CN116042038A - Modified acrylic ester emulsion for water-based barrier coating and preparation method thereof - Google Patents
Modified acrylic ester emulsion for water-based barrier coating and preparation method thereof Download PDFInfo
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- CN116042038A CN116042038A CN202211378770.0A CN202211378770A CN116042038A CN 116042038 A CN116042038 A CN 116042038A CN 202211378770 A CN202211378770 A CN 202211378770A CN 116042038 A CN116042038 A CN 116042038A
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions 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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/24—Homopolymers or copolymers of amides or imides
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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
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/14—Methyl esters, e.g. methyl (meth)acrylate
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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
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D151/00—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
- C09D151/08—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
Abstract
The invention relates to the technical field of water-based barrier coating, in particular to a modified acrylic ester emulsion for water-based barrier coating, which comprises the following components in percentage by weight: 28-35% of acrylic acid monomer, 1-5% of cross-linking acrylic acid monomer, 1-5% of polymerizable emulsifier, 0.1-0.5% of catalyst, 1-5% of curing agent, 3-7% of polyhydroxy polymer and the balance of deionized water. The water-based barrier coating prepared by using the modified acrylic emulsion can replace PE (polyethylene) laminated film, so that the paper base material of the tableware coated with the barrier coating can be pulped and recycled, and the requirements of the paper tableware on the performances of water resistance, oil resistance, heat sealing, anti-adhesion and the like are met.
Description
Technical Field
The invention relates to the technical field of water-based barrier coating, in particular to a modified acrylic ester emulsion for water-based barrier coating and a preparation method thereof.
Background
Reporting data from the international economic collaboration and development organization shows that the global annual waste of plastic products is up to 3.6 million tons, of which less than 10% can be recycled, the remainder being used as plastic waste. These plastic wastes are not degradable, severely pollute the environment, are called white pollution, and become another environmental problem that is secondary to greenhouse gases causing global warming. In the united nations environment conference, the conference passes a resolution to terminate plastic contamination. Therefore, laws and regulations related to plastic limiting and plastic forbidden in China are issued in various countries so as to solve the problem of plastic pollution control.
Under the guidance of national plastic restriction regulation policies, various industries in China begin to search for measures for plastic reduction and replacement, and particularly in the catering industry and the takeaway dining field, the traditional disposable plastic tableware is replaced by disposable paper tableware. The existing disposable paper tableware is designed to cover a PE coating film so as to achieve the effects of water resistance, oil resistance and heat sealing, but the PE coating film is difficult to separate from a paper substrate, so that the paper substrate of the PE coating film cannot be pulped again and is difficult to recycle. The main research direction is to replace PE coating film with water-based barrier coating to coat paper tableware. The aim of research is that the water-based barrier coating can reach or approach to PE coating in the aspects of water resistance, oil resistance, heat sealing property and anti-adhesive property, and the forming process is simple and environment-friendly, so that the paper substrate of the tableware can be recycled by repulping, and the recycling of resources is realized. The water-based resin is a core component of the water-based barrier coating, the prior studied water-based resin is used for preparing the water-based barrier coating, the molding process is simple and environment-friendly, the paper substrate after coating can be pulped and recycled, but the water-proof, oil-proof, heat-sealing and anti-adhesive properties of the coating can not meet the requirements of practical application, and the water-based resin has the defects.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a modified acrylic ester emulsion for water-based barrier coating; the water-based barrier coating prepared by using the modified acrylic emulsion can replace PE (polyethylene) laminated film, so that the paper base material of the tableware coated with the barrier coating can be pulped and recycled, and the requirements of the paper tableware on the performances of water resistance, oil resistance, heat sealing, anti-adhesion and the like are met.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
the modified acrylate emulsion for the water-based barrier coating comprises the following components in percentage by weight: 28-35% of acrylic acid monomer, 1-5% of cross-linking acrylic acid monomer, 1-5% of polymerizable emulsifier, 0.1-0.5% of catalyst, 1-5% of curing agent, 3-7% of polyhydroxy polymer and the balance of deionized water.
Preferably, the acrylic monomer is selected from one or more of MMA (methyl methacrylate), BA (butyl acrylate), 2-EHA (isooctyl acrylate) and MAA (methacrylic acid).
Preferably, the polymerizable emulsifier is selected from one or more of sodium acrylate alkyl polyoxyethylene ether sulfonate, sodium alkyl allyl sulfosuccinate, alkyl allyl sulfosuccinate amine and sodium vinyl sulfonate.
Preferably, the polyhydroxy polymer has the general formula- (CH) 2 -CHX)m-(CH 2 -CHOH) n-, wherein m=50 to 500, n=2000 to 4000, x is-H, -OCOCH 3 、-OCOCH 2 CH 2 OCONa、-SO 3 Na、-OSO 3 Any one of Na.
Preferably, the cross-linking agent is acrylamide, and is selected from one or more of diacetone methacrylamide, acetone butanone methacrylamide and acetone isohexanone methacrylamide.
Preferably, the catalyst is selected from one or more of KPS (potassium persulfate), SPS (sodium persulfate) and APS (ammonium persulfate).
Preferably, the curing agent is selected from one or more of glutaryl hydrazide, adipoyl hydrazide, and suberoyl dihydrazide.
The invention also provides a preparation method of the modified acrylic ester emulsion for the water-based barrier coating, which comprises the following steps:
s1: adding a polymerizable emulsifier and deionized water into a reaction kettle, and heating to 85 ℃;
s2: putting acrylic acid monomer into an emulsifying kettle for emulsification for 30min to obtain a pre-emulsified monomer mixture;
s3: adding 5% of pre-emulsified monomer mixture and 10% of catalyst aqueous solution into a reaction kettle, reacting at 80-85 ℃ for 15min, and preserving heat for 20 min;
s4: controlling the reaction temperature at 80-82 ℃, dripping the rest 95% of pre-emulsified monomer and the rest 90% of catalyst for 4hrs, and preserving the heat for two hours;
s5: cooling to below 50 ℃ and regulating the pH to 7.0-9.0, and then adding a curing agent and a polyhydroxy polymer; detecting indexes, and adjusting the solid content and the viscosity by using pure water;
s6: and (5) discharging and packaging to obtain the modified acrylic ester emulsion for the water-based barrier coating.
The main synthesis mechanism of the invention is as follows: under the protection of a polymerizable emulsifier and the initiation of a persulfate catalyst, an acrylic monomer and an acrylic crosslinking monomer undergo free radical addition polymerization reaction in a deionized water medium to synthesize a high molecular weight acrylic polymer containing crosslinking groups, and then a curing agent and a polyhydroxy polymer are added to compound to obtain the modified acrylic emulsion.
The application has the following beneficial effects: (1) The polymerizable emulsifier can maintain emulsion stability in the emulsion synthesis process, and can be polymerized and anchored in a high polymer chain, so that a dried and fixed coating film has good water resistance, and the defects of dissolution in water and poor water resistance of the coating film caused by free high polymer after the traditional emulsifier is dried and fixed are overcome; (2) The emulsion contains a crosslinking group and can be crosslinked and cured with a curing agent, so that the linear structure of the high polymer is crosslinked into a solid network structure, the coating is endowed with excellent water and oil resistance, and the heat sealing and anti-back adhesion properties of the coating are balanced and compatible; (3) The polyhydroxy polymer endows the polymer with high surface tension, so that the coating has excellent oil resistance; (4) The barrier coating prepared by using the modified acrylic emulsion can replace PE (polyethylene) laminated film, so that the paper base material coated with the barrier coating tableware can be pulped and recycled, and the requirements of the paper tableware on the performances of water resistance, oil resistance, heat sealing, adhesion resistance and the like are met.
Detailed Description
The present invention will be further described with reference to examples, but the scope of the invention as claimed is not limited to the scope expressed by the examples.
Table 1 formulation data table for different examples and comparative examples
The effective concentration of the emulsifiers used in the above examples and comparative examples was about 40%.
Comparative example 4: the only difference from example 3 is that the polymerizable emulsifier in example 3 was replaced with ammonium dodecyl polyoxyethylene ether sulfate.
According to actual needs, any one or a combination of less than three of MMA, BA, 2-EHA and MAA can be selected as the acrylic monomer in the table 1; the polymerizable emulsifier can also be selected from more than two of sodium vinyl sulfonate, sodium acrylate alkyl polyoxyethylene ether sulfonate, sodium alkyl allyl sulfosuccinate and alkyl allyl sulfosuccinate amine; the polyhydroxy polymer has the general formula of- (CH) 2 -CHX)m-(CH 2 -CHOH) n-, wherein m=50 to 500, n=2000 to 4000, x is-H, -OCOCH 3 、-OCOCH 2 CH 2 OCONa、-SO 3 Na、-OSO 3 Any one of Na; the cross-linking agent can also be selected from the combination of more than two of diacetone methacrylamide, acetone butanone methacrylamide and acetone isoacetophenone methacrylamide; the catalyst can also be a combination of more than two of KPS, SPS, AP; the curing agent can also be selected from more than two of adipoyl hydrazine, glutaryl hydrazine and octyl dihydrazide.
Modified acrylate emulsions for aqueous barrier coatings in examples 1 to 4 and comparative examples 1 to 4 were prepared according to the formulations in table 1 and the following preparation methods, respectively, comprising the steps of:
s1: adding a polymerizable emulsifier and deionized water into a reaction kettle, and heating to 85 ℃;
s2: putting acrylic acid monomer into an emulsifying kettle for emulsification for 30min to obtain a pre-emulsified monomer mixture;
s3: adding 5% of pre-emulsified monomer mixture and 10% of catalyst aqueous solution into a reaction kettle, reacting at 80-85 ℃ for 15min, and preserving heat for 20 min;
s4: controlling the reaction temperature at 80-82 ℃, dripping the rest 95% of pre-emulsified monomer and the rest 90% of catalyst for 4hrs, and preserving the heat for two hours;
s5: cooling to below 50 ℃ and regulating the pH to 7.0-9.0, and then adding a curing agent and a polyhydroxy polymer; detecting indexes, and adjusting the solid content and the viscosity by using pure water;
s6: and (5) discharging and packaging to obtain the modified acrylic ester emulsion for the water-based barrier coating.
The solid content of the prepared modified acrylic ester emulsion is between 40% and 45%, and the effective concentration of the emulsifier is about 40%.
The modified acrylic ester emulsions prepared in the above examples 1 to 4 and comparative examples 1 to 4 were prepared into aqueous barrier coatings according to a conventional method for performance testing, wherein the formulation of the barrier coatings is as follows:
table 2 formulation table of different barrier coatings
The water-based barrier coating prepared by the method is coated on a surface with the gram weight of 300g/m 2 Coating the cup base paper with gram weight of 10g/m 2 The coated paper was baked at 120℃for 2 min to give a gummed sample, which was tested for hot water resistance, oil resistance, heat sealing and anti-back-tack properties. Wherein each performance is measuredThe test method is as follows:
and (3) water resistance test: waterproof properties were measured using a Bob absorbency tester according to GB/T1540-2002 determination of paper and paperboard absorbency (Bob method). The invention lists the effects that COBB values measured by the preparation of the modified acrylic ester emulsion obtained in the examples 1-4 into the water-based barrier coating are smaller than 3 and are close to PE film coating, and can meet the waterproof requirements under normal use scenes. In addition, the present invention is also tested using the following relatively intuitive method: 1 sample of the barrier-coated paper prepared as described above was folded and adhered to a box having a bottom side of 100mm and a height of 50mm and laid flat on a dry glass or flat plate lined with filter paper. Hot water at a temperature of (95+ -5) deg.c was poured into the cartridge, water was added to a liquid level of 40mm, and left standing for 30min, and whether or not the pad filter paper on the glass plate or the flat plate had a exuded watermark was observed, and 3 specimens were measured for each specimen.
Oil repellency test: reference standard GB/T22805.2-2008 determination of paper and board lipid resistance, section 2: the surface disassembly method and the T/ZZB 1448-2019 white oil-proof paper for food packaging are used for carrying out oil-proof grade test liquid. The white oil-resistant paper of the barrier coating is prepared by using the modified acrylic emulsion of the coated examples and the comparative examples, and the oil-resistant degree grade is more than or equal to 6 and is 12 at the highest. The method comprises the following steps: the test is carried out by using k it standard oil, and the sample paper coated with the modified acrylic emulsion prepared barrier coating of the invention listed in examples 1-4 can reach the oil-proof grade of 9 without losing light and 10 without leaking, and can meet the great part of oil-proof performance requirements. In addition, the present invention is also tested using the following relatively intuitive method: 1 sample of the barrier-coated paper prepared as described above was folded and adhered to a box having a bottom side of 100mm and a height of 50mm and laid flat on a dry glass or flat plate lined with filter paper. And pouring hot oil with the temperature of (95+/-5) DEG C into the sample box, oiling to 40mm liquid level, standing for 30min, and observing whether exudation oil stains exist on the pad filter paper on the dry glass plate or the flat plate. During the test, oil may seep up the sample, ensuring that the upper port of the cartridge is free of oil, which may otherwise seep out of the upper port, affecting the test results. 3 specimens were measured for each sample.
Heat sealing performance test: 1 paper sample coated with the barrier coating and prepared by the method is cut into strips with the width of more than 15mm, the heat sealing temperature of a heat sealing instrument is adjusted to 180 ℃, the heat sealing temperature of the heat sealing instrument is adjusted to 150 ℃, the heat sealing pressure is adjusted to 250KPa, and the heat sealing time is adjusted to 0.8s. After the heat sealing, the test piece was cut into a test piece having a width of 15mm for use. And after the obtained sample is stable for 4hrs at normal temperature, testing the heat sealing strength by using a tensile testing machine, and under the conditions that the opposite sealing and back sealing strength is more than 3N/15mm and the base paper is required to be broken, the heat sealing requirement of the heat sealing barrier coating can be met.
And (3) carrying out heat-resistant back-adhesion test, namely cutting 1 paper sample coated with the barrier coating prepared by the method into square paper sheets with the length and width of 5cm, stacking the coating surface-to-coating layer (face-to-face) and the paper back surface-to-coating layer (back surface) respectively, pressing by using a 5KG weight, putting the paper sample in a 60 ℃ oven for baking for 2 hours, taking out the paper sample for cooling, and ensuring that the face-to-face and the back surface are not separated under pressure, so that the heat-resistant back-adhesion requirement of the barrier coating can be met.
According to the above detection method, the sample paper coated with the modified acrylic emulsion formulated barrier coating of the above examples and comparative examples was detected, and the test data are as follows:
table 3 table of test data for the formulation of barrier coatings from modified acrylic emulsions of examples and comparative examples
As can be seen from the test data of examples 1 to 4 in Table 3, the modified acrylic emulsion of the present invention has excellent water and oil resistance, heat sealing and anti-back adhesion properties when applied to the aqueous barrier coating.
Comparing example 3 with comparative example 1, it can be seen that: when the formula of the modified acrylic emulsion lacks the crosslinking monomer, the hot water resistance, oil resistance and heat-resistant back-adhesion resistance of the water-based barrier coating are all reduced, which indicates that the crosslinking monomer can improve the hot water resistance, oil resistance and heat-resistant back-adhesion resistance of the water-based barrier coating.
Comparing example 3 with comparative example 2, it can be seen that: when the polyhydroxy polymer is absent in the formula of the modified acrylic emulsion, the oil resistance and heat sealing performance of the water-based barrier coating are reduced, which indicates that the polyhydroxy polymer can improve the oil resistance and heat sealing performance of the water-based barrier coating.
Comparing example 3 with comparative example 3, it can be seen that: when the crosslinking agent and the polyhydroxy polymer are absent in the formula of the modified acrylic emulsion, the hot water resistance, oil resistance, heat sealing and heat back adhesion resistance of the water-based barrier coating are reduced, which means that the hot water resistance, oil resistance, heat sealing and heat back adhesion resistance of the water-based barrier coating can be obviously improved when the crosslinking agent and the polyhydroxy polymer are compounded.
Comparing example 3 with comparative example 4, it can be seen that: the polymerizable emulsifier used in the invention can improve the water resistance of the water-based barrier coating more than the emulsifier used in the prior art.
It can be seen from a combination of comparative example 3 and comparative examples 1 to 4 that: the formulation of the modified acrylic emulsion reduces the water resistance, oil resistance and anti-tack properties of the aqueous barrier coating without using crosslinking monomers and curing agents, or using traditional emulsifiers instead of polymerizable emulsifiers; the formula of the modified acrylic emulsion can reduce the oil resistance of the water-based barrier coating when the polyhydroxy polymer is not used; the comprehensive compound use of the polymerizable emulsifier, the crosslinking monomer, the curing agent and the polyhydroxy polymer can enable the prepared modified acrylic emulsion to replace PE (polyethylene) laminated film when being applied to the water-based barrier coating on the paper tableware, so that the paper substrate of the tableware can be recycled in a repulping way, and the requirements of the paper tableware on the performances of water resistance, oil resistance, heat sealing, anti-adhesion and the like are met.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (8)
1. The modified acrylate emulsion for the water-based barrier coating is characterized by comprising the following components in percentage by weight: 28-35% of acrylic acid monomer, 1-5% of cross-linking acrylic acid monomer, 1-5% of polymerizable emulsifier, 0.1-0.5% of catalyst, 1-5% of curing agent, 3-7% of polyhydroxy polymer and the balance of deionized water.
2. The modified acrylate emulsion for water-based barrier coating according to claim 1, wherein the acrylic monomer is one or more selected from MMA, BA, 2-EHA, MAA.
3. A modified acrylate emulsion for an aqueous barrier coating according to claim 1 wherein said polymerizable emulsifier is selected from one or more of sodium acrylate alkyl polyoxyethylene ether sulfonate, sodium alkyl allyl sulfosuccinate, alkyl allyl sulfosuccinate amine, sodium vinyl sulfonate. .
4. The modified acrylate emulsion for aqueous barrier coating of claim 1 wherein said polyhydroxy polymer has the formula- (CH) 2 -CHX)m-(CH 2 -CHOH) n-, wherein m=50 to 500, n=2000 to 4000, x is-H, -OCOCH 3 、-OCOCH 2 CH 2 OCONa、-SO 3 Na、-OSO 3 Any one of Na.
5. The modified acrylic emulsion for water-based barrier coating according to claim 1, wherein the crosslinking agent is one or more selected from diacetone methacrylamide, acetone butanone methacrylamide, acetone isohexide methacrylamide.
6. A modified acrylate emulsion for aqueous barrier coatings according to claim 1 wherein said catalyst is selected from one or more of KPS, SPS, APS.
7. The modified acrylic emulsion for water-based barrier coating according to claim 1, wherein the curing agent is one or more selected from the group consisting of glutaryl hydrazide, adipoyl hydrazide and octyldihydrazide.
8. A method of preparing a modified acrylate emulsion for an aqueous barrier coating as claimed in any one of claims 1 to 7, comprising the steps of:
s1: adding a polymerizable emulsifier and deionized water into a reaction kettle, and heating to 85 ℃;
s2: putting acrylic acid monomer into an emulsifying kettle for emulsification for 30min to obtain a pre-emulsified monomer mixture;
s3: adding 5% of pre-emulsified monomer mixture and 10% of catalyst aqueous solution into a reaction kettle, reacting for 15mins at 80-85 ℃, and preserving heat for 20mins;
s4: controlling the reaction temperature at 80-82 ℃, dripping the rest 95% of pre-emulsified monomer and the rest 90% of catalyst for 4hrs, and preserving the heat for two hours;
s5: cooling to below 50 ℃ and regulating the pH to 7.0-9.0, and then adding a curing agent and a polyhydroxy polymer; detecting indexes, and adjusting the solid content and the viscosity by using pure water;
s6: and (5) discharging and packaging to obtain the modified acrylic ester emulsion for the water-based barrier coating.
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2022
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| JP2002105383A (en) * | 2000-10-02 | 2002-04-10 | Saiden Chemical Industry Co Ltd | Water-based gas-barrier coating composition and method of producing the same |
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