Search

CN-121975304-A - Anti-sticking polyurethane and preparation method and application thereof

CN121975304ACN 121975304 ACN121975304 ACN 121975304ACN-121975304-A

Abstract

The application relates to anti-sticking polyurethane and a preparation method and application thereof, wherein the anti-sticking polyurethane comprises the following raw materials, by weight, 70.0-70.8 parts of polytetrahydrofuran ether glycol, 27.0-27.5 parts of diphenylmethane diisocyanate, 1.6-2.2 parts of anti-sticking auxiliary agent, 6.0-6.4 parts of 1, 4-butanediol and 0.2-0.4 part of antioxidant 1010, and the anti-sticking auxiliary agent comprises fluorine-containing T-type modified polysiloxane compound. The stripping force of the anti-sticking polyurethane is less than 1.0N/cm, and the anti-sticking performance is good.

Inventors

  • XIANG HUAN
  • XIANG MIN
  • LUO LIEZHI
  • Fang Shali
  • ZHANG XUEFEN

Assignees

  • 深圳市力信陆南实业有限公司

Dates

Publication Date
20260505
Application Date
20260331

Claims (9)

  1. 1. The anti-sticking polyurethane is characterized by comprising the following raw materials, by weight, 70.0-70.8 parts of polytetrahydrofuran ether glycol, 27.0-27.5 parts of diphenylmethane diisocyanate, 1.6-2.2 parts of anti-sticking auxiliary agent, 6.0-6.4 parts of 1, 4-butanediol and 0.2-0.4 part of antioxidant 1010; the anti-sticking auxiliary agent comprises fluorine-containing T-shaped modified polysiloxane compound; the preparation method of the fluorine-containing T-shaped modified polysiloxane compound comprises the following steps: a1, adding octyl trimethoxy silane into tetramethyl disiloxane, adding trifluoro methane sulfonic acid and water for reaction, adding calcium carbonate, stirring, and filtering to obtain a T-shaped hydrogen-containing sealing head agent; a2, adding the T-shaped hydrogen-containing end sealing agent and octamethyl cyclotetrasiloxane prepared in the step a1 into a reactor, heating, adding trifluoromethanesulfonic acid, reacting, adding calcium carbonate, stirring, and filtering to obtain T-shaped hydrogen-containing silicone oil; a3, adding allyl polyoxyethylene methyl end-capped polyether and perfluorohexyl ethylene into the T-shaped hydrogen-containing silicone oil prepared in the step a2, heating, adding a chloroplatinic acid catalyst, reacting, and cooling to obtain the fluorine-containing T-shaped modified polysiloxane compound.
  2. 2. The release polyurethane according to claim 1, wherein the molar ratio of the allyl polyoxyethylene methyl-terminated polyether to perfluorohexyl ethylene in step a3 is (0.8-1.25): 1.
  3. 3. The release polyurethane of claim 1 wherein the release aid further comprises a diamino terminated linear polydimethylsiloxane.
  4. 4. The release polyurethane according to claim 3, wherein the mass ratio of the diamino terminated linear polydimethylsiloxane to the fluorine-containing T-modified polysiloxane compound in the release aid is 1 (1.1-2.8).
  5. 5. The release polyurethane of claim 3 wherein the release aid comprises a process for preparing a diamino terminated linear polydimethylsiloxane comprising the steps of: Dehydrating the hydroxyl-terminated polydimethylsiloxane, adding 1, 3-bis (3-aminopropyl) -1, 3-tetramethyldisiloxane, stirring, adding a tetramethylammonium hydroxide catalyst, reacting to obtain a mixture, dehydrating the mixture, and removing low-boiling substances to obtain the diamino-terminated linear polydimethylsiloxane.
  6. 6. A process for the preparation of the release polyurethane according to any one of claims 3 to 5, comprising the steps of: s1, dehydrating polytetrahydrofuran ether glycol, adding diphenylmethane diisocyanate, reacting, adding antioxidant 1010, and stirring to obtain a component A; S2, adding the diamino end-capped linear polydimethylsiloxane into the component A prepared in the step S1, stirring and defoaming to obtain a component B; s3, adding the fluorine-containing T-type modified polysiloxane compound into 1, 4-butanediol, and stirring to obtain a solution C; and S4, mixing the solution C obtained in the step S3 with the component B obtained in the step S2, stirring, pouring and solidifying to obtain the anti-sticking polyurethane.
  7. 7. The method for preparing anti-sticking polyurethane according to claim 6, wherein in the step S1, the reaction temperature is 75-85 ℃ and the reaction time is 2-3h.
  8. 8. The method for preparing anti-sticking polyurethane according to claim 6, wherein in the step S4, the casting temperature is 80-120 ℃ and the curing time is 6-10h.
  9. 9. Use of the release polyurethane of any one of claims 1-5 for the preparation of a gasket seal.

Description

Anti-sticking polyurethane and preparation method and application thereof Technical Field The application relates to the technical field of high polymer materials, in particular to anti-sticking polyurethane and a preparation method and application thereof. Background Polyurethane (PU) is an important polymer material prepared from polyol (containing terminal hydroxyl) and polyisocyanate through gradual addition polymerization reaction. Due to their excellent mechanical properties, wear resistance and elasticity, they are widely used in seals, gaskets, conveyor belts, rollers and various industrial parts. However, polyurethane materials have high surface energy, and when they are in long-term contact with other nonmetallic materials (such as PVC, rubber, TPE, silica gel, etc.) under the action of pressure or temperature, adhesion, migration and even mutual dissolution are very easy to occur, resulting in difficulty in separation of products, surface damage or functional failure. Currently, the method for solving the above problems is mainly to perform secondary processing, such as coating silicone oil, fluorine anti-sticking agent or sticking anti-sticking film on the surface of polyurethane product. These methods have the disadvantages of cumbersome process, increased production steps and costs, and unsatisfactory anti-sticking effect. Disclosure of Invention The invention provides anti-sticking polyurethane, a preparation method and application thereof, and the composition has internal and durable anti-sticking characteristics after being formed by a curing reaction. In a first aspect of the application, the application provides anti-sticking polyurethane which comprises the following raw materials, by weight, 70.0-70.8 parts of polytetrahydrofuran ether glycol, 27.0-27.5 parts of diphenylmethane diisocyanate, 1.6-2.2 parts of anti-sticking auxiliary agent, 6.0-6.4 parts of 1, 4-butanediol and 0.2-0.4 part of antioxidant 1010, wherein the anti-sticking auxiliary agent comprises fluorine-containing T-shaped modified polysiloxane compound, the preparation method of the fluorine-containing T-shaped modified polysiloxane compound comprises the following steps of a1 adding octyl trimethoxysilane into tetramethyl disiloxane, adding trifluoromethanesulfonic acid, water, reacting, then adding calcium carbonate, stirring, filtering to obtain a T-shaped hydrogen-containing end enclosure, a2 adding the T-shaped hydrogen-containing agent prepared in the step a1 and octamethyl-cyclotetrasiloxane into a reactor, heating, adding trifluoro-methanesulfonic acid, reacting, then adding calcium carbonate, stirring, filtering to obtain a T-shaped hydrogen-containing silicone oil, a3 adding the fluorine-containing T-containing end enclosure into the step a2, preparing the fluorine-containing T-containing modified polysiloxane, heating to obtain the fluorine-containing end enclosure, adding the fluorine-containing allyl ether, heating to obtain the fluorine-containing end enclosure, and cooling the fluorine-containing end enclosure. By adopting the technical scheme, the application provides the anti-sticking polyurethane, the stripping force of which is smaller than 1.0N/cm, and the anti-sticking performance is good. This is probably because the T-shaped structure of the fluorine-containing T-shaped modified polysiloxane compound can stably migrate and be anchored on the surface of the material in the curing process, the polyether segment ensures good compatibility with the polyurethane matrix to prevent phase separation, and the fluorine segment can effectively reduce the surface energy, which is the key to realizing the anti-sticking function. The polyether chain segment and the fluorine chain segment in the fluorine-containing T-shaped modified polysiloxane compound are synergistic, so that the anti-sticking performance of the anti-sticking polyurethane is improved together. Optionally, in the step a3, the molar ratio of the allyl polyoxyethylene methyl-terminated polyether to the perfluorohexyl ethylene is (0.8-1.25): 1. By adopting the technical scheme, when the molar ratio of the allyl polyoxyethylene methyl end-capped polyether to the perfluorohexyl ethylene is controlled to be (0.8-1.25): 1, the anti-sticking polyurethane has better anti-sticking performance. Optionally, the release aid further comprises a diamino terminated linear polydimethylsiloxane. Optionally, in the anti-sticking auxiliary agent, the mass ratio of the diamino terminated linear polydimethylsiloxane to the fluorine-containing T-shaped modified polysiloxane compound is 1 (1.1-2.8). By adopting the technical scheme, the dosage of the diamino end-capped linear polydimethylsiloxane and the fluorine-containing T-shaped modified polysiloxane compound is adjusted according to the mass ratio, and when the mass ratio of the diamino end-capped linear polydimethylsiloxane to the fluorine-containing T-shaped modified polysiloxane compound is 1 (1.1-2.8), the an