Low-solid high-viscosity polyvinyl acetate emulsion and preparation method thereof

A polyvinyl acetate emulsion and high-viscosity technology, applied in the direction of non-polymer adhesive additives, adhesive types, monocarboxylate copolymer adhesives, etc., can solve the problem of low viscosity of emulsion, increased environmental hazards, Affect the appearance of the product, etc.

Active Publication Date: 2020-10-27
广东嘉宝莉科技材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to increase the viscosity and meet the user's requirements, it is necessary to add a large amount of starch and thickener, more than 50-100 kg / ton of starch. Starch not only cannot increase the strength of the emulsion bonding wood, but also has poor storage stability and greatly increases corruption. The risk of mildew will affect the appearance of the product, and will increase more costs and reduce the competitiveness of the product market. At the same time, it will also increase the environmental hazards and reduce the environmental protection performance.
However, if starch is not added, the viscosity of the emulsion is too small, which does not meet the needs of users

Method used

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  • Low-solid high-viscosity polyvinyl acetate emulsion and preparation method thereof
  • Low-solid high-viscosity polyvinyl acetate emulsion and preparation method thereof
  • Low-solid high-viscosity polyvinyl acetate emulsion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0035] This example provides the low-solid and high-viscosity polyvinyl acetate emulsion, prepared from the following raw materials in parts by weight, as shown in Table 1.

[0036] Table 1

[0037]

[0038]

[0039] Among them, the degree of polymerization of polyvinyl alcohol in the above table is 88%, the degree of alkali hydrolysis, the molecular weight is 24000, and the viscosity is about 50 mPa.s, among which BP24 from Changchun, Taiwan, China is preferred.

[0040] The initiator is a peroxide initiator. Ammonium persulfate, industrial grade, is purchased from Shanghai Sanaisi Reagent Co., Ltd. in this embodiment; the crosslinking agent is acrylic acid hydroxy ester crosslinking agent, and methyl Hydroxypropyl acrylate, industrial grade; defoamer selects water-based defoamer in this embodiment, Hemings, W-082 type; Disodium acetate; pH regulator is bicarbonate, sodium bicarbonate is selected in the present embodiment; Emulsifier is selected K12 in the present embo...

Embodiment 1

[0068] The viscosity of the emulsion prepared in Example 1-3 reaches more than 2 times of the industry standard, wherein, the effect of Example 1-2 is remarkable, reaching more than 4 times of the industry standard, and Example 3 is due to the dropwise addition of the monomer mixture in the preparation method The stirring speed and the length of time used are not in the preferred range, which affects the viscosity and compressive shear strength of the emulsion, and its viscosity / mechanical properties are slightly worse than those of Examples 1-2, but still better than those of Comparative Examples. Compared with Example 1, Comparative Example 1 did not add the monomer mixture step by step, which affected the latex particle number and particle size of the emulsion, so the viscosity was low and the mechanical properties were poor; Comparative Example 2 was compared with Example 1, and the monomer mixture was added. When the mixing speed is too fast, the particle size of the emuls...

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Abstract

The invention provides a low-solid high-viscosity polyvinyl acetate emulsion which comprises raw materials, namely vinyl acetate and acrylic acid as monomer mixtures, on the basis of formula optimization, a preparation that the monomer mixtures are added at different steps is implemented, and in addition, the monomer mixtures are stirred and dropped at the same time when the monomer mixtures are added at a second step, so that due to reasonable cooperation of the formula components and the preparation method, a sufficient polymerization reaction can be achieved, the viscosity of the polyvinylacetate emulsion can be greatly increased without starch for thickening, and meanwhile high adhesion strength can be achieved.

Description

technical field [0001] The invention belongs to the field of adhesives, in particular to a low-solid and high-viscosity polyvinyl acetate emulsion and a preparation method thereof. Background technique [0002] Polyvinyl acetate emulsion is a large amount of water-based adhesive, the adhesive layer is flexible, the adhesion is durable, there is no organic solvent, and the adhesion strength is good. It is widely used in interior decoration and wood industry. As the concept of environmental protection is deeply rooted in the hearts of the people, people's requirements for environmental protection are getting higher and higher, and domestic quality standards are also getting higher and higher. The content of formaldehyde and TVOC is strictly limited, and the content of APEO and phthalates is even restricted abroad. However, due to the fact that domestic manufacturers of these products are small and numerous, the technical level is uneven, and there is a phenomenon of low-price ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F218/08C08F220/06C09J131/04C09J11/06
CPCC08F218/08C08L2205/025C09J11/06C09J131/04C08F220/06C08L31/04C08K5/11
Inventor 段相周梁斌林杰生陈俊斌
Owner 广东嘉宝莉科技材料有限公司
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