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Stress whitening resistant PBT (Polybutylene Terephthalate) resin and preparation method thereof

A PBT resin and stress-resistant technology, which is applied in the field of stress-whitening-resistant PBT resin and its preparation, can solve the problems of poor stress cracking resistance, reduced elongation at break, and impact on product use, and achieve good bonding force, Easy processing and molding, high production efficiency

Inactive Publication Date: 2018-05-25
HEFEI GENIUS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Stress whitening of the product not only affects its appearance, but also leads to lower elongation at break, lower strength and poor stress cracking resistance of the product, which seriously affects the use of the product

Method used

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  • Stress whitening resistant PBT (Polybutylene Terephthalate) resin and preparation method thereof
  • Stress whitening resistant PBT (Polybutylene Terephthalate) resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) With 85 parts of PBT resin, 15 parts of barite (6000 orders), 5 parts of glass fibers, 2 parts of POE grafted maleic anhydride, 0.3 part of light and heat stabilizer (antioxidant 1076: antioxidant 168= 1:2, mass ratio) and 0.1 part of lubricant stearic acid amide (SR) are mixed evenly by high-speed stirring;

[0038] (2) sending the above-mentioned mixture into a twin-screw extruder to extrude and granulate to obtain PBT resin;

[0039] In the step (2), the screw temperature of the twin-screw extruder is 210° C., and the screw speed is 400 r / min.

[0040] The prepared compound was injection-molded into a standard sample bar for testing according to the standard size, and the performance test results are shown in Table 2.

Embodiment 2

[0042] (1) 98 parts of PBT, 2 parts of barite (7000 mesh), 10 parts of glass fiber, 5 parts of POE grafted maleic anhydride, 0.6 parts of light and heat stabilizer (DLTP:DBTL=1:1, mass ratio) and 0.5 parts of lubricant silicone oil are mixed evenly by high-speed stirring;

[0043] (2) sending the above-mentioned mixture into a twin-screw extruder to extrude and granulate to obtain PBT resin;

[0044] In the step (2), the screw temperature of the twin-screw extruder is 230° C., and the screw speed is 500 r / min.

[0045] The prepared compound was injection-molded into a standard sample bar for testing according to the standard size, and the performance test results are shown in Table 2.

Embodiment 3

[0047] (1) 90 parts of PBT resin, 10 parts of barite (7000 mesh), 30 parts of glass fiber, 10 parts of POE grafted maleic anhydride, 0.1 part of light and heat stabilizer (DLTP: BHT = 2: 1, mass ratio ) and 1 part of lubricant EBS are mixed evenly by high-speed stirring;

[0048] (2) sending the above-mentioned mixture into a twin-screw extruder to extrude and granulate to obtain PBT resin;

[0049] In the step (2), the screw temperature of the twin-screw extruder is 200° C., and the screw speed is 300 r / min.

[0050] The prepared compound was injection-molded into a standard sample bar for testing according to the standard size, and the performance test results are shown in Table 2.

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Abstract

The invention discloses stress whitening resistant PBT (Polybutylene Terephthalate) resin and a preparation method thereof. The stress whitening resistant PBT resin is prepared from the following components in parts by weight: 80 to 98 parts of PBT resin, 2 to 20 parts of barite, 5 to 30 parts of glass fiber, 2 to 10 parts of POE (Polyolefin Elastomer) grafted maleic anhydride, 0.1 to 1 part of photothermal stabilizer and 0.1 to 1 part of lubricating agent. The POE grafted maleic anhydride and the barite are added into the stress whitening resistant PBT resin; the POE grafted maleic anhydrideand the barite have active function group grafts, have better bonding force with a resin matrix, and meanwhile, can form reticular structures in the interior of the resin; thus, the generation of a defect and a whitening phenomenon is reduced after the stress whitening resistant PBT resin is suffered from external force, and the application field of the stress whitening resistant PBT resin is subsequently expanded.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a stress-whitening-resistant PBT resin and a preparation method thereof. Background technique [0002] At present, polyethylene terephthalate (PBT) resin is a very commonly used polymer material with a wide range of applications, but its products are often subjected to external forces such as stretching, bending, and impact during use. There will be partial whitening, which is what we call stress whitening. Stress whitening of the product not only affects its appearance, but also leads to a decrease in the elongation at break, a decrease in strength, and a deterioration in stress cracking resistance, which seriously affects the use of the product. The more common solution to the stress whitening of PBT resin products is to heat-treat the product, that is, to post-process the product under a certain temperature condition to eliminate its internal stress. Wh...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L51/06C08K13/04C08K7/14C08K3/30
CPCC08K2201/014C08L67/02C08L2205/025C08L2205/03C08L2205/035C08L51/06C08K13/04C08K7/14C08K2003/3045C08K5/20C08L83/04C08L91/06
Inventor 杨桂生李晓庆孙欢欢乐俊姚晨光
Owner HEFEI GENIUS NEW MATERIALS
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