A kind of polyester modified silicone leveling agent and preparation method thereof

A polyester modification, silicone technology, applied in the direction of coating, can solve the problems of easy loss of effective substances, weak bonding force between leveling agent and resin, poor heat resistance, etc., and achieves a simple and easy preparation method. Industrial production, the effect of excellent leveling effect

Active Publication Date: 2022-01-25
优卡化学(上海)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, polyether compounds are mostly used for organic modification of silicone, which has poor heat resistance and is not suitable for high temperature resistant systems. In addition, the binding force between leveling agent and resin is not strong, and the effective substances floating on the surface after film formation Loss, poor long-term effect

Method used

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  • A kind of polyester modified silicone leveling agent and preparation method thereof

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preparation example Construction

[0026] The preparation method of above-mentioned polyester modified silicone leveling agent, comprises the steps:

[0027] 1) Mix hydrogen-terminated polydimethylsiloxane with single-ended allyl polycaprolactone, and add solvent until the mixture is clear;

[0028] 2) Warm up the solution obtained in step 1) to 60-90°C, add Karstedt catalyst, and stir for 3-10 hours;

[0029] 3) Separating the reaction solution in step 2) to remove the supernatant, and distilling off low boilers under reduced pressure to obtain a polyester-modified silicone leveling agent.

[0030] The solvent is selected from one of toluene, ethyl acetate, isopropanol and tetrahydrofuran.

Embodiment 1

[0032] Mix 1 mole part of hydrogen-terminated polydimethylsiloxane (molecular weight 652, m=7) with 2 mole parts of single-ended allyl polycaprolactone (molecular weight 686, n=5), add toluene until the mixture is clear, Heat up to 90°C, add Karstedt catalyst (accounting for 0.005% of the total material mass fraction), stir and react for 3 hours, separate liquid to take the lower layer clear liquid, vacuum 0.09MPa vacuum distillation to remove low boilers, and obtain polyester modified silicone fluid leveling agent.

Embodiment 2

[0034] Mix 1.1 molar parts of hydrogen-terminated polydimethylsiloxane (molecular weight 874, m=10) with 2 molar parts of single-ended allyl polycaprolactone (molecular weight 344, n=2), and add ethyl acetate until the mixture To clarify, heat up to 70°C, add Karstedt catalyst (accounting for 0.002% of the total material mass fraction), stir and react for 6 hours, separate the liquid to remove the lower layer, and remove the low boilers by distillation under reduced pressure at a vacuum degree of 0.09MPa to obtain a polyester modified organic compound. Silicon leveling agent.

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Abstract

The invention discloses a polyester modified silicone leveling agent and a preparation method thereof. The leveling agent is composed of hydrogen-terminated polydimethylsiloxane and single-ended allyl polycaprolactone under the action of a catalyst, through It is obtained by catalytic addition reaction, wherein the molar ratio of hydrogen-terminated polydimethylsiloxane to single-ended allyl polycaprolactone is 1-1.5:2; the mass fraction of the catalyst in the total material is 0.001-0.005%. The primary hydroxyl group contained in the polyester modified silicone leveling agent can react with the resin base material, and realize the anchoring of the active ingredient on the coating surface after film formation. It has excellent heat resistance and can be used as a solution, water emulsion or 100% It is used in the form of stock solution.

Description

technical field [0001] The invention relates to the field of chemical synthesis of new materials, in particular to a polyester modified silicone leveling agent and a preparation method thereof. Background technique [0002] Leveling agent is a commonly used coating additive. It is a surface active substance that can be oriented at the liquid / air interface. It has limited compatibility with the coating system and is easy to migrate to the surface of the coating film during the coating process. A layer of low surface energy interface, so as to control the surface state of the coating film, and avoid problems such as orange peel, shrinkage cavity, floating color, sagging, brush marks and other problems on the surface of the coating film. Depending on their chemical structure, leveling agents with this surface control capability can be divided into three major categories: acrylics, silicones, and fluorocarbons. Silicone-based leveling agents have good substrate wetting and anti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D7/47C08G77/445
CPCC08G77/445
Inventor 王锋施丹
Owner 优卡化学(上海)有限公司
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