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Aqueous pressure-sensitive adhesive of rosin modified acrylate-styrene multi-block copolymer and preparation process thereof

A multi-block copolymer and acrylate technology, applied in the field of pressure-sensitive adhesives, can solve the problem of inability to take into account macro-adhesive properties such as initial tack, stickiness, peel strength, unsatisfactory molecular structure design, and little change in peel strength, etc. question

Active Publication Date: 2020-05-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The synthesis of common water-based pressure-sensitive adhesives is mainly the random copolymerization of acrylate monomers, which cannot take into account macroscopic adhesive properties such as initial tack, stickiness, and peel strength.
Rosin is used as a tackifying resin for the modification of water-based pressure-sensitive adhesives. At present, the most common method is to use rosin as a small-molecule tackifying emulsion to improve the macroscopic adhesive properties of water-based pressure-sensitive adhesives by blending, but This method is not ideal in terms of molecular structure design. The initial viscosity of the water-based pressure-sensitive adhesive prepared by blending is improved to a certain extent, but the peel strength does not change much.

Method used

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  • Aqueous pressure-sensitive adhesive of rosin modified acrylate-styrene multi-block copolymer and preparation process thereof
  • Aqueous pressure-sensitive adhesive of rosin modified acrylate-styrene multi-block copolymer and preparation process thereof
  • Aqueous pressure-sensitive adhesive of rosin modified acrylate-styrene multi-block copolymer and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] (1) Dissolve 30g (0.1mol) of dehydroabietic acid in 180mL of dichloromethane solution, then add 25.4g (0.2mol) of oxalyl chloride and 3 drops of anhydrous N,N-dimethylformamide;

[0100] (2) Replace the air with nitrogen, and react with magnetic stirring at 0° C. for 3 hours, then remove excess oxalyl chloride and dichloromethane by rotary evaporation to obtain an intermediate product;

[0101] (3) Dissolve the intermediate product again in 180 mL of dichloromethane solution, add 14.95 g (0.15 mol) of triethylamine and 14.43 g (0.11 mol) of hydroxyethyl methacrylate at 0 ° C, and replace the air with nitrogen , magnetic stirring reaction for 48 hours;

[0102] (4) washing and neutralizing with 5wt% sodium bicarbonate solution, then drying with anhydrous sodium sulfate, and finally rotary evaporation to remove most of the solvent to obtain dehydroabietic acid hydroxyethyl methacrylate;

[0103] (5) adopt the method for RAFT emulsion polymerization, in the first stage po...

Embodiment 2

[0109] Steps (1)~(5) are exactly the same as in Example 1;

[0110] (6) After the first stage of polymerization reaction is complete, in the second stage, the pre-configured sodium hydroxide solution (dissolve 0.096g (0.0024mol) sodium hydroxide in 10g deionized water) is added into four In the flask, maintain the stability of the emulsion, then, 35.1g (0.2742mol) n-butyl acrylate and the 0.9g (0.0022mol) dehydroabietyl methacrylate hydroxyethyl acrylate that step (4) makes are mixed homogeneously Then add it into the four-necked flask with a syringe, and add 66.5g of deionized water with a syringe at the same time to start the second stage of reaction;

[0111] (7) After the second stage of the reaction is complete, add 4.5g (0.0433mol) styrene and 10.5g of deionized water with a syringe at the same time to start the reaction. After the third stage of the reaction is complete, the rosin-based monomer can be prepared The SBAS three-block copolymer emulsion; The total conversi...

Embodiment 3

[0115] Steps (1)~(5) are exactly the same as in Example 1;

[0116] (6) After the first stage of polymerization reaction is complete, in the second stage, the pre-configured sodium hydroxide solution (dissolve 0.096g (0.0024mol) sodium hydroxide in 10g deionized water) is added into four In the flask, maintain the stability of the emulsion, subsequently, 34.8g (0.2719mol) n-butyl acrylate and the 1.2g (0.0029mol) dehydroabietyl methacrylate hydroxyethyl acrylate that step (4) makes are mixed homogeneously Then add it into the four-necked flask with a syringe, and add 66.5g of deionized water with a syringe at the same time to start the second stage of reaction;

[0117] (7) After the second stage of the reaction is complete, add 4.5g (0.0433mol) styrene and 10.5g of deionized water with a syringe at the same time to start the reaction. After the third stage of the reaction is complete, the rosin-based monomer can be prepared The SBAS three-block copolymer emulsion; The total ...

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Abstract

The invention discloses an aqueous pressure-sensitive adhesive of rosin modified acrylate-styrene multi-block copolymer and a preparation process thereof. Raw materials of the aqueous pressure-sensitive adhesive comprise a polymer emulsion, the polymer emulsion contains an SBAS triblock copolymer containing a rosin-based monomer, and the structural formula of the polymer emulsion is shown as the following formula (I): in the formula, p is selected from 100-180, n is selected from 500-950, m is selected from 105-185, k is selected from 20-30, z is selected from C12H25S and Ph, R is selected from CH(CH3)COOH or C(CH3)2COOH, and R1 and R2 are independently selected from H and CH3. The water-based pressure-sensitive adhesive has excellent initial adhesion and peel strength.

Description

technical field [0001] The invention relates to the technical field of pressure-sensitive adhesives, in particular to a water-based pressure-sensitive adhesive of a rosin-modified acrylate-styrene multi-block copolymer and a preparation process thereof. Background technique [0002] Pressure-sensitive adhesive (PSA) is a viscoelastic material that can form a good bond to the adherend within a short contact time and with a small pressure without the use of solvents, heat or other means. The pressure-sensitive adhesive will not damage the surface structure of the substrate when it is peeled off from the surface of the bonding substrate, the adhesive layer is stable and the bonding time is long, it will not fail due to curing during the bonding process, and it is easy and safe to use, so it is widely used in aerospace , packaging, transportation, electrical appliances, medical and other industries. At present, the most widely used is acrylic pressure-sensitive adhesive, which ...

Claims

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Application Information

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IPC IPC(8): C09J153/00C09J7/25C09J7/38C08F293/00
CPCC08F293/005C08F2438/03C09J7/255C09J7/387C09J153/005C09J2467/006
Inventor 范宏任杰张先伟马中柱罗英武
Owner ZHEJIANG UNIV