High-melt-strength foamable modified PP material and preparation method thereof

A high melt strength, modification technology, applied in the field of PP material modification, can solve the problems of large decline in product performance, insignificant degree of light weight, insufficient cell size, etc., and achieve good compatibility and excellent dispersibility. and liquidity, the effect of improving liquidity

Inactive Publication Date: 2019-12-06
ZHEJIANG UFO AUTOMOBILE MFG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the injection foaming of large automobile parts, the foaming rate is not high, the cells are not large enough, so

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] In order to achieve the foamable requirements of high melt strength injection molding grade, the fluidity MI of PP resin is selected to be 40-60g / 10min, the strength requirements are to choose tensile strength ≥35MPa, flexural modulus ≥1200Mpa, which meets the strength of large injection molding parts. It also ensures the fluidity of injection molding when the material is in a molten state.

[0049] In order to meet the high melt strength effect of foaming modified PP material, the Mooney viscosity of the EPDM rubber particles used in the present invention is ML 1+4 ≥100Mu at 150°C ensures the uniformity of cells, that is, the consistency of foaming rate and foaming size.

[0050] The mass ratio of oil-extended EPDM particles is 10-15%, which improves the fluidity of injection molding while ensuring the viscosity; the comprehensive viscosity mixing of high-viscosity EPDM oil-extended particles meets the requirements of foaming modified PP High melt strength effect of t...

Embodiment 2

[0069] In order to reduce material development costs, improve injection molding efficiency, and continue to improve product fluidity. On the basis of Example 1, in order to increase the experimental comparison, each component of the foamed modified PP material of the present invention is composed of parts by relatively high quality:

[0070] PP resin is 70%,

[0071] EPDM colloidal particles are 10%,

[0072] Talc is 17%,

[0073] PP compatibilizer is 1.5%,

[0074] Degradant is 0.2%,

[0075] Release agent is 1%,

[0076] Antioxidant is 0.3%,

[0077] Through the same preparation method in Example 1, the obtained material properties require tensile strength (200mm / min): 33MPa; flexural modulus 2100MPa; notched impact strength (room temperature) 22KJ / m 2 , Melt index (230℃*2.16kg): 59g / 10min, the equilibrium viscosity of the whole mixture at 200℃ (40g) is 13.5Nm. The cell density of the product is slightly damaged.

Embodiment 3

[0079] Among the performance requirements of the material obtained by the formula and preparation method of the present invention, tensile strength (200mm / min): 25-30MPa; flexural modulus 1800-2200MPa; notched impact strength (normal temperature) 24KJ / m 2 , Melt index (230℃*2.16kg): 40-50g / 10min, the equilibrium viscosity of the whole mixture is 200℃(40g)≥15Nm.

[0080] The micropores in the micro-foamed PP material change the stress distribution in the original polymer material and the way of stress transmission in the material, making the micro-foamed polymer PP material different from other continuous materials in mechanical properties, such as mass Light, high specific strength, good sound insulation effect, can meet the requirements of safe use and sound insulation.

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Abstract

The invention discloses a high-melt-strength foamable modified PP material and a preparation method thereof. The preparation method comprises the following steps: step 1, mixing of main raw materials;step 2, selection of a double-screw extruder with proper screw lead according to the original viscosity of PP resin; step 3, feeding the main raw materials; step 4, mixing of additives; step 5, addition of the additives from a side feeding port; step 6, pelletizing through underwater pelletizing equipment; step 7, drying of a pelletized product obtained in the step 6; and step 8, packaging. According to the invention, the blending technology of double-screw segmented feeding is adopted; PP resin, EPDM colloidal particles, talcum powder, a PP compatilizer, a powdery degradation agent, a release agent and an antioxidant are mixed in proportion, and a secondary side feeding powdery degradation agent is added according to physical flowing requirements, so the mixed modified high-viscosity PPmaterial has sufficiently large viscosity, and foam holes are not broken in the process of injection molding; and the size uniformity of the foam holes can be guaranteed due to reasonable control overthe flowability of the material.

Description

technical field [0001] The invention belongs to the technical field of PP material modification, in particular, the invention relates to a high melt strength foamable modified PP material and a preparation method thereof. Background technique [0002] The current foamed PP materials are all modified with PP resin with high melt strength. This kind of foamed material has high closed cell rate, light weight and high strength. The domestic market is basically based on Basell and Borealis products, with prices ranging from 15,000 to 22,000 yuan per ton, and prices are still rising. Sinopec and PetroChina, two of China's two leading chemical companies, have improved their technology to some extent in recent years, but their application feedback in automobiles needs to be further improved. [0003] Raw materials rely on imports or are monopolized for sales, which leads to the traditional use of high melt strength PP resin for direct use, which has no cost advantage, and parts man...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L23/16C08L83/04C08K3/34C08K5/14B29B9/06
CPCB29B9/065C08L23/12C08L2205/03C08L23/16C08L83/04C08K3/34C08K5/14
Inventor 黄燃郭宏伟黄闪闪裴珊珊
Owner ZHEJIANG UFO AUTOMOBILE MFG CO LTD
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