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
CN101412782AActive Publication Date: 2009-04-22HEBEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HEBEI UNIV OF TECH
Publication Date
2009-04-22

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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