Halogen-free flame retardant pressure sensitive adhesive composition and adhesive tape

A pressure-sensitive adhesive, flame retardant technology, applied in the direction of adhesive types, ester copolymer adhesives, conjugated diene adhesives, etc., can solve the problems of reducing the cohesion and adhesion of tapes, Achieve excellent flame retardancy, overcome process problems, and overcome the effects of flame retardant migration and aging resistance

Pending Publication Date: 2020-11-10
TESA SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, organic halogen-free flame retardants such as liquid phosphorus flame retardants will act like plasticizers in pressure-sensitive adhesives, reducing the cohesion and adhesion of tapes

Method used

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  • Halogen-free flame retardant pressure sensitive adhesive composition and adhesive tape
  • Halogen-free flame retardant pressure sensitive adhesive composition and adhesive tape
  • Halogen-free flame retardant pressure sensitive adhesive composition and adhesive tape

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0078] In the embodiments of the present invention, the following test methods are used to test the peeling force, holding force and flame retardancy.

[0079] 1. Test method

[0080] (1) Peel adhesion test

[0081] The test was carried out on the 180° peel force of steel - open side and lined side (measurement method V1).

[0082] The peel adhesion to steel is measured under the test conditions of a temperature of 23°C±1°C and a relative humidity of 50%±5%. Samples were cut to a width of 20mm and adhered to a steel plate. The plates are cleaned and conditioned prior to measurement. For this purpose, the plate was first wiped with acetone and then left in air for 5 minutes to allow the solvent to evaporate.

[0083] Then, the side of the three-layer assembly facing away from the test substrate is lined with 25 μm or other thickness of PET, PVC and other plastic films to prevent the stretching or deformation of the adhesive layer during the test. The test specimens were t...

preparation example 1

[0098] Preparation Example 1: Preparation of Polyacrylate I (PA-I)

[0099] A 30 L reactor conventionally used for radical polymerization was charged with 200 g of acrylic acid, 3000 g of butyl acrylate (BA), 6.8 kg of 2-ethylhexyl acrylate (EHA) and 7.24 kg of petroleum ether / acetone (70: 30). After nitrogen had been passed through the reactor for 45 minutes under stirring, the reactor was heated to 58°C and 5.0 g of 2,2'-azobis(2-methylbutyronitrile) ( 67, purchased from DuPont). The jacket temperature was then raised to 75° C. and the reaction was carried out constantly at this external temperature. After one hour of reaction time, an additional 5.0 g of 67. Dilution was performed after 3 hours with 2.0 kg of petroleum ether / acetone (70:30) and after 6 hours with 1.0 kg of petroleum ether / acetone (70:30). In order to reduce residual monomers, a 15 g portion of bis(4-tert-butylcyclohexyl)peroxydicarbonate ( 16, purchased from Akzo Nobel), and added 15g portion of ...

preparation example 2

[0100] Preparation Example 2: Preparation of Polyacrylate II (PA-II)

[0101] A conventional 20 L glass reactor with evaporative cooling suitable for free radical polymerization was charged with 3000 g of a monomer mixture comprising 2190 g of ethylhexyl acrylate, 600 g of methyl acrylate and 210 g of acrylic acid, and 2000 g of acetone: special Boiling point (SBP) petroleum ether 60 / 95 (1:1). After nitrogen had been passed through the reactor for 45 minutes with stirring, the reactor was heated to 58°C and 1.5 g of 2,2'-azobis(2-methylbutyronitrile) dissolved in 60 g of acetone was added ( 67, purchased from DuPont). Afterwards, the external heating bath was heated to 75° C. and the reaction was carried out constantly at this external temperature. After one hour of reaction time, an additional 1.5 g of 67. After 3 hours, the batch was diluted with 900 g of SBP petroleum ether 60 / 95.

[0102] After a reaction time of 5.5 hours, 4.5 g of bis(4-tert-butylcyclohexyl)peroxy...

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Abstract

The invention provides a halogen-free flame-retardant pressure-sensitive adhesive composition and an adhesive tape prepared from the halogen-free flame-retardant pressure-sensitive adhesive composition. The halogen-free flame-retardant pressure-sensitive adhesive composition includes at least one base polymer and at least one flame-retardant tackifying resin compound represented by formula (1), wherein R1 is a substituted or unsubstituted six-membered ring-containing hydrocarbon group, and R2 is an unsubstituted or substituted biphenylene group, and n is an integer of 1 to 3. The flame-retardant pressure-sensitive adhesive composition does not contain a halogen-containing flame retardant and does not contain a conventional flame retardant alone, thereby avoiding the problems of difficult mixing, migration and the like of the flame retardant, and maintaining an appropriate adhesive strength while maintaining excellent flame retardancy.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a halogen-free flame-retardant pressure-sensitive adhesive composition and an adhesive tape prepared from the composition. Background technique [0002] Pressure-sensitive adhesives or pressure-sensitive adhesive tapes can be used in various fields of application (for example, aircraft, automobiles, trains, boats, electric wires, and electronic devices) where high temperature conditions exist, even where there is a risk of fire. Typically, flame retardants are added to pressure sensitive adhesives to prepare flame retardant pressure sensitive adhesive compositions and tapes. Commonly used flame retardants include inorganic flame retardants such as antimony oxide, magnesium hydroxide, aluminum hydroxide, ammonium polyphosphate and silicon-based flame retardants; and organic flame retardants such as halogen-containing, nitrogen-containing and phosphorus-containing Wait. These f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/38C09J133/08C09J109/02C09J11/06
CPCC09J7/385C09J7/38C09J133/08C09J109/02C09J11/06C08K5/5313C09J2301/408C09J2301/302C09J2433/00C08K5/0066
Inventor 李晓菲王苏美曹敏格罗·马茨米里亚姆·泽斯勒
Owner TESA SE
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