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Production method of high-strength polymethacrylimide modified phenolic resin foam
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A polymethacrylimide and phenolic resin foam technology, applied in the field of polymer organic compounds, can solve the problems of brittleness and low mechanical processing performance, and achieve the effects of high strength, overcoming brittleness and increasing toughness
Inactive Publication Date: 2014-04-30
湖南中野高科技特种材料有限公司
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[0003] The technical problem to be solved in the present invention is to provide a production method of high-strength polymethacrylimide modified phenolic resin foam for the defects of brittleness and low mechanical processability existing in the existing foam. Add polymethacrylimide cyclic structure to graft phenolic resin to form a copolymer to achieve modification, and then realize the preparation and production of high-strength polymethacrylimide modified phenolic resin with excellent mechanical properties Foam
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[0031] (2) Put the methacrylic acid, methacrylonitrile, magnesiumoxide, azobisisobutyronitrile and tert-butyl benzoate in parts by weight prepared in the step (1) into the reaction kettle. Raise the temperature to 70-80°C and keep the temperature for 5h. During this period, the carbon-carbon double bond in methacrylic acid in the reactor reacts with the carbon-carbon double bond in methacrylonitrile to generate polymethacrylimide, and the reaction formula is as follows:
[0032]
[0033] In the formula:
[0034] is methacrylonitrile,
[0035] for methacrylic acid,
[0036] It is polymethacrylimide;
[0037] (3) Control the temperature in the reaction kettle to 60-70°C, put the phenol, sodiumhydroxide and water prepared in step (1) into the above-mentioned reaction kettle and mix and stir for 1 hour. During this period, take the step (1) three times. The prepared paraformaldehyde in parts by weight is put into the ...
[0053] Steps (2)~(3) are the same as in Example 1;
[0054] (4) Raise the temperature in the above reactor to 85°C, then put the polymethacrylimide obtained in step (2) into the reactor, the amount of polymethacrylimide added in step (3) 10% of the weight of the cast phenol. Raise the temperature in the reactor to 95°C to carry out condensation polymerization of hydroxymethylphenol, the reaction time is 1h, the reaction formula of the condensation polymerization of methylolphenol is as follows:
[0055]
[0056] In the formula: is hydroxymethylphenol, for phenol,
[0057] Phenolic resin with linear structure, H 2 O is water,
[0058]
[0059] Polymethacrylimide is a linear structure,
[0060] It is polymethacrylimide;
[0061] (5), 70 parts of vacuum dehydration, cooled to room temperature to obtain polymethacrylimide modified phenolic resin;
[0062] (6) Take 100kg of modified phenolic resin obtained in step (...
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Abstract
The invention discloses a production method of high-strength polymethacrylimide modified phenolic resin foam. The production method adopts the following raw materials and steps: (1) preparing methacrylic acid, methacrylonitrile, magnesiumoxide, azobisisobutyronitrile, tert-butyl ester benzoate, phenol, paraformaldehyde, sodiumhydroxide and water; (2) putting the methacrylic acid, the methacrylonitrile, the magnesiumoxide, the azobisisobutyronitrile and the tert-butyl ester benzoate into a reaction kettle; (3) adding the phenol, sodiumhydroxide and water; (4) adding the polymethacrylimide; (5) performing vacuum dehydration; and (6) injecting into a mold. According to the method, active sites on hydroxymethylphenol are used, and through crosslinking and copolymerization of grafting and chemical bonds, the polymethacrylimide is introduced to modify phenolic resin, so that the tenacity is increased, the mechanical properties are promoted, and the product has a higher strength.
Description
technical field [0001] The invention belongs to the technical field of macromolecular organic compounds, and relates to a production method of high-strength polymethacrylimide modified phenolic resin foam. Background technique [0002] Phenolic resin is a collective name for resins obtained by polycondensation of phenolic and aldehyde compounds. The raw materials are easy to obtain, the cost is low, and the production process and equipment are simple. Phenolic foam products have good heat resistance, cold resistance, dimensional stability, molding Processability, low smoke and flame retardancy. However, the brittleness and mechanical strength of the existing phenolic foam have not been well resolved. PMI (the abbreviation of "Polymethacrylimide" in English, and the Chinese translation is "polymethacrylimide") as a new type of material has a 100% closed-cell structure, and has excellent heat resistance, mechanical properties and compression creep properties. , the strength ...
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