Degradable adhesive for polylactic acid cigarette tows and preparation method thereof

Abstract

The invention provide degradable adhesive for polylactic acid cigarette tows, wherein the water-based polyurethane adhesive can be prepared through three stages, namely prepolymerization, neutralization and salt formation, and dispersion and chain-extension, and can be biologically degraded. The adhesive preparation method comprises the following steps: (1) prepolymerization, in which, 60 to 75 percent of hydroxyl monomer, 2 to 10 percent of hydrophilic monomer and 15 to 25 percent of isocyanate monomer react through gradual polymerization, 1 to 5 percent of solvent is added into the mixture according to the viscosity of a reaction system so as to generate polyurethane prepolymer; (2) 2 to 7 percent of neutralizer is added into the polyurethane prepolymer for neutralization and salt formation, and water which is 1 to 6 times of the solvent is added into the mixture for dispersion of the prepolymer; and (3) 1 to 6 percent of a chain extender is added into the mixture to form the waterborne polyurethane adhesive. The synthesized adhesive is applicable to the adhering of polylactic acid cigarette tows, and can produce the polylactic acid filter tip bar with biological degradation, environmental protection, non toxicity and excellent adhering performance.

Description

technical field [0001] The invention relates to a biodegradable adhesive for cigarette shreds and a preparation method thereof, in particular to a polylactic acid shredded cigarette. Background technique [0002] Existing cigarette filter material on the market is mainly cellulose acetate and polypropylene. Cellulose acetate filter material has a history of more than 30 years. It has excellent filtration and adsorption properties. The filter rod is mainly formed by triacetin plasticizer. Triacetin has a melting and lapping effect on cellulose acetate. The raw material of polypropylene filter material is petroleum, and the manufacturing cost is low. However, since polypropylene is a non-polar material, special adhesives are required for the bonding and molding of fibers. For example, Chinese Patent No. 200410023332.8 proposes a polypropylene tow forming Adhesive, whose main components are styrene-butadiene-styrene block, styrene-isoprene-styrene, petroleum resin, terpene res...

AI Technical Summary

Problems solved by technology

[0010] The present invention combines the various characteristics of polylactic acid cigarette tow and the shortcomings of existing adhesives for polylactic acid tow, overcomes the problems of long drying time, poor adhesive strength, non-degradability, etc., and provides a cigarette tow Biodegradable adhesive and its preparation method