CN-115819718-B - Solvent type single-component polyurethane resin and preparation method thereof

CN115819718BCN 115819718 BCN115819718 BCN 115819718BCN-115819718-B

Abstract

The invention belongs to the technical field of adhesives, and relates to solvent type single-component polyurethane resin and a preparation method thereof, wherein the solvent type single-component polyurethane resin comprises, by weight, 15-25 parts of isocyanate, 25-35 parts of macromolecular polyol, 20-30 parts of addition modified body, 5-10 parts of small molecular chain extender, 0.05-0.3 part of catalyst and 55-65 parts of solvent. The invention introduces an addition modifier, which is prepared by reacting 2, 4-toluene diisocyanate and trimethylolpropane under specific conditions, and the addition modifier is favorable for improving the water resistance, alcohol resistance and easy coloring performance of the product, and interacts with other components to ensure that the solvent-type single-component polyurethane resin has excellent water resistance, alcohol resistance and coloring stability.

Inventors

YANG ZHIQIANG
CHEN TIANAN
WANG JIANBIN
XIE HAIHUA

Assignees

烟台德邦科技股份有限公司

Dates

Publication Date: 20260508
Application Date: 20221206

Claims (2)

1. The solvent type single-component polyurethane resin is characterized by comprising the following components in parts by weight: 15-25 parts of isocyanate, 25-35 parts of macromolecular polyol, 20-30 parts of addition modified body, 5-10 parts of small molecular chain extender, 0.05-0.3 part of catalyst and 55-65 parts of solvent; The addition modifier is formed by addition reaction of 2, 4-toluene diisocyanate and trimethylolpropane; the mass ratio of the 2, 4-toluene diisocyanate to the trimethylolpropane is (3.85-3.95) 1; The preparation method of the addition modified body comprises the following steps: s1, dehydrating trimethylolpropane and dissolving the dehydrated trimethylolpropane into an ethyl acetate solution to obtain a trimethylolpropane solution; s2, 4-toluene diisocyanate is put into a reactor, three-quarters of trimethylolpropane solution is dripped into the reactor, and the reaction is stirred for 1.5-3 hours under the conditions of constant temperature heating at 50-55 ℃ and condensation reflux, so as to obtain an intermediate reaction solution; s3, heating the intermediate reaction solution to 85-90 ℃, continuously dropwise adding the rest trimethylolpropane solution, and stirring and reacting for 1.5-3 hours under the condition of condensing and refluxing to prepare an addition modified body with the NCO mass fraction of 9.4-9.7%; The isocyanate is at least one of 2, 4-toluene diisocyanate, 2, 6-toluene diisocyanate and dicyclohexylmethane diisocyanate; the macromolecular polyol is at least one of poly (adipic acid-ethylene glycol-butanediol ester glycol), poly (adipic acid-neopentyl glycol ester glycol) and poly (adipic acid-diethylene glycol-2, 2-dimethylolbutanol ester glycol); the small molecule chain extender is at least one of 1, 4-butanediol and trimethylolpropane; the catalyst is at least one of dibutyl tin dilaurate, organic bismuth and organic zinc; The solvent is ethyl acetate.
2. The method for preparing a solvent-based one-component polyurethane resin as claimed in claim 1, comprising the steps of: d1, mixing isocyanate and macromolecular polyol, stirring at 75-80 ℃ for reaction for 1-2 hours, and adding 30-40 parts of solvent for dilution to obtain a soft segment prepolymer A; D2, cooling the soft segment prepolymer A prepared in the step D1 to 40-50 ℃, adding a small molecular chain extender, a catalyst and 25 parts of solvent, heating to 75-80 ℃ and stirring for reacting for 1.5-3 hours to prepare an intermediate prepolymer B; And D3, cooling the intermediate prepolymer B prepared in the step D2 to 40-50 ℃, adding the addition modified body, heating to 70-75 ℃, stirring and reacting for 1.5-3 hours, and preparing the target product.

Description

Solvent type single-component polyurethane resin and preparation method thereof Technical Field The invention belongs to the technical field of adhesives, and particularly relates to solvent type single-component polyurethane resin and a preparation method thereof. Background Most of common products in the market are double-component polyurethane resin, in the production process, two components are required to be produced and processed respectively, the production efficiency is low, in the sizing process, the double-component polyurethane resin is required to calculate the mixing proportion, the two components are required to be prepared on site, the stirring time and the stirring uniformity of the double-component polyurethane resin can influence the construction quality, the double-component polyurethane resin is required to be used up in a specified time, otherwise, the double-component polyurethane resin cannot be used for a long time, so that waste is caused, and the double-component polyurethane resin is not environment-friendly. Therefore, the solvent type single-component polyurethane resin which can replace the glue requirement of the polyurethane resin is developed, the production efficiency can be improved, the glue applying process can be optimized, Solvent-borne one-component polyurethane resins are a class of resins consisting of isocyanate-terminated high molecular weight polyurethanes and solvents. When in use, the resin is directly coated on the glue point without adding a curing agent, and the resin reacts with trace moisture in the air to be cured, so that the polymer with excellent properties is generated. The single-component polyurethane resin is simpler and faster in the sizing process, has the advantages of stable product quality, low requirement on sizing environment and the like, and is more and more widely applied in life. The water resistance, alcohol resistance and easy-to-color stability of the existing solvent type single-component polyurethane resin also need to be further improved, so that the water resistance, alcohol resistance and easy-to-color stability can be beneficial to process production and design optimization, the reject ratio in the production process is reduced, and the environment protection is facilitated. Disclosure of Invention The invention provides a solvent type single-component polyurethane resin and a preparation method thereof, aiming at the defects in the prior art. The specific technical scheme of the invention is as follows: the invention provides solvent type single-component polyurethane resin, which comprises the following components in parts by weight: 15-25 parts of isocyanate, 25-35 parts of macromolecular polyol, 20-30 parts of addition modified body, 5-10 parts of small molecular chain extender, 0.05-0.3 part of catalyst and 55-65 parts of solvent; The addition modified body is formed by addition reaction of 2, 4-toluene diisocyanate and trimethylolpropane. The addition modifier is helpful for improving the water resistance, alcohol resistance and easy coloring performance of the product. Further, the mass ratio of the 2, 4-toluene diisocyanate to the trimethylolpropane is (3.85-3.95): 1. Further, the preparation method of the addition modified body comprises the following steps: s1, dehydrating trimethylolpropane and dissolving the dehydrated trimethylolpropane into an ethyl acetate solution to obtain a trimethylolpropane solution; S2, 4-toluene diisocyanate is put into a reactor, three-quarters of trimethylolpropane solution is slowly dripped into the reactor, and stirring reaction is carried out for 1.5-3 hours under the conditions of constant temperature heating at 50-55 ℃ and condensation reflux, so as to obtain an intermediate reaction solution; S3, heating the intermediate reaction liquid to 85-90 ℃, continuously dropwise adding the rest trimethylolpropane solution, and stirring and reacting for 1.5-3h under the condition of condensing and refluxing to prepare the addition modified body with the NCO mass fraction of 9.4-9.7%. The reaction formula is as follows: further, the isocyanate is at least one of 2, 4-toluene diisocyanate, 2, 6-toluene diisocyanate and dicyclohexylmethane diisocyanate. Further, the macromolecular polyol is at least one of poly (adipic acid) -ethylene glycol-butanediol glycol, poly (adipic acid) -diethylene glycol-2, 2-dimethylolbutanol glycol and poly (adipic acid) -neopentyl glycol ester glycol. Further, the small molecule chain extender is at least one of 1, 4-butanediol and trimethylolpropane. Further, the catalyst is at least one of dibutyl tin dilaurate, organic bismuth and organic zinc. Further, the solvent is preferably ethyl acetate. The second purpose of the invention is to provide a preparation method of the solvent type single-component polyurethane resin, which comprises the following steps: d1, mixing isocyanate and macromolecular polyol, stirring at 75-80 ℃ for reaction for 1-2 hours, and adding 3