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A kind of amino resin modified silica sol and preparation method thereof

An amino resin modification, amino resin technology, applied in the direction of manufacturing tools, casting molding equipment, metal processing equipment, etc., can solve problems such as mold shell cracking, and achieve small shell deformation, easy demoulding, and simple process. Effect

Active Publication Date: 2022-07-05
山东金亿达新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of preparing the shell during the implementation of this process, some technical difficulties are often encountered, such as cracking of the shell, etc.

Method used

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  • A kind of amino resin modified silica sol and preparation method thereof
  • A kind of amino resin modified silica sol and preparation method thereof
  • A kind of amino resin modified silica sol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] An amino resin-modified silica sol, the silica sol comprises an alkaline silica sol and an amino resin, and in terms of mass percentage, the amino resin accounts for 1%, and the balance is the alkaline silica sol.

[0027] The colloidal particle size of the alkaline silica sol is 10-20nm, pH9-11, SiO 2 Content 20-30%.

[0028] The preparation method of described amino resin is:

[0029] (1) add formaldehyde to the reaction kettle, be warming up to 35-40 ℃, add acid to adjust pH to be 5-6, add melamine according to the mass ratio of formaldehyde: melamine=20:1, and react at constant temperature for 10 min at 35-40 ℃; Mass ratio of formaldehyde: urea=5:1, adding urea, stirring continuously for 30min, then adding glyoxal according to mass ratio formaldehyde:glyoxal=10:1, fully reacting for 10min, to obtain a pre-reaction mixture;

[0030] (2) The temperature of the pre-reaction mixture was raised to 60-70°C, the polyamine crosslinking agent with a mass percentage of 0.1%...

Embodiment 2

[0039] An amino resin-modified silica sol, the silica sol comprises an alkaline silica sol and an amino resin, and in terms of mass percentage, the amino resin accounts for 2%, and the balance is the alkaline silica sol.

[0040] The colloidal particle size of the alkaline silica sol is 10-20nm, pH9-11, SiO 2 Content 20-30%.

[0041] The preparation method of described amino resin is:

[0042] (1) add formaldehyde to the reaction kettle, be warming up to 35-40 ℃, add acid to adjust pH to be 5-6, add melamine according to mass ratio formaldehyde: melamine=20:1, and react at constant temperature for 20min at 35-40 ℃; The mass ratio of formaldehyde: urea=5:1, adding urea, continuously stirring for 30min, then adding glyoxal according to the mass ratio formaldehyde:glyoxal=10:1, fully reacting for 20min, to obtain a pre-reaction mixture;

[0043] (2) The temperature of the pre-reaction mixture was raised to 60-70°C, and a polyamine crosslinking agent with a mass percentage of 0....

Embodiment 3

[0052] An amino resin-modified silica sol, the silica sol comprises an alkaline silica sol and an amino resin, and in terms of mass percentage, the amino resin accounts for 3%, and the balance is the alkaline silica sol.

[0053] The colloidal particle size of the alkaline silica sol is 10-20nm, pH9-11, SiO 2 Content 20-30%.

[0054] The preparation method of described amino resin is:

[0055] (1) add formaldehyde to the reaction kettle, be warming up to 35-40 ℃, add acid to adjust pH to be 5-6, add melamine according to mass ratio formaldehyde: melamine=20:1, and react at constant temperature for 20min at 35-40 ℃; The mass ratio of formaldehyde: urea=5:1, adding urea, continuously stirring for 30min, then adding glyoxal according to the mass ratio formaldehyde:glyoxal=10:1, fully reacting for 20min, to obtain a pre-reaction mixture;

[0056] (2) The temperature of the pre-reaction mixture was raised to 60-70°C, and a polyamine crosslinking agent with a mass percentage of 0.5%...

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Abstract

The invention discloses an amino resin modified silica sol and a preparation method thereof, belonging to the technical field of high-precision metal investment casting. The silica sol of the present invention comprises an alkaline silica sol and an amino resin, and in terms of mass percentage, the amino resin accounts for 1-5%, and the balance is the alkaline silica sol. In the present invention, an appropriate amount of amino resin is added to the traditional silica sol binder for modification, and the finally obtained mold shell has a normal temperature flexural strength of over 7 MPa, and a baking flexural strength of over 11 MPa. Greatly improve the wet strength and baking strength of the shell, reduce the residual strength, reduce the drying time, and the shell deformation is small, easy to demould, the surface of the casting is smooth, the process is simple and easy, suitable for large-scale promotion and application, with a wide range of economic benefits .

Description

technical field [0001] The invention belongs to the technical field of high-precision metal investment casting, and particularly relates to an amino resin-modified silica sol and a preparation method thereof. Background technique [0002] Investment casting refers to making wax samples with wax, wrapping multiple layers of refractory materials such as clay and binder on the surface, heating the wax to melt and flow out, thereby obtaining a mold shell formed of refractory materials, and then pouring the metal after melting. After the metal is cooled, the refractory material is broken into pieces to obtain metal parts. This process of processing metal is called investment casting, also known as investment casting or lost wax casting. The production process of investment casting is very complex, mainly including pressure design, wax film preparation, mold shell preparation, pouring, cleaning and heat treatment. At present, a lot of research on investment casting has been carrie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/18B22C9/04C08G12/38
CPCB22C1/186B22C9/04C08G12/38
Inventor 黄培伟梁裕辉康东岳张铁王俊林
Owner 山东金亿达新材料有限公司