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PVC (polyvinyl chloride) pellets special for ultrahigh-transparency hard medical injection molding apparatuses

A high-transparency and ultra-high technology, applied in the field of PVC granules and special-purpose PVC granules for ultra-high-transparency rigid medical injection molding equipment, which can solve the effect of transparency of transparent rigid PVC granules, zooming, and inability to obtain PVC products for medical injection molding equipment, etc. problems, to achieve broad market application prospects, overcome poor liquidity, and achieve the effect of good appearance and visual effects

Active Publication Date: 2017-09-08
WUXI JIAHONG PLASTICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a technical bottleneck at present: due to the addition of the above-mentioned various additives and the influence of the quality of the PVC resin itself, it will have a greater impact on the transparency of the transparent rigid PVC pellets, especially in the injection molding process. When the material flows through the flow channel at high speed, it will produce instantaneous high friction between molecules, which is very easy to cause discoloration or zooming of the material. ester) to reduce the instantaneous high friction between molecules, and it is precisely because the addition of this excessive general-purpose internal lubricant has a great impact on transparency that it is impossible to obtain PVC products for medical injection molding devices with ultra-high transparency

Method used

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  • PVC (polyvinyl chloride) pellets special for ultrahigh-transparency hard medical injection molding apparatuses
  • PVC (polyvinyl chloride) pellets special for ultrahigh-transparency hard medical injection molding apparatuses
  • PVC (polyvinyl chloride) pellets special for ultrahigh-transparency hard medical injection molding apparatuses

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Effect test

Embodiment 3

[0032] Each component VOC content (%) of table 2 embodiment 3PVC pellets

[0033]

Embodiment 1～ Embodiment 4 and Embodiment 3

[0034] The preparation method of embodiment 1~embodiment 4 and embodiment 3 matched group PVC pellets is as follows:

[0035] (1) According to the weight ratio shown in Table 1 and the VOC content (%) shown in Table 2, first polyvinyl chloride resin, methacrylate-butadiene-styrene copolymer (MBS) with a degree of polymerization of 700 , methacrylate processing aid, mercaptan methyl tin heat stabilizer, butyl dodecanoate lubricant, stearic acid, oxidized polyethylene wax and purple blue pigment are put into a high-speed hot mixer for high-speed stirring, kneading to 125 ℃ discharge, and then put it into a low-speed cooling mixer to cool to normal temperature, and obtain a mixed powder that can show a free-flowing state at a temperature lower than 40 ℃; the high-speed thermal mixer is equipped with three layers of stirring blades;

[0036] (2) Quantitatively put the above-mentioned mixed powder into the feeding hopper in the PVC conical twin-screw extrusion granulator, and then ...

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Abstract

The invention discloses PVC (polyvinyl chloride) pellets special for ultrahigh-transparency hard medical injection molding apparatuses. The PVC pallets comprise, by weight, 100 parts of polyvinyl chloride resin with the degree of polymerization being 700, 3.0-4.0 parts of methacryIate-Butadiene-Styrene copolymer, 1.5-2.0 parts of methacrylate processing aid, 2.0-2.2 parts of methyltin mercaptide heat stabilizer, 2.0-2.3 parts of butyl dodecanoate lubricant, 0.2-0.3 part of stearic acid, 0.1-0.25 part of oxidized polyethlene wax and trace indigo pigment. The finished products are prepared by means of feeding the components into a high-speed heating mixer according to the proportion for high-speed mixing, performing kneading to the temperature of 123-125 DEG C prior to discharging, putting the discharged material into a low-speed cooling mixer to be cooled to room temperature to obtain mixed powder, feeding the mixed powder into a pelletizer for pelletizing, and cooling the pellets to the temperature lower than 40 DEG C prior to packaging. The medical injection molding apparatuses made of the PVC pellets have ultrahigh transparency and surface glossiness.

Description

technical field [0001] The invention relates to a PVC pellet, in particular to a special PVC pellet for ultra-high transparency rigid medical injection molding equipment, and belongs to the technical field of plastic pellet production and processing. Background technique [0002] As a general-purpose plastic, PVC resin (polyvinyl chloride) is widely used in various food packaging, pharmaceutical packaging, cosmetic packaging, household appliance packaging, auto parts, and chemical materials due to its relatively low price and ease of processing after modification. , architectural decoration building materials, fire equipment accessories, sanitary ware, supermarket shelves and other fields. [0003] Polyvinyl chloride is a highly polar polymer with strong intermolecular forces. It needs to be heated to a certain temperature to show its plasticity. Rigid and highly transparent PVC materials suitable for injection molding can usually only be processed at temperatures above 180...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/06C08L51/04C08L23/30C08K5/09C08K5/101C08K5/58B29B9/06B29C47/60
CPCB29B9/06B29C48/505C08L27/06C08L2201/08C08L2201/10C08L2205/03C08L51/04C08L23/30C08K5/09C08K5/101C08K5/58
Inventor 顾友强管锡康
Owner WUXI JIAHONG PLASTICS TECH
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