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White emulsion with improved water-resistant performance

A technology of white latex and water resistance, which is applied in the field of white latex, can solve the problems of restricting the use environment of white latex, reducing the bonding strength, and insufficient water resistance, so as to achieve the effect of improving the bonding strength and film-forming effect, and improving the water resistance

Inactive Publication Date: 2018-10-19
HEFEI GUANGMIN BUILDING MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, white latex uses polyvinyl alcohol as the protective colloid, which is obtained by polymerization of vinyl acetate through free radical reaction. Its water resistance is poor, it is easy to absorb moisture, and it is easy to open the glue in a humid environment, and the bonding strength will be greatly reduced.
This defect is difficult to meet the requirements of practical applications, and also greatly limits the use environment of white latex.
[0005] Patent application number 201310454274.3 discloses a powder-type white latex and its preparation method; the preparation method of this white latex is simple, the storage stability is high, but the water resistance of the adhesive is still poor; the patent application number 201510045399.X discloses an environmentally friendly White latex, this type of adhesive has better environmental protection performance, but it also has the problem of insufficient water resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of white latex with improved water resistance, according to the parts by mass, the white latex includes the following components: 60 parts of polyvinyl acetate, 15 parts of vinyl acetate, 7 parts of polyvinyl alcohol, 2 parts of ethylene glycol, water resistance modification 6 parts of starch, 3 parts of dibutyl phthalate, 1 part of vinyl tertiary carbonate, 0.4 parts of emulsifier, 0.5 parts of initiator, 12 parts of hydrophobic filler, 2 parts of plasticizer, 2 parts of N-methylolacrylamide parts, 35 parts of water.

[0030] In the present embodiment, the preparation method of water-resistant modified starch is:

[0031] According to the number of parts by mass, 30 parts of cornstarch, 1 part of ammonium persulfate and 100 parts of deionized water were added to the reaction kettle, stirred and heated to 90°C, then 1 part of 5mol / L hydrochloric acid solution was added, and the reaction was kept for 3 hours; The temperature of product is down to room temperature...

Embodiment 2

[0039] A kind of white latex with improved water resistance, according to the parts by mass, the white latex includes the following components: 70 parts of polyvinyl acetate, 20 parts of vinyl acetate, 10 parts of polyvinyl alcohol, 5 parts of ethylene glycol, water resistance modification 10 parts of starch, 6 parts of dibutyl phthalate, 3 parts of vinyl tertiary carbonate, 1.3 parts of emulsifier, 2 parts of initiator, 16 parts of hydrophobic filler, 4 parts of plasticizer, 5 parts of N-methylolacrylamide part, 40 parts of water.

[0040] Among the present invention, the preparation method of water-resistant modified starch is:

[0041] According to the number of parts by mass, 30 parts of cornstarch, 1 part of ammonium persulfate and 100 parts of deionized water were added to the reaction kettle, stirred and heated to 95°C, then 1 part of 5mol / L hydrochloric acid solution was added, and the reaction was kept for 4 hours; The temperature of product is down to room temperatu...

Embodiment 3

[0049] A kind of white latex with improved water resistance, according to the parts by mass, the white latex includes the following components: 65 parts of polyvinyl acetate, 18 parts of vinyl acetate, 8.5 parts of polyvinyl alcohol, 3.5 parts of ethylene glycol, water resistance modification 8 parts of starch, 4.5 parts of dibutyl phthalate, 2.1 parts of vinyl tertiary carbonate, 0.9 parts of emulsifier, 1.2 parts of initiator, 14 parts of hydrophobic filler, 3.5 parts of plasticizer, 4.5 parts of N-methylolacrylamide parts, 37 parts of water.

[0050] Among the present invention, the preparation method of water-resistant modified starch is:

[0051] According to the parts by mass, 30 parts of cornstarch, 1 part of ammonium persulfate and 100 parts of deionized water were added to the reaction kettle, stirred and heated to 93°C, then 1 part of 5mol / L hydrochloric acid solution was added, and the reaction was kept for 3.5 hours; The temperature of the product was lowered to r...

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Abstract

The invention relates to the technical field of an adhesive, in particular to white emulsion with improved water-resistant performance. The white emulsion is prepared from the following ingredients ofpolyvinyl acetate, vinyl acetate, polyvinyl alcohol, glycol, water-resistant modified starch, dibutyl phthalate, vinyl versatate, an emulsifier, an initiator, lyophobic filling materials, a plasticizer, N-hydroxymethyl acrylamide and water, wherein the lyophobic filling materials are mixed inorganic filling materials of nanometer calcium carbonate, roasted kaolin and montmorillonite subjected tohydrophobic modification; the emulsifier is sodium dodecyl benzene sulfonate or sodium oleate; the plasticizer is tributyl citrate or acetyl trioctyl citrate; the initiator is one kind of materials from potassium peroxodisulfate, ammonium persulfate and hydrogen peroxide. The white emulsion has the advantages that the bonding performance is good; the curing time is shorter; the water-resistant performance is excellent; tackless cannot easily occur in the damp environment.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to white latex with improved water resistance. Background technique [0002] White latex, that is, polyvinyl acetate emulsion, is a thermoplastic adhesive produced by emulsion polymerization of vinyl acetate. It was first introduced in 1929 and industrialized in Germany in 1937. It is the most widely used, largest and oldest water-soluble adhesive. One of the adhesives. Among them, the method of polyvinyl acetate emulsion polymerization developed by Farben using polyvinyl alcohol as a protective glue has greatly promoted the development of the polyvinyl acetate emulsion industry. my country began to develop polyvinyl acetate emulsion in the late 1950s, and developed rapidly in the 1970s. The early synthetic white latex mostly used polyvinyl acetate homopolymer emulsion, using polyvinyl alcohol with a degree of hydrolysis of about 80% as the protective colloid, using peroxide as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J151/00C09J151/02C09J11/06C09J11/04
CPCC09J151/003C08K2003/265C08K2201/011C09J11/04C09J11/06C08L51/02C08K9/08C08K9/06C08K3/26C08K3/346C08K5/12
Inventor 黄洋
Owner HEFEI GUANGMIN BUILDING MATERIAL CO LTD
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