CN110467891B - Anti-yellowing aqueous adhesive and preparation method thereof - Google Patents
Anti-yellowing aqueous adhesive and preparation method thereof Download PDFInfo
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- CN110467891B CN110467891B CN201910760693.7A CN201910760693A CN110467891B CN 110467891 B CN110467891 B CN 110467891B CN 201910760693 A CN201910760693 A CN 201910760693A CN 110467891 B CN110467891 B CN 110467891B
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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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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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
- C09J129/00—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 alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Adhesives based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Adhesives based on derivatives of such polymers
- C09J129/02—Homopolymers or copolymers of unsaturated alcohols
- C09J129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention discloses a yellowing-resistant water-based adhesive and a preparation method thereof, wherein the yellowing-resistant water-based adhesive is prepared from the following raw materials in parts by weight: 38-48 parts of polyvinyl alcohol, 23-29 parts of water-soluble polyvinyl formal, 28-35 parts of water-based ethylene-vinyl acetate copolymer, 12-16 parts of silicone-acrylic emulsion, 2-4 parts of emulsifier, 3-6 parts of ultraviolet absorbent and 2.5-4 parts of antioxidant; the ultraviolet absorbent is a mixture of 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole and resorcinol monobenzoate. According to the invention, through selecting raw material compositions and optimizing the content of each raw material, the advantages of the raw materials are fully exerted, the raw materials complement each other and promote each other, and the prepared yellowing-resistant waterborne adhesive has good yellowing resistance; the high/low temperature resistance is good; the 180 DEG peeling strength is high.
Description
Technical Field
The invention relates to the field of adhesives, and particularly relates to a yellowing-resistant water-based adhesive and a preparation method thereof.
Background
With the development of industry, the application market of adhesives (glue, or adhesive) is becoming wider and more diversified, and the common adhesives mainly include solvent type, water-based type, hot-melt type, and the like. At present, solvent type products have large dosage, and volatile organic compounds such as benzene, toluene and the like are used as solvents, and the solvents can be directly volatilized into the atmosphere in the using process to pollute the environment and harm the health of workers, so that a plurality of government departments abroad issue laws to limit the use of the volatile organic compounds, and the conversion of an adhesive from a solvent type to a water-based type is inevitable.
The water-based adhesive is one of the oldest products, and in ancient times, people all use water-soluble polymers containing natural substances such as bone glue and casein as adhesives. In recent years, development and research of adhesives have been carried out to make the adhesives safe and pollution-free, particularly to make the adhesives free of solvation, and have promoted development of aqueous adhesives.
The aqueous adhesive is a dispersion medium using water as a high polymer, and is called a water-soluble adhesive when the high polymer is dissolved in water, and is called an aqueous emulsion type adhesive when the high polymer is dispersed in water by the action of an emulsifier. The advantages of the aqueous adhesive are: the environment-friendly, non-toxic, non-flammable and high-solid-content solid-liquid separation membrane is environment-friendly, non-flammable, and can be easily cleaned by using the existing application equipment and equipment.
However, the currently used adhesives have the following problems:
1. the existing adhesive (glue) is easy to change in the sun, and the white color and the light color can turn yellow, for example, the white shoe lining and the vamp (also called as the upper) turn yellow after a period of time, thus the appearance and the quality of the product are seriously influenced and the product is not durable; during storage and transportation, the storage cannot be endured due to the fact that the lamp cannot be exposed to light;
2. the adhesive property is poor, and the performance indexes such as 180-degree peel strength are low.
Disclosure of Invention
In view of the above circumstances, an object of the present invention is to provide a yellowing-resistant aqueous adhesive and a method for producing the same, which can effectively solve the above problems. The yellowing-resistant aqueous adhesive has good yellowing resistance; the high/low temperature resistance is good; the 180 DEG peeling strength is high.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the yellowing-resistant water-based adhesive is prepared from the following raw materials in parts by weight: 38-48 parts of polyvinyl alcohol, 23-29 parts of water-soluble polyvinyl formal, 28-35 parts of water-based ethylene-vinyl acetate copolymer, 12-16 parts of silicone-acrylic emulsion, 2-4 parts of emulsifier, 3-6 parts of ultraviolet absorbent and 2.5-4 parts of antioxidant; the ultraviolet absorbent is a mixture of 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole and resorcinol monobenzoate.
The yellowing-resistant aqueous adhesive disclosed by the invention is prepared by selecting raw materials, optimizing the content of each raw material, and selecting polyvinyl alcohol, water-soluble polyvinyl formal, an aqueous ethylene-vinyl acetate copolymer, a silicone-acrylate emulsion, an emulsifier, an ultraviolet absorbent, an antioxidant and the like in a proper ratio, so that the advantages of the polyvinyl alcohol, the water-soluble polyvinyl formal, the aqueous ethylene-vinyl acetate copolymer, the silicone-acrylate emulsion, the emulsifier, the ultraviolet absorbent, the antioxidant and the like are fully exerted, mutually supplemented and mutually promoted, and the prepared yellowing-resistant aqueous adhesive has good yellowing resistance; the high/low temperature resistance is good; the 180 DEG peeling strength is high.
In the raw material of the yellowing-resistant aqueous adhesive, an ultraviolet absorber (a mixture of 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole and resorcinol monobenzoate) is added in a proper proportion, wherein the 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole can absorb ultraviolet rays with the wavelength of 270-380 nm, has spectral properties, has a certain solubility in water, and can be better added into a raw material system of the yellowing-resistant aqueous adhesive; the adhesive is matched with other components to play a good synergistic effect, so that the yellowing resistance of the yellowing-resistant water-based adhesive is good, the yellowing cannot occur after the adhesive is used for a period of time after the adhesive is applied, the time for keeping the appearance and the quality of a product can be prolonged, and the durability can be improved; the product is resistant to visible light and storage.
In the raw materials of the anti-yellowing water-based adhesive, a proper proportion of water-soluble polyvinyl formal is added to be matched with other components, so that a good synergistic effect is achieved, the high/low temperature resistance of the anti-yellowing water-based adhesive is greatly improved, and the bonding performance (180-degree peel strength) is further improved.
In the raw materials of the anti-yellowing aqueous adhesive, the aqueous ethylene-vinyl acetate copolymer with a proper proportion is added and matched with other components to play a good synergistic effect, so that the adhesive property (180-degree peel strength) of the anti-yellowing aqueous adhesive is obviously improved.
In the raw materials of the anti-yellowing water-based adhesive, the silicone-acrylic emulsion is added in a proper proportion and is matched with other components to play a good synergistic effect, so that the high/low temperature resistance of the anti-yellowing water-based adhesive is greatly improved, and the bonding performance (180-degree peel strength) is further improved; in addition, the water resistance of the yellowing resistant aqueous adhesive of the present invention can be improved.
Preferably, the yellowing-resistant aqueous adhesive is prepared from the following raw materials in parts by weight: 43 parts of polyvinyl alcohol, 26.5 parts of water-soluble polyvinyl formal, 31.5 parts of water-based ethylene-vinyl acetate copolymer, 14 parts of silicone-acrylic emulsion, 3.2 parts of emulsifier, 4.8 parts of ultraviolet absorbent and 3.6 parts of antioxidant; the ultraviolet absorbent is a mixture of 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole and resorcinol monobenzoate.
Preferably, the mass ratio of the 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole to the resorcinol monobenzoate in the mixture of the 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole and the resorcinol monobenzoate is 1: (0.6-0.7).
Preferably, the polyvinyl alcohol is 1799 type polyvinyl alcohol.
Preferably, the emulsifier is cocoamine polyoxyethylene ether.
Preferably, the antioxidant is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester.
The invention also provides a preparation method of the yellowing-resistant water-based adhesive, which comprises the following steps:
A. weighing the following components in parts by weight: polyvinyl alcohol, water-soluble polyvinyl formal, water-based ethylene-vinyl acetate copolymer, silicone-acrylic emulsion, emulsifier, ultraviolet absorbent and antioxidant;
B. mixing polyvinyl alcohol and water-soluble polyvinyl formal, putting the mixture into a stirring and dissolving device, adding deionized water which is 20-25 times of the total weight of the polyvinyl alcohol and the water-soluble polyvinyl formal, gradually heating to 96-98 ℃, and stirring at the rotating speed of 500-800 r/min until the polyvinyl alcohol and the water-soluble polyvinyl formal are completely dissolved;
C. and then cooling to 65-70 ℃, adding the aqueous ethylene-vinyl acetate copolymer, the silicone-acrylic emulsion, the emulsifier, the ultraviolet absorbent and the antioxidant, continuously stirring for 60-90 min, cooling to room temperature, and discharging to obtain the yellowing-resistant aqueous adhesive.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the yellowing-resistant aqueous adhesive disclosed by the invention is prepared by selecting raw materials, optimizing the content of each raw material, and selecting polyvinyl alcohol, water-soluble polyvinyl formal, an aqueous ethylene-vinyl acetate copolymer, a silicone-acrylate emulsion, an emulsifier, an ultraviolet absorbent, an antioxidant and the like in a proper ratio, so that the advantages of the polyvinyl alcohol, the water-soluble polyvinyl formal, the aqueous ethylene-vinyl acetate copolymer, the silicone-acrylate emulsion, the emulsifier, the ultraviolet absorbent, the antioxidant and the like are fully exerted, mutually supplemented and mutually promoted, and the prepared yellowing-resistant aqueous adhesive has good yellowing resistance; the high/low temperature resistance is good; the 180 DEG peeling strength is high.
In the raw material of the yellowing-resistant aqueous adhesive, an ultraviolet absorber (a mixture of 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole and resorcinol monobenzoate) is added in a proper proportion, wherein the 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole can absorb ultraviolet rays with the wavelength of 270-380 nm, has spectral properties, has a certain solubility in water, and can be better added into a raw material system of the yellowing-resistant aqueous adhesive; the adhesive is matched with other components to play a good synergistic effect, so that the yellowing resistance of the yellowing-resistant water-based adhesive is good, the yellowing cannot occur after the adhesive is used for a period of time after the adhesive is applied, the time for keeping the appearance and the quality of a product can be prolonged, and the durability can be improved; the product is resistant to visible light and storage.
In the raw materials of the anti-yellowing water-based adhesive, a proper proportion of water-soluble polyvinyl formal is added to be matched with other components, so that a good synergistic effect is achieved, the high/low temperature resistance of the anti-yellowing water-based adhesive is greatly improved, and the bonding performance (180-degree peel strength) is further improved.
In the raw materials of the anti-yellowing aqueous adhesive, the aqueous ethylene-vinyl acetate copolymer with a proper proportion is added and matched with other components to play a good synergistic effect, so that the adhesive property (180-degree peel strength) of the anti-yellowing aqueous adhesive is obviously improved.
In the raw materials of the anti-yellowing water-based adhesive, the silicone-acrylic emulsion is added in a proper proportion and is matched with other components to play a good synergistic effect, so that the high/low temperature resistance of the anti-yellowing water-based adhesive is greatly improved, and the bonding performance (180-degree peel strength) is further improved; in addition, the water resistance of the yellowing resistant aqueous adhesive of the present invention can be improved.
The preparation method has simple process and simple and convenient operation, and saves manpower and equipment cost.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in connection with specific examples, which should not be construed as limiting the present patent.
The test methods or test methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials, unless otherwise indicated, are conventionally obtained commercially or prepared by conventional methods.
Example 1:
the yellowing-resistant water-based adhesive is prepared from the following raw materials in parts by weight: 38-48 parts of polyvinyl alcohol, 23-29 parts of water-soluble polyvinyl formal, 28-35 parts of water-based ethylene-vinyl acetate copolymer, 12-16 parts of silicone-acrylic emulsion, 2-4 parts of emulsifier, 3-6 parts of ultraviolet absorbent and 2.5-4 parts of antioxidant; the ultraviolet absorbent is a mixture of 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole and resorcinol monobenzoate.
Preferably, the yellowing-resistant aqueous adhesive is prepared from the following raw materials in parts by weight: 43 parts of polyvinyl alcohol, 26.5 parts of water-soluble polyvinyl formal, 31.5 parts of water-based ethylene-vinyl acetate copolymer, 14 parts of silicone-acrylic emulsion, 3.2 parts of emulsifier, 4.8 parts of ultraviolet absorbent and 3.6 parts of antioxidant; the ultraviolet absorbent is a mixture of 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole and resorcinol monobenzoate.
Preferably, the mass ratio of the 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole to the resorcinol monobenzoate in the mixture of the 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole and the resorcinol monobenzoate is 1: (0.6-0.7).
Preferably, the polyvinyl alcohol is 1799 type polyvinyl alcohol.
Preferably, the emulsifier is cocoamine polyoxyethylene ether.
Preferably, the antioxidant is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester.
The embodiment also provides a preparation method of the yellowing-resistant aqueous adhesive, which comprises the following steps:
A. weighing the following components in parts by weight: polyvinyl alcohol, water-soluble polyvinyl formal, water-based ethylene-vinyl acetate copolymer, silicone-acrylic emulsion, emulsifier, ultraviolet absorbent and antioxidant;
B. mixing polyvinyl alcohol and water-soluble polyvinyl formal, putting the mixture into a stirring and dissolving device, adding deionized water which is 20-25 times of the total weight of the polyvinyl alcohol and the water-soluble polyvinyl formal, gradually heating to 96-98 ℃, and stirring at the rotating speed of 500-800 r/min until the polyvinyl alcohol and the water-soluble polyvinyl formal are completely dissolved;
C. and then cooling to 65-70 ℃, adding the aqueous ethylene-vinyl acetate copolymer, the silicone-acrylic emulsion, the emulsifier, the ultraviolet absorbent and the antioxidant, continuously stirring for 60-90 min, cooling to room temperature, and discharging to obtain the yellowing-resistant aqueous adhesive.
Example 2:
the yellowing-resistant water-based adhesive is prepared from the following raw materials in parts by weight: 38 parts of polyvinyl alcohol, 23 parts of water-soluble polyvinyl formal, 28 parts of water-based ethylene-vinyl acetate copolymer, 12 parts of silicone-acrylic emulsion, 2 parts of emulsifier, 3 parts of ultraviolet absorbent and 2.5 parts of antioxidant; the ultraviolet absorbent is a mixture of 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole and resorcinol monobenzoate.
In this embodiment, the mass ratio of 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole to resorcinol monobenzoate in the mixture of 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole and resorcinol monobenzoate is 1: 0.6.
in this example, the polyvinyl alcohol is a 1799 type polyvinyl alcohol.
In this example, the emulsifier is a cocoamine polyoxyethylene ether.
In this example, the antioxidant is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propanoic acid ] pentaerythritol ester.
In this embodiment, the preparation method of the yellowing-resistant aqueous adhesive includes the following steps:
A. weighing the following components in parts by weight: polyvinyl alcohol, water-soluble polyvinyl formal, water-based ethylene-vinyl acetate copolymer, silicone-acrylic emulsion, emulsifier, ultraviolet absorbent and antioxidant;
B. mixing polyvinyl alcohol and water-soluble polyvinyl formal, putting the mixture into a stirring and dissolving device, adding deionized water which is 20 times of the total weight of the polyvinyl alcohol and the water-soluble polyvinyl formal, gradually heating the mixture to 96 ℃, and stirring the mixture at the rotating speed of 500r/min until the polyvinyl alcohol and the water-soluble polyvinyl formal are completely dissolved;
C. and then cooling to 65 ℃, adding the aqueous ethylene-vinyl acetate copolymer, the silicone-acrylic emulsion, the emulsifier, the ultraviolet absorbent and the antioxidant, continuously stirring for 90min, cooling to room temperature, and discharging to obtain the yellowing-resistant aqueous adhesive.
When used, the yellowing-resistant aqueous adhesive and an aqueous curing agent (aqueous isocyanate curing agent) are mixed according to a ratio of 100: 1.5, and the mixture is used immediately after being uniformly mixed.
Example 3:
the yellowing-resistant water-based adhesive is prepared from the following raw materials in parts by weight: 48 parts of polyvinyl alcohol, 29 parts of water-soluble polyvinyl formal, 35 parts of water-based ethylene-vinyl acetate copolymer, 16 parts of silicone-acrylic emulsion, 4 parts of emulsifier, 6 parts of ultraviolet absorbent and 4 parts of antioxidant; the ultraviolet absorbent is a mixture of 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole and resorcinol monobenzoate.
In this embodiment, the mass ratio of 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole to resorcinol monobenzoate in the mixture of 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole and resorcinol monobenzoate is 1: 0.7.
in this example, the polyvinyl alcohol is a 1799 type polyvinyl alcohol.
In this example, the emulsifier is a cocoamine polyoxyethylene ether.
In this example, the antioxidant is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propanoic acid ] pentaerythritol ester.
In this embodiment, the preparation method of the yellowing-resistant aqueous adhesive includes the following steps:
A. weighing the following components in parts by weight: polyvinyl alcohol, water-soluble polyvinyl formal, water-based ethylene-vinyl acetate copolymer, silicone-acrylic emulsion, emulsifier, ultraviolet absorbent and antioxidant;
B. mixing polyvinyl alcohol and water-soluble polyvinyl formal, putting the mixture into a stirring and dissolving device, adding deionized water which is 25 times of the total weight of the polyvinyl alcohol and the water-soluble polyvinyl formal, gradually heating the mixture to 98 ℃, and stirring the mixture at the rotating speed of 800r/min until the polyvinyl alcohol and the water-soluble polyvinyl formal are completely dissolved;
C. and then cooling to 70 ℃, adding the aqueous ethylene-vinyl acetate copolymer, the silicone-acrylic emulsion, the emulsifier, the ultraviolet absorbent and the antioxidant, continuously stirring for 60min, cooling to room temperature, and discharging to obtain the yellowing-resistant aqueous adhesive.
When used, the yellowing-resistant aqueous adhesive and an aqueous curing agent (aqueous isocyanate curing agent) are mixed according to a ratio of 100: 1.5, and the mixture is used immediately after being uniformly mixed.
Example 4:
the yellowing-resistant water-based adhesive is prepared from the following raw materials in parts by weight: 43 parts of polyvinyl alcohol, 26.5 parts of water-soluble polyvinyl formal, 31.5 parts of water-based ethylene-vinyl acetate copolymer, 14 parts of silicone-acrylic emulsion, 3.2 parts of emulsifier, 4.8 parts of ultraviolet absorbent and 3.6 parts of antioxidant; the ultraviolet absorbent is a mixture of 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole and resorcinol monobenzoate.
In this embodiment, the mass ratio of 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole to resorcinol monobenzoate in the mixture of 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole and resorcinol monobenzoate is 1: 0.66.
in this example, the polyvinyl alcohol is a 1799 type polyvinyl alcohol.
In this example, the emulsifier is a cocoamine polyoxyethylene ether.
In this example, the antioxidant is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propanoic acid ] pentaerythritol ester.
In this embodiment, the preparation method of the yellowing-resistant aqueous adhesive includes the following steps:
A. weighing the following components in parts by weight: polyvinyl alcohol, water-soluble polyvinyl formal, water-based ethylene-vinyl acetate copolymer, silicone-acrylic emulsion, emulsifier, ultraviolet absorbent and antioxidant;
B. mixing polyvinyl alcohol and water-soluble polyvinyl formal, putting the mixture into a stirring and dissolving device, adding deionized water which is 22 times of the total weight of the polyvinyl alcohol and the water-soluble polyvinyl formal, gradually heating the mixture to 97 ℃, and stirring the mixture at the rotating speed of 650r/min until the polyvinyl alcohol and the water-soluble polyvinyl formal are completely dissolved;
C. and then cooling to 68 ℃, adding the aqueous ethylene-vinyl acetate copolymer, the silicone-acrylic emulsion, the emulsifier, the ultraviolet absorbent and the antioxidant, continuously stirring for 80min, cooling to room temperature, and discharging to obtain the yellowing-resistant aqueous adhesive.
When used, the yellowing-resistant aqueous adhesive and an aqueous curing agent (aqueous isocyanate curing agent) are mixed according to a ratio of 100: 1.5, and the mixture is used immediately after being uniformly mixed.
Comparative example 1:
the difference from example 4 is that no ultraviolet absorber is present, and the other is the same as example 4.
Comparative example 2:
the difference from example 4 is that no 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole is present, and the other is the same as example 4.
Comparative example 3:
the difference from example 4 is that resorcinol monobenzoate is absent, and the rest is the same as example 4.
Comparative example 4:
the difference from example 4 is that there is no water-soluble polyvinyl formal, and the rest is the same as example 4.
Comparative example 5:
the difference from example 4 is that there is no aqueous ethylene-vinyl acetate copolymer, and the other is the same as example 4.
Comparative example 6:
the difference from example 4 is that there is no silicone-acrylic emulsion, and the rest is the same as example 4.
The following performance tests were performed on the yellowing-resistant aqueous adhesives obtained in examples 2 to 4 of the present invention and the adhesives obtained in comparative examples 1 to 6, and the test methods were as follows: (1) high/low temperature resistance: baking the bonded white shoe lining and vamp at 60 ℃ for 72 hours, freezing at-10 ℃ for 72 hours, and observing the bonding condition; (2) yellowing resistance: keeping the bonded white shoe lining and the bonded shoe upper at the temperature of 120 ℃ for 60min, and then observing whether the shoes are yellowed or not; the test results are shown in table 1.
TABLE 1
As can be seen from the above table, the yellowing resistant aqueous adhesive of the present invention has the following advantages: the yellowing resistance is good; the high/low temperature resistance is good; the 180 DEG peeling strength is high.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (3)
1. The preparation method of the yellowing-resistant water-based adhesive is characterized in that the yellowing-resistant water-based adhesive is prepared from the following raw materials in parts by weight: 38-48 parts of polyvinyl alcohol, 23-29 parts of water-soluble polyvinyl formal, 28-35 parts of water-based ethylene-vinyl acetate copolymer, 12-16 parts of silicone-acrylic emulsion, 2-4 parts of emulsifier, 3-6 parts of ultraviolet absorbent and 2.5-4 parts of antioxidant; the ultraviolet absorber is a mixture of 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole and resorcinol monobenzoate, and the mass ratio of the 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole to the resorcinol monobenzoate is 1: (0.6-0.7); the polyvinyl alcohol is 1799 type polyvinyl alcohol; the emulsifier is coconut oil amine polyoxyethylene ether; the antioxidant is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester; the preparation method comprises the following steps:
A. weighing the following components in parts by weight: polyvinyl alcohol, water-soluble polyvinyl formal, water-based ethylene-vinyl acetate copolymer, silicone-acrylic emulsion, emulsifier, ultraviolet absorbent and antioxidant;
B. mixing polyvinyl alcohol and water-soluble polyvinyl formal, putting the mixture into a stirring and dissolving device, adding deionized water which is 20-25 times of the total weight of the polyvinyl alcohol and the water-soluble polyvinyl formal, gradually heating to 96-98 ℃, and stirring at the rotating speed of 500-800 r/min until the polyvinyl alcohol and the water-soluble polyvinyl formal are completely dissolved;
C. and then cooling to 65-70 ℃, adding the aqueous ethylene-vinyl acetate copolymer, the silicone-acrylic emulsion, the emulsifier, the ultraviolet absorbent and the antioxidant, continuously stirring for 60-90 min, cooling to room temperature, and discharging to obtain the yellowing-resistant aqueous adhesive.
2. An anti-yellowing aqueous adhesive prepared by the preparation method of claim 1.
3. The yellowing-resistant aqueous adhesive according to claim 2, wherein the yellowing-resistant aqueous adhesive is prepared from the following raw materials in parts by weight: 43 parts of polyvinyl alcohol, 26.5 parts of water-soluble polyvinyl formal, 31.5 parts of water-based ethylene-vinyl acetate copolymer, 14 parts of silicone-acrylic emulsion, 3.2 parts of emulsifier, 4.8 parts of ultraviolet absorbent and 3.6 parts of antioxidant.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001207144A (en) * | 2000-01-27 | 2001-07-31 | Taoka Chem Co Ltd | Hot-melt adhesive composition |
| CN102618142A (en) * | 2012-04-12 | 2012-08-01 | 烟台大学 | Method for preparing lightproof paint |
| CN106281121A (en) * | 2016-08-10 | 2017-01-04 | 佛山市三水永恒达粘合剂有限公司 | A kind of water-based adhesive for solar cell backboard and preparation method thereof |
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