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Lost-wax composition for precision casting and method for making pattern for precision casting

A technology of precision casting and wax composition, which is applied in the direction of casting molding equipment, molds, mold components, etc., and can solve problems such as low fluidity and cracks

Inactive Publication Date: 2009-09-23
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this additive (hereinafter referred to as filler) has a certain effect in reducing the solidification shrinkage rate and improving the concave surface, it often produces cracks (shell cracks) on the model when the wax model is dissolved out to manufacture the model, and its fluidity low, so it is difficult to efficiently manufacture castings

Method used

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  • Lost-wax composition for precision casting and method for making pattern for precision casting
  • Lost-wax composition for precision casting and method for making pattern for precision casting
  • Lost-wax composition for precision casting and method for making pattern for precision casting

Examples

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example 1

[0061] The metallocene compound represented by the above general formula (1), for example, when the transition metal has an atomic valence of 4, can be more specifically represented by the following general formula (2).

[0062] R 2 k R 3 l R 4 m R 5 n m 1 …(2)

[0063] where M 1 is a transition metal selected from group 4 of the periodic table, R 2 Is a group (ligand) with a cyclopentadienyl skeleton, R 3 , R 4 and R 5 Each independently represents a group (ligand) having or not having a cyclopentadienyl skeleton. K is an integer of 1 or more, and k+l+m+n=4.

[0064] m 1 Examples of metallocene compounds that are zirconium and contain at least two ligands having a cyclopentadienyl skeleton are listed below. Bis(cyclopentadienyl)zirconium monochloromonohydride, bis(cyclopentadienyl)zirconium dichloride, bis(1-methyl-3-butylcyclopentadienyl)zirconium bis(trifluoromethanesulfonate salt), bis(1,3-dimethylcyclopentadienyl)zirconium dichloride, etc.

[006...

example 2

[0069] Examples of metallocene compounds include metallocene compounds represented by the following general formula (3) described in JP-A-4-268307.

[0070]

[0071] In the formula, M 1 It is a transition metal of Group 4 of the periodic table, and specific examples thereof include titanium, zirconium, and hafnium.

[0072] R11 and R 12 They may be the same or different from each other, and are a hydrogen atom, an alkyl group with 1 to 10 carbon atoms, an alkoxy group with 1 to 10 carbon atoms, an aryl group with 6 to 10 carbon atoms, and an aryl group with 6 to 10 carbon atoms. Aryloxy group with 10 carbon atoms, alkenyl group with 2 to 10 carbon atoms, arylalkyl group with 7 to 40 carbon atoms, alkylaryl group with 7 to 40 carbon atoms, and 8 to 40 carbon atoms 40 aryl alkenyl, or halogen atom, R 11 and R 12 Chlorine atoms are preferred.

[0073] R 13 and R 14 They may be the same or different from each other, and are a hydrogen atom, a halogen atom, an alkyl group...

example 3

[0081] As the metallocene compound, a metallocene compound represented by the following general formula (4) can be used.

[0082]

[0083] In formula (4), M 3 Represents a transition metal atom of Group 4 of the periodic table, specifically titanium, zirconium, and hafnium. R 24 and R 25 May be the same or different from each other, and represent a hydrogen atom, a halogen atom, a hydrocarbon group with 1 to 20 carbon atoms, a halogenated hydrocarbon group with 1 to 20 carbon atoms, a silicon-containing group, an oxygen-containing group, a sulfur-containing group, Nitrogen-containing groups or phosphorus-containing groups. R 24 It is preferably a hydrocarbon group, and particularly preferably an alkyl group having 1 to 3 carbon atoms, such as a methyl group, an ethyl group, or a propyl group. R 25 It is preferably a hydrogen atom or a hydrocarbon group, and particularly preferably a hydrogen atom or an alkyl group having 1 to 3 carbon atoms such as a methyl group, an ...

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Abstract

Disclosed is a polyethylene wax defined by the features (i) to (iv): (i) said polyethylene wax is an ethylene homopolymer or a copolymer of ethylene and an alpha-olefin of 3 to 20 carbon atoms, (ii) a ratio (Mw / Mn) of the weight-average molecular weight (Mw) to the number-average molecular weight (Mn), as measured by GPC, is in the range of 1.7 to 4.0, (iii) the softening point is not higher than 125 DEG C., and (iv) the penetration hardness is not more than 15 dmm. Also disclosed are a lost wax composition for precision casting, which comprises the polyethylene wax, and a method for forming a model for precision casting, which uses the lost wax composition for precision casting.

Description

[0001] This application is the applicant's International Application No. PCT / JP2004 / 009050 (200480017722.2) filed on June 21, 2004, and the title of the invention is "polyethylene-based wax, lost wax composition for precision casting containing it, and A divisional application of the international application of "method for making a model". technical field [0002] The present invention relates to a polyethylene-based wax having low shrinkage, high hardness and low stickiness, a lost-wax composition used when producing a model for investment casting by a lost-wax casting method, and an investment casting using the lost-wax composition How the model is made. Background technique [0003] Polyethylene-based waxes are widely used in various applications such as dispersants, modifiers, ink additives, and release agents for toners for electrophotographic printing. Polyethylene-based wax with high shrinkage rate, high hardness and low stickiness. [0004] As a method for produci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/04B22C7/02B22C9/04
Inventor 依田真树丰田英雄菅广次郎宇於崎浩隆
Owner MITSUI CHEM INC
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