Rewetting repairable modified waterborne white latex and preparation method thereof

A technology for modifying water and white latex, which is applied in the direction of monocarboxylate copolymer adhesives, adhesive types, adhesive additives, etc. It can solve the problems of long cooling time, poor bonding, and failure to produce activated adhesive. Solve problems such as bonding, achieve excellent flexibility and pressure sensitivity, improve wet-state adhesive performance, and improve the effect of initial adhesive positioning performance

Active Publication Date: 2019-02-05
DONGGUAN STAR COSM POLYMER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above vinyl acetate copolymer emulsion products prepared by modification have improved the bond strength, water resistance, heat resistance and other properties of the product, in the actual use process, such as manual veneer, PVC wallpaper, thermal insulation foam, books, etc. In applications such as bookbinding, due to uneven glue application, long cooling time, uneven pressing, etc., especially for some curved surfaces and bonding parts with high tension, poor bonding and blistering of the bonding parts are prone to occur after construction problems, and the poorly bonded parts cannot be repaired through simple treatment methods, resulting in the scrapping of the entire product
This is mainly because the white latex of the prior art can no longer produce the effect of activated bonding through external conditions such as heat, light, moisture, pH, etc. after the moisture volatilizes and solidifies to form a film.

Method used

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  • Rewetting repairable modified waterborne white latex and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A kind of rewetting repairable modified water-based white latex of the present embodiment, the preparation method is as follows (all the following raw materials are by weight):

[0034] Step A, 25 parts of vinyl acetate, 15 parts of butyl acrylate, 6 parts of crosslinking agent and 0.02 part of chain transfer agent dodecane are mixed and stirred evenly to obtain a monomer mixture, which is set aside;

[0035] Step B, take 0.5 part of persulfate initiator, and prepare an aqueous initiator solution with a mass concentration of 2%, for subsequent use;

[0036] Step C. Add 40 parts of deionized water, 13 parts of protective colloidal polyvinyl alcohol and 0.5 parts of nonionic emulsifier into the reactor, start stirring, then raise the temperature to 92°C, fully dissolve for 2 hours, then cool down to 65°C; then, Add 1 part of buffer, 10 carboxyl group-containing polymerizable monomers, and 22% of the total mass of an initiator aqueous solution into the reactor, heat up to ...

Embodiment 2

[0048] A kind of rewetting repairable modified water-based white latex of the present embodiment, the preparation method is as follows (all the following raw materials are by weight):

[0049] Step A, 35 parts of vinyl acetate, 12 parts of butyl acrylate, 5 parts of crosslinking agent and 0.04 part of chain transfer agent dodecane are mixed and stirred evenly to obtain a monomer mixture, which is set aside;

[0050] Step B, get 1.2 parts of persulfate initiator, and prepare an aqueous initiator solution with a mass concentration of 1.5%, for subsequent use;

[0051] Step C, add 35 parts of deionized water, 15 parts of protective colloidal polyvinyl alcohol and 1.5 parts of nonionic emulsifier into the reactor, start stirring, then raise the temperature to 95°C, fully dissolve for 1.5 hours, then cool down to 70°C; then, Add 2.5 parts of buffering agent, 12 parts of carboxyl group-containing polymerizable monomers and an aqueous initiator solution accounting for 26% of the tota...

Embodiment 3

[0064] A kind of rewetting repairable modified water-based white latex of the present embodiment, the preparation method is as follows (all the following raw materials are by weight):

[0065] Step A, 40 parts of vinyl acetate, 7 parts of butyl acrylate, 10 parts of crosslinking agent and 0.03 part of chain transfer agent dodecane are mixed and stirred evenly to obtain a monomer mixture, which is set aside;

[0066] Step B, get 0.8 part of persulfate initiator, and prepare an aqueous initiator solution with a mass concentration of 3%, for subsequent use;

[0067] Step C. Add 45 parts of deionized water, 10 parts of protective colloidal polyvinyl alcohol and 2 parts of nonionic emulsifier into the reactor, start stirring, then raise the temperature to 93°C, fully dissolve for 1.3 hours, then cool down to 68°C; then, Add 0.5 parts of buffering agent, 5 carboxyl group-containing polymerizable monomers and an aqueous initiator solution accounting for 30% of the total mass to the r...

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Abstract

The invention relates to the technical field of waterborne adhesives and in particular relates to rewetting repairable modified waterborne white latex and a preparation method thereof. A formula comprises the following components: 35.0 to 50.0 parts of de-ionized water, 10.0 to 20.0 parts of protective colloid polyvinyl alcohol, 0.5 to 2.5 parts of a non-ionic emulsifier, 0.5 to 2.5 parts of a buffering agent, 0.5 to 1.5 parts of a persulfate initiator, 0.01 to 0.05 part of a chain transfer agent dodecyl mercaptan, 25.0 to 54.0 parts of vinyl acetate, 5.0 to 15.0 parts of butyl acrylate, 5.0 to 15.0 parts of a carboxyl-containing polymerizable monomer, a crosslinking agent and the like. Compared with the prior art, the white latex provided by the invention can be used for realizing secondary adhesion through the effect of water and the technical difficult in the prior art that the white latex cannot be repaired after the white latex is cured into a film is overcome; the wet-state adhesion performance of the white latex is greatly improved; the rewetting repairable modified waterborne white latex has the advantages of rapid rewetting viscosity response, good initial adhesion positioning and high bonding strength.

Description

technical field [0001] The invention relates to the technical field of water-based adhesives, in particular to a rewet repairable modified water-based white latex and a preparation method thereof. Background technique [0002] Polyvinyl acetate emulsion (PVAC) is widely used as an environmentally friendly water-based adhesive for wood, decorative panels, paper products, cloth, thermal insulation materials, cement, etc. Bonding of porous materials such as ceramics and ceramics. [0003] In the prior art, polyvinyl acetate emulsion generally uses polyvinyl alcohol as the protective colloid, which is formed by thermally initiating the polymerization of vinyl acetate monomers by free radicals, and is modified by adding fillers, curing agents, plasticizers, etc. to prepare adhesives. White latex with high strength and good water resistance. For example, the invention patent 201510045195.6 discloses a strong white latex, which uses ethylene glycol dimethacrylate, toluene diisocy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J131/04C09J11/08C09J11/06C08F218/08C08F220/18C08F220/06C08F222/16
CPCC08F218/08C09J11/06C09J11/08C09J131/04C08L71/02C08L5/08C08L29/04C08K5/053C08F220/1804C08F220/06C08F222/16
Inventor 蒋颜平赖淦荷
Owner DONGGUAN STAR COSM POLYMER
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