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Flame-retardant thermoplastic polyurethane and preparation method thereof

A thermoplastic polyurethane and flame-retardant technology, which is applied in the synthesis and processing of polyurethane, can solve the problems of large amount of added flame-retardant fillers, unenvironmental-friendly production methods, and easy precipitation of fillers, etc., to achieve the suppression of smoke release and high mechanical properties. , the effect of reducing the calorific value

Pending Publication Date: 2022-07-08
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solved the high price of reactive flame retardant raw materials, immature technology and non-environmental protection of production methods; and the disadvantages of large amount of added flame retardant fillers, large performance damage and easy precipitation of fillers

Method used

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  • Flame-retardant thermoplastic polyurethane and preparation method thereof
  • Flame-retardant thermoplastic polyurethane and preparation method thereof
  • Flame-retardant thermoplastic polyurethane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]A preparation method of silicon-based block thermoplastic polyurethane (Si-TPU): before use, hydroxybutyl-terminated polydimethylsiloxane (PDMS) and polycaprolactone diol (PCL) are heated at 120° C. Vacuum dehydration for 2 h, and then use after cooling to room temperature. 126 g of 4,4'-methylene diphenyl diisocyanate (MDI) was added to a three-necked flask equipped with a stirrer and nitrogen device, and it was stirred and melted into a colorless and transparent liquid at 60 °C; then , adding 219.47g of PCL and 54.87g of PDMS to mix evenly; heating up to make PDMS, PCL and MDI react at 80°C for 2h to obtain a polyurethane prepolymer (PUP), the PUP structural formula is as follows: formula I (m and n in formula I) is the degree of polymerization), and its NCO% value was determined to be 5.38±0.27% by the di-n-butylamine method. Take 400.34g of PUP, carry out chain extension according to the chain extension coefficient f=1, add 23.077g of chain extender 1,4-butanediol (...

Embodiment 2

[0035] A preparation method of flame-retardant thermoplastic polyurethane, comprising the following steps:

[0036] (1) the preparation of Si-TPU, the preparation method is the same as Example 1;

[0037] (2) Preparation of composite methyl vinyl silicone rubber: take 100 g of methyl vinyl silicone rubber (VMQ) raw rubber, 40 g of fumed silica and a structure control agent (containing hydroxyl groups with a mass fraction of 8.5% to 10.0% hydroxyl groups) Silicone oil, OH-PDMS) 4g, added to the RM-200C torque rheometer in turn, mixed uniformly for 15min at 120°C and 60r / min, then the mixed glue was extruded on an open mixer and placed for 4h to obtain a composite methyl vinyl silicone rubber;

[0038] (3) Preparation of flame-retardant thermoplastic polyurethane: The Si-TPU prepared in step (1) and the composite methyl vinyl silicone rubber prepared in step (2) were first dried at 105° C. for 2 h for use; 37.5 g of Si- TPU and 13.5g of compound methyl vinyl silicone rubber we...

Embodiment 3

[0040] A preparation method of flame-retardant thermoplastic polyurethane, comprising the following steps:

[0041] (1) the preparation of Si-TPU, the preparation method is the same as Example 1;

[0042] (2) the preparation of composite methyl vinyl silicone rubber, the preparation method is the same as that of embodiment 2;

[0043] (3) Preparation of flame-retardant thermoplastic polyurethane: The Si-TPU prepared in step (1) and the composite methyl vinyl silicone rubber prepared in step (2) were first dried at 105° C. for 2 hours for later use; 35.2 g of Si- TPU and 12.67g of composite methyl vinyl silicone rubber were added to the RM-200C torque rheometer, wherein the weight ratio of Si-TPU and VMQ in the composite methyl vinyl silicone rubber was 80:20, at 180 ° C Continuously mix for 7min until the torque is stable, then add 0.095g of Shuang 25, dynamically vulcanize for 9min, then add 2.2g of MAPP, 0.88g of MPP and 0.88g of EG and mix for 5min to obtain flame retardan...

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Abstract

The invention relates to the technical field of synthesis and processing of polyurethane, and discloses flame-retardant thermoplastic polyurethane and a preparation method thereof, and the preparation method comprises the following steps: 1) preparing silicon-based block thermoplastic polyurethane; 2) preparing composite methyl vinyl silicone rubber; and 3) preparing the flame-retardant thermoplastic polyurethane. When the expansion system flame retardant is 15 parts by weight, the V-0 flame retardant level that the expansion system flame retardant is extinguished after being away from fire can be achieved, the mechanical property has a very high retention rate, and the problems that a reactive flame retardant raw material is high in price, the process is immature and a production method is not environmentally friendly are solved; and the defects of large addition amount, large performance damage and easy precipitation of the additive flame-retardant filler are overcome.

Description

technical field [0001] The invention relates to the technical field of synthesis and processing of polyurethane, in particular to a flame-retardant thermoplastic polyurethane and a preparation method thereof. Background technique [0002] Thermoplastic polyurethane is an excellent polymer that combines the high elasticity of rubber with the plasticity of plastic. The elastic modulus of thermoplastic polyurethane is between plastic and rubber, and its wear resistance is 5 to 10 times that of natural rubber. It also has excellent chemical solvent resistance and grease resistance. These advantages make it widely used in national economy and national defense security. However, as a material, thermoplastic polyurethane inevitably has some disadvantages. Among them, the most obvious is the poor flame retardancy. The limiting oxygen index (LOI) of thermoplastic polyurethane is generally only about 21, which is a flammable grade. Moreover, the thermoplastic polyurethane has viol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/06C08L83/07C08K5/14C08G18/66C08G18/61C08G18/42C08G18/12
CPCC08L75/06C08G18/61C08G18/4277C08G18/4009C08G18/12C08G18/664C08L2201/02C08L83/04C08K5/14C08G18/3206
Inventor 宗成中崔勇胤曹兰宗迎夏
Owner QINGDAO UNIV OF SCI & TECH
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