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CN-121825396-B - Impact-resistant racket surface coating and preparation method thereof

CN121825396BCN 121825396 BCN121825396 BCN 121825396BCN-121825396-B

Abstract

The invention relates to an impact-resistant racket surface coating and a preparation method thereof, belonging to the technical field of coatings; the invention designs a multifunctional polyurethane chain extender, wherein the structure of the multifunctional polyurethane chain extender comprises a rigid benzimidazole structure and a flexible thioether structure, which is beneficial to enhancing the tensile strength of polyurethane, accelerating the energy dissipation after being impacted and realizing the rigid, tough and economical chain extension enhancing effect; moreover, the reactivity of the alcoholic hydroxyl group and the amino group in the chain extender structure is greatly different from that of the isocyanate group, the reaction of the alcoholic hydroxyl group and the amino group in the chain extension reaction is carried out step by step, the amino group preferentially reacts with an anchor molecular chain, and the hydroxyl group is in a delayed reaction, so that the ordered hard segment micro-region is formed, the micro-phase separation degree in a system is enhanced, and the impact resistance is remarkably improved.

Inventors

  • WANG HONGLIANG

Assignees

  • 石狮市冠豪体育用品有限公司

Dates

Publication Date
20260508
Application Date
20260313

Claims (8)

  1. 1. The preparation method of the impact-resistant racket surface coating is characterized by comprising the following steps: Firstly, carrying out benzimidazole synthesis reaction on polylactic acid and o-phenylenediamine to obtain a chain extender precursor; Secondly, nucleophilic substitution reaction is carried out on a chain extender precursor and 3-mercaptopropylamine to obtain the chain extender; Thirdly, mixing isophorone diisocyanate, polytetrahydrofuran ether glycol and tin catalyst in a reaction vessel for prepolymerization, continuously adding a chain extender and an organic solvent into the system for chain extension reaction, adding an abrasion-resistant filler, an ultraviolet absorbent, a film forming auxiliary agent, a defoaming agent and a leveling agent into the system, stirring and mixing uniformly, and then defoaming to obtain the impact-resistant racket surface coating; wherein the wear-resistant filler is zinc oxide; Wherein, the conditions for the benzimidazole synthesis reaction are as follows: mixing chlorlactic acid, o-phenylenediamine and concentrated hydrochloric acid with the mass fraction of 20-30% in a reaction vessel under the protection of nitrogen, then placing the reaction vessel in a microwave reactor, and reacting at the microwave power of 400-800W and the temperature of 100 ℃ to obtain a chain extender precursor; The conditions under which nucleophilic substitution reactions occur are: mixing a chain extender precursor, 3-mercaptopropylamine and an ethanol aqueous solution with the volume fraction of 60-80% in a reaction container under the protection of nitrogen, regulating the pH of a system to 8-9 by using a potassium carbonate aqueous solution with the mass fraction of 10-20%, and then reacting at the temperature of 30-40 ℃ to obtain the chain extender.
  2. 2. The method for preparing an impact-resistant racket surface coating according to claim 1, wherein the tin catalyst is at least one of dibutyl tin dilaurate and stannous octoate.
  3. 3. The method for preparing an impact-resistant racket surface coating according to claim 1, wherein the organic solvent is at least one of N, N-dimethylacetamide and dimethylsulfoxide.
  4. 4. The method for preparing an impact-resistant racket surface coating according to claim 1, wherein the ultraviolet absorber is at least one of ultraviolet absorber UV-326 and ultraviolet absorber UV-327.
  5. 5. The method for preparing an impact-resistant racket surface coating according to claim 1, wherein the film forming auxiliary agent is propylene glycol methyl ether acetate, the antifoaming agent is at least one of YRXP-07 and YRXP-02, and the leveling agent is at least one of BYK-333 and BYK-306.
  6. 6. The method for preparing the impact-resistant racket surface coating according to claim 1, wherein the pre-polymerization condition is that the reaction is carried out for 2-3 hours at the temperature of 75-85 ℃, and the chain extension reaction condition is that the reaction is carried out for 1.5-2.5 hours at the temperature of 65-75 ℃.
  7. 7. The preparation method of the impact-resistant racket surface coating according to claim 1, wherein the mass ratio of isophorone diisocyanate, polytetrahydrofuran ether glycol, tin catalyst, chain extender, organic solvent, wear-resistant filler, ultraviolet absorber, film forming additive, defoamer and leveling agent is 30-40:50-60:0.1-0.3:5-10:20-40:10-20:1-2:5-8:0.2-0.5:0.2-0.5.
  8. 8. An impact-resistant racket coating prepared by the preparation method of claim 1.

Description

Impact-resistant racket surface coating and preparation method thereof Technical Field The invention belongs to the technical field of coatings, and particularly relates to an impact-resistant racket surface coating and a preparation method thereof. Background Badminton is used as sports with both competitive and popular sports, and increasingly stringent requirements are put on racket performance. The performance of the surface coating of the racket, which is used as a direct transmission medium between the player and the badminton, directly influences the service life of the racket, the hitting hand feeling and the overall athletic performance. With the development of modern badminton movements to high speed and high resistance, the impact load born by the racket at the moment of hitting the ball is obviously increased, and higher requirements are put on the impact resistance and wear resistance of the surface coating. Based on the above, the invention provides an impact-resistant racket surface coating and a preparation method thereof. Disclosure of Invention The invention aims to provide an impact-resistant racket surface coating and a preparation method thereof, which are used for solving the problems in the background art. The aim of the invention can be achieved by the following technical scheme: A preparation method of an impact-resistant racket surface coating comprises the following steps: Firstly, carrying out benzimidazole synthesis reaction on polylactic acid and o-phenylenediamine to obtain a chain extender precursor; The preparation method comprises the steps of mixing the polylactic acid, the o-phenylenediamine and the concentrated hydrochloric acid with the mass fraction of 20-30% in a reaction vessel under the protection of nitrogen, placing the reaction vessel in a microwave reactor, reacting for 20-40 min under the conditions of the microwave power of 400-800W and the temperature of 100 ℃, adding concentrated ammonia water into a system to neutralize and precipitate after the reaction is finished, and recrystallizing the precipitate with absolute ethyl alcohol to obtain the chain extender precursor. Secondly, nucleophilic substitution reaction is carried out on a chain extender precursor and 3-mercaptopropylamine to obtain the chain extender; The preparation method comprises the steps of mixing a chain extender precursor, 3-mercaptopropylamine and an ethanol aqueous solution with the volume fraction of 60-80% in a reaction container under the protection of nitrogen, regulating the pH of the system to 8-9 by using a potassium carbonate aqueous solution with the mass fraction of 10-20%, reacting for 12-24 hours at the temperature of 30-40 ℃, removing the solvent by rotary evaporation of the reaction solution after the reaction is finished, and recrystallizing the residual solid by absolute ethanol to obtain the chain extender. Thirdly, mixing isophorone diisocyanate, polytetrahydrofuran ether glycol and tin catalyst in a reaction vessel for prepolymerization, continuously adding a chain extender and an organic solvent into the system for chain extension reaction, adding an abrasion-resistant filler, an ultraviolet absorbent, a film-forming auxiliary agent, a defoaming agent and a leveling agent into the system, stirring and mixing uniformly, and then defoaming to obtain the impact-resistant racket surface coating. Further, the relative molecular mass specification of the polytetrahydrofuran ether glycol is 1000-2000. Further, the tin catalyst is at least one of dibutyl tin dilaurate and stannous octoate. Further, the organic solvent is at least one of N, N-dimethylacetamide and dimethyl sulfoxide. Further, the wear-resistant filler is at least one of aluminum oxide and zinc oxide. Further, the ultraviolet absorber is at least one of ultraviolet absorber UV-326 and ultraviolet absorber UV-327. Further, the film forming auxiliary agent is propylene glycol methyl ether acetate. Further, the defoamer is at least one of YRXP-07, YRXP-02. Further, the leveling agent is at least one of BYK-333 and BYK-306. Further, the pre-polymerization condition is that the reaction is carried out for 2-3 hours at the temperature of 75-85 ℃. Further, the chain extension reaction is carried out for 1.5-2.5 hours at the temperature of 65-75 ℃. Further, the mass ratio of isophorone diisocyanate, polytetrahydrofuran ether glycol, tin catalyst, chain extender, organic solvent, wear-resistant filler, ultraviolet absorber, film forming auxiliary agent, defoamer and leveling agent is 30-40:50-60:0.1-0.3:5-10:20-40:10-20:1-2:5-8:0.2-0.5:0.2-0.5. The invention also provides the anti-impact racket surface coating prepared by the preparation method. The invention has the beneficial effects that: The polyurethane chain extender with the benzimidazole structure, the thioether structure, the alcohol hydroxyl structure and the amino structure in the structure is designed, the rigid benzimidazole structure and the flexible thio