A kind of GM graft modified polyvinyl acetate-based reverse core-shell emulsion and preparation method thereof

A polyvinyl acetate-based, graft-modified technology, applied in the direction of graft polymer adhesives, adhesive types, adhesives, etc., can solve the problem of limiting the practical application of emulsion adhesives and affecting the uniformity and stability of emulsions , uneven particle size of latex particles, etc., to achieve the effect of improving the adhesive compressive shear wet strength, regular shape without adhesion, and uniform particle size

Active Publication Date: 2020-05-19
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, styrene contains a rigid benzene ring structure, and there is no active functional group in the monomer. It is coated on the surface of polyvinyl acetate particles, which can improve the strength and water resistance of the latex film, but has a greater impact on the bonding performance of the emulsion.
In addition, hot and humid conditions have a great influence on the wet strength of the adhesive layer, destroying the emulsion adhesive layer, which greatly limits the practical application of emulsion adhesives
The functional modification of latex particles with functional monomers such as N-methylolacrylamide can improve the compressive shear wet strength of the bonded specimens, but the dry strength decreases significantly, and increasing the content of functional monomers will lead to The particle size of latex particles is uneven, and the phenomenon of adhesion between particles affects the uniformity and stability of the emulsion.

Method used

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  • A kind of GM graft modified polyvinyl acetate-based reverse core-shell emulsion and preparation method thereof
  • A kind of GM graft modified polyvinyl acetate-based reverse core-shell emulsion and preparation method thereof
  • A kind of GM graft modified polyvinyl acetate-based reverse core-shell emulsion and preparation method thereof

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specific Embodiment approach 1

[0040] A GMA graft-modified polyvinyl acetate-based reverse core-shell emulsion, said a GMA graft-modified polyvinyl acetate-based reverse core-shell emulsion is mainly composed of a first core layer monomer, a second core Layer monomers, shell monomers, graft monomers, composite emulsifiers, initiators, pH buffers, deionized water, and functional monomers, the parts by weight are respectively 60 to 70 parts by weight of the first core layer Monomer, 10-20 parts of second core layer monomer, 30-40 parts of shell layer monomer, 1-1.2 parts of graft monomer, 5-6 parts of composite emulsifier, 0.4-0.5 parts of initiator Agent, 0.3-0.5 parts of pH buffering agent, 100-125 parts of deionized water, 0.5-10 parts of functional monomer, the first core layer monomer is vinyl acetate, and the second core layer The monomer is butyl acrylate, the shell monomer is styrene, the graft monomer is maleic anhydride, the composite emulsifier is a mixture of PCA507 and PCA078, and the initiator i...

specific Embodiment approach 2

[0054] According to the preparation method of a kind of GMA graft modified polyvinyl acetate base reverse core-shell emulsion described in specific embodiment one, comprises the following steps:

[0055] Step 1. Take a certain mass of the first core monomer, the second core monomer, the shell monomer, the graft monomer, the composite emulsifier, the initiator, the pH buffer, the deionized water , functional monomer, to be used;

[0056] Step 2, after dissolving the weighed initiator and graft monomer respectively in 10-15% of the total mass of deionized water, stand-by;

[0057] Step 3. Add 70-80% of the total mass of deionized water into the reactor, and add the pH buffer and compound emulsifier into the reactor, raise the temperature to 60°C, stir for 30 minutes, and then add the first nuclear layer monomer total 10-20% of the mass, continue to stir and emulsify for 30 minutes, add 30-50% of the total amount of the initiator aqueous solution prepared in step 2, raise the te...

specific Embodiment approach 3

[0065] A GMA graft-modified polyvinyl acetate-based reverse core-shell emulsion, said a GMA graft-modified polyvinyl acetate-based reverse core-shell emulsion is mainly composed of a first core layer monomer, a second core layer monomer, shell monomer, graft monomer, composite emulsifier, initiator, pH buffer, deionized water, and functional monomer. The first core layer monomer is vinyl acetate. The second core monomer is butyl acrylate, the shell monomer is styrene, the graft monomer is maleic anhydride, and the composite emulsifier is a mixture of PCA507 and PCA078. The initiator is ammonium persulfate, and the pH buffer is NaHCO 3 , the functional monomer is glycidyl methacrylate.

[0066] The parts by weight of the first core layer monomer in a kind of GMA graft modified polyvinyl acetate-based reverse core-shell emulsion described in this embodiment is 60 parts by weight, and the parts by weight of the second core layer monomer The number is 10 parts, the parts by weig...

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Abstract

The invention relates to glycidyl methacrylate (GMA) graft modified polyvinyl acetate-based reverse core-shell emulsion and a preparation method thereof, belonging to the technical field of emulsion adhesive. The GMA graft modified polyvinyl acetate-based reverse core-shell emulsion is mainly prepared from a first core layer monomer, a second core layer monomer, a shell layer monomer, a graft monomer, a composite emulsifier, an initiator, a pH buffering agent, deionized water and a functional monomer, wherein the first core layer monomer is vinyl acetate, the second core layer monomer is butylacrylate, the shell layer monomer is styrene, the graft monomer is maleic anhydride, the composite emulsifier is a mixture of PCA507 and PCA078, the initiator is ammonium persulfate, the pH buffer isNaHCO3, and the functional monomer is GMA. The raw materials used in the preparation method are cheap and easy to obtain; the prepared functional monomer GMA modified core-shell composite emulsion type adhesive is non-toxic, harmless and simple in production and use process, and can be directly used as water-based adhesive.

Description

technical field [0001] The invention belongs to the technical field of emulsion adhesives, and in particular relates to a GMA graft-modified polyvinyl acetate-based reverse core-shell emulsion and a preparation method thereof. Background technique [0002] Traditional polyvinylacetate (PVAc)-based emulsion adhesives have disadvantages such as poor water and heat resistance. By constructing a polyvinylacetate-based reverse core-shell structure emulsion, styrene (Styrol, St) can be introduced into the surface of latex particles. A shell polymer that is difficult to carry out traditional copolymerization and has excellent performance, which improves the water resistance, heat resistance and creep resistance of the emulsion, while maintaining the film-forming and adhesive properties of the original emulsion film. Constructing a reverse core-shell structured emulsion with polyvinyl acetate as the core and polystyrene as the shell can significantly improve the compressive shear st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F285/00C08F220/32C08F263/04C08F212/08C08F218/08C08F220/18C08F222/06C09J151/00
CPCC08F218/08C08F263/04C08F285/00C09J151/00C08F222/06C08F220/325C08F220/1804
Inventor 李志国孙嘉星张霄加朝顾继友
Owner NORTHEAST FORESTRY UNIVERSITY
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