Preparation process of high-performance solvent-based copolyacrylate pressure-sensitive adhesive

A technology of copolymerized acrylate and preparation process, applied in the direction of adhesive type, ester copolymer adhesive, etc., can solve the problems of low sticking force, low average molecular weight, and difficulty in reaching a sufficiently large molecular weight, and achieve high temperature resistance. The effect of improved performance, good initial viscosity and strong holding force

Active Publication Date: 2018-06-08
JIANGSU JINGHONG NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main disadvantage of domestic solvent-based acrylic pressure-sensitive adhesives is that the holding power at high temperatures is not high. The main reason is that the average molecular weight is low. And the chain termination is easily affected by the solvent, which makes it difficult to achieve a large enough molecular weight, and the molecular weight growth process takes a long time, which is not conducive to industrial production

Method used

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  • Preparation process of high-performance solvent-based copolyacrylate pressure-sensitive adhesive
  • Preparation process of high-performance solvent-based copolyacrylate pressure-sensitive adhesive
  • Preparation process of high-performance solvent-based copolyacrylate pressure-sensitive adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1,200 grams of butyl acrylate, 400 g of isooctyl acrylate, 140 g of styrene, 200 g of vinyl acetate, 60 g of acrylic acid, 400 g of toluene, and 1 g of azobisisobutyronitrile were fed into a 50 L mechanically stirred reactor, and after replacing nitrogen three times, set The stirring speed is 100r / min, the temperature is raised to 82°C, the heating speed is 5°C / min, and it stabilizes to the set temperature in about 20 minutes.

[0026] After reacting at 82°C for 2.5 hours, feed 1.5 g of azobisisobutyronitrile from the solid feeding port, add 400 g of toluene from the liquid feeding port, set the stirring speed at 50 r / min, and continue the reaction for 1 hour.

[0027] Then raise the temperature to 88°C, add 1000g of ethyl acetate from the liquid feeding port, feed 1.5g of azobisisobutyronitrile from the solid feeding port, continue to react for 1 hour, then cool down, add 1200g of ethyl acetate, stir evenly from The feeding port discharges the material into the contain...

Embodiment 2

[0032] 1,000 grams of butyl acrylate, 600 g of isooctyl acrylate, 100 g of styrene, 240 g of vinyl acetate, 60 g of hydroxyethyl acrylate, 400 g of toluene, and 0.75 g of azobisisoheptanonitrile were fed into a 50L mechanically stirred reactor, and nitrogen was replaced three times After that, set the stirring speed at 100 r / min, raise the temperature to 82° C., and the heating rate is 5° C. / min. About 20 minutes to stabilize to the set temperature.

[0033] After 2.5 hours of reaction time at 76°C, feed 1 g of azobisisoheptanonitrile from the solid feeding port, add 400 g of toluene from the liquid feeding port, set the stirring speed at 50 r / min, and continue the reaction for 2 hours.

[0034] Then raise the temperature to 84°C, add 1000g of ethyl acetate from the liquid feeding port, feed 1.5g of azobisisoheptanonitrile from the solid feeding port, continue to react for 2 hours, then cool down, add 1200g of ethyl acetate, stir evenly from The feeding port discharges the ma...

Embodiment 3

[0039]1,600 grams of butyl acrylate, 340 g of methyl methacrylate, 60 g of methacrylic acid, 400 g of chlorobenzene, and 0.75 g of azobisisoheptanonitrile were fed into a 50L mechanically stirred reactor, and after replacing the nitrogen three times, the stirring speed was set at 100r / min, the temperature was raised to 82°C, and the heating rate was 5°C / min. About 20 minutes to stabilize to the set temperature.

[0040] After 4.5 hours of reaction time at 76°C, feed 0.25 g of azobisisoheptanonitrile from the solid feeding port, add 400 g of toluene from the liquid feeding port, set the stirring speed at 50 r / min, and continue the reaction for 2 hours.

[0041] Then raise the temperature to 84°C, add 1000g of propyl acetate from the liquid feeding port, feed 1.5g of azobisisoheptanonitrile from the solid feeding port, continue to react for 2 hours, then cool down, add 1200g of propyl acetate, stir evenly from The feeding port discharges the material into the container, and it...

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Abstract

The preparation process of high-performance solvent-based copolyacrylate pressure-sensitive adhesive is composed of the following components in proportion by weight: the content of soft monomer is 65-90%wt; the content of hard monomer is 10-30%wt; cross-linking The monomer content is 3%-5%wt; the proportion of the monomer is 10%wt in the early stage of the reaction, 10%-20%wt in the early stage of the growth period, and 40%-60%wt in the later period of the growth period. The total ratio of the end period is 138-163%wt solvent of the monomer weight and 0.03-0.5%wt initiator accounting for the total monomer weight for proportioning. The copolyacrylate of the invention has a large average molecular weight and a wide molecular weight distribution. The molecular weight of the copolyacrylate can be tested by gel permeation chromatography. The weight average molecular weight is 450-900 kg / mol, and the molecular weight distribution index is 4-20.

Description

technical field [0001] The invention relates to a preparation process of a high-performance solvent-type copolymerized acrylate pressure-sensitive adhesive, which belongs to the field of chemical industry. Background technique [0002] Pressure-sensitive adhesive is a kind of adhesive that can be firmly bonded to the adherend without resorting to solvents, heat or other means, and only needs to apply mild pressure. The pressure sensitivity is expressed by its adhesive properties, which are composed of four major adhesive properties, namely initial tack (tack) T, adhesion (adhesion) A, cohesion (cohesion) C and sticky base force. (keying) K. Initial tack T, also known as fast tack, refers to the anti-separation ability shown when the pressure-sensitive adhesive product and the adherend are separated quickly after contacting with a very light pressure. Adhesive force A refers to the ability to resist interface separation between the glue and the adhered surface after pasting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J133/08C09J175/04C08F220/18C08F212/08C08F218/08C08F220/06C08F220/28C08F220/14C08G18/62
Inventor 吴培龙
Owner JIANGSU JINGHONG NEW MATERIAL TECH
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