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Preparation of acrylate polymer emulsion with gradient network structure for pressure-sensitive adhesive

A technology of polymer emulsion and gradient structure, applied in the direction of ester copolymer adhesives, adhesive types, etc., to achieve the effect of improving initial adhesion, large peeling force and holding force, and high conversion rate of reaction monomers

Active Publication Date: 2009-04-22
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acrylate polymer pressure-sensitive adhesive is obtained after the emulsion film is dried

Method used

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  • Preparation of acrylate polymer emulsion with gradient network structure for pressure-sensitive adhesive
  • Preparation of acrylate polymer emulsion with gradient network structure for pressure-sensitive adhesive
  • Preparation of acrylate polymer emulsion with gradient network structure for pressure-sensitive adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation of network gradient structure acrylate polymer emulsion for pressure-sensitive adhesive comprises the following steps:

[0025] ①Preparation of seed emulsion: at 83°C, in a polymerization container, dissolve 0.4g of emulsifier diisooctyl sulfonate sodium succinate in 140g of water evenly, then add 10g of butyl acrylate and stir for 10 minutes, then add 20g of mass ratio Polymerization was initiated for 2% initiator potassium persulfate solution for 1 h.

[0026] ② Pre-emulsification of the shell monomer: Mix 2.18g of emulsifier diisooctyl sulfonate sodium with 185.25g of butyl acrylate and 4.75g of acrylic acid, and take out 95.925g of the mixed solution and 0.075g of chain transfer agent tertiary After dodecyl mercaptan is mixed evenly, it is divided into 6 parts according to n×6.4g, n=0, 1, 2, 3, 4, 5, and it is mixed with the above mixed solution without chain transfer agent respectively, Six pre-emulsions of equal mass were formed, each pre-emulsion...

Embodiment 2～3

[0044] Preparation;

[0045] 1. the preparation of seed emulsion: with embodiment 1.

[0046] ② Pre-emulsification of the shell monomer: Mix 2.18g of emulsifier diisooctyl sulfonate sodium with 185.25g of butyl acrylate and 4.75g of acrylic acid, and take out 95.925g of the mixed solution and 0.075g of chain transfer agent tertiary Dodecyl mercaptan is uniformly mixed according to n × 6.4g, n is 5, 4, 3, 2, 1, 0 (for Example 2) or n=2.5, 2.5, 2.5, 2.5, 2.5, 2.5 (for Embodiment 3) is divided into 6 parts, and it is respectively mixed with the mixed solution that does not add chain transfer agent above, forms 6 parts of pre-emulsion, and the quality of every part of pre-emulsion is 32.043g. The mass of tert-dodecyl mercaptan in each part of pre-emulsion gradually increases, that is, positive gradient, and the quality of tert-dodecyl mercaptan in each part of pre-emulsion is constant, that is, uniform. Table 2 shows the change of tert-dodecylmercaptan quality over time during g...

Embodiment 4～6

[0052] Preparation:

[0053] 1. the preparation of seed emulsion: with embodiment 1.

[0054] ② Pre-emulsification of the shell monomer: Mix 2.18g of emulsifier diisooctyl sulfonate sodium with 185.25g of butyl acrylate and 4.75g of acrylic acid, and take out 95.85g of the mixed solution and 0.15g of chain transfer agent tert- Dodecyl mercaptan is uniformly mixed according to n × 6.4g, n is 0, 1, 2, 3, 4, 5 (for Example 4) or n is 5, 4, 3, 2, 1, 0 (for Embodiment 5) or n=2.5, 2.5, 2.5, 2.5, 2.5, 2.5 (being embodiment 6) is divided into 6 parts, and it is mixed with the mixed solution that does not add chain transfer agent above respectively, forms 6 parts of preliminary Emulsion, the mass of each pre-emulsion is 32.055g. Table 3 shows the change of tertiary dodecyl mercaptan quality with time during gradient feeding in Examples 4-6.

[0055] ③Shell layer gradient feeding: At 83°C, first add 10 g of initiator potassium persulfate solution with a mass ratio of 0.9% to 170.4 g...

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Abstract

The invention relates to a method for preparing an acrylate polymer emulsion which is used for a pressure sensitive adhesive and is provided with a gradient network structure, which relates to an adhesive based on acrylate polymer. The method comprises the following steps: (1) preparation of a seed emulsion; (2) pre-emulsification of shell layer monomers; and (3) gradient feeding of a shell layer. The acrylate polymer emulsion is prepared through dipping a chain-transferring agent, namely tert dodecyl mercaptan (CTA) into the shell layer to make the concentration discontinuously changed in a phasic mode, wherein poly(butyl acrylate) is taken as a core and a copolymer of acrylic ester and acrylic monomers is taken as the shell layer; and the crosslinking density of the network structure of the shell layer shows gradient change. The acrylate polymer emulsion provided with the gradient network structure can be used as the pressure sensitive adhesive after drying and film forming. The method realizes optimization of the performance of the pressure sensitive adhesive, improves the initial adhesion and simultaneously maintains large peeling strength and continuous viscous force.

Description

technical field [0001] The technical solution of the present invention relates to an adhesive based on an acrylate polymer, in particular to a preparation method of an acrylate polymer emulsion with a network gradient structure for a pressure-sensitive adhesive. Background technique [0002] Acrylic pressure-sensitive adhesives mainly include emulsion type and solvent type. Solvent-type pressure-sensitive adhesives were first used. Later, due to the problem of solvent diffusion, since strict environmental management regulations, the production of pressure-sensitive adhesives has gradually shifted from solvent to solvent-based adhesives. In the market demand and growth rate forecast of European adhesives by product classification from 2003 to 2006, water-emulsion adhesives accounted for about 40%, because of their environmental friendliness and multiple selectivity of monomers. showing a rapid upward trend. [0003] In the process of preparing water-emulsion pressure-sensiti...

Claims

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Application Information

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IPC IPC(8): C08F220/18C08F2/24C08F2/38C09J133/08
Inventor 瞿雄伟杨建光王农跃张愚张广林姚艳梅
Owner HEBEI UNIV OF TECH
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