymer emulsion adhesive according to any one of claims 1 to 7, which comprises the following steps:
weighing vinyl acetate, polyvinyl alcohol, vinyl neodecanoate, n-butyl methacrylate, hydroxyethyl acrylate, 2-ethylhexyl acrylate, an anionic emulsifier, a nonionic emulsifier, a cross-linking agent, an initiator, a filler, a stabilizer, a bactericide and water according to the mass fraction for later use;
mixing the polyvinyl alcohol and water at the temperature of 95-98 ℃ to obtain a mixed solution;
mixing the mixed solution with the anionic emulsifier, the nonionic emulsifier, the cross-linking agent and the stabilizer at the temperature of 30-50 ℃ to obtain a first mixture;
mixing the vinyl acetate, the vinyl neodecanoate, the n-butyl methacrylate, the hydroxyethyl acrylate and the 2-ethylhexyl acrylate to obtain a second mixture;
mixing the first mixture, the second mixture and an initiator at the temperature of 80-90 ℃, cooling to 40-60 ℃, adding the filler and a bactericide, and mixing to obtain the component A;
weighing isocyanate as a component B according to the mass ratio of the component A to the component B;
and mixing the component A with the component B to obtain the polymer emulsion adhesive.
9. A polymer emulsion adhesive prepared by the process of claim 8.
10. Use of the polymer emulsion adhesive according to any one of claims 1 to 7 and 9 for wood bonding.
Priority Applications (1)
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| CN114456747A (en) * | 2021-03-12 | 2022-05-10 | 海南必凯水性新材料有限公司 | High-resistance water-blocking composite adhesive and preparation method thereof |
| CN114907806A (en) * | 2022-03-30 | 2022-08-16 | 上海中南建筑材料有限公司 | Plant adhesive for artificial board and preparation method thereof |
| WO2023010602A1 (en) * | 2021-08-03 | 2023-02-09 | 海南赛诺实业有限公司 | High-barrier composite film and preparation method therefor |
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