Peroxide reaction method and peroxide reaction device using extruder

Patent metadata

Field	Value
Publication number	US-10875938-B2
Application number	US-201515740913-A
Country	US
Kind code	B2
Filing date	Jul 1, 2015
Priority date	Jul 1, 2015
Publication date	Dec 29, 2020
Grant date	Dec 29, 2020

Abstract

This invention is to improve the reaction efficiency of a peroxide introduced into a cylinder compared with conventional art. In the peroxide reaction method and peroxide reaction device using an extruder according to this invention, in which a peroxide and a raw material such as a synthetic resin, a natural resin, and an elastomer are introduced into a cylinder of the extruder, wherein the raw material and the peroxide are reacted with each other in the cylinder, the raw material is introduced from a raw material supply hopper, the peroxide is introduced from a downstream side of the raw material supply hopper, and the temperature of the raw material in a peroxide introduction portion is adjusted to a temperature lower than the one-minute half-life temperature of the peroxide.

First claim

The invention claimed is:

1. A peroxide reaction method comprising:
providing an extruder comprising a cylinder,
wherein the extruder has at least a solid transportation portion, a plasticization and kneading portion, and a melt transportation portion formed in the cylinder from an upstream side to a downstream side;

introducing a raw material into the extruder from a raw material supply hopper,
wherein the raw material is at least one selected from the group consisting of a synthetic resin, a natural resin, and an elastomer;

introducing a peroxide into the extruder at at least one peroxide introduction portion provided on a downstream side of the raw material supply hopper,
wherein at least one of the at least one peroxide introduction portions is positioned on an upstream side of an upstream position of both the melt transportation portion and the plasticization and kneading portion; and

adjusting a temperature of the raw material in the peroxide introduction portion to a temperature lower than a one-minute half-life temperature of the peroxide by adjusting the temperature of the cylinder,
wherein the peroxide and the raw material are introduced individually into the cylinder of the extruder without being mixed together in advance, and
wherein the raw material and the peroxide react with each other in the cylinder.

2. The peroxide reaction method using an extruder according to claim 1 , wherein the extruder is a twin screw extruder.

3. The peroxide reaction method using an extruder according to claim 1 , wherein the raw material is polypropylene or polyethylene.

4. The peroxide reaction method using an extruder according to claim 1 , wherein the one-minute half-life temperature of the peroxide is from 50° C. to 300° C.

5. The peroxide reaction method using an extruder according to claim 1 , wherein the one-minute half-life temperature of the peroxide is from 100° C. to 200° C.

Assignees

• Japan Steel Works Ltd

Inventors

• Ishikawa Makoto
• Takamoto Seiji
• Yata Kyohei
• Seo Mitsuhiro

Classifications

• B29B7/244 Primary

  of several materials · CPC title

• B29C48/297

  at several locations, e.g. using several hoppers or using a separate additive feeding · CPC title

• B29C48/83

  Heating or cooling the cylinders · CPC title

• B29B7/286

  measuring properties of the mixture, e.g. temperature, density (B29B7/283 takes precedence) · CPC title

• B29C48/29

  in liquid form · CPC title