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Process for improving friability and cold-flow of carbon dioxide epoxy propylane copolymer

A technology of propylene oxide and carbon dioxide is applied in the field of improving the brittleness and cold flow of carbon dioxide-propylene oxide copolymer, and can solve the problem of high production cost

Active Publication Date: 2006-06-28
迁安市宏奥低碳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Polydibutyl succinate (glutaric acid) (PBS and PBSA) is a semi-crystalline polymer with complete biodegradability, and its glass transition temperature can be adjusted between -32-45 °C, but the production cost is relatively high. high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take 92.5 parts of PPC with a number average molecular weight of 60000g / mol and a molecular weight distribution index of 4.3, 5 parts of PBS, 1 part of MAH, SiO 2 1.5 parts are mixed well in a blender on high. The mixture was vacuum-dried in a vacuum oven at 40°C for 10 hours, and then banburyed in a haake internal mixer at a speed of 30r / min at 140°C until the torque curve became stable to obtain a PPC / PBS blend. The PPC / PBS blend obtained above was pressed into a plate with a thickness of 1 mm at 140 ° C by a flat vulcanizer, and the Young's modulus was 639.5 MPa; the yield strength was 32.48 MPa; the tensile strength was 32.48 MPa;

[0015] The elongation at break is 190.9%; the work of break is 0.58J / mm 2 , There is no viscous flow phenomenon at 70°C.

Embodiment 2

[0017] Take 87.5 parts of PPC with a number average molecular weight of 56000g / mol and a molecular weight distribution index of 3.5, 10 parts of PBS, 1 part of MAH, SiO 2 1.5 parts are mixed well in a blender on high. The mixture was vacuum-dried in a vacuum oven at 40°C for 10 hours, and then banburyed in a haake internal mixer at a speed of 30r / min at 140°C until the torque curve became stable to obtain a PPC / PBS blend.

[0018] The obtained PPC / PBS blend was pressed into a 1 mm thick plate with a flat vulcanizer at 140°C. The Young's modulus was 566.3MPa; the yield strength was 27.33MPa; the tensile strength was 27.33MPa; the elongation at break was 463.7 %; work of fracture is 1.26J / mm 2 , It can maintain dimensional stability at 70 ° C, and no viscous flow phenomenon occurs.

Embodiment 3

[0020] Take 58.5 parts of PPC with a number average molecular weight of 71000g / mol and a molecular weight distribution index of 3.5, 39 parts of PBS, 1 part of MAH, SiO 2 1.5 parts are mixed well in a blender on high. The mixture was vacuum-dried in a vacuum oven at 40°C for 10 hours, and then banburyed in a haake internal mixer at a speed of 30r / min at 140°C until the torque curve became stable to obtain a PPC / PBS blend.

[0021] The obtained PPC / PBS blend was pressed into a 1 mm thick plate with a flat vulcanizer at 140 ° C. The Young's modulus was 598.2 MPa; the yield strength was 34.71 MPa; the tensile strength was 34.71 MPa; the elongation at break was 444.8 %; work of fracture is 1.90J / mm 2 , It can maintain dimensional stability at 70 ° C, and no viscous flow phenomenon occurs.

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PUM

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Abstract

The invention relates to a method to improve the brittleness and cold flow property of carbon dioxide-propylene oxide polymer. Mixing PPC 50-98 portions, and the best is 60-95 portions, PBS 2-50 portions and the best is 5-40 portions, maleic anhydride 1 portion, SiO2 0.5-3.0 portions, the best is 1-2 portions, vacuuming and drying for 10 hours at 40 degree centigrade, internal mixing to gain PPC / PBS(or PBSA) co-mixing material that has fully biology degradation capability, comparing to PPC, the intention strength could be over 30MPa, and broken tensile stretch is improve 3-15 times, and sharply improves the brittleness of PPC. The thermal endurance capability is also improved.

Description

Technical field: [0001] The invention belongs to a method for improving the brittleness and cold flow of carbon dioxide-propylene oxide copolymer. Background technique: [0002] PPC is a completely biodegradable aliphatic polycarbonate synthesized by the copolymerization of carbon dioxide and propylene oxide. Chinese patent CN1116332C and Chinese patent application 03105023.9 ​​provide a synthesis method for high molecular weight PPC. Because the chain flexibility of PPC is relatively large, it is in an amorphous state, the interaction force between molecular chains is small, its glass transition temperature is low (37-40 ° C), and the end of the PPC chain is a hydroxyl group, so PPC has room temperature viscous flow. And low temperature brittleness and other defects. Capping PPC can prevent its unzipper reaction from the end and improve the thermal stability of PPC. The thermal and mechanical properties of PPC can be improved by blending PPC with different polymer materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/34
CPCC08K3/36C08K5/092C08L67/02C08L69/00C08L2666/18
Inventor 周庆海赵晓江王献红王佛松熊涛高凤翔
Owner 迁安市宏奥低碳科技有限公司
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