Copolymer foamed plastic and preparation method thereof

A foamed plastic and copolymer technology, which is applied in the field of copolymer foamed plastics and its preparation, can solve the problem that the cost control of foamed plastics is not very ideal, and achieves the effects of wide density range, improved mechanical properties and heat resistance, and cost control.

Inactive Publication Date: 2011-04-20
保定美沃工程材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the cost control of this kind of foam plastic is not very ideal

Method used

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  • Copolymer foamed plastic and preparation method thereof
  • Copolymer foamed plastic and preparation method thereof

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preparation example Construction

[0033] The heat treatment process in step (4) of the preparation method of the copolymer foam plastic can also be divided into two stages or more than two stages, and the temperature of each stage is different. More preferably, the temperature in each stage is gradually increased. After this heat treatment stage, the copolymer foam can be made to have good heat resistance. This is because during this treatment, the chain segments of the polymerized monomer acrylonitrile will undergo a -CN condensation reaction to form a trapezoidal chain segment.

[0034] The preparation method of the copolymer foam in step (3) may also include a preheating step before the foaming step. The preheating step is to preheat the copolymer obtained in step (2) at 120 to 160° C. for 1 to 6 hours. This preheating step can shorten the time of steps (2) and (3) of the preparation method, further increase the molecular weight of the copolymer, and reduce the number of unreacted substances. The heat treatm...

Embodiment 1

[0050] Raw materials: 4100g of methacrylic acid, 5900g of acrylonitrile, 23g of tert-butyl peroxypivalate, 800g of pentanol, 100g of urea.

[0051] (1) Pour the ingredients into the container according to the above-mentioned ratio and mix them evenly to make a raw material liquid; then pour the raw material liquid into a flat container made of two flat inorganic glass sealed by rubber strips, outside of the flat plate Clamped by a clamp;

[0052] (2) Put the glass plate container filled with the raw material liquid into the strong circulating water bath device, and polymerize to form a transparent foamable transparent sheet copolymer under the condition of a water temperature of 55°C and a water bath for 50 hours;

[0053] (3) The foamable transparent sheet copolymer obtained in step (2) is freely foamed in strong circulating hot air at 200°C to prepare a copolymer foam;

[0054] (4) The copolymer foam obtained in step (3) is heat-treated at 140°C for 4 hours and then at 180°C for 6 h...

Embodiment 2

[0056] Raw materials: 6300 g of methacrylic acid, 3700 g of acrylonitrile, 9 g of tert-butyl peroxypivalate, 140 g of acrylamide, and 500 g of formamide.

[0057] (1) Pour the ingredients into the container according to the above-mentioned ratio and mix them evenly to make a raw material liquid; then pour the raw material liquid into a flat container made of two flat inorganic glass sealed by rubber strips, outside of the flat plate Clamped by a clamp;

[0058] (2) Put the glass plate container filled with the raw material liquid into the strong circulating water bath device, and polymerize to form a transparent foamable transparent sheet copolymer under the condition of a water temperature of 59°C and a water bath for 25 hours;

[0059] (3) The foamable transparent sheet copolymer obtained in step (2) is freely foamed in strong circulating hot air at 185°C to prepare a copolymer foam;

[0060] (4) The copolymer foam obtained in step (3) is heat-treated at 160°C for 7 hours, and the f...

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Abstract

The invention relates to copolymer foamed plastic and a preparation method thereof. The copolymer foamed plastic comprises the following raw materials in percentage by weight: 32-72 percent of methacrylic acid, 28-68 percent of acrylonitrile, 0.08-0.50 percent of initiator and 1.0-9.0 percent of foaming agent, wherein the initiator is selected from peroxidated organic acid ester. The method comprises the following preparation steps of: polymerizing for 22-72 hours at a water temperature of 35-65 DEG C; carrying out free foaming on the obtained foamable copolymerization slice in strong circulating heat air at 180-220 DEG C to prepare the copolymer foamed plastic; and carrying out heat treatment on the obtained copolymer foamed plastic in heat air at 120-180 DEG C for 4-12 hours. The acrylonitrile replaces methyl acrylonitrile with high price, and the peroxidated organic acid replaces an azoic compound, so that the cost is controlled and the property of the copolymer foamed plastic is guaranteed.

Description

Technical field [0001] The invention relates to a plastic and a preparation method thereof, in particular to a copolymer foam plastic and a preparation method thereof. Background technique [0002] In the structural design of resin matrix composites, sandwich structure composites are a typical light-weight, high-strength, high-modulus structural design scheme, which combines the high strength of panels (aluminum alloy, glass fiber, carbon fiber, and aramid fiber). Organically combined with the high modulus and the low density and high rigidity of the sandwich core, a lightweight, high-strength and high-rigidity structural composite material is formed, which is extremely useful in aircraft, rockets, radar, shipbuilding, transportation, medical equipment and other industries. Important application value. [0003] The sandwich materials used in sandwich structure composite materials mainly include honeycomb core material, balsa wood and foam plastic. The main types of foam plastics ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/20C08L33/02C08L33/24C08J9/14C08F220/06C08F220/48C08F4/34C08F4/38
Inventor 苑初明张一鸣张广成
Owner 保定美沃工程材料科技有限公司
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