Modified hot melt pressure-sensitive adhesive coated at low temperature and preparation method thereof

Abstract

The invention relates to a modified hot melt pressure-sensitive adhesive coated at low temperature and a preparation method thereof. The modified hot melt pressure-sensitive adhesive is prepared by the following components: a styrene-butadiene-styrene block copolymer, a styrene-butadiene block copolymer, hydrogenated rosin glyceride, tall oil rosin glyceride, alkylated diphenylamine and mixtures thereof, dimeric rosin acid, hard kaolin-hydrated aluminum silicate, silicon dioxide by a smoke method, zinc oxide, liquid paraffin, and glycerol. The advantages of the modified hot melt pressure-sensitive adhesive coated at low temperature are that a viscosity modifier is used for modifying to improve the fluidity of the hot melt pressure-sensitive adhesive and improve the fluidity, the creep resistance and flexibility are improved to reduce laddering, the production cost of the hot melt adhesive is reduced, and adjustment substances added in the formula has good compatibility and little effect on peeling strength, which means the melting viscosity of the adhesive is significantly reduced and the bonding strength is not affected after the adjustment substances are added.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a low-temperature coated modified hot-melt pressure-sensitive adhesive and a preparation method thereof. Background technique [0002] Hot-melt pressure-sensitive adhesives are a class of solvent-free adhesives based on thermoplastic elastomers. The operating temperature of traditional hot-melt pressure-sensitive adhesives is usually between 160 and 180°C. Operating under these conditions not only consumes a lot of electric energy, which is not conducive to energy saving and consumption reduction, but also significantly reduces the service life of the coating machine; at the same time It is also very easy to wrinkle and burn the substrate film of sanitary products, and the adhesive is also easy to age, decompose, coke, block the glue delivery pipeline and glue spray nozzle, etc., thus greatly increasing the safety requirements for operators. The bonding of hot-melt adh...

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Problems solved by technology

However, the temperature control is restricted by the relative molecular mass of the hot melt adhesive itself. At the same time, the strength and melt viscosity of the hot melt adhesive are mutually restricted. In order to obtain a certain strength and toughness, there must be a sufficiently high relative molecular mass. The increase of molecular weight will cause the viscosity of the solution to increase sharply. For the convenience of operation, the melting temperature must be increased to reduce the viscosity, but it may lead to thermal degradation of the polymer.

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