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Polyvinyl acetate emulsion and preparation method thereof

A technology of polyvinyl acetate emulsion and ethylene copolymer, which is applied in the direction of monocarboxylate copolymer adhesives, non-polymer adhesive additives, adhesive types, etc., can solve the problem of harming human hormone function and affecting health , reduce the strength of the adhesive layer, etc., and achieve the effect of simple and easy to operate preparation method, suitable for large-scale production, and low TVOC

Active Publication Date: 2021-11-26
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

Formaldehyde and TVOC have the risk of carcinogenicity, APEO has a toxic impact on the environment, both APEO and phthalates have estrogen-like effects, which endanger human hormone function
If these harmful polymer emulsions are used for wood and interior decoration, the human body will be adversely affected for a long time within several years, affecting the health of the body, and in severe cases can lead to serious diseases
[0004] Moreover, in the production process of polyvinyl acetate emulsion, it is generally necessary to add plasticizers to soften the dry glue layer and increase its flexibility. However, plasticizers have mobility, and polyvinyl acetate emulsions are used as water-based adhesives to form glue. After layering, the plasticizer will slowly migrate to the surface of the adhesive layer, thereby reducing the strength of the adhesive layer, and the plasticizer will also pollute the external environment

Method used

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  • Polyvinyl acetate emulsion and preparation method thereof
  • Polyvinyl acetate emulsion and preparation method thereof
  • Polyvinyl acetate emulsion and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0051] The preparation method of polyvinyl acetate emulsion is as follows:

[0052] Mixing the vinyl acetate and acrylic acid to obtain a monomer mixture;

[0053] adding the polyvinyl alcohol into water, heating to dissolve, lowering the temperature, adding sodium lauryl sulfate and a part of the monomer mixture, and polymerizing at heat preservation to obtain the first system;

[0054] Add the remaining part of the monomer polymer dropwise to the first system and keep warm to obtain the second system;

[0055] Add the ethylene glycol diacetate and antifreeze to the second system, vacuumize, add vinyl acetate-ethylene copolymer, mix evenly, and obtain.

[0056] It can be understood that according to the conventional use method of auxiliary agents, auxiliary agents such as crosslinking agent, initiator, pH regulator, chelating agent, reducing agent and preservative can be appropriately added in the above preparation method.

Embodiment 1-3

[0058] With reference to the raw materials and dosages in Table 1, and with reference to the following preparation methods and the process parameters in Table 2, the polyvinyl acetate emulsions of Examples 1-3 were prepared.

[0059] Table 1

[0060]

[0061] The preparation method of polyvinyl acetate emulsion is as follows:

[0062] (1) Mix vinyl acetate and acrylic acid at room temperature and stir slightly to obtain a monomer mixture;

[0063] (2) Add polyvinyl alcohol and defoamer to water in sequence, start stirring, heat up to 90°C-95°C and keep it warm for 1h-3h;

[0064] (3) Cool down to 70°C to 85°C, add initiator, chelating agent, crosslinking agent, sodium lauryl sulfate, pH regulator and a part of the monomer mixture in sequence, the part of the monomer mixture accounts for the monomer 15% to 45% of the total mass of the mixture, heat preservation reaction for 20min to 60min;

[0065] (4) Add the remaining monomer mixture dropwise to the above system while s...

Embodiment 1 and Embodiment 4-8

[0072] With reference to the raw materials and consumption of Table 3, and using the same preparation method and process parameters as in Example 1, the polyvinyl acetate emulsion of Example 4-7 was prepared, and with reference to the raw materials and consumption of Example 8 of Table 3, the polyvinyl acetate emulsion of Example 8 was prepared. Polyvinyl acetate emulsion, wherein, in the preparation method, omit the step of vacuumizing in step (6), other steps are identical with embodiment 1.

[0073] table 3

[0074]

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Abstract

The invention relates to a polyvinyl acetate emulsion and a preparation method thereof. The polyvinyl acetate emulsion is prepared from raw materials comprising the following parts by weight: 15-35 parts of vinyl acetate; 0.1-0.7 parts of acrylic acid; 1-25 parts of vinyl acetate-ethylene copolymer; 0.6 parts of ethylene glycol diacetate ‑4 parts; 3‑9 parts of polyvinyl alcohol; 0.01‑0.4 parts of sodium lauryl sulfate; 0.01‑0.7 parts of antifreeze; 0.1‑5 parts of additives; 45‑75 parts of water. In the polyvinyl acetate emulsion, the content of formaldehyde and TVOC is less than the national standard, does not contain APEO and phthalate, and meets the foreign limit standard.

Description

technical field [0001] The invention relates to the field of water-based adhesives, in particular to polyvinyl acetate emulsion and a preparation method thereof. Background technique [0002] At this stage, people have higher and higher requirements for environmental protection, and national environmental protection policies are becoming more and more strict. Domestic quality standards strictly limit the content of formaldehyde and TVOC, and foreign countries even limit the content of APEO and phthalates. [0003] As a water-based adhesive, polyvinyl acetate emulsion is widely used in home decoration, wood bonding, paper lamination, etc. It is characterized by flexible adhesive layer, long-lasting bonding and good bonding strength. However, at present, in the process of producing polyvinyl acetate emulsion, APEO and phthalates will be added to produce harmful substances such as formaldehyde and TVOC. Moreover, because domestic manufacturers of these products are small and nu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F218/08
CPCC08F2/26C08F218/08C08K2003/162C08L2205/025C09J11/04C09J11/06C09J131/04C08L31/04C08K3/16C08K5/05C08K5/11C08F220/06C08F220/281
Inventor 段相周程俊林杰生林嘉乐
Owner 广东嘉宝莉科技材料有限公司
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