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Styrene modified polyvinyl acetate emulsion and preparation method

The technology of polyvinyl acetate and styrene is applied in the field of styrene-modified polyvinyl acetate emulsion and its preparation, which can solve the problems of difficult copolymerization and compounding, poor resistance to boiling water, etc., and achieves simple process, low cost and stable system. Effect

Inactive Publication Date: 2015-02-25
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to overcome the technical deficiencies such as the poor boiling water resistance of the existing polyvinyl acetate emulsion and difficult copolymerization and compounding with styrene, and provide a single-component styrene-modified polyvinyl acetate that is resistant to boiling water and has no pollution. Emulsion adhesive and preparation method thereof

Method used

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  • Styrene modified polyvinyl acetate emulsion and preparation method
  • Styrene modified polyvinyl acetate emulsion and preparation method
  • Styrene modified polyvinyl acetate emulsion and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Styrene modified polyvinyl acetate emulsion adhesive of the present invention is prepared from according to the raw material of following weight percent:

[0032] Deionized water: 58-62%; polyvinyl alcohol: 2-10%; mixed monomer 1: 20-35%; mixed monomer 2: 4-20%; compound emulsifier: 0.6-2%; pH buffer : 0.1~0.5%; Initiator: 0.1~1%.

[0033] Concrete preparation method is as follows:

[0034] (1) Reagent treatment

[0035] Dissolve the persulfate initiator at 40°C, filter, cool the filtrate with ice, crystallize out, filter, wash the crystals with ice-cold water, wash with BaCl 2 Solution check until the washing solution is free of precipitation. Dry the white columnar or plate-shaped crystals in a vacuum desiccator and store them for future use;

[0036] (2) Preparation of styrene-modified polyvinyl acetate emulsion

[0037] 1. Monomer mixing

[0038] Mixed monomer 1: mixed vinyl acetate and alkyl acrylate (the total amount of mixed monomer 1 is based on 100% by ma...

Embodiment 2

[0059] Styrene modified polyvinyl acetate emulsion adhesive (PVAc-1) of the present invention is prepared from according to the raw material of following weight percent:

[0060] Deionized water: 58.4%; polyvinyl alcohol: 2.5%; mixed monomer 1: 31.6%; mixed monomer 2: 5.8%; complex emulsifier: 1.2%; pH buffer: 0.3%; initiator: 0.2%.

[0061] Among them, mixed monomer 1 is formed by mixing vinyl acetate and butyl acrylate, and the proportion is 90% of vinyl acetate and 10% of butyl acrylate; mixed monomer 2 is formed by mixing styrene and butyl acrylate, and the proportion is It is 78% styrene and 22% butyl acrylate.

[0062] The compound emulsifier is alkylphenol polyoxyethylene ether and sodium lauryl sulfate, the ratio is 7:2; the initiator is potassium persulfate; the pH buffer is sodium bicarbonate; the polyvinyl alcohol is 1788 type.

[0063] Above-mentioned styrene-modified polyvinyl acetate emulsion adhesive is prepared according to the following method:

[0064] 1. M...

example 3

[0072] Styrene modified polyvinyl acetate emulsion adhesive (PVAc-2) of the present invention is prepared from according to the raw material of following weight percent:

[0073] Deionized water: 62%; polyvinyl alcohol: 2.7%; mixed monomer 1: 27.6%; mixed monomer 2: 5.2%; complex emulsifier: 1.9%; pH buffer: 0.4%; initiator: 0.2%.

[0074] Among them, mixed monomer 1 is formed by mixing vinyl acetate and butyl acrylate, and the proportion is 80% of vinyl acetate and 20% of butyl acrylate; mixed monomer 2 is formed by mixing styrene and butyl acrylate, and the proportion is It is 88% styrene and 12% butyl acrylate.

[0075] The composite emulsifier is alkylphenol polyoxyethylene ether and sodium dodecylsulfonate, the ratio is 2:1; the initiator is ammonium persulfate; the pH buffer is sodium carbonate; the polyvinyl alcohol is 1788 type.

[0076] Above-mentioned styrene-modified polyvinyl acetate emulsion adhesive is prepared according to the following method:

[0077] 1. Mon...

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Abstract

The invention relates to a styrene modified polyvinyl acetate emulsion and a preparation method, and relates to the modified polyvinyl acetate emulsion and the preparation method. The styrene modified polyvinyl acetate emulsion comprises the following raw materials by weight: 58-62% of deionized water, 2-10% of polyving akohol, 20-35% of mixed monomer 1, 4-20% of mixed monomer 2, 0.6-2% of compound emulsifier, 0.1-0.5% of pH buffering agent and 0.1-1% of initiator. The preparation method employs a staging polymerization mode, in a first stage, vinyl acetate monomer is polymerized to form a polymer seed; in a second stage, a styrene monomer is polymerized in the polymer seed to form emulsion particles with a two-phase separation structure. According to the invention, the process is simple, the cost is low, the boiling water resistance performance of the polyvinyl acetate emulsion is increased, no environmental pollution is generated, and cold pressure curing at normal temperature, and the styrene modified polyvinyl acetate emulsion can be directly used as aqueous adhesives.

Description

technical field [0001] The invention relates to a modified polyvinyl acetate emulsion and a preparation method thereof, in particular to a styrene-modified polyvinyl acetate emulsion and a preparation method thereof. Background technique [0002] Emulsion adhesives are environmentally friendly adhesives because of their excellent environmental performance, so they are widely used in wood processing, civil engineering, paper processing, packaging and bookbinding industries. Polyvinyl acetate-based emulsion adhesive, commonly known as emulsion glue, is an environmentally friendly emulsion adhesive because of its low cost, simple production, good process performance, convenient use, and no environmental pollution. It is widely used in furniture manufacturing, interior decoration, floor laying and gluing. Wood is used more and more widely. [0003] However, due to the complex components in emulsion polymerization and the influence of polyvinyl acetate molecular segment structur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J131/04C08F218/08C08F220/14C08F220/18C08F220/06C08F212/08C08F2/30C08F2/26
Inventor 顾继友白龙李志国
Owner NORTHEAST FORESTRY UNIVERSITY
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