CN111363500A - Vinyl acetate-acrylic emulsion adhesive for glass chopped strand mats and preparation method thereof - Google Patents
Vinyl acetate-acrylic emulsion adhesive for glass chopped strand mats and preparation method thereof Download PDFInfo
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- CN111363500A CN111363500A CN202010357950.5A CN202010357950A CN111363500A CN 111363500 A CN111363500 A CN 111363500A CN 202010357950 A CN202010357950 A CN 202010357950A CN 111363500 A CN111363500 A CN 111363500A
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- vinyl acetate
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- chopped strand
- glass chopped
- strand mats
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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
-
- 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
-
- 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
- C08F2/38—Polymerisation using regulators, e.g. chain terminating agents, e.g. telomerisation
-
- 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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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
- D04H1/587—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives characterised by the bonding agents used
Abstract
The invention discloses a vinyl acetate-acrylic emulsion adhesive for glass chopped strand mats and a preparation method thereof, wherein the vinyl acetate-acrylic emulsion adhesive comprises the following raw materials in parts by weight: 100 parts of water, 40-80 parts of butyl acrylate, 60-100 parts of vinyl acetate, 1-5 parts of functional monomer, 1-5 parts of protective colloid, 2-8 parts of nonionic emulsifier, 0.1-1 part of oxidant, 0.1-1 part of reducing agent and 0.1-1 part of molecular weight regulator. The invention can obtain the chopped strand mat with soft hand feeling without adding a large amount of plasticizer. Because no plasticizer is added, the yellowing resistance of the emulsion is greatly improved, and the appearance of the emulsion is as bright and white as that of glass fiber.
Description
Technical Field
The invention relates to a vinyl acetate-acrylic emulsion adhesive for glass chopped strand mats and a preparation method thereof.
Background
The glass fiber is an inorganic non-metallic material with excellent performance, and is formed by melting and drawing glass balls or waste glass at high temperature. The glass is changed into hard and brittle characteristics after drawing, so that the strength is greatly improved, and the glass has flexibility. Glass fiber has good adhesion with resin besides the characteristics of high tensile strength, good insulating property, good chemical resistance, stable heat resistance and the like, and is generally used for manufacturing plastic product composite materials, electric insulating materials, circuit substrates and the like.
The glass fiber chopped strand mat is a mat-shaped reinforcing material which is prepared by the processes of lapping, spraying adhesive, heating, cooling and rolling glass fiber strands which are chopped into chopped fibers with a certain length. At present, the glass fiber reinforced plastic composite material is widely applied to glass fiber reinforced plastic structures of pleasure boats, naval vessels, sanitary wares, large-diameter pipelines, various corrosion-resistant storage tanks, light building material structural members, automobiles, light rail trains, furniture, electric appliances, various playground places, sports places, environmental protection equipment, air-conditioning refrigeration equipment and the like in China.
Chopped strand mat binders include both powder binders and emulsion binders. The chopped strand mats made of the powder adhesive are soft, easy to soak, small in rolling radius and convenient to transport, but the bonding strength is not enough, the construction is easy to break, and the powder adhesive causes large dust in workshops in the production process, is harmful to human health and pollutes the environment, so that the using amount of the powder adhesive at home and abroad is gradually reduced. The emulsion type adhesive mainly comprises polyvinyl acetate, polyester emulsion and polyurethane emulsion. The chopped strand mat made of the emulsion adhesive has high tensile strength, is convenient to construct, but has hard hand feeling and slow permeation rate. The emulsion adhesive is diluted by water during production, then is sprayed and dried, and forms adhesion to glass fiber after emulsion film forming, so that no waste water is generated in the production process, no dust is scattered, and little pollution is caused to the environment, so that the dosage of the emulsion is gradually increased.
Most of the commercially available emulsion adhesives are polyvinyl acetate emulsion, polyvinyl alcohol is used as a protective colloid, and the vinyl acetate has a high glass transition temperature, so that the produced chopped strand mat has a hard hand feeling, and a large amount of plasticizer is added in the emulsion formula, so that the chopped strand mat with a soft hand feeling can be obtained. Due to the addition of a large amount of plasticizer, the felt surface is yellow after the chopped strand mat is dried at high temperature, and the appearance of a subsequent glass fiber reinforced plastic product is influenced; and the chopped strand mats are stored in a warehouse for a long time, and the plasticizer can migrate to the mat surface to reduce the bonding strength of the mats.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the vinyl acetate-acrylic emulsion adhesive for the glass chopped strand mat, which has soft hand feeling, bright white appearance and durable bonding strength.
Another object of the present invention is to provide a method for preparing the vinyl acetate-acrylic emulsion adhesive.
In order to achieve the purpose, the vinyl acetate-acrylic emulsion adhesive for the glass chopped strand mat comprises the following raw materials in parts by weight: 100 parts of water, 40-80 parts of butyl acrylate, 60-100 parts of vinyl acetate, 1-5 parts of functional monomer, 1-5 parts of protective colloid, 2-8 parts of nonionic emulsifier, 0.1-1 part of oxidant, 0.1-1 part of reducing agent and 0.1-1 part of molecular weight regulator.
Preferably, the functional monomer is any one of hydroxyethyl acrylate, hydroxypropyl acrylate, acrylic acid and itaconic acid.
Preferably, the protective colloid is one or more of polyvinyl alcohol, hydroxymethyl cellulose, hydroxyethyl cellulose and carboxymethyl cellulose mixed in any proportion.
Preferably, the nonionic emulsifier is any one of fatty alcohol-polyoxyethylene ether, tridecyl alcohol ethoxylate and alkyl polyoxyethylene ether.
Preferably, the oxidizing agent is any one of sodium persulfate, ammonium persulfate, and potassium persulfate.
Preferably, the reducing agent is any one of sodium bisulfite, ferrous sulfate and vitamin C.
Preferably, the molecular weight regulator is n-dodecyl mercaptan.
In addition, the invention also provides a preparation method of the vinyl acetate-acrylic emulsion adhesive for the glass chopped strand mat, which comprises the following steps:
a) weighing the raw materials for later use;
b) dissolving 5 percent of the total amount of the nonionic emulsifier and the formula amount of the protective colloid in formula amount of water, and adding into a reaction kettle;
c) at normal temperature, adding the butyl acrylate, the vinyl acetate, the functional monomer and the molecular weight regulator with the formula ratio into an emulsifying cylinder, and fully and uniformly stirring;
d) heating the reaction kettle to 60-70 ℃, adding an oxidant and a reducer (50% of the mass of the oxidant and 50% of the mass of the reducer, the same below) which account for 5-10% and 50% of the total mass of the mixture obtained in the step c), reacting for 0.5-1 hour at 65-70 ℃, and continuously stirring;
e) keeping the reaction temperature at 65-70 ℃, dropwise adding the mixture left in the step c) and 30% of oxidant and reducer, and controlling dropwise adding for 4-6 hours;
f) after the dripping is finished, heating to 70-75 ℃, and preserving heat for 1-2 hours;
g) continuously adding the rest 20% of the oxidant and the reducer, cooling to 65-70 ℃, and preserving heat for 10-20 minutes;
h) continuously cooling to 40-50 deg.C, and adding the rest nonionic emulsifier.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with the traditional chopped strand mat adhesive which is based on pure vinyl acetate polymerization emulsion and is regulated by adding a plasticizer, the vinyl acetate-acrylic emulsion adhesive of the invention takes butyl acrylate as an internal plasticizing monomer to be copolymerized with vinyl acetate, so that the glass transition temperature of the polymerization emulsion is reduced, a large amount of plasticizer is not required to be added, and the chopped strand mat with soft hand feeling can be obtained. Because no plasticizer is added, the yellowing resistance of the emulsion is greatly improved, and the appearance of the emulsion is as bright and white as that of glass fiber.
2. The vinyl acetate-acrylic emulsion adhesive for chopped strand mats adopts an emulsifying system of the nonionic emulsifier and the protective colloid, and does not generate repulsion with negative ion charges carried on the surfaces of glass fibers, so that a better wetting effect is obtained, and the bonding strength is greatly improved compared with that of the commercially available emulsion. The nonionic emulsifier is added after the synthesis reaction is finished, so that the stability of the emulsion can be improved, the creep property of the emulsion after film forming can be improved, and the softness of the chopped strand mat is improved.
3. The functional monomer and the molecular weight regulator are added into the vinyl acetate-acrylic emulsion adhesive for chopped strand mats, the functional monomer can effectively increase the molecular weight of the emulsion, the higher the molecular weight is, the higher the bonding strength is, but the larger the molecular weight is, the emulsion is easy to be unstable, so that a proper amount of the molecular weight regulator is added, and the molecular weight is ensured to be in a proper range. The functional monomer generates proper crosslinking, so that the adhesive force of the emulsion on glass fiber can be increased, and the film formed by the emulsion can be kept to have durable aging resistance, so that the adhesive strength can be kept for a long time.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below. It should be understood, however, that the description herein of specific embodiments is only intended to illustrate the invention and not to limit the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the terms used herein in the specification of the present invention are for the purpose of describing particular embodiments only and are not intended to limit the present invention.
Example 1
The vinyl acetate-acrylic emulsion adhesive for the glass chopped strand mats comprises the following raw materials in parts by weight: 100 parts of water, 40 parts of butyl acrylate, 95 parts of vinyl acetate, 4 parts of hydroxyethyl acrylate, 2 parts of hydroxyethyl cellulose, 8 parts of tridecyl alcohol ethoxylate, 0.5 part of ammonium persulfate, 0.5 part of sodium bisulfite and 0.4 part of n-dodecyl mercaptan;
the preparation method of the vinyl acetate-acrylic emulsion adhesive for the glass chopped strand mats comprises the following steps:
a) weighing the raw materials for later use;
b) dissolving 5 percent of the total amount of the tridecyl alcohol ethoxylate and the formula amount of hydroxyethyl cellulose in formula amount of water, and adding into a reaction kettle;
c) adding vinyl acetate, butyl acrylate, hydroxyethyl acrylate and n-dodecyl mercaptan into an emulsifying cylinder at normal temperature, and fully and uniformly stirring;
d) heating the reaction kettle to 60 ℃, adding 5 percent of the total mass of the mixture obtained in the step c), 50 percent of the mass of ammonium persulfate and 50 percent of the mass of sodium bisulfite, reacting for 0.5 hour at 65 ℃ and continuously stirring;
e) keeping the reaction temperature at 65 ℃, dropwise adding 30 percent of the mass of the mixture and ammonium persulfate in the step c) and 30 percent of the mass of the sodium bisulfite, and controlling the dropwise adding for 4 hours;
f) after the dropwise addition in the step e) is finished, heating to 70 ℃, and preserving the heat for 1 hour;
g) adding the remaining 20 percent of ammonium persulfate and sodium bisulfite into the mixture obtained in the step f), cooling to 65 ℃, and preserving the temperature for 10 minutes;
h) cooling the mixture prepared in the step g) to 40 ℃, and adding the rest tridecyl alcohol ethoxylate to obtain the vinyl acetate-acrylic emulsion adhesive.
Example 2
The vinyl acetate-acrylic emulsion adhesive for the glass chopped strand mats comprises the following raw materials in parts by weight: 100 parts of water, 50 parts of butyl acrylate, 85 parts of vinyl acetate, 3 parts of acrylic acid, 2 parts of hydroxyethyl cellulose, 7 parts of fatty alcohol-polyoxyethylene ether, 0.5 part of ammonium persulfate, 0.5 part of sodium bisulfite and 0.3 part of n-dodecyl mercaptan;
the preparation method of the vinyl acetate-acrylic emulsion adhesive for the glass chopped strand mats comprises the following steps:
a) weighing the raw materials for later use;
b) dissolving 5 percent of total amount of fatty alcohol-polyoxyethylene ether and hydroxyethyl cellulose with formula amount in water with formula amount, and adding the mixture into a reaction kettle;
c) adding vinyl acetate, butyl acrylate, acrylic acid and n-dodecyl mercaptan into an emulsifying cylinder at normal temperature, and fully stirring until the mixture is uniform;
d) heating the reaction kettle to 60 ℃, adding ammonium persulfate and sodium bisulfite accounting for 5 percent and 50 percent of the total mass of the mixture obtained in the step c), keeping the reaction temperature at 68 ℃ and continuously stirring for 0.5 hour;
e) keeping the reaction temperature at 68 ℃, dropwise adding the mixture remained in the step c) and 30% of ammonium persulfate and sodium bisulfite, and controlling dropwise adding for 5 hours;
f) after the dropwise addition in the step e) is finished, heating to 72 ℃, and preserving heat for 1.5 hours;
g) adding the remaining 20 percent of ammonium persulfate and sodium bisulfite into the mixture obtained in the step f), cooling to 65 ℃, and preserving the temperature for 15 minutes;
h) cooling the mixture prepared in the step g) to 45 ℃, and adding the rest fatty alcohol-polyoxyethylene ether to obtain the vinyl acetate-acrylic emulsion adhesive.
Example 3
A vinyl acetate-acrylic emulsion adhesive for glass chopped strand mats comprises, by mass, 100 parts of water, 50 parts of butyl acrylate, 75 parts of vinyl acetate, 4 parts of hydroxypropyl acrylate, 3 parts of hydroxyethyl cellulose, 8 parts of tridecyl alcohol ethoxylate, 0.5 part of ammonium persulfate, 0.5 part of sodium bisulfite and 0.2 part of n-dodecyl mercaptan;
the preparation method of the vinyl acetate-acrylic emulsion adhesive for the chopped strand mats comprises the following steps:
a) weighing the raw materials for later use;
b) dissolving 5 percent of the total amount of the tridecyl alcohol ethoxylate and the formula amount of hydroxyethyl cellulose in water, and adding into a reaction kettle;
c) at normal temperature, adding the vinyl acetate, butyl acrylate, hydroxypropyl acrylate and n-dodecyl mercaptan into an emulsifying cylinder according to the formula ratio, and fully and uniformly stirring;
d) heating the reaction kettle to 68 ℃, adding ammonium persulfate and 50% of sodium bisulfite which account for 5% and 50% of the total mass of the mixture obtained in the step c), keeping the reaction temperature at 68 ℃, and continuously stirring for 0.8 hour;
e) setting the reaction temperature to be 68 ℃, dropwise adding the rest of the mixture obtained in the step c), 30% of ammonium persulfate and 30% of sodium bisulfite, and controlling dropwise adding for 5 hours;
f) after the dropwise addition in the step e) is finished, heating to 73 ℃, and preserving heat for 1.5 hours;
g) adding the remaining 20 percent of ammonium persulfate and sodium bisulfite into the mixture obtained in the step f), cooling to 68 ℃, and preserving the temperature for 15 minutes;
h) cooling the mixture prepared in the step g) to 45 ℃, and adding the rest tridecyl alcohol ethoxylate to obtain the product.
Example 4
The vinyl acetate-acrylic emulsion adhesive for the glass chopped strand mats comprises the following raw materials in parts by weight: 100 parts of water, 50 parts of butyl acrylate, 75 parts of vinyl acetate, 5 parts of hydroxyethyl acrylate, 4 parts of hydroxymethyl cellulose, 4 parts of tridecyl alcohol ethoxylate, 0.5 part of ammonium persulfate, 0.5 part of sodium bisulfite and 0.8 part of n-dodecyl mercaptan;
the preparation method of the vinyl acetate-acrylic emulsion adhesive for the chopped strand mats comprises the following steps:
a) weighing the raw materials for later use;
b) dissolving 5 percent of the total amount of the tridecyl alcohol ethoxylate and the hydroxymethyl cellulose with the formula amount in water, and adding into a reaction kettle;
c) adding vinyl acetate, butyl acrylate, hydroxyethyl acrylate and n-dodecyl mercaptan into an emulsifying cylinder at normal temperature, and fully stirring the mixture until the mixture is uniform;
d) heating the reaction kettle to 70 ℃, adding ammonium persulfate and sodium bisulfite accounting for 7 percent and 50 percent of the total mass of the mixture obtained in the step c), keeping the reaction temperature at 70 ℃, and continuously stirring for 1 hour;
e) setting the reaction temperature to be 70 ℃, dropwise adding the rest of the mixture obtained in the step c) and 30% of ammonium persulfate and sodium bisulfite, and dropwise adding for 6 hours;
f) after the dropwise addition in the step e) is finished, heating to 75 ℃, and preserving the heat for 2 hours;
g) adding the rest 20% of the oxidant and the reducer into the mixture obtained in the step f), cooling to 70 ℃, and preserving heat for 20 minutes;
h) cooling the mixture prepared in the step g) to 50 ℃, and adding the rest tridecyl alcohol ethoxylate to obtain the vinyl acetate-acrylic emulsion adhesive.
The basic properties of the emulsions prepared in examples 1 to 4 of the present invention are shown in Table 1 below.
TABLE 1 Properties of the emulsions obtained in examples 1 to 4 of the invention
Adhesive performance testing of the invention:
the glass chopped strand mat has the advantages of loss on ignition, tensile breaking strength, styrene solubility, permeation rate in unsaturated polyester and bending strength according to the main test indexes of GB/T17470-2007.
The loss on ignition test results in the sizing amount, the tensile strength tests the bonding strength of the reaction adhesive, the dissolution rate of styrene is the same as the permeation rate of unsaturated polyester, and the bending strength represents the softness of the reaction adhesive and is mainly influenced by the glass transition temperature of the adhesive.
Experimental testing 300g/m of adhesive produced by the inventive examples 1-42Standard grammage glass chopped strand mats were tested for loss on ignition as specified by GN/T9914.2, tensile strength as specified by GB/T6006.2-2003, styrene solubility as specified by GB/T6006.1-2003, unsaturated polyester penetration rate as determined by the target ring method, and flexural strength as specified by GB/T18318.1-2009 ramp method. The data obtained are shown in Table 2 below.
TABLE 2 chopped strand glass mat properties produced by the binders of the present invention
Analysis shows that the chopped strand mat prepared by the invention has bright white appearance without yellowing, and has lower TG value, softer hand feeling and tensile strength reaching above the national standard.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The vinyl acetate-acrylic emulsion adhesive for the glass chopped strand mats is characterized by comprising the following raw materials in parts by mass: 100 parts of water, 40-80 parts of butyl acrylate, 60-100 parts of vinyl acetate, 1-5 parts of functional monomer, 1-5 parts of protective colloid, 2-8 parts of nonionic emulsifier, 0.1-1 part of oxidant, 0.1-1 part of reducing agent and 0.1-1 part of molecular weight regulator.
2. The vinyl acetate emulsion binder for glass chopped strand mats according to claim 1, wherein the functional monomer is any one of hydroxyethyl acrylate, hydroxypropyl acrylate, acrylic acid and itaconic acid.
3. The vinyl acetate emulsion adhesive for glass chopped strand mats according to claim 1, wherein the protective colloid is one or more of polyvinyl alcohol, hydroxymethyl cellulose, hydroxyethyl cellulose and carboxymethyl cellulose mixed in any proportion.
4. The vinyl acetate emulsion adhesive for glass chopped strand mats according to claim 1, wherein the nonionic emulsifier is any one of fatty alcohol-polyoxyethylene ether, tridecyl alcohol ethoxylate, and alkyl polyoxyethylene ether.
5. The vinyl acetate emulsion binder for glass chopped strand mats according to claim 1, wherein the oxidizing agent is any one of sodium persulfate, ammonium persulfate, and potassium persulfate.
6. The vinyl acetate emulsion binder for glass chopped strand mats according to claim 1, wherein the reducing agent is any one of sodium hydrogen sulfite, ferrous sulfate, and vitamin C.
7. The vinyl acetate emulsion binder for glass chopped strand mats according to claim 1, wherein the molecular weight regulator is n-dodecyl mercaptan.
8. A method for preparing a vinyl acetate emulsion binder for glass chopped strand mats according to any of claims 1 to 7, comprising the steps of:
a) weighing the raw materials for later use;
b) dissolving 5 percent of the total amount of the nonionic emulsifier and the formula amount of the protective colloid in formula amount of water, and adding into a reaction kettle;
c) at normal temperature, adding the butyl acrylate, the vinyl acetate, the functional monomer and the molecular weight regulator with the formula ratio into an emulsifying cylinder, and fully and uniformly stirring;
d) heating the reaction kettle to 60-70 ℃, adding an oxidant and a reducer which account for 5% -10% and 50% of the total mass of the mixture obtained in the step c), reacting for 0.5-1 hour at 65-70 ℃, and continuously stirring;
e) keeping the reaction temperature at 65-70 ℃, dropwise adding the mixture left in the step c) and 30% of oxidant and reducer, and controlling dropwise adding for 4-6 hours;
f) after the dripping is finished, heating to 70-75 ℃, and preserving heat for 1-2 hours;
g) continuously adding the rest 20% of the oxidant and the reducer, cooling to 65-70 ℃, and preserving heat for 10-20 minutes;
h) continuously cooling to 40-50 deg.C, and adding the rest 95% nonionic emulsifier.
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| CN114316301A (en) * | 2021-12-27 | 2022-04-12 | 广东银洋环保新材料有限公司 | Acrylic emulsion for curing fibers and preparation method thereof, nylon spray bonded cotton and preparation method thereof, and grinding wheel |
| CN117165224A (en) * | 2023-07-26 | 2023-12-05 | 路盟(山东)环保有限公司 | Composite binder and preparation method thereof |
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| CN117165224B (en) * | 2023-07-26 | 2024-02-20 | 路盟(山东)环保有限公司 | Composite binder and preparation method thereof |
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