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Waste-rubber-base polyolefin thermoplastic elastomer material and preparation method thereof

A thermoplastic elastomer and waste rubber technology, which is applied in the field of waste rubber-based polyolefin thermoplastic elastomer materials and preparation, can solve the problems of adverse effects on the performance of blended materials, unsatisfactory performance, and low utilization rate of rubber powder. Excellent physical and mechanical properties, short mixing time and reduced energy consumption

Active Publication Date: 2015-07-01
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the interfacial interaction between waste rubber and thermoplastic resin, it is necessary to add compatibilizer, rubber powder preactivation or desulfurization, or add grafting monomer to graft polyolefin resin and rubber powder under the action of initiator. Mixing modification and other methods, the above method makes the process complicated, and at least there are the following disadvantages: the effect of adding compatibilizer is not obvious, and the performance still cannot meet the requirements; pre-activation or desulfurization of rubber powder will consume a lot of energy, and at the same time adding The small molecular chemical substances in the blend will also cause adverse effects on the properties of the blended material; the content of rubber powder in the blend prepared by adding graft monomers for graft modification is very low and cannot be used as a thermoplastic elastomer, and the rubber powder low utilization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] First put 50 parts by weight of polypropylene into the internal mixer. The set temperature of the internal mixer is 170°C, the speed is 60 rpm, the top bolt is dropped and mixed for 4 minutes, and then the top bolt is opened to add 50 parts by weight of polypropylene. 60-mesh tire tread rubber powder, 2.0 parts by weight of dicumyl peroxide and 0.2 parts by weight of sulfur were dropped on the top plug and reacted in situ for 6 minutes to obtain a high-performance waste rubber-based thermoplastic elastomer material. After measurement, its tensile strength is 17MPa, its elongation at break is 280%, its tear strength is 40kN / m, and its hardness is 50 Shore D.

Embodiment 2

[0038]First, put 40 parts by weight of high-density polyethylene into the internal mixer. The set temperature of the internal mixer is 150°C, the rotation speed is 110 rpm, and the upper top bolt is dropped to mix for 3.5 minutes. Then, the upper top bolt is opened and 60 Parts by weight of 80-mesh tire tread rubber powder and 3.0 parts by weight of di-tert-butyl peroxide are reacted in situ for 5 minutes by dropping the top plug to obtain a high-performance waste rubber-based thermoplastic elastomer material. After measurement, its tensile strength is 15.5MPa, its elongation at break is 250%, its tear strength is 28kN / m, and its hardness is 40 Shore D.

Embodiment 3

[0040] First, the propylene-ethylene copolymer, waste rubber powder and di-tert-butyl peroxide are added to the loss-in-weight feeder at a feeding rate of 40:60:2; wherein the propylene-ethylene copolymer is fed through the loss-in-weight The feeder is added to the main feeding port of the twin-screw extruder, and waste rubber powder and di-tert-butyl peroxide are fed into the side feeding port of the twin-screw extruder through a loss-in-weight feeder; the twin-screw extruder (Φ =27mm, L / D=40) Ten-stage temperature control is adopted, and the temperature is set to 25°C, 140°C, 150°C, 160°C, 160°C, 170°C, 170°C, 170°C, 170°C, 170°C ( Feeding port-machine head), the screw speed is 80 rpm, and the output is 6kg / h. A high-performance waste rubber-based thermoplastic elastomer material is obtained through granulation. After measurement, its tensile strength is 15MPa, its elongation at break is 250%, its tear strength is 27kN / m, and its hardness is 40 Shore D.

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Abstract

The invention discloses a waste rubber-based polyolefin thermoplastic elastomer material and a preparation method thereof, belonging to the field of rubber recycling. The technical proposal is: comprising the following raw materials: 40-90 parts by weight of waste rubber powder, 10-60 parts by weight of polyolefin resin, the sum of the parts by weight of the two is 100 parts by weight; the preparation method includes the following steps: step a: The polyolefin resin is added to a mixing equipment at a temperature of 100-200°C, and fully melted; step b: relative to 100 parts by weight of the mixture of waste rubber powder and polyolefin resin, take 0.5-8 parts by weight of an in-situ modifier, Mix with waste rubber powder, add to mixing equipment, and carry out in-situ modification; step c: granulate to obtain waste rubber-based thermoplastic elastomer. The beneficial effect of the invention is that the filling content of the waste rubber powder is high, the process is simple, the industrial production is easy, and the prepared thermoplastic elastomer material has excellent physical and mechanical properties.

Description

technical field [0001] The invention relates to the field of recycling of waste polymer materials, in particular to a waste rubber-based polyolefin thermoplastic elastomer material and a preparation method thereof. Background technique [0002] Worldwide, about 22 million tons of waste rubber products are produced every year, 55% of which belong to various waste tires. According to the statistics of the Ministry of Industry and Information Technology, China produces about 233 million waste tires every year, with a weight of about 8.6 million tons, which is equivalent to about 3 million tons of rubber resources. If all of them can be recycled and reused, it is equivalent to 5 years of natural rubber in my country. Yield. At the same time, more than 70% of the natural rubber and more than 40% of the synthetic rubber required by my country's rubber products industry need to be imported every year. The contradiction between supply and demand is very prominent, and the impact of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L21/00C08L23/12C08L23/06C08L23/16C08L23/08C08K5/14C08K3/06C08K5/08C08K5/3437B29B9/06
Inventor 李培军赵菲孙学红赵树高张萍
Owner QINGDAO UNIV OF SCI & TECH
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