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A kind of preparation method of injection molding feeding material

An injection molding and feeding technology, which is applied in the direction of additive processing, etc., can solve the problems of bubbling, binder and powder wettable body shape retention is not ideal, and the green body is easily deformed.

Active Publication Date: 2020-06-30
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Metal powder injection molding has developed a variety of binder systems, but the performance is quite different
The wax-based binder system has low viscosity and high compaction strength, but the binder is volatile when mixed, resulting in phase separation and poor shape retention. If the thermal degreasing time is too long, cracks, bubbling, holes, Defects such as delamination; water-soluble system does not require organic solvents, but the powder loading is low, the injection range is narrow, the green body is easy to deform, and the sintering density is not high enough; gel system, water is easy to evaporate, degreasing speed is fast, and thick products can be produced , but the green strength is poor and easy to deform
[0004] Due to the poor molding fluidity of polymethyl acrylate in the binder, its application in metal injection molding is limited, and the wettability of the binder and powder and the shape retention of the green body are not ideal.

Method used

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  • A kind of preparation method of injection molding feeding material
  • A kind of preparation method of injection molding feeding material
  • A kind of preparation method of injection molding feeding material

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preparation example Construction

[0037] see figure 1 and figure 2 As shown, the present invention also provides a preparation method of injection molding feed, wherein there is a strong interaction between the stainless steel powder with amino and the epoxy-containing binder, and the preparation method at least includes the following steps:

[0038] S1 weighs 30-45% of methyl acrylate monomer, 3-11% of epoxy group-containing functional monomer and 50-56% of toluene solvent in the reaction vessel , such as a four-necked flask equipped with a stirrer, a thermometer, and a reflux condenser. In the reaction vessel, in order to prevent the oxidation of the monomer, nitrogen gas is passed through for 20-30 minutes to remove the air, and then methyl acrylate monomer and epoxy group-containing The total mass of the functional monomers is 0.5-1% of the azobisisobutyrocyanide initiator, and then continue to feed nitrogen, and carry out an oil bath at a constant temperature of 60-70°C for 7-8h to make the azobisisobut...

Embodiment 1

[0043] A kind of preparation method of injection molding feeding material is as follows:

[0044] (1) prepare the epoxy-containing polymer in the binder component

[0045] Use electronic balance to take by weighing 95.11g (41wt%) methyl acrylate monomer, 7.11g (3wt%) allyl glycidyl ether and 130g (56wt%) toluene and join in the four-wheel tank that stirrer, thermometer, reflux condenser tube are equipped with In the flask with nitrogen gas for 20 minutes to remove the air, add 1.02 g of azobisisobutylcyanide initiator (1% of the mass of the monomers used). Continue to feed nitrogen, and maintain a constant temperature oil bath at 70°C for 8h. After finishing the reaction, using methanol as a precipitating agent, the product is dropped dropwise into a sufficient amount of methanol solvent to precipitate the polymer. Subsequently, it was washed with methanol several times for purification, and dried in a vacuum oven at 70°C for 24 hours to obtain the epoxy group-containing pol...

Embodiment 2

[0051] A kind of preparation method of injection molding feeding material is as follows:

[0052] (1) prepare the epoxy-containing polymer in the binder component

[0053] Use electronic balance to take by weighing 90.11g (38wt%) methyl acrylate monomer, 14.22g (6wt%) allyl glycidyl ether and 132g (56wt%) toluene and join in the four-wheel tank that agitator, thermometer, reflux condenser tube are equipped with In the open flask, nitrogen was passed through for 20 minutes to remove the air, and then 1.03 g of azobisisobutylcyanide initiator (1% of the mass of the monomers used) was added. Continue to feed nitrogen, and keep the oil bath at a constant temperature of 70°C for 8h. After finishing the reaction, using methanol as a precipitating agent, the product is dropped dropwise into a sufficient amount of methanol solvent to precipitate the polymer. Subsequently, it was washed with methanol several times for purification, and dried in a vacuum oven at 70°C for 24 hours to o...

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Abstract

The invention discloses an injection molding feed composed of stainless steel powder with amino groups and binding agents containing epoxy groups and a preparation method, and relates to the technicalfield of injection molding of metal powder. The feed at least comprises the following raw materials: the stainless steel powder with amino groups on surfaces and the binding agents containing epoxy groups. The injection molding feed is prepared by using the surface-treated stainless steel powder with amino groups and the binding agents containing epoxy groups as the raw materials; in a feed preparation process, strong interaction occurs between the binding agents containing epoxy groups and the stainless steel powder with amino group, so that chemical bond connection is generated, the interaction force between two phases is enhanced, on the premise that good flowability of the feed is guaranteed, the purpose of increasing the green strength is achieved, after polyethylene glycol is degreased by water extraction, a pore passage is generated so as to transmit hot degreasing decomposition gas, and the green expansion is avoided; and green bodies do not have the defects of cracks, bubbles, holes and the like.

Description

technical field [0001] The invention belongs to the technical field of metal powder injection molding, in particular to a preparation method of injection molding feed. Background technique [0002] Metal Powder Injection Molding (MIM) is a new type of metal parts preparation technology, which combines the characteristics of plastic injection molding technology, powder metallurgy and investment casting technology, and can produce small and complex shapes. metal parts. Due to its many advantages, this technology is widely used in electronic products, medical equipment, military industry and other fields. [0003] Metal powder injection molding has developed a variety of binder systems, but the performance is quite different. The wax-based binder system has low viscosity and high compaction strength, but the binder is volatile when mixed, resulting in phase separation and poor shape retention. If the thermal degreasing time is too long, cracks, bubbling, holes, Defects such ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/22B22F1/00B33Y70/10
Inventor 任凤梅李烁周正发徐卫兵马海红冀晨冉赵青洋
Owner HEFEI UNIV OF TECH