Preparation of acrylic ester copolymer emulsion for pressure-sensitive adhesive

A pressure-sensitive adhesive, acrylate technology, applied in the direction of ester copolymer adhesives, adhesive types, etc., can solve the problem of not being able to simultaneously achieve initial tack, peeling and holding properties, initial tack and peeling properties. It can reduce the amount of residual glue, improve the initial adhesion, and improve the adhesion.

Active Publication Date: 2009-04-22
HEBEI UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0003] Common emulsion acrylate pressure-sensitive adhesives on the market are mostly polymer-polymer type, and this type of adhesive has the following disadvantages: when the initial adhesion and peeling performance of the pressure-sensitive adhesive are good, the holding performance will be poor; When it is good, the initial adhesion performance and peeling performance will become worse, and the balance of initial adhesion performance, peeling performance and sticking performance cannot be achieved at the same time [M.D.Gower, R.A. Shanks.The effe

Method used

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  • Preparation of acrylic ester copolymer emulsion for pressure-sensitive adhesive
  • Preparation of acrylic ester copolymer emulsion for pressure-sensitive adhesive
  • Preparation of acrylic ester copolymer emulsion for pressure-sensitive adhesive

Examples

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[0026] Example 1

[0027] The preparation of silica-acrylate copolymer emulsion includes the following steps:

[0028]① Preparation of seed emulsion: At 83°C, in a polymerization vessel, dissolve 0.23 g of emulsifier diisooctyl succinate sodium sulfonate with 200 g of water and add 4.96 g of silica hydrosol and stir for 10 minutes, then add 36.6g mass ratio of 1.64% initiator potassium persulfate solution, then kept for 15-25 minutes; the nano silica of the emulsion is silica hydrosol, which can be a commercially available silica hydrosol product or as a polishing After the liquid is used, the silica hydrosol filtered through a 300-mesh screen has a solid content of 42% to 45% and a particle size of 40 to 95 nm.

[0029] ②Pre-emulsification of shell monomer: Divide 10.8g methyl methacrylate into 6 parts according to n×0.72g, n is 0,1,2,3,4,5, add 0.5g acrylic acid to each part, and then Add 106.2g of butyl acrylate to it to form 6 parts of shell monomers, each with a mass of 20g; ...

Example

[0046] Examples 2~3

[0047] Preparation:

[0048] ① Preparation of seed emulsion: same as in Example 1.

[0049] ②Pre-emulsification of shell monomers: 10.8g methyl methacrylate is n×0.72g, n is 5, 4, 3, 2, 1, 0 (for example 2) or n=2.5, 2.5, 2.5 , 2.5, 2.5, and 2.5 (for example 3) are divided into 6 parts, 0.5g acrylic acid is added to each part, and 106.2g butyl acrylate is added to it to form 6 parts of shell monomers. The mass of each shell monomer It is 20g; then 1.6g of emulsifier diisooctyl succinate sodium sulfonate and 0.04g tert-dodecyl mercaptan are mixed and divided into 6 equal parts, and the corresponding 6 parts of the shell layer The mixture is uniformly mixed to form a pre-emulsion; the mass of methyl methacrylate in each pre-emulsion is gradually reduced, that is, a negative gradient, and the quality of methyl methacrylate in each pre-emulsion is constant, that is, uniform. Table 2 shows the change of MMA quality with time in the gradient feeding of Examples 2 t...

Example

[0054] Examples 4~6

[0055] Preparation:

[0056] ① Preparation of seed emulsion: same as in Example 1.

[0057] ②Pre-emulsification of shell monomers: 21.6g methyl methacrylate according to n×1.44g, n is 0, 1, 2, 3, 4, 5 (for example 4) or n is 5, 4, 3 , 2, 1, 0 (for example 5) or n=2.5, 2.5, 2.5, 2.5, 2.5, 2.5 (for example 6) are divided into 6 parts, 0.5g acrylic acid is added to each part, and then 95.40g acrylic acid Butyl ester is added to form 6 parts of shell monomers, each shell monomer mass is 20g; then 1.6g of emulsifier sodium diisooctyl succinate and 0.04g tert-dodecyl mercaptan are mixed After being uniform, it is divided into 6 equal parts and mixed with the corresponding 6 parts of shell monomers to form a pre-emulsion. Table 3 shows the changes of MMA quality with time in the case of Examples 4-6 with gradient feeding.

[0058] ③Shell gradient feeding: At 83°C, 6 parts of the pre-emulsion (20.27g each) prepared in the previous step will be 0,1,2,3,4,5 or n=5,4, 3...

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Abstract

The invention relates to a method for preparing an acrylate polymer emulsion used for a pressure sensitive adhesive, which belongs to an adhesive based on acrylate polymer. The method for preparing the acrylate polymer emulsion used for the pressure sensitive adhesive 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 method adopts the seed emulsion polymerization technology to drip a hard monomer, namely methyl methacrylate (MMA) into the shell layer, so that the concentration is subjected to discontinuous change and the organic-inorganic acrylate polymer emulsion provided with an obvious core-shell structure is prepared, wherein nano silicon dioxide is taken as a core and a copolymer of acrylic ester and acrylic monomers is taken as the shell layer; and the hard monomer of the shell layer is subjected to concentration gradient change. The acrylate polymer emulsion can be used as the pressure sensitive adhesive after drying and film forming; the prepared pressure sensitive adhesive has the advantages of high continuous viscous force and reduction of the residual gum content under the condition of gum peeling; and the initial adhesion and the peeling strength can be improved when the continuous viscous force is larger.

Description

technical field [0001] The technical solution of the present invention relates to an adhesive based on an acrylate copolymer, in particular to a method for preparing an acrylate copolymer emulsion for a pressure-sensitive adhesive. Background technique [0002] Pressure-sensitive adhesives can be prepared by processes such as emulsion polymerization, solution polymerization, heating and melting, and UV curing. However, in recent years, with people's emphasis on environmental protection, safety, energy saving, etc. and the continuous expansion of the application of pressure-sensitive adhesives, pressure-sensitive adhesives have been promoted to develop in the direction of low pollution, energy saving, high performance and multi-functionality, especially in developed countries. After putting forward pollution-free, pollution-free, resource-saving and energy-saving as the prerequisites for developing the adhesive industry, water-based emulsion pressure-sensitive adhesives have ...

Claims

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Application Information

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IPC IPC(8): C08F220/18C08F2/24C08F2/44C08K3/36C09J133/08C08F220/14
Inventor 瞿雄伟杨建光王农跃张愚姚艳梅张广林
Owner HEBEI UNIV OF TECH
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