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Environment-friendly modified white latex and preparation method thereof

A white latex, environmentally friendly technology, applied in applications, coatings, inks, etc., can solve the problems of small steric hindrance of polymer bonding main materials, limited improvement in water resistance of white latex, easy brittleness and hardening of white latex, etc. Achieve the effect of not easy to corrode, improve water resistance, and high cross-linking density

Active Publication Date: 2021-12-28
河北匠工新型建筑材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this kind of improved method has following defects at least: the first, contain a large amount of free formaldehyde in the white latex, and formaldehyde endangers human health, pollutes environment, therefore, the use of formaldehyde modified white latex is restricted; The improvement of water resistance is limited, and the wood boards bonded by formaldehyde-modified white latex will be glued after soaking in water at 30°C for more than 20 hours; thirdly, the steric hindrance of the polymer bonding main material prepared by formaldehyde as a modifier Small, high regularity, easy to crystallize, so that the cured white latex is easy to embrittle and harden, and the bonding strength is reduced

Method used

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  • Environment-friendly modified white latex and preparation method thereof
  • Environment-friendly modified white latex and preparation method thereof
  • Environment-friendly modified white latex and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A kind of environment-friendly modified white latex, its formula is as follows:

[0043] 35g vinyl acetate, 20g polyvinyl alcohol, 36g carboxyl-terminated hyperbranched polyester C301, 7g oxidized starch, 0.1g initiator (sodium persulfate), 3g emulsifier OP-10, 0.05g kaolin (particle size 5 μm), 300g Ionized water;

[0044] Prepared according to the following preparation method:

[0045] S1. Solution preparation:

[0046] Continuously add polyvinyl alcohol to 60g of deionized water, and stir to raise the temperature to 70°C to obtain a polyvinyl alcohol solution, keep it warm for later use;

[0047] Continuously add carboxyl-terminated hyperbranched polyester C301 into 60 g of deionized water, and stir to raise the temperature to 70°C to obtain a carboxyl-terminated hyperbranched polyester solution, which is kept warm for later use;

[0048] Continue to add oxidized starch to 60g of deionized water, and stir to raise the temperature to 40°C to obtain a polyvinyl alco...

Embodiment 2-10

[0052] An environment-friendly modified white latex differs from Example 1 in that: the composition of the raw materials is different, and the specific dosage of each component is shown in the table below.

[0053] Table 2. Composition of modified white latex

[0054] composition Example 1 Example 2 Example 3 Example 4 Example 5 Vinyl acetate / g 35 40 50 40 40 Polyvinyl alcohol / g 20 30 40 36 40 Carboxyl-terminated hyperbranched polyester C301 / g 36 50 64 50 50 Oxidized starch / g 7 14 21 14 14 Sodium persulfate / g 0.1 0.2 0.3 0.2 0.2 OP-10 / g 3 4 5 4 4 Kaolin / g 0.05 0.1 0.15 0.1 0.1 Deionized water / g 300 400 500 400 400 composition Example 6 Example 7 Example 8 Example 9 Example 10 Vinyl acetate / g 40 40 40 40 40 Polyvinyl alcohol / g 40 40 40 40 40 Carboxyl-terminated hyperbranched polyester C301 / g 44 48 48 48 48 Oxidized starch / g 14 14 1...

Embodiment 11-13

[0056] A kind of environment-friendly modified white latex, the difference with embodiment 9 is: the carboxyl number of end carboxyl group hyperbranched polyester is different; wherein the carboxyl number of end carboxyl group hyperbranched polyester in embodiment 11 is 48 / mol; Embodiment The carboxyl number of the carboxyl-terminated hyperbranched polyester in 12 is 12 / mol; the carboxyl number of the carboxyl-terminated hyperbranched polyester in Example 13 is 24 / mol.

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Abstract

The invention relates to the technical field of adhesives, and discloses environment-friendly modified white latex and a preparation method thereof. The environment-friendly modified white latex is prepared from the following raw materials in parts by weight: 35 to 50 parts of vinyl acetate, 20 to 40 parts of polyvinyl alcohol, 36 to 64 parts of carboxyl-terminated hyperbranched polyester, 7 to 21 parts of oxidized starch, 0.1 to 0.3 part of an initiator, 3 to 5 parts of an emulsifier, 0.05 to 0.15 part of an auxiliary agent and 300 to 500 parts of water. The above adhesive prepared by the invention is environment-friendly and non-toxic, and almost no VOC is discharged; and heat resistance, the bonding strength and the low-temperature storage stability are also remarkably improved while water resistance is improved.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to an environment-friendly modified white latex and a preparation method thereof. Background technique [0002] White latex is a widely used water-soluble adhesive, and its main components are polyvinyl acetate and polyvinyl alcohol. Traditional white latex has the advantages of being odorless, non-toxic and not easy to age during construction, so it is widely used in furniture manufacturing, printing and binding, and other fields, as an adhesive between paper, wood, cloth, leather and other objects. However, since polyvinyl acetate is a thermoplastic resin with a low softening point, and polyvinyl alcohol has a high hydroxyl content and good hydrophilicity, the water resistance of white latex is poor, which limits the development of white latex. [0003] In related technologies, aldehydes such as formaldehyde are used as modifiers, and formaldehyde is condensed with polyvinyl al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/02C08F261/04C08F251/00C08F218/08C08F2/24C08F2/44C09D167/00C09D131/04C09D129/04C09D103/10C09D11/04C09D11/06
CPCC08F283/02C08F261/04C08F251/00C08F2/24C08F2/44C09D167/00C09D11/04C09D11/06C08F218/08C08L31/04C08L29/04C08L3/10C08K3/346C08K5/544
Inventor 田玉军
Owner 河北匠工新型建筑材料有限公司
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