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Purging compound for cleaning plastic molding machine and mixing machine

A molding machine, mixer technology, applied in the chemical and polymer fields of development, capable of solving problems affecting machine coatings, harmful toxic vapors and residues, damage to machine screws and coatings, etc.

Active Publication Date: 2021-01-15
PTT PUBLIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these substances damage machine screws and coatings
In the third period, plastic molding machines and mixers are cleaned by leaving purge compounds containing acids or bases, but the purge compounds can still affect the machine coating
Importantly, a serious disadvantage is that the chemicals produce toxic vapors and residues that are harmful to both the user and the machine

Method used

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  • Purging compound for cleaning plastic molding machine and mixing machine

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] In a preferred embodiment, the present invention also relates to a process for the preparation of purifying compounds for cleaning industrial plastic molding machines and mixers. According to the invention, there are 3 main steps as follows:

[0024] 1. Preparation of a master plastic mixture comprising the above mentioned substances in (ii).

[0025] 2. Preparation of an additive mixture comprising the above in (iii).

[0026] 3. Mix the thermoplastic polymer with the main plastic mixture derived from step 1 and the additive mixture derived from step 2 using a drum mixer.

[0027] According to another preferred embodiment of the present invention, a twin-screw extruder is provided for the preparation of the main plastic mixture derived from step 1, wherein the high-density polyethylene (HDPE) is fed separately via the main feeder, while the inorganic filler and poly Ethylene Glycol 8000 (PEG 8000) was fed via a side feeder for good results. Separate feeds allow for ...

Embodiment 1

[0034] Example 1: Preparation of a purifying compound that works well at 200 to 350 degrees Celsius for cleaning plastic molding machines and mixers, wherein the formulations are shown in Tables 1, 2 and 3, comprising the following steps:

[0035] 1. The compounds specified in Tables 1 and 2 were weighed and fed into a twin screw extruder where:

[0036] 1.1 To prepare the main plastic mixture using a twin-screw extruder, high-density polyethylene (HDPE) is fed separately via the main feeder, while inorganic fillers and polyethylene glycol 8000 (PEG 8000) are fed via the side feeder .

[0037] 1.2 To prepare the additive mixture using a twin-screw extruder, the low density polyethylene (LDPE) was fed separately via the main feeder, while the inorganic filler and polyethylene glycol 20000 (PEG 20000) were fed via the side feeder.

[0038] 2. Specifically set the twin-screw extruder, that is, the temperature of the extruder is 80 to 210 degrees Celsius, and the screw speed is 1...

Embodiment 2

[0046] Example 2 Efficiency test of cleaning compounds for cleaning plastic molding machines and mixers according to the invention compared to polypropylene (PP) and commercial cleaning compounds.

[0047] Efficiency tests of the prepared purge compounds derived from Example 1 were carried out, comparing them simultaneously with common polypropylene (PP) and commercial purge compounds for cleaning plastic molding machines and mixers. An injection molding machine with a size of 65 tons, namely "Battenfeld HM65", was used in which the decontamination compound was injected into the mold to control the test environment at a similar stage. The mold measures 101.6 mm wide by 152.4 mm long by 3.175 mm thick.

[0048] To purge the injection molding machine, inject the purge compound into the mold 2 times:

[0049] A 1st purge was performed to test the efficiency of the purge compound derived from Example 1 for cleaning plastic molding machines and mixers to purge polypropylene (PP) a...

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Abstract

The invention discloses purging compound for cleaning plastic molding machine and mixing machine that works well in 200-350 degree Celsius. Purging compound for cleaning plastic molding machine and mixing machine according to this invention comprises thermoplastic; main plastic mixture that comprises high-density polyethylene (HDPE), polyethylene glycol 8000, and inorganic filler; and additive mixture that comprises low-density polyethylene (LDPE), polyethylene glycol 20000, and inorganic filler.

Description

technical field [0001] The present invention relates to the field of chemistry and polymers for the development of purification compounds for cleaning said plastic molding machines and mixers. Background technique [0002] In the manufacture of plastic resins, due to conversion of plastic materials and contamination of colorants, there is a large amount of waste during the manufacturing process, wherein a large amount of said waste affects manufacturing efficiency and profitability of the company. One of the acceptable decontamination methods for cleaning plastic molding machines and mixers is the use of decontamination compounds. [0003] Efficient cleaning of plastic molding machines and mixers is now very important due to rising resin prices; frequency of material, colorant and workpiece changes; increasing costs; and especially customer demands for fast production and specific types of products. The development of purification compounds for cleaning plastic molding mach...

Claims

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Application Information

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IPC IPC(8): B29C33/72
CPCB29C48/27B29C33/722B29C45/1753B29K2105/16B29K2101/12
Inventor 帕克彭·劳佳纳林·卡布松吉拉威特·琼卡瑟蔡亚普鲁克·科特佩奇苏帕奇·赫穆德
Owner PTT PUBLIC CO LTD