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Method for improving ablation resistance of boron-containing phenolic resin-based composite material

A boron phenolic resin and composite material technology, which is applied in the field of high temperature resistant heat protection materials, can solve the problems of easy oxidation and erosion of boron phenolic resin-based composite materials, and achieves improved residual strength and ablation resistance, high mechanical strength and high mechanical strength. Effect of dimensional stability and high thermal residue rate

Inactive Publication Date: 2014-04-09
WUHAN UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The problem to be solved by the present invention is to provide a method for improving the ablation resistance of boron-phenolic resin-based composite materials in view of the problems that boron-phenolic resin-based composite materials are easily oxidized and corroded in a high-temperature aerobic environment

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  • Method for improving ablation resistance of boron-containing phenolic resin-based composite material
  • Method for improving ablation resistance of boron-containing phenolic resin-based composite material

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preparation example Construction

[0027] The invention provides a preparation method for improving the ablation resistance of a boron phenolic resin-based composite material, specifically: crushing and sieving the boron phenolic resin, and uniformly mixing the boron phenolic resin with boron oxide, boric acid and other powders by a solid phase method or a liquid phase method, The mass ratio of the two is 1:1 to 9:1; the solid phase method uses ball milling for 12 to 36 hours, and the liquid phase method uses an organic solvent to dissolve boron phenolic resin, and then stirs and mixes with a magnetic stirrer for 1 to 5 hours; The mixed powder or slurry is pretreated, and the pretreatment conditions are: treatment at 100-150°C for 1-10 hours; the pretreatment material is ground and sieved to obtain a composite powder of boron phenolic resin and boron oxide or boric acid, and then The composite powder is molded by a stepped temperature-rising molding process. The molding process is: hot pressing at 150-200°C unde...

Embodiment 1

[0031] (1) Mixing: crush the boron phenolic resin block into powder and pass through a 200-mesh sieve, then mix it with boron oxide powder with a particle size of less than 200 μm at a mass ratio of 9:1, and ball mill at a speed of 100 rpm for 36 hours ;

[0032] (2) Pretreatment: Treat the mixed powder at 100°C for 10 hours, grind it through a 200-mesh sieve, and obtain a composite powder of boron phenolic resin and boron oxide;

[0033] (3) Stair heating molding: the composite powder obtained by grinding and sieving after pretreatment is kept at 150°C for 3 hours under an axial pressure of 2 MPa, then heated to 180°C for 1 hour, and finally heated to 200°C for 1 hour; finally The boron-phenol-formaldehyde resin-based composite material is obtained by releasing the pressure and demolding with the furnace cooling. The obtained sample was heat-treated at 600°C for 2 hours in an air atmosphere. The thermal residual rate of the sample was 65%, the residual strength was 2.1 MPa, ...

Embodiment 2

[0035] (1) Mixing: crush the boron phenolic resin block into powder and pass through a 200-mesh sieve, then mix it with boron oxide powder with a particle size of less than 200 μm at a mass ratio of 4:1, and ball mill for 30 hours at a speed of 300 rpm ;

[0036] (2) Pretreatment: Treat the mixed powder at 110°C for 9 hours, and grind it through a 200-mesh sieve to obtain a composite powder of boron phenolic resin and boron oxide;

[0037] (3) Stair heating molding: the composite powder obtained by grinding and sieving after pretreatment is kept at 150°C for 2 hours under an axial pressure of 4 MPa, then heated to 180°C for 2 hours, and finally heated to 200°C for 1 hour; finally The boron-phenol-formaldehyde resin-based composite material is obtained by releasing the pressure and demolding with the furnace cooling. The obtained sample was heat-treated at 600°C for 2 hours in an air atmosphere. The thermal residual rate of the sample was 70%, the residual strength was 2.2 MPa...

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Abstract

The invention provides a method for improving ablation resistance of a boron-containing phenolic resin-based composite material. The method comprises the following steps of 1, breaking boron-containing phenolic resin, carrying out sieving, and mixing the boron-containing phenolic resin powder with boron oxide powder or boric acid powder by a solid phase method or a liquid phase method to obtain a uniform mixture according to a mass ratio of 1: 1 to 9: 1, wherein the solid phase method comprises ball milling mixing for 12-36h and the liquid phase method comprises dissolving the boron-containing phenolic resin in an organic solvent and carrying out stirring and mixing for 1-5h by a magnetic stirring device, 2, carrying out pre-treatment on the uniform mixed powder or slurry and carrying out grinding and sieving, and 3, molding the composite powder by a gradient heating molding technology, carrying out cooling in a furnace, and carrying out pressure-release demolding. Low-density and low-melting point boron oxide or boric acid powder is used as a filling material and the boron-containing phenolic resin-based composite material is prepared by physical blending hot mold pressing. The boron-containing phenolic resin-based composite material can keep a high heat retention rate, mechanical strength and size stability at a high temperature, has good heat protection performances and ablation resistance and can be used in the field of high-temperature thermal protection materials.

Description

technical field [0001] The invention belongs to the field of high-temperature-resistant thermal protection materials, in particular to a method for improving the ablation resistance of boron phenolic resin-based composite materials. Background technique [0002] In recent years, material technology has been greatly developed, and thermal protection material is a kind of heat-resistant material that is commonly used, and has been widely used in electrical appliances, steel, casting, machinery, electronics and other industries. For example, fireproof materials used in buildings to prevent losses due to fire. Also used in cutting-edge fields such as aerospace, the solid rocket motor insulation layer between the inner surface of the rocket motor casing and the propellant, its main function is to insulate the combustion chamber casing to protect the engine casing from high temperature damage. As another example, when the nose cone of an intercontinental missile re-enters the at...

Claims

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Application Information

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IPC IPC(8): C08L61/14C08K3/38B29C43/00
Inventor 沈强卢勤陈斐张联盟
Owner WUHAN UNIV OF TECH
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