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Preparation method of segmented polyurethane with polystyrene as hard segment

A polystyrene and polyurethane technology, applied in the field of polyurethane preparation, can solve the problems of poor material performance, difficult control of polystyrene segment length, poor mutual solubility of soft and hard segments, etc., and achieve low cost, excellent mechanical properties, and easy operation Effect

Inactive Publication Date: 2018-10-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the problems that the length of the polystyrene segment is not easy to control, and the miscibility of the soft and hard segments is poor, resulting in poor performance of the material.

Method used

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  • Preparation method of segmented polyurethane with polystyrene as hard segment
  • Preparation method of segmented polyurethane with polystyrene as hard segment

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Synthesis of hydroxyl-terminated polystyrene: Dissolve 20 parts of styrene in parts by weight in 20 parts of toluene, add 1.04 parts of ACP initiator, stir and heat to 70° C. under nitrogen protection, and the reaction time is 10 h. The product was distilled under reduced pressure and then dissolved and precipitated (dissolved in tetrahydrofuran and precipitated by methanol) and washed twice. After drying, it was weighed to obtain hydroxyl-terminated polystyrene with a yield of 75%. The hydroxyl value Qv is measured according to GB / T 12008.3-2009 phthalic anhydride pyridine chemical titration method.

[0024] 32.12mgKOH / g.

[0025] (2)PS 10 -The synthesis of b-PU block polymer: take by weight 71 parts of polybutylene adipate diol (Qv=108.72mgKOH / g), step (1) gained 10 parts of hydroxyl-terminated polystyrene , 0.2 parts of dibutyltin dilaurate, dissolved in 50 parts of ethyl acetate, then quickly added 19 parts of MDI according to NCO / OH=1, stirred evenly, reacte...

Embodiment 2

[0027] P.S. 20 - Synthesis of b-PU block polymer: take 63 parts by mass fraction of polybutylene adipate diol (Qv=108.72mgKOH / g), embodiment 1 step (1) obtained hydroxyl-terminated polyphenylene 20 parts of ethylene, and 0.2 parts of dibutyltin dilaurate, fully dissolved in 50 parts of ethyl acetate, then quickly add 17 parts of MDI according to NCO / OH=1, stir well, react for 1-2h, stop the reaction, evaporate under reduced pressure The solvent is removed to prepare PS with a PS content of 20%. 20 -b-PU. Its tensile strength is 25.5MPa, and its elongation at break is 836.0%.

Embodiment 3

[0029] P.S. 30 -Synthesis of b-PU block polymer: take 55 parts of polybutylene adipate diol (Qv=108.72mgKOH / g), embodiment 1 step (1) gained hydroxyl-terminated polystyrene by mass fraction 30 parts, and 0.2 parts of dibutyltin dilaurate, fully dissolved in 50 parts of ethyl acetate, then quickly add 15 parts of MDI according to NCO / OH=1, stir evenly, react for 1-2h, stop the reaction, evaporate under reduced pressure solvent to prepare PS with a PS content of 30% 30 -b-PU. Its tensile strength is 34.6MPa, and its elongation at break is 644.2%.

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Abstract

The invention discloses a preparation method of segmented polyurethane with polystyrene as a hard segment and belongs to the technical field of polyurethane. The preparation method comprises the following steps: firstly, utilizing 4,4'-azo bi(4-cyano pentanol) to trigger styrene free radical polymerization in an organic solvent to prepare terminal hydroxyl polystyrene; then reacting with polybutylene glyool adipate, diisocyanate and a catalyst in a solution to prepare polystyrene-b-polyurethane. According to a synthetic route of the preparation method, the raw materials are easy to obtain, reaction conditions are moderate, and convenience in operation is achieved; polystyrene-b-polyurethane copolymer prepared by the preparation method has the advantages of good thermal performance and an excellent mechanical property.

Description

technical field [0001] The invention relates to a method for preparing polyurethane (PS-b-PU) with polystyrene as the hard segment. Specifically, the linear polystyrene (HO-PS-OH) with terminal hydroxyl group (HO-PS-OH) is first synthesized, and then polybutylene adipate diol (HO-PBA-OH), diisocyanate and catalyst are added for solution reaction to prepare a mechanical PS-b-PU block copolymer with excellent strength and thermal stability. technical background [0002] Polyurethane is usually synthesized by reacting polyester or polyether polyol, small molecule diamine or diol chain extender and diisocyanate monomer. Polyester and polyether polyols are generally obtained through polycondensation and ring-opening polymerization, and the molecular chain contains more -CH 2 The - chain link constitutes the soft segment, which has a low glass transition and good flexibility at low temperature; the hard segment contains mostly rigid benzene rings and a highly polar -NHCOO- struc...

Claims

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Application Information

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IPC IPC(8): C08G18/62C08G18/42C08G18/76C08F112/08
CPCC08F112/08C08G18/4063C08G18/4238C08G18/6204C08G18/7671
Inventor 赵京波董皓南张军营
Owner BEIJING UNIV OF CHEM TECH
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