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Plastic foam material and preparation method thereof

A foaming material and plastic technology, applied in the field of plastic foaming material and its preparation, can solve the problems of high equipment cost, complicated control, low resin melt strength, etc., and achieve the effect of improving quality and improving melt strength

Inactive Publication Date: 2014-06-25
SHENZHEN POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the physical foaming method needs to add gas generators, gas pumping devices, air pressure or flow adjustment control devices, etc. to the extrusion equipment or injection molding equipment, the equipment cost is high, and the control is more complicated; The melt strength is not high, and it needs to be modified to improve the melt strength first, mainly by crosslinking or blending and grafting, and the modification process is more complicated
The chemical foaming agent also has the above-mentioned modification problem of low resin melt strength, and because the chemical foaming agent considers that its gas generation temperature should be compatible with the melting and decomposition temperature of the resin, there is not much choice
[0003] Usually, in the process of polymer foam molding, the foaming agent mainly uses chemical foaming agents such as AC (azodicarbonamide) or CO 2 , butane, freon and other physical foaming agents, the foaming agent generally only plays the role of providing foaming gas in foam molding, and cannot act as a crosslinking agent at the same time

Method used

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  • Plastic foam material and preparation method thereof
  • Plastic foam material and preparation method thereof
  • Plastic foam material and preparation method thereof

Examples

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preparation example Construction

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

[0028] mixing the base resin, the reactive blowing agent, and the cell nucleating agent to form a mixture; and

[0029] The mixture is extruded or injection foamed.

[0030] Among them, the mixture of base resin, reactive foaming agent and cell nucleating agent can be mixed by a high-speed mixer at 30-60°C, and then added to a single-screw extruder, twin-screw extruder or injection molding machine for foaming forming.

[0031] The mixture of base resin, reactive foaming agent, and cell nucleating agent can be extruded and granulated at low temperature through a co-rotating parallel twin-screw extruder, and then foamed by a single-screw extruder or an injection molding machine. Low temperature means below the deblocking temperature of the blocked isocyanate prepolymer.

[0032] The mixture of base resin, reactive foaming agent, and cell nucleating agent can be ground a...

Embodiment 1

[0043] Recipe: polylactic acid (PLA): 1000g, reactive foaming agent B (unblocking temperature is higher than reactive foaming agent A): 30g, cell nucleating agent silica: 4g, according to the above formula, start at high speed After mixing in the mixer, put it into the twin-screw extruder for granulation. The temperature of each section of the twin-screw extruder from the feeding hopper to the head area is kept as follows: 125°C (feeding section)—140°C—150°C—165°C— 170°C—170°C—170°C—165°C (head section). Mold the granulated polylactic acid particles on a flat vulcanizing machine at 195°C (higher than the unblocking temperature of the reactive foaming agent) (without venting), and the photos of the plates are as follows: figure 1 .

Embodiment 2

[0045] Formula: polylactic acid (PLA): 1000g, reactive foaming agent A: 60g, cell nucleating agent white carbon black: 6g, according to the above formula, first mix in a high-speed mixer, put it into a single-screw extruder through the sheet extruder head to obtain foam sheet, the temperature of each section from the feeding hopper of the extruder to the head area is maintained as follows: 130°C (feeding section) - 150°C - 160°C - 175°C - 175°C - 165°C ( head section).

[0046] Adopt the extruding speed of 30rpm to obtain polylactic acid foam sheet material photo as figure 2 , The foaming ratio is about 2 times.

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Abstract

The invention provides a plastic foam material and a preparation method thereof. The plastic foam material is prepared from base resin, a reaction type foaming agent and a cell nucleating agent, wherein the base resin is polymer resin or modified polymer resin with an end group with reactive hydrogen; in terms of total weight, the content of the base resin is 78.7-97.8%, the content of the reaction type foaming agent is 2.0-19.7%, and the content of the cell nucleating agent is 0.2-1.6%. The invention also provides a preparation method of the plastic foam material. The plastic foam material has better quality.

Description

【Technical field】 [0001] The invention relates to the field of foam molding of polymer materials, in particular to a plastic foam material and a preparation method thereof, which uses polymer resin or modified polymer resin with active hydrogen at the end The functional blowing agent is a blowing agent. 【Background technique】 [0002] The method of manufacturing polymer foam material can be physical foaming and chemical foaming. Among them, the physical foaming method needs to add gas generators, gas pumping devices, air pressure or flow adjustment control devices, etc. to the extrusion equipment or injection molding equipment, the equipment cost is high, and the control is more complicated; The melt strength is not high, and it needs to be modified to improve the melt strength first, mainly by crosslinking, blending and grafting, and the modification process is more complicated. The chemical foaming agent also has the above-mentioned problem of low melt strength of the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08L67/04C08L77/00C08L67/02C08L71/08C08L59/00C08L23/00C08L23/26C08J9/08
CPCC08L23/0853C08L23/26C08L59/00C08L67/02C08L67/04C08L71/02C08L77/00C08L2203/14C08L2205/03C08L2205/035C08L2205/05C08L75/04C08K3/36
Inventor 徐志娟林雪春
Owner SHENZHEN POLYTECHNIC
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