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A kind of compatibilizer based on sebs and preparation method thereof

A compatibilizer and solvent technology, which is applied in the field of SEBS-based compatibilizer and its preparation, can solve the problems of high odor, poor bonding performance, inability to obtain, etc., and achieves simple preparation method, adjustable graft density, chain link Long controllable effect

Active Publication Date: 2020-08-28
XIAMEN KEAISI PLASTICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when SEBS is used as a coating material, because its molecular chain does not contain polar or reactive groups, its bonding performance with polar engineering materials such as PC and ABS is poor, which greatly limits its use. It is necessary to polarize SEBS to improve its compatibility with polar polymers
TPU is also a thermoplastic elastomer that can be used as a coating material. Its molecular chain contains a large number of polar groups, which has good compatibility with polar materials, but its hardness is high and its flexibility is poor.
The blending of TPU and SEBS can combine the good flexibility of SEBS with the high polarity of TPU, thereby expanding the application field of SEBS, but the polarity difference between SEBS and TPU is large, and simple blending cannot obtain the desired performance. products, it is necessary to add a compatibilizer to improve the compatibility of SEBS and TPU
[0005] SEBS-g-MAH is cheap and is currently the main compatibilizer used in SEBS / TPU blend systems on the market. However, this compatibilizer has low grafting rate, strong odor, and general compatibilizing effect. The product does not yet meet the requirements
The appearance and feel of the finished product obtained by using SEBS-g-PU as a compatibilizer and coating polar plastics is obviously better than that of SEBS-g-MAH as a compatibilizer, but its price is relatively high, which limits Promotion and application of SEBS-g-PU

Method used

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  • A kind of compatibilizer based on sebs and preparation method thereof
  • A kind of compatibilizer based on sebs and preparation method thereof

Examples

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preparation example Construction

[0029] The preparation method of above-mentioned SEBS-based compatibilizer, comprises the following steps:

[0030] 1) Preparation of SEBS-g-TPU: Add SEBS, isocyanate, initiator and solvent into the reaction kettle, vacuumize and fill with protective gas, react at 80-130°C for 3-8 hours to obtain isocyanate-modified SEBS, then add terminal hydroxyl Polyurethane and catalyst react at 70-90°C for 2-6 hours to obtain SEBS-g-TPU;

[0031] 2) Preparation of SEBS-co-TPU: Add SEBS, isocyanate, initiator and solvent into the reaction kettle, vacuumize and fill with protective gas, react at 80-130°C for 3-8 hours to obtain isocyanate-modified SEBS, then add dihydroxy Compound, react at 60-100°C for 3-5 hours to obtain hydroxyl-terminated SEBS, then add polyurethane prepolymer, react at 70-90°C for 4-6 hours to obtain SEBS-co-TPU;

[0032] 3) Preparation of SEBS-g-TPU / TPU / SEBS blend: Add SEBS, isocyanate, initiator and solvent to the reaction kettle, vacuumize and fill with protective ...

Embodiment 1

[0052] A preparation method of a compatibilizer based on SEBS, comprising the following steps:

[0053] 1) Preparation of isocyanate-modified SEBS: Add 38 parts of anhydrous xylene and 2 parts of SEBS into a three-necked flask equipped with a stirrer, thermometer and dropping funnel and protected by argon, and heat to 80°C to completely dissolve SEBS , add dropwise a mixture solution of 0.1 part of TMI, 0.02 part of DCP and 2 parts of anhydrous xylene. After the dropwise addition, replace the dropping funnel with a spherical reflux condenser and react at 80°C for 5 hours to obtain isocyanate-modified SEBS;

[0054] 2) Preparation of SEBS-g-TPU: Add 3.6 parts of pre-dried linear polyether polyurethane oligomers (number average molecular weight 6000) and 0.02 parts of dibutyltin dilaurate to the isocyanate-modified SEBS of step 1) , react at 90°C for 6h, precipitate the product with methanol, and dry it to constant weight to obtain SEBS-g-TPU.

Embodiment 2

[0056] A preparation method of a compatibilizer based on SEBS, comprising the following steps:

[0057] 1) Preparation of isocyanate-modified SEBS: Add 26 parts of anhydrous toluene and 2 parts of SEBS into a three-neck flask equipped with a stirrer, a thermometer and a dropping funnel and protected by argon, and heat to 120 ° C to completely dissolve SEBS. Add dropwise a mixture solution of 0.2 parts of TAI, 0.03 parts of DBPH and 2 parts of anhydrous toluene. After the addition is completed, replace the dropping funnel with a spherical reflux condenser and react at 80°C for 8 hours to obtain isocyanate-modified SEBS;

[0058] 2) Preparation of SEBS-g-TPU: Add 2.4 parts of pre-dried hyperbranched polyurethane oligomers (number average molecular weight 2500) and 0.02 parts of stannous octoate to the isocyanate-modified SEBS in step 1), and react at 80 ° C for 3 h , the product was precipitated with methanol and dried to constant weight to obtain SEBS-g-TPU.

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Abstract

The invention discloses a styrene-ethylene-butadiene-styrene block copolymer (SEBS)-based compatibilizer and a preparation method thereof. The compatibilizer is composed of at least one of SEBS-g-TPU,SEBS-co-TPU, and an SEBS-g-TPU / TPU / SEBS mixture. The preparation method comprises the following steps: preparation of isocyanate modified SEBS, preparation of terminal hydroxyl SEBS, preparation of blocked isocyanate modified SEBS, preparation of the SEBS-g-TPU, preparation of the SEBS-co-TPU, and preparation of the SEBS-g-TPU / TPU / SEBS mixture. According to the SEBS-based compatibilizer providedby the invention, the raw materials are easy to obtain, the preparation method is simple, the length of a graft chain is controllable, the grafting density is adjustable, and the compatibilizer can significantly enhance adhesion among mixtures and reduce interfacial tension.

Description

technical field [0001] The invention relates to a SEBS-based compatibilizer and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] Compatibilizers, also known as compatibilizers, can promote two incompatible polymers (generally materials with a large difference in polarity) to combine together through intermolecular bonding forces to form a stable blend. The compatibilizer can be understood as a surfactant in thermodynamic nature, it is added to the incompatible polymer system, and mixed and kneaded at a certain temperature, so that the compatibilizer is limited between the two polymers On the interface, it plays the role of reducing interfacial tension, increasing the thickness of the interface layer, and reducing the size of dispersed particles, so that the system finally forms a thermodynamically stable phase structure with macroscopic uniformity and microscopic phase separation characteristics. [0003] SEB...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/63C08G18/32C08L75/04C08L53/02
CPCC08G18/3206C08G18/3215C08G18/633C08L53/025C08L75/04C08L2205/025C08L2205/035C08L2205/08
Inventor 路芳麦裕良张磊高敏严石静王全勇金震
Owner XIAMEN KEAISI PLASTICS TECH
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