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Water-soluble core mold material for forming filament-wound case and preparation method of same

A shell forming and water-soluble technology, which is applied in the field of water-soluble mandrels for filament winding shell forming and its preparation, can solve the problems of not meeting the requirements of integral forming and demoulding, low glass transition temperature and high glass transition temperature, Achieve the effect of small thermal expansion coefficient, good high temperature mechanical properties and low cost

Inactive Publication Date: 2015-01-14
中国航天科工集团第六研究院41所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a water-soluble mandrel with good water-soluble collapsibility, low glass transition temperature, high brittleness, and unsatisfactory integral molding and demolding requirements in the prior art. High transition temperature, good fracture toughness, and water-soluble mandrel material and preparation method suitable for filament winding shell molding

Method used

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preparation example Construction

[0023] The present invention will be described in further detail below. A method for preparing a water-soluble mandrel for forming a fiber-wound shell. The specific steps of the preparation method for the water-soluble mandrel are as follows:

[0024] (1) Prepare an aqueous solution of polyvinylpyrrolidone binder: add 10 to 50 wt.% of polyvinylpyrrolidone powder in water, stir thoroughly, and dissolve it completely to obtain an aqueous solution of polyvinylpyrrolidone binder;

[0025] (2) Prepare polyvinyl alcohol binder aqueous solution: add 5-20wt.% polyvinyl alcohol powder in water, fully stir, and make it dissolve completely, make the aqueous solution of polyvinyl alcohol binder;

[0026] (3) Composite composite binder aqueous solution: the polyvinylpyrrolidone binder aqueous solution prepared through step (1) and the polyvinyl alcohol binder aqueous solution prepared through step (2) are pressed according to the polyvinylpyrrolidone binder aqueous solution Accounting for...

Embodiment 1

[0033] PVP K30 and PVA 04-86 are respectively used as polyvinylpyrrolidone and polyvinyl alcohol binders, PVP K30 is prepared at a concentration of 20wt.%, and PVA 04-86 is prepared at a concentration of 10wt.%. The polyvinylpyrrolidone binder The aqueous solution and the polyvinyl alcohol binder aqueous solution are mixed according to the 20wt.% of the total mass of the polyvinylpyrrolidone binder aqueous solution, and 8Kg of quartz sand and 12Kg of hollow glass microspheres are weighed, and the prepared composite binder is added after stirring 3Kg, stirred on the mixer for 10min, put it into the core mold and compact it with a press, the pressure is 2MPa, the pressure holding time is 5min, then put it into the oven and increase the temperature to 110℃ at a rate of 1℃ / min, keep it warm After 30 hours, the mandrel is dried and solidified, and the mandrel forming tooling is disassembled, and then the surface of the mandrel is machined according to the design requirements of the ...

Embodiment 2

[0035]PVP K30 and PVA 0588 were respectively used as polyvinylpyrrolidone and polyvinyl alcohol binders, PVP K30 was prepared at a concentration of 40wt.%, and PVA 0588 was prepared at a concentration of 5wt.%. The aqueous solution of polyvinylpyrrolidone binder and polyethylene Alcohol binder aqueous solution accounts for the 50wt.% of total mass of polyvinylpyrrolidone binder aqueous solution and mixes standby, weighs 10Kg quartz sand and 10Kg hollow glass microspheres, after stirring, add the composite binder 2Kg prepared, in mixing Stir on the material machine for 30 minutes, put it into the core mold forming mold and compact it with a press, the pressure is 4MPa, the pressure holding time is 2min, then put it into the oven and increase the temperature to 110℃ at a rate of 0.5℃ / min, keep it warm for 20h, and the core mold After drying and curing, disassemble the mandrel molding tool, and then machine the surface of the mandrel according to the design requirements of the sha...

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Abstract

The invention relates to a water-soluble core mold material for forming a filament-wound case and a preparation method of the water-soluble core mold material. The water-soluble core mold material for forming the filament-wound case comprises composite binder aqueous solution and core mold packing, and the composite binder aqueous solution comprises polyvinyl pyrrolidone binder aqueous solution and polyvinyl alcohol binder aqueous solution. The polyvinyl pyrrolidone binder aqueous solution accounting for 20-80Wt% of the total mass of the composite binder aqueous solution is mixed with the polyvinyl alcohol binder aqueous solution to prepare the composite binder aqueous solution. The addition quantity of the water-soluble high-polymer binder aqueous solution is 0.05-0.5 time of the weight of the core mold packing. The preparation method includes steps of preparing the polyvinyl pyrrolidone binder aqueous solution; preparing the polyvinyl alcohol binder aqueous solution; preparing the composite binder aqueous solution; preparing the packing; mixing the materials; filling and forming; drying and solidifying; and demoulding and machining. The density and the compressive strength of a core mold prepared by the method can be adjusted according to service conditions, and the core mold is good in temperature resistance, room-temperature water-soluble collapsibility and fracture toughness, and is free of environmental pollution.

Description

technical field [0001] The invention relates to a water-soluble mandrel for forming a fiber-wound shell, in particular to a water-soluble mandrel for forming a fiber-wound shell and a preparation method thereof. Background technique [0002] In the manufacturing process of resin-based composite materials, metal is usually selected as the mold material, because metal has high thermal conductivity and good rigidity, and metal can be processed with good surface roughness, so the composite material manufactured in this way also has better surface roughness. However, metal also has some disadvantages as a mold material. For example, for large-scale components, the weight of the mold is too large and difficult to handle; in addition, processing a large metal mold requires high processing conditions, takes a long time, and the cost is also high. In the overall resin-based composite winding process, traditional metal molds can no longer meet the requirements of integral molding, m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L39/06C08L29/04C08K3/34C08K7/28B29C43/02B29C43/58B29B7/00
Inventor 赵学平陈孝鹏郭志兴张悦郭晓东
Owner 中国航天科工集团第六研究院41所
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