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A kind of silicone pressure-sensitive adhesive for masking tape and preparation method thereof

A technology of silicone pressure-sensitive adhesive and pressure-sensitive adhesive, applied in the field of adhesives, can solve the problems of poor flexibility of tape, easy to form wire drawing, high price of silicone, and achieve good insulation performance, easy storage, and excellent resistance to atmospheric aging. Effect

Active Publication Date: 2021-07-09
无锡雅达科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the price of silicone is high, it will produce ghost images, and it is easy to form wire drawing when it is glued, which is a problem in the practical application of this kind of products.
[0003] Although silicone pressure-sensitive adhesive can solve these problems in an all-round way, due to the high permeability of masking paper, it is not as smooth as polyester and polyimide films, and has strong unevenness, which leads to particularly strong permeability to glue. It is easy to degumming, produce ghost images, and the softness of the tape is poor. When it is rolled up, it will collapse and scatter, and the tape will be broken. It needs anti-seepage treatment. It is easy to degumming and produce ghost images without anti-penetration treatment.
Therefore, the use of masking paper as a protective film is greatly limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] (1) Take 300 grams of M W =4600g / mol, the methyl M / Q silicone resin toluene solution of the solid content 67% of M / Q=0.78, 60 grams M W =3400g / mol, the methylvinyl M / Q silicone resin toluene solution of M / Q=0.8 vinyl 2.3wt.% solid content 67% is mixed evenly;

[0066] (2) Add 400 grams of M to the mixture obtained in step (1) W =580000g / mol in the toluene solution of hydroxyl-terminated polydimethylsiloxane raw rubber with a solid content of 45%, and mix evenly;

[0067] (3) Add 2 grams of 40% dimethylamine aqueous solution to the mixture obtained in step (2), heat up and reflux for 8 hours, and gradually strip the water generated by the reaction, add 130 grams of toluene during the reaction, and vacuum strip after the reaction Remove part of toluene and oligomers;

[0068] (4) Add toluene to adjust the solid content to 60%, and the viscosity of the glue measured at 25°C is 32000mpa.s, then add 35 grams of vinyl tributylketoxime silane (30wt.%) and methyl tributylket...

Embodiment 2

[0079] (1) Take 500 grams of M W =4600g / mol, the solid content 67% methyl M / Q silicone resin toluene solution of M / Q=0.78, 80 grams M W =3400g / mol, the methylvinyl M / Q resin toluene solution of M / Q=0.8 vinyl 2.3wt.% solid content 67% is mixed evenly;

[0080] (2) Add 850 grams of M to the mixture obtained in step (1) W =580000g / mol in the toluene solution of hydroxyl-terminated polydimethylsiloxane raw rubber with a solid content of 45%, and mix evenly;

[0081] (3) Add 4 grams of 40% dimethylamine aqueous solution to the mixture obtained in step (2), heat up and reflux for 10 hours, and gradually strip the water generated by the reaction, add 200 grams of toluene during the reaction, and vacuum strip after the reaction Remove part of toluene and oligomers;

[0082] (4) Add toluene to adjust the solid content to 60%. The viscosity of the glue measured at 25°C is 46000mpa.s, and then add 17.5 grams of vinyl tributylketoxime silane (30wt.%) and methyl tributylketoxime silane ...

Embodiment 3

[0090] (1) Take 500 grams of M W =4600g / mol, the toluene solution of the methyl M / Q silicone resin of the solid content 67% of M / Q=0.78, 60 grams M W =3400g / mol, the methylvinyl M / Q resin toluene solution of M / Q=0.8 vinyl 2.3wt.% solid content 67% is mixed evenly;

[0091] (2) Add the mixture obtained in step (1) to 450 grams of M W =580000g / mol in the toluene solution of hydroxyl-terminated polydimethylsiloxane raw rubber with a solid content of 45%, and mix evenly;

[0092] (3) Add 5 grams of 40% dimethylamine aqueous solution to the mixture obtained in step (2), heat up and reflux for 8 hours, and gradually strip the water generated by the reaction, add 300 grams of toluene during the reaction, and vacuum strip after the reaction Remove part of toluene and oligomers;

[0093](4) Add toluene to adjust the solid content to 60%, and the viscosity of the glue measured at 25°C is 18500mpa.s, and then add 18 grams of vinyl tributylketoxime silane (30wt.%) and methyl tributylke...

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Abstract

The invention discloses a silicone pressure-sensitive adhesive for masking tape and a preparation method thereof. The raw materials of the silicone pressure-sensitive adhesive include methyl M / Q silicone resin, vinyl M / Q silicone resin, hydroxyl-terminated methyl base silicone rubber, basic catalyst, peroxide and silane coupling agent, the preparation method of the silicone pressure-sensitive adhesive is to mix the methyl M / Q silicone resin and the vinyl M / Q silicone resin uniformly, and The silicone pressure-sensitive adhesive is prepared by adding raw hydroxyl-terminated methyl silicone rubber to the above mixed solution, and then adding an alkali catalyst and a silane coupling agent. Apply the prepared silicone pressure-sensitive adhesive to the masking paper. The prepared masking tape has no ghosting, no stringing and no migration after more than 10 times of sticking. There is no obvious difference in the 30-day follow-up test and can be reused. It has significant economic advantages and environmental protection features.

Description

technical field [0001] The invention relates to adhesive technology, in particular to a silicone pressure-sensitive adhesive for masking tape and its preparation and application. Background technique [0002] Masking tape is widely used in the fields of shoemaking, furniture, automobiles, and home decoration. Traditional masking tapes use acrylic or silicone-modified acrylic. The advantage is low cost, but the disadvantages are also very significant. The bonding time If it is too long, it will cause degumming, migration, sticking and drawing, and some require a higher temperature environment, and acrylic acid cannot meet the requirements. At present, there are two types of masking tapes, one is acrylic as the bonding layer, and the other is silicone pressure-sensitive adhesive as the bonding layer. Acrylic has a certain impact on the environment, and acrylic is not resistant to high and low temperatures, and is not resistant to corrosion. Moreover, it is corrosive (carboxyl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J7/21C09J7/38C09J183/10C09J11/06C08G77/44
CPCC08G77/44C08K2201/014C08L2205/025C08L2205/03C08L2205/05C09J11/06C09J183/10C09J7/21C09J7/38C09J2301/302C09J2301/312C08K5/5465
Inventor 赵秀华吴小燕
Owner 无锡雅达科技有限公司
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