Method for toughening and modifying polypropylene

A technology of toughening and modifying polypropylene, which is applied in the field of blending preparation, can solve problems such as loss of rigidity, achieve improved impact resistance, good mixing and dispersion effects, and expand the application range

Inactive Publication Date: 2014-03-26
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It can be seen from the above that compared with other toughening methods such as increasing rigidity and toughening materials, cross-linking and toughening, elastomer toughening modification is the most effective in terms of actual effect and theoretical model, but the loss of rigidity is also obvious

Method used

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  • Method for toughening and modifying polypropylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Carry out this test according to following raw material mass ratio:

[0021] 1) 100 parts of polypropylene (Shanghai Secco S1003);

[0022] 2) 5 parts of elastomer (Dow ENGAGE8842);

[0023] 3) 10 parts of ultra-high molecular weight polyethylene;

[0024] 4) 10 parts of low-density linear polyethylene (ExxonMobil 6101XR);

[0025] 5) Antioxidant 0.1 (Sinopharm 1010);

[0026] Antioxidant 0.1 (Sinopharm 168);

[0027] 6) Lubricant 1 (Sinopharm liquid paraffin).

[0028] Take 2000g of polypropylene, 100g of elastomer, 200g of ultra-high molecular weight polyethylene, and 200g of low-density linear polyethylene, dry it at 60°C for 4 hours, and then add it to a high-mixer for stirring; then add 2g of antioxidant 1010, 2g of anti-oxidant Oxygen agent 168 and 20g liquid paraffin continue to stir at high speed to make the materials mix evenly.

[0029] The obtained mixture is added to a twin-screw extruder for blending and extrusion, the temperature of the processing...

Embodiment 2

[0032] Carry out this test according to following raw material mass ratio:

[0033] 1) 100 parts of polypropylene (Shanghai Secco S1003);

[0034] 2) 15 parts of elastomer (Dow ENGAGE8842);

[0035] 3) 5 parts of ultra-high molecular weight polyethylene;

[0036] 4) 5 parts of low-density linear polyethylene (ExxonMobil 6101XR);

[0037] 5) Antioxidant 0.1 (Sinopharm 1010);

[0038] Antioxidant 0.1 (Sinopharm 168);

[0039] 6) Lubricant 1 (Sinopharm liquid paraffin).

[0040] Take 2000g of polypropylene, 300g of elastomer, 100g of ultra-high molecular weight polyethylene, and 100g of low-density linear polyethylene, dry it at 60°C for 4 hours, and then add it to a high-mixer for stirring; then add 2g of antioxidant 1010, 2g of anti-oxidant Oxygen agent 168 and 20g of liquid paraffin continue to stir at high speed to make the materials evenly mixed.

[0041] The obtained mixture is added to a twin-screw extruder for blending and extrusion, the temperature of the proces...

Embodiment 3

[0044] Carry out this test according to following raw material mass ratio:

[0045] 1) 100 parts of polypropylene (Shanghai Secco S1003);

[0046] 2) 20 parts of elastomer (Dow ENGAGE8842);

[0047] 3) 5 parts of ultra-high molecular weight polyethylene;

[0048] 4) 5 parts of low-density linear polyethylene (ExxonMobil 6101XR);

[0049] 5) Antioxidant 0.1 (Sinopharm 1010);

[0050] Antioxidant 0.1 (Sinopharm 168);

[0051] 6) Lubricant 1 (Sinopharm liquid paraffin).

[0052] Take 2000g of polypropylene, 400g of elastomer, 100g of ultra-high molecular weight polyethylene, and 100g of low-density linear polyethylene, dry it at 60°C for 4 hours, and then add it to a high-mixer for stirring; then add 2g of antioxidant 1010, 2g of anti-oxidant Oxygen agent 168 and 20g liquid paraffin continue to stir at high speed to make the materials mix evenly.

[0053] The obtained mixture is added to a twin-screw extruder for blending and extrusion, the temperature of the processing se...

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Abstract

The invention discloses a method for toughening and modifying polypropylene. According to the invention, components, component parts and processing characteristics of the method are as follows: a, stoving polypropylene (PP), polyolyaltha olfin (POE), ultra-high molecular weight polyethylene (UHMWPE) and linear low-density polyethylene (LLDPE) resin at the temperature of 60-80 DEG C, and completing mixing in a high-speed mixer at a mass ratio of PP:POE:UHMWPE:LLDPE=100:(3-25):(2-15):(5-20) to obtain a raw material A; b, adding a stabilizing agent and a lubricant in the raw material A at the mass ratio of polypropylene: stabilizing agent: lubricant=100:0.2:1, and conducting high-speed stirring and mixing to obtain a raw material B; c, conducting twin-screw extrusion on the raw material B, and controlling a processing section temperature within 160-210 DEG C and a screw rotating speed within 120-180 rmp to obtain the toughened and modified polypropylene, wherein the cantilever beam impact strength can be improved by 13 times maximally, and the descend range of the tensile yield strength is no more than 12%.

Description

technical field [0001] The invention relates to a blending preparation method for toughening and modifying polypropylene to improve its impact resistance. Background technique [0002] Polypropylene (pp) is a general-purpose plastic resin with wide sources and low price, and has a very wide range of uses. However, polypropylene, especially homopolypropylene, has poor impact resistance and is listed as a brittle material, which limits its application in some fields. As early as the 1950s, research on the toughening of plastics has begun, and the representative variety is HIPS. The early toughening modification was only a blended elastomer. Although the modification effect is very good, the impact strength can be increased several times to dozens of times, but the rigidity of the material is sacrificed while toughening. The toughening mechanism of plastic blended elastomer materials can be explained by the craze-shear band theory: after the elastomer is added to the brittle ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/14C08L23/06C08L23/08B29C47/92B29C48/92
CPCB29C48/92B29C2948/9258B29C2948/92704C08L23/12C08L23/14C08L2205/025C08L2205/035C08L2207/04C08L2207/068C08L23/0815C08L23/06B29C48/40B29C2948/9259
Inventor 陈超刘思俊赵斌徐少洪何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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