Preparation technology for high-performance solvent copolymerization acrylate pressure-sensitive adhesive

A co-polyacrylate and solvent-based technology, which is applied in adhesive types, ester copolymer adhesives, adhesives, etc., can solve problems such as being easily affected by solvents, difficult to achieve a large enough molecular weight, and low average molecular weight.

Active Publication Date: 2015-08-19
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 technology for high-performance solvent copolymerization acrylate pressure-sensitive adhesive
  • Preparation technology for high-performance solvent copolymerization acrylate pressure-sensitive adhesive
  • Preparation technology for high-performance solvent copolymerization acrylate pressure-sensitive adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 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.

[0028] 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.

[0029] 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

[0034] 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.

[0035] 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.

[0036] 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

[0041] 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.

[0042] 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.

[0043] 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 i...

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Abstract

Provided is preparation technology for a high-performance solvent copolymerization acrylate pressure-sensitive adhesive. The adhesive comprises the following components, by weight ratio: 65-90% of a soft monomer, 10-30% of a hard monomer, and 3-5% of a crosslinking monomer. The adhesive also comprises a solvent, the weight of which is 10% of the total weight of monomers at an initial reaction stage, is 10-20% of the total weight of monomers at an early stage of a growth stage, is 40-60% of the total weight of monomers at a later stage of the growth stage, and is 138-163% of the total weight of monomers at a final reaction stage, and an initiator, the weight of which is 0.03-0.5% of the total weight of monomers. According to the invention, the copolymerization acrylate is high in average molecular weight and wide in molecular weight distribution. The molecular weight of the copolymerization acrylate can be measured through gel permeation chromatography, and has a weight-average molecular weight in a range of 450-900 kg/mol and a molecular weight distribution index in a range of 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 Applications(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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