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High-molecular foaming material and preparation method thereof

A technology of foaming materials and polymers, which is applied in the field of polymer foaming materials and its preparation, to achieve the effects of uniform and fine cells, high melt strength and good appearance quality

Inactive Publication Date: 2018-11-16
SHENZHEN POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no public report on using trifunctional epoxy resin for PA and directly extruding foam molding with exothermic chemical blowing agent

Method used

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  • High-molecular foaming material and preparation method thereof
  • High-molecular foaming material and preparation method thereof
  • High-molecular foaming material and preparation method thereof

Examples

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preparation example Construction

[0027]The preparation method of above-mentioned polymer foam material comprises the following steps:

[0028] mixing the base resin, cross-linking agent, foaming agent, cell nucleating agent, and antioxidant to form a mixture; and extruding or injecting the mixture into foam molding. The above steps may specifically include the following four methods:

[0029] 1. Mix the mixture of base resin, crosslinking agent, foaming agent, cell nucleating agent and antioxidant through a high-speed mixer at 30-60°C, and then feed the mixture into a single-screw extruder, twin-screw extruder Extrusion machine or injection molding machine for foam molding.

[0030] 2. Extrude the mixture of base resin, crosslinking agent, cell nucleating agent and antioxidant through a co-rotating parallel twin-screw extruder, then mix it with a foaming agent and pass it through a single-screw extruder, Twin-screw extruder or injection molding machine for foam molding.

[0031] 3. Mix the base resin, cros...

Embodiment 1

[0037] Formula: 1000g polycaprolactam (PA-6), 5g trifunctional epoxy resin (TDE-85, epoxy value 0.85eq / 100g) as crosslinking agent, 12g white carbon black as cell nucleating agent, 5g antioxidant 168.

[0038] First, mix the above-mentioned raw materials in a high-speed mixer. After the mixed above-mentioned raw materials are fully dried, they are put into a twin-screw extruder for granulation. The obtained granulated material is denoted as A. After the formamide foaming agent is mixed by a high-speed mixer, it is extruded and foamed through a rod die with a hole diameter of 2 mm in a single-screw extruder to obtain a foamed rod sample. The temperature of each section of the twin-screw extruder from the feeding hopper to the head area is kept as follows: 185°C (feeding section)—200°C—210°C—220°C—230°C—235°C—235°C—230°C (head section); the temperature of each section of the extruder from the hopper to the head is as follows: 175°C (feeding section) - 185°C - 200°C - 220°C - 23...

Embodiment 2

[0040] Formula: 1000g PA-6, 6.85g brominated trifunctional epoxy resin (bromine rate 46-50wt%, epoxy value 0.62eq / 100g) as crosslinking agent, 12g white carbon black as cell nucleating agent, 5g Antioxidants 168. This formula contains the same number of epoxy groups as the crosslinking agent in Example 1.

[0041] First, mix the above-mentioned raw materials in a high-speed mixer. After the mixed raw materials are fully dried, they are put into a twin-screw extruder for granulation. The obtained granulated material is denoted as B. After the amide foaming agent is uniformly mixed by a high-speed mixer, it is extruded and foamed through a rod die with a hole diameter of 2 mm in a single-screw extruder to obtain a foamed rod sample. The temperature of each section of the twin-screw extruder from the feeding hopper to the head area is kept as follows: 185°C (feeding section)—200°C—210°C—220°C—230°C—235°C—235°C—230°C (head section); the temperature of each section of the extrude...

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Abstract

The invention provides a high-molecular foaming material and a preparation method thereof. The high-molecular foaming material is prepared from base resin, a cross-linking agent, a foaming agent, a cell nucleating agent and an antioxidant, wherein the base resin is high-molecular resin or modified high-molecular resin having end groups with active hydrogen. Based on the total weight, the content of the base resin is 93.5-97.4 wt% by weight, the content of the cross-linking agent is 0.38-1.92 wt%, the content of the foaming agent is 0.94-1.93 wt%, the content of the cell nucleating agent is 1.14-2.31 wt%, and the content of the antioxidant is 0.09-0.48 wt%. The invention also provides the preparation method of the high-molecular foaming material. The foaming system has a flame-retardant property, and the high-molecular foaming material also has better apparent mass and foaming rate.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a polymer foam material and a preparation method thereof. Background technique [0002] As the second largest general-purpose engineering plastic, polyamide (PA) is widely used in automobiles and packaging due to its outstanding wear resistance, self-lubrication, oil resistance, fatigue resistance, good heat resistance, and gas barrier properties. , Electronic appliances, building materials and other industries. Especially the automotive industry. In order to reduce the weight of the car body, "replacing steel with plastic" or even "replacing solid parts with foam parts" has become the development trend of automotive plastics. PA foam has light weight, excellent high temperature resistance (wider heat and insulation temperature range than most foam materials), good heat insulation and sound insulation, excellent chemical corrosion resistance (especially re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L63/00C08K3/36C08J9/10B29C44/60B29C47/92B29C48/92
CPCB29C44/60C08J9/0061C08J9/0066C08J9/103C08J2201/03C08J2203/04C08J2377/02C08J2463/00
Inventor 徐志娟
Owner SHENZHEN POLYTECHNIC
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