High-solid low-viscosity large-particle-size polyvinyl acetate emulsion and preparation method thereof

A technology of polyvinyl acetate and vinyl acetate, applied in the direction of non-polymer adhesive additives, monocarboxylate copolymer adhesives, adhesive types, etc., can solve the problem of particle size and compressive shear strength changes Small size, poor freeze-thaw stability, small particle size, etc., to achieve the effect of improved freeze-thaw stability, narrow particle size distribution, and large average particle size

Pending Publication Date: 2022-02-11
顶立新材料科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (4) Not easy to form skin: High solid content glue is easy to dehydrate and form skin, which will cause the emulsion container to sink to the bottom and form floc or block, which will cause great trouble for later use;
[0008] (5) Formaldehyde-free and environmentally friendly: large particle size emulsions often use N-methylolacrylamide (N-MA) as a crosslinking monomer to improve water resistance when involved in crosslinking, but N-methylolacrylamide often brings Formaldehyde, causing follow-up environmental protection problems;
[0009] At present, the existing high-solid polyvinyl acetate emulsion used in China has disadvantages such as small particle size, high viscosity, low compression shear strength, poor freeze-thaw stability, easy surface crusting, and non-environmental protection.
In order to overcome the defect of high viscosity with high solid content, currently raw materials can only adjust the viscosity by using low-polymerization polyvinyl alcohol (such as 0588, 0488 low-polymerization PVA), so that the viscosity of the emulsion will not be too high as the solid content increases. High, so that it is easy to dissipate heat unevenly due to the sudden increase of viscosity in the production process, and there is a risk of implosion, so the monomer flow rate can only be reduced, the production efficiency is low, and the particle size and compressive shear strength will become smaller accordingly.

Method used

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  • High-solid low-viscosity large-particle-size polyvinyl acetate emulsion and preparation method thereof
  • High-solid low-viscosity large-particle-size polyvinyl acetate emulsion and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Dissolve 1 kg of ammonium sulfate in 50 kg of water to obtain a solution of ammonium sulfuricate A solution of 51 kg polymerization; 0.25 kg of FF6M is dissolved in 20 kg of water, resulting in 20.25 kg polymerization of ammonium sulfuricate B dissolution of the polymerization reaction of the FF6M initiator B solution;

[0030] (2) 330 kg of vinyl acetate, 30 kg tertiar carbonate (Vv10), 5 kg methacrylic acid mix mix and mix, 365 kg mixed monomer A; another 3 kg cross-linked monomer methacrylate hydroxyethylene The ester HEMA is dissolved in 20 kg of water to form a crosslinking monomer solution, and it is made of 23 kg monomer solution B;

[0031] (3) Add 360 kg of water, 1 kg defoamer, 1.2 kg buffer acetate, 2 kg emulsifier GENAPOL X 1005, disperse stirred under 50RAD / min, 35 kg of polyvinyl alcohol 1788, 10 kg of polyvinyl alcohol 2488, stirring dispersed for 10 minutes, warmed to 95 ° C, holding up for 60 minutes, then cooling to 55 ° C, adding 110 kg of vinyl ace...

Embodiment 2

[0035] (1) Dissolve 1.5 kg of ammonium sulfate in 50 kg of water, resulting in a solution of ammonium sulfuricate A solution of 51.5 kg polymerization; 0.4 kg of FF6M is dissolved in 20 kg of water, resulting in a 20.4 kg polymerization of ammonium sulfuricate B dissolution of the polymerization reaction of the FF6M initiator B solution;

[0036](2) 280 kg of vinyl acetate, 40 kg tertiary carbonate (VV10), 10 kg methacrylic acid mixed mix, 330 kg mixed monomer A; another 4 kg crosslinked monomer methacrylate hydroxyethylene The ester HEMA is dissolved in 20 kg of water to form a crosslinking monomer solution, and a 24 kg monomer solution B is made.

[0037] (3) Add 360 kg of water, 1 kg defoamer, 1 kg buffer acetate, and 3 kg of emulsifier GENAPOL X 1005, and stirred under 50RAD / min, 30 kg of polyvinyl alcohol 1788. 15 kg of polyvinyl alcohol 2488, stirred by stirring for 10 minutes, warmed to 95 ° C, heat insulation for 60 minutes, then cooled to 55 ° C, add 150 kg of vinyl ace...

Embodiment 3

[0041] (1) 0.9 kg of ammonium sulfate is dissolved in 50 kg of water, resulting in a solution of ammonium sulfuricate A solution of 50.9 kg of polymerization; dissolving 0.3 kg FF6M in 20 kg of water, resulting in a 20.3 kg polymerization reaction B dissolution of the polymerization reaction of the FF6M initiator B solution;

[0042] (2) 280 kg of vinyl acetate, 35 kg tertiary carbonate (Vv10), 5 kg methacrylic acid mix mix, 320 kg of mixed monomer A; another 6 kg cross-linked monomer methacrylate hydroxyethylene The ester HEMA is dissolved in 20 kg of water to form a crosslinking monomer solution, which is made of 26 kg monomer solution B;

[0043] (3) Add 360 kg of water, 1.5 kg defoamer, 1 kg buffer acetate, 4 kg emulsifier GENAPOL X 1005, dispersed under 50RAD / min, 45 kg of polyvinyl alcohol 1788, After stirring dispersion for 10 minutes, he was warmed to 95 ° C, holding up for 60 minutes, then cooled to 55 ° C, add 150 kg of vinyl acetate generic monomer for monomer emulsio...

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Abstract

The invention discloses a high-solid low-viscosity large-particle-size polyvinyl acetate emulsion and a preparation method thereof, and the emulsion is applied to the technical field of adhesive compounding. The emulsion comprises, in parts by weight, vinyl acetate, vinyl versatate, methacrylic acid, a crosslinking monomer hydroxyethyl methylacrylate (HEMA), deionized water, an emulsifier, polyvinyl alcohol, ammonium persulfate as an initiator, a reducing agent as an initiator, a plasticizer, urea, a defoaming agent and a preservative. According to the invention, a core-shell copolymerization process is adopted, and polymerization is carried out in a manner of early-stage high-bottoming monomers and staged gradual acceleration of rotation speed, so that the emulsion is narrower in particle size distribution, larger in average particle size and lower in viscosity in a later stage; and the defects of small particle size, high viscosity, low compression shear strength, poor freeze-thaw stability, easy surface skinning, aldehyde existence and the like of a traditional high-solid-content polyvinyl acetate emulsion are overcome, and the polyvinyl acetate emulsion has good glue performance and storage stability.

Description

Technical field [0001] The present invention relates to the field of adhesive techniques, and Background technique [0002] Conventional high-containing polyvinyl acetate is used in emulsion compound blending, and has a high bonding strength to acetalproprum emulsion, benzide emulsion, VAE emulsion, has a good water resistance; and calcium carbonate, Corn starch, kaolin and other fillers have good compatible stability, and maintain good fluidity. [0003] High solid low-viscous large particle size polyvinyl acetate emulsion is reflected in the application of the process. [0004] (1) High compression shear strength: requires adhesive to have a good bond strength after compounding the finished product, the greater the particle size, the higher the degree of crosslinking, the higher the cohesive strength; [0005] (2) Low viscosity: large particle size low viscosity poly acetate can make emulsions and powder, plasticizers, resins, solvents, and fluidity can be better, can make high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F218/08C08F218/10C08F220/06C08F220/20C08F2/30C09J131/04C09J11/06
CPCC08F218/08C08F2/30C09J131/04C09J11/06C08F218/10C08F220/06C08F220/20C08K5/21
Inventor 万江叶鹏金汤丽军何琳彭奕诚章伦黄虎
Owner 顶立新材料科技股份有限公司
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