Preparation method of high-strength specially shaped PMI (polymethacrylimide) foam

A technology of polymethacrylimide and acrylimide, which is applied in the field of preparation of high-strength special-shaped polyacrylimide foam materials, can solve the problems of low bonding strength between boundaries, increased cost of special-shaped foam, and low particle yield and other problems, to achieve the effect of saving the time of foaming in the mold, fast preparation speed and good performance

Active Publication Date: 2018-05-29
CASHEM ADVANCED MATERIALS HI TECH CO LTD ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many defects in the above process: 1. The yield of poly(meth)acrylimide particles meeting the requirements obtained by crushing the polymer sheet is extremely low, which greatly increases the cost of preparing special-shaped foams, and even exceeds the cost of preparing special-shaped foams by machining. The cost of the foam; 2. Since there are boundaries between the particles of the foam in the mold, and the bonding strength between the boundaries is low, although it can be improved by means of adhesives, the performance of the final shaped foam is compared with the foam board. The performance drop is still very large

Method used

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  • Preparation method of high-strength specially shaped PMI (polymethacrylimide) foam
  • Preparation method of high-strength specially shaped PMI (polymethacrylimide) foam
  • Preparation method of high-strength specially shaped PMI (polymethacrylimide) foam

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Experimental program
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Effect test

Embodiment 1

[0052] (1) Prepolymerization: 50 parts by weight of (meth)acrylic acid, 50 parts by weight of (meth)acrylonitrile, 20 parts by weight of acrylamide, 8.5 parts by weight of polyether siloxane, 1 part by weight of foaming agent, medium and high temperature Add 0.6 parts by weight of initiator, 7.5 parts by weight of ricinoleol sodium salt of sulfonation, 8 parts by weight of crosslinking agent, and 8 parts by weight of styrene into the dispersion kettle, vacuumize, fill with nitrogen, remove the air in the kettle, and then continue Nitrogen flow, nitrogen flow rate 13mL / min, disperse the mixed solution evenly, and then stir while heating, the reaction temperature is 85°C, the stirring speed is 20r / min, and the reaction is 105min. The viscosity of the prepolymerized solution is 63mpa.s; reduce the temperature of the reaction solution to At 7°C, add 1 part by weight of a low-temperature initiator and stir to dissolve;

[0053] (2) Foaming: transfer the material liquid into the aut...

Embodiment 2

[0060] (1) Prepolymerization: 40 parts by weight of (meth)acrylic acid, 60 parts by weight of (meth)acrylonitrile, 10 parts by weight of methyl acrylate, 10 parts by weight of polyacrylamide, 2.5 parts by weight of foaming agent, and medium-high temperature initiation Add 0.7 parts by weight of agent, 8 parts by weight of sodium lauryl sulfate, 4 parts by weight of crosslinking agent, and 7.6 parts by weight of 4-acetoxystyrene into the dispersion kettle, vacuumize, fill with nitrogen, and get rid of the air in the kettle. Then continue to flow nitrogen, the nitrogen flow rate is 12mL / min, disperse the mixed solution evenly, and then stir while heating, the reaction temperature is 85°C, the stirring speed is 18r / min, and the reaction is 100min. The viscosity of the pre-polymerization liquid is 61mpa.s; reduce the reaction liquid When the temperature reaches 9°C, add 0.73 parts by weight of a low-temperature initiator and stir to dissolve;

[0061] (2) Foaming: add 7.5 parts by...

Embodiment 3

[0068] (1) Prepolymerization: 65 parts by weight of (meth)acrylic acid, 35 parts by weight of (meth)acrylonitrile, 15 parts by weight of maleimide, 8 parts by weight of polyvinyl alcohol, 3 parts by weight of foaming agent, Add 0.9 parts by weight of high-temperature initiator, 7 parts by weight of fatty alcohol polyoxyethylene ether sodium sulfate, 2 parts by weight of crosslinking agent, and 5 parts by weight of α-methylstyrene into the dispersion kettle, vacuumize, fill with nitrogen, and remove the Then continue to pass nitrogen, the nitrogen flow rate is 14mL / min, disperse the mixture evenly, and then stir while heating, the reaction temperature is 78°C, the stirring speed is 20r / min, the reaction is 120min, and the viscosity of the pre-polymerization liquid is 70mpa.s; Lower the temperature of the reaction solution to 8°C, add 0.4 parts by weight of a low-temperature initiator, and stir to dissolve;

[0069] (2) Foaming: add 5 parts by weight of magnesium carbonate in th...

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Abstract

The invention discloses a preparation method of high-strength specially shaped PMI (polymethacrylimide) foam. The method comprises the following steps: raw materials for preparing the PMI foam are added to a reactor, prepolymerization is performed under nitrogen protection, reaction temperature is reduced when viscosity of a reaction liquid reaches a default value, and a low temperature initiatoris added; the obtained reaction liquid is foamed; the foamed reaction liquid is injected into a mold under nitrogen protection; polymerization curing is performed by controlling foam curing temperature, the mold is taken apart, and a foam body is taken out; the taken-out foam body is transferred into a drying oven for post-curing; specially shaped PMI foam obtained by post-curing is placed into the mold again, micro-foaming is performed again, then cooling is performed, the mold is taken apart, and the high-strength specially shaped PMI foam is obtained. The high-strength specially shaped PMIfoam can be prepared efficiently with the method, cost for producing the specially shaped PMI foam at present is reduced greatly, efficiency and performance are improved, and the PMI foam can be applied to the fields of new-energy vehicles, bicycle hubs, propeller blades and the like where the specially shaped PMI foam is needed.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a preparation method of a high-strength special-shaped poly(meth)acrylimide foam material. Background technique [0002] PMI foam is one of the foams with the highest mechanical properties and heat resistance. Since Degussa commercially produced PMI foam in 1972, PMI has been used due to its high strength, high stiffness and excellent heat resistance and creep resistance. Performance, has been widely used in aerospace, transportation, wind power, ships and other fields. [0003] However, the PMI foam material currently on the market has only one form of sheet material, and this single product form limits its application range; Special-shaped foams that require high specific strength and high heat resistance, such as automobiles and propeller blades, have great advantages. However, the preparation of special-shaped PMI foams requires mechanical processing (such as cutti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/48C08F220/56C08F212/08C08F8/48C08J9/04C08J9/08C08J9/30
CPCC08F8/48C08F220/06C08F220/48C08J9/04C08J9/08C08J9/30C08J2203/02C08J2333/24C08F220/56C08F212/08
Inventor 徐文生李克迪孟佳丽方勇何永富
Owner CASHEM ADVANCED MATERIALS HI TECH CO LTD ZHEJIANG
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