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Method quickening II-I crystal form transformation of isotactic polybutylene-1 and applications in raising mechanical properties

An isotactic polybutene, II-I technology, applied in the field of polymer processing, can solve problems such as difficult application and complicated process, achieve simple preparation process, improve tensile strength and impact strength, and shorten crystal transformation time Effect

Active Publication Date: 2016-01-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, iP-1-B is a polymorphic polymer with five crystal forms: I, II, III, I', and II', among which the most important and practical ones are type I and type II, but currently The crystallization rate and crystallinity of iP-1-B are poor, and iP-1-B has the transformation characteristics of metastable crystal form II to stable crystal form I after melt processing. trend, which complicates the process of obtaining stable crystal form I, and at room temperature with the fastest crystal transformation rate, it still takes about 7 days to complete the whole process, so it is difficult to be widely used

Method used

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  • Method quickening II-I crystal form transformation of isotactic polybutylene-1 and applications in raising mechanical properties
  • Method quickening II-I crystal form transformation of isotactic polybutylene-1 and applications in raising mechanical properties
  • Method quickening II-I crystal form transformation of isotactic polybutylene-1 and applications in raising mechanical properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 50g of polybutene-1 and 0g, 0.005g, and 0.015g of graphene were placed in an XSS-30 torque rheometer at 160°C and mechanically melted and blended for 10 minutes, and then taken out for use.

[0021] Weigh 8g of the composite material and place it on a 0.5mm mold, melt it on a flat vulcanizer and press step by step to prepare a sheet, then quickly transfer it to a cold press to cool to room temperature, and cut the iP-1-B / The graphene composite material sheet is cut into a disc with a diameter of 20mm thick. Place the wafer on a CSS450 shear heating stage at a rate of 30 °C / min to 200 °C, keep it warm for 5 minutes to eliminate the heat history, then cool it down to 95 °C at a rate of 30 °C / min, and crystallize isothermally for 2 hours, then take it out and place it in a Crystallized isothermally in an oil bath at 20°C, and followed the crystal transformation process with XRD. It was found that when the mass percentage of graphene is 0.01%, compared with pure iP-1-B an...

Embodiment 2

[0023] 50g of polybutene-1 and 0g, 0.015g of graphene were put into XSS-30 torque rheometer under the condition of 160°C, mechanically melted and blended for 10min, and then taken out for use.

[0024] Weigh 8g of composite material and place it on a mold with a thickness of 1mm, melt it on a flat vulcanizer and pressurize it step by step to prepare a sheet, then quickly transfer it to a cold press to cool to room temperature, and use the cutter mold used in GB / T1040.1 Cut it into a dumbbell sample, the standard length is 75mm, and the width is 6.5mm. Repeat this process to prepare 8 stretched splines for use. Weigh 10g of the composite material and put it into a WCS series micro-injection molding machine for melting and injection molding into 10 impact splines whose national standard is GB / T1843 / A. The splines are 80mm long, 10mm wide, and 4mm thick.

[0025] After 15 days of room temperature placement, at room temperature, the tensile sample was tested for tensile strength ...

Embodiment 3

[0027] 50g of polybutene-1 (Shandong Hongguang Chemical Co., Ltd.), and 0g, 0.005g of graphene were placed in an XSS-30 torque rheometer at 160°C for 10 minutes, mechanically melted and blended, and then taken out for use.

[0028] Weigh 8g of composite material and place it on a 1mm mold, melt it on a flat vulcanizer and pressurize step by step to prepare a sheet, then quickly transfer it to a cold press to cool to room temperature, using the cutting knife mold used in GB / T1040.1 Cut it into a dumbbell sample, the standard length is 75mm, and the width is 6.5mm. Repeat this process to prepare 8 stretched splines for use. Weigh 10g of the composite material and put it into a WCS series micro-injection molding machine for melting and injection molding into 10 impact specimens whose national standard is GB / T1843 / A for use. The length of the specimens is 80mm, the width is 8mm, and the thickness is 4mm.

[0029] After 15 days at room temperature, at room temperature, the impact ...

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Abstract

The invention discloses a method quickening II-I crystal form transformation of isotactic polybutylene-1 and applications in raising mechanical properties. Graphene is added in isotactic polybutylene-1 in a fusion state, and after the mixture is mixed uniformly, isothermal crystallization is carried out. The crystal form transformation process is tracked by utilization of XRD, the result shows that addition of graphene promotes crystal form transformation of isotactic polybutylene-1, and in addition, the tensile strength and the impact performance of isotactic polybutylene-1 are raised after test of a universal stretcher and an impact tester.

Description

technical field [0001] The invention belongs to the technical field of polymer processing, more specifically, relates to a method of adding graphene to promote the transformation process of iP-1-B crystal form II-I, and at the same time improve the tensile properties and impact strength of iP-1-B Methods. Background technique [0002] Isotactic polybutene-1, English abbreviation iP-1-B. Its chemical formula is As a thermoplastic material enjoying the reputation of "plastic gold" in the world, polybutene-1 not only has good mechanical properties, outstanding environmental stress crack resistance and heat resistance, excellent creep resistance, and good chemical resistance. Corrosiveness, as well as wear resistance and high filler filling properties similar to ultra-high molecular weight polyethylene, and it is also a high molecular inert polymer, which has great potential in industrial applications such as pipes, films and sheets. value. At the same time, iP-1-B is a pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/20C08K3/04
CPCC08K3/04C08L23/20C08L2207/10
Inventor 李景庆祝玉媛蒋世春尚英瑞
Owner TIANJIN UNIV
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