Solvent-free hot-melt pressure-sensitive adhesive, preparation method and aluminum foil adhesive tape made therefrom

Abstract

The invention discloses solvent-free hot-melt pressure-sensitive adhesive, a preparation method and an aluminum foil adhesive tape prepared from the solvent-free hot-melt pressure-sensitive adhesive. The solvent-free hot-melt pressure-sensitive adhesive consists of 20-50 parts by mass of a thermoplastic elastomer, 40-70 parts by mass of a tackifier, 16-30 parts by mass of a plasticizer and 0.01-0.1 part by mass of an antioxidant. The solvent-free hot-melt pressure-sensitive adhesive is prepared by the steps of adding the tackifier, the plasticizer and the antioxidant to a reaction kettle in nitrogen atmosphere, stirring and heating to 100-130 DEG C, and keeping for 30-80min; adding the thermoplastic elastomer when various accessories are melted to present a flow condition, heating to 140-180 DEG C, stirring for 80-150min until materials are completely and uniformly melted, and discharging product when the product is still hot. The bonding strength, initial adhesion and high-temperature holding power of the solvent-free hot-melt pressure-sensitive adhesive disclosed by the invention is obviously improved superior to environment-friendly water emulsion type acrylate pressure-sensitive adhesive; the solvent-free hot-melt pressure-sensitive adhesive, although being equal to conventional solvent-type rubber pressure-sensitive adhesive in comprehensive performance, cost is greatly reduced, and the solvent-free hot-melt pressure-sensitive adhesive is safe and environmental friendly.

Description

technical field [0001] The present invention relates to a hot-melt pressure-sensitive adhesive and its preparation and application, in particular to a solvent-free environment-friendly hot-melt pressure-sensitive adhesive with excellent performance, a preparation method of the hot-melt pressure-sensitive adhesive and a method made of the hot-melt pressure-sensitive adhesive. into aluminum foil adhesive tape. Background technique [0002] With the improvement of people's living conditions, the demand for household appliances is also increasing. Aluminum foil adhesive tape is a kind of metal foil tape, which is widely used in the joint bonding of all aluminum foil composite materials, the sealing of the punctured part of the insulation nail and the repair of the damaged part. The material distribution department must purchase raw materials, which are widely used in the fixing and pasting of side panel evaporator coils such as refrigerators and freezers, and have good heat con...

AI Technical Summary

Problems solved by technology

[0003] Aluminum foil adhesive tapes generally use solvent-based rubber-based pressure-sensitive adhesives, which have excellent comprehensive performance. However, due to the high cost of solvent-based rubber-based pressure-sensitive adhesives and the presence of benzene-based organic solvents, they seriously pollute the environment. Green environmental protection policies are increasingly required Under the current situation, solvent-based rubber-based pressure-sensitive adhesives are facing the challenge of market shrinkage, and more and more companies related to the refrigeration industry (such as Haier, Midea, Meiling, Xinfei, Siemens, etc.) The emphasis on auxiliary materials not only hopes that the price of raw and auxiliary materials such as aluminum foil adhesive tapes will be lowered, but at the same time ensure the quality of aluminum foil adhesive tapes, which also limits the use of solvent-based rubber-based pressure-sensitive adhesives to a certain extent.

[0004] At present, most of the existing aluminum foil adhesive tapes on the market are coated with solvent-based rubber-based pressure-sensitive adhesives, and only a few adhesive tape companies use water-based pressure-sensitive adhesives or rubber-type hot-melt pressure-sensitive adhesives to coat aluminum foil. There is a problem of general peel strength or poor high-temperature stickiness or general initial tack

For example, the emulsion pressure-sensitive adhesive for aluminum foil adhesive tape produced by a pressure-sensitive adhesive manufacturer in Jiangyin has barely met the minimum requirements for the use of aluminum foil adhesive tape, but its 180° peel strength is average, and there is still a lot of room for improvement; Nanbao Hot-melt rubber pressure-sensitive adhesives have excellent initial tack and 180° peeling force, but relatively poor high-temperature stickiness; rubber-type hot-melt pressure-sensitive adhesives produced by National Starch have good initial tack and stickiness, but there are also general high-temperature stickiness. The problem; Hangzhou Renhe Rubber Hot Melt Pressure Sensitive Adhesive has good 180° peeling force and high temperature stickiness, but the initial tack is relatively poor, which cannot meet the needs of the refrigeration industry

[0005] The Chinese patent with the publication number CN202912886U discloses a water-based high-stripping aluminum foil tape, which only involves the structural composition of the aluminum foil tape, but does not mention the relevant information of the water-emulsion pressure-sensitive adhesive therein; the Chinese patent publication with the publication number CN202643623U A kind of aluminum foil adhesive tape for refrigerator is also just related to some basic structural components, and there is no explanation for the important components, such as the pressure-sensitive adhesive part; the Chinese patent with publication number CN102391803A discloses a colorless transparent hot-melt pressure Sensitive adhesive and its preparation method have better 180° peeling force and initial tack, but poor high-temperature stickiness, which cannot fully meet the requirements for the use of aluminum foil adhesive tapes in the refrigeration industry

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