Water foaming injection molding method for PP/LDPE ultra-extension product

A technology of injection molding and water foaming, applied in the direction of coating, etc., can solve the problems of high requirements, unconsidered, and difficulties in the control of process conditions, and achieve the effects of reducing equipment operating costs, improving dimensional accuracy, and convenient operation

Active Publication Date: 2016-03-09
WENZHOU XINTAI NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current conventional injection machine does not take into account the difference of the processed raw materials, so its basic structure is not conducive to the production of products with better microporous structure
Therefore, without changing the equipment and devices, it will be difficult to produce water-foamed microporous products through ordinary injection machines, let alone use it to produce ultra-ductile microporous products. Its requirements for process condition control higher

Method used

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  • Water foaming injection molding method for PP/LDPE ultra-extension product
  • Water foaming injection molding method for PP/LDPE ultra-extension product
  • Water foaming injection molding method for PP/LDPE ultra-extension product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] First, the carrier masterbatch is manufactured. Weigh raw materials according to the following weights: LDPE: 0.9kg, activated carbon: 0.1kg, and the mass ratio of activated carbon to LDPE is 1:9. After mixing activated carbon and LDPE raw materials, the carrier masterbatch is obtained through an ordinary plastic extruder, and the melt temperature is 165°C during the extrusion process;

[0039] Secondly, evenly disperse the above-mentioned carrier masterbatch and immerse it in water. After 6 hours, take it out and drain until there is no obvious water trace on the surface. Weigh its mass as 1175g, spread the masterbatch and blow it under the fan for about 20 minutes, and put Quality control is 1150g;

[0040] At the same time, weigh raw materials PP: 6.638KG, LDPE: 2.212KG, the mass ratio of LDPE to PP is 1:3, after mixing evenly, melt, extrude and pelletize through ordinary plastic extruder;

[0041] Afterwards, above-mentioned two kinds of materials are mixed homoge...

Embodiment 2

[0045] First, the carrier masterbatch is manufactured. Weigh the raw materials according to the following weights: LDPE: 0.5kg, activated carbon: 0.5kg, the mass ratio of activated carbon to LDPE is 1:1. After mixing activated carbon and LDPE raw materials, the carrier masterbatch is obtained through an ordinary plastic extruder, and the melt temperature is 165°C during the extrusion process;

[0046] Secondly, evenly disperse the above-mentioned carrier masterbatch and immerse it in water. After 6 hours, take it out and drain until there is no obvious water trace on the surface. Weigh its mass as 1175g, spread the masterbatch and blow it under the fan for about 20 minutes, and put Quality control is 1150g;

[0047] At the same time, weigh raw materials PP: 5.90KG, LDPE: 2.95KG, the mass ratio of LDPE to PP is 1:2, after mixing evenly, melt, extrude and pelletize through an ordinary plastic extruder;

[0048] Afterwards, above-mentioned two kinds of materials are mixed homog...

Embodiment 3

[0052] First, the carrier masterbatch is manufactured. Weigh raw materials according to the following weights: LDPE: 0.98kg, activated carbon: 0.02kg, and the mass ratio of activated carbon to LDPE is 1:49. After mixing activated carbon and LDPE raw materials, the carrier masterbatch is obtained through an ordinary plastic extruder, and the melt temperature is 165°C during the extrusion process;

[0053] Secondly, evenly disperse the above-mentioned carrier masterbatch and immerse it in water. After 6 hours, take it out and drain until there is no obvious water trace on the surface. Weigh its mass as 1175g, spread the masterbatch and blow it under the fan for about 20 minutes, and put Quality control is 1150g;

[0054] At the same time, weigh raw materials PP: 7.080KG, LDPE: 1.77KG, the mass ratio of LDPE to PP is 1:4, after mixing evenly, melt, extrude and pelletize through ordinary plastic extruder;

[0055] Afterwards, above-mentioned two kinds of materials are mixed homo...

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Abstract

The invention discloses a water foaming injection molding method for a PP / LDPE ultra-extension product. The water foaming injection molding method includes the following steps that firstly, activated carbon and LDPE raw materials are mixed and then pass through a common plastic extruder, and carrier master batches are manufactured; secondly, PP and LDPE are mixed evenly, and a PP / LDPE compound material is formed; thirdly, the PP / LDPE compound material in the second step is melted, extruded and diced through the common plastic extruder, and an even compound is obtained; fourthly, the carrier master batches prepared in the first step are soaked into water, and the carrier master batches are taken out after several hours and properly dried; fifthly, the carrier master batches in the fourth step and the mixture prepared in the third step are evenly mixed to form a mixed material; and sixthly, the mixed material is added to a common horizontal injection molding machine, and therefore a PP / LDPE micropore product can be produced. According to the water foaming injection molding method for the PP / LDPE ultra-extension product, the ductility of the prepared product is three or more times that of a common injection part, the elongation at break of the product is over 370%, water serves as a foaming agent and is easy to obtain, cost is low, and storing and adding are easy to implement.

Description

technical field [0001] The invention relates to a water-foaming injection molding method for PP / LDPE ultra-extended products, and belongs to the technical field of processing and manufacturing polymer materials. Background technique [0002] In recent years, plastic products have been widely used, among which injection products account for an important proportion due to their strong production adaptability, high efficiency, and easy automation. However, with the shortage of energy, especially oil, how to save plastic raw materials has led to the generation and development of foamed products. Usually, the cells inside the foamed product are formed by the plastic raw material during the molding process or by adding some gas. Compared with ordinary foamed products, microcellular foamed products have unique microporous morphology and excellent mechanical properties, and are widely used in packaging, construction, automobile industry, aerospace and sports equipment and other ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/00B29C45/76B29C45/77B29C45/78B29B9/12B29B9/06
CPCB29B9/06B29B9/12B29C45/00B29C45/76B29C45/77B29C45/78B29C2945/76498B29C2945/76551
Inventor 周应国吴文斌
Owner WENZHOU XINTAI NEW MATERIALS CO LTD
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