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Composite coating for cast iron valves and preparation and coating method thereof

A composite coating and valve technology, applied in coatings, wax coatings, devices for coating liquids on surfaces, etc., can solve the problems of easy cracking, wear resistance and poor heat resistance, and improve wear resistance. and heat resistance, uniform coating thickness, and the effect of extending the application range

Active Publication Date: 2016-12-07
ANHUI TONGLING KELI VALVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the acid resistance, alkali resistance and salt resistance have been improved compared with the traditional process, the wear resistance and heat resistance are not good, and it is easily broken by impact.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: be used for the composite coating of cast iron valve, it comprises by weight: 10 parts of silicon dioxide, 25 parts of polyethylene wax, 2 parts of silicon carbide, 4 parts of sodium stannate, 20 parts of Paraffin wax, 2 parts titanium dioxide, 6 parts rosin, 4 parts zinc oxide, 12 parts ceramic powder and 3 parts phenolic resin.

[0012] A method for preparing a composite coating for cast iron valves, which includes the following steps: (1), preparation of a mixture: 12 parts of ceramic powder, 6 parts of rosin and 4 parts of zinc oxide are mixed and ground into powder evenly Preheat the mixture to 200°C at a speed of 4°C / min and keep it warm for 10 minutes, then stir it at a speed of 80r / min at 2MPa for 20 minutes to form a mixture; (2) Preparation of rubber: 3 parts of phenolic resin, 10 parts of silicon dioxide, 25 parts of polyethylene wax and 2 parts of silicon carbide are mixed evenly and ground into a powder mixture, which is put into an internal m...

Embodiment 2

[0013] Embodiment 2: be used for the composite coating of cast iron valve, it comprises by weight: 15 parts of silicon dioxide, 30 parts of polyethylene wax, 3 parts of silicon carbide, 6 parts of sodium stannate, 25 parts of Paraffin wax, 4 parts of titanium dioxide, 8 parts of rosin, 6 parts of zinc oxide, 14 parts of ceramic powder and 5 parts of phenolic resin.

[0014] A method for preparing a composite coating for cast iron valves, which includes the following steps: (1), preparation of a mixture: 14 parts of ceramic powder, 8 parts of rosin and 6 parts of zinc oxide are mixed and ground into powder evenly Preheat the mixture to 225°C at a rate of 5°C / min and keep it warm for 15 minutes, then stir it at a rate of 90r / min at 3MPa for 25 minutes to form a mixture; (2) Preparation of the rubber compound: 5 parts of phenolic resin, 15 parts of silicon dioxide, 30 parts of polyethylene wax and 3 parts of silicon carbide were mixed and evenly ground into a powdery mixture, whi...

Embodiment 3

[0015] Embodiment 3: be used for the composite coating of cast iron valve, it comprises by weight: 20 parts of silicon dioxide, 35 parts of polyethylene wax, 4 parts of silicon carbide, 8 parts of sodium stannate, 30 parts of Paraffin wax, 6 parts of titanium dioxide, 10 parts of rosin, 8 parts of zinc oxide, 16 parts of ceramic powder and 7 parts of phenolic resin.

[0016] A method for preparing a composite coating for cast iron valves, which includes the following steps: (1), preparation of a mixture: 16 parts of ceramic powder, 10 parts of rosin and 8 parts of zinc oxide are mixed and ground into powder evenly Preheat the mixture to 250°C at a rate of 6°C / min and keep it warm for 20 minutes, then stir it at a rate of 100r / min at 4MPa for 30 minutes to form a mixture; (2) Preparation of the rubber compound: 7 parts of phenolic resin, 20 parts of silicon dioxide, 35 parts of polyethylene wax and 4 parts of silicon carbide are mixed and ground into a powdery mixture, and put ...

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PUM

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Abstract

The invention discloses a composite coating for cast iron valves and a preparation and coating method thereof. The composite coating comprises the following components in parts by weight: 10 to 20 parts of silicon dioxide, 25 to 35 parts of polyethylene wax, 2 to 4 parts of silicon carbide, 4 to 8 parts of sodium stannate, 20 to 30 parts of paraffin, 2 to 6 parts of titanium dioxide, 6 to 10 parts of rosin, 4 to 8 parts of zinc oxide, 12 to 16 parts of ceramic powder, and 3 to 7 parts f phenolic resin. The coating has the advantages that ceramic powder is used to replace epoxy resin and is taken as the main component of the coating, the wear resistant performance and heat resistant performance of the coating are both enhanced therefore, moreover, the coating has certain toughness and is capable of resisting strong impact and preventing being broken, and thus the application range of cast iron valves is enlarged.

Description

technical field [0001] The invention relates to a valve inner surface treatment process, in particular to a composite coating for cast iron valves and a preparation and coating method thereof. Background technique [0002] A valve (famen) is a control component in a fluid delivery system, with functions such as cut-off, regulation, flow diversion, reverse flow prevention, pressure stabilization, diversion or overflow pressure relief. Valves used in fluid control systems range from the simplest cut-off valves to various valves used in extremely complex automatic control systems, with a wide variety of varieties and specifications. Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. Valves are also divided into cast iron valves, cast steel valves, stainless steel valves (201, 304, 316, etc.), chrome-molybdenum steel valves, chrome-molybdenum-vanadium steel valves, d...

Claims

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Application Information

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IPC IPC(8): C09D123/06C09D191/06C09D7/12B05D7/14B05D7/24B05D3/02
CPCB05D3/0254B05D7/14B05D7/24B05D2202/10B05D2518/00B05D2601/20B05D2601/24C08L2205/035C09D7/61C09D123/06C08L91/06C08L93/04C08L61/06C08K3/36C08K3/34C08K3/24C08K2003/2241C08K2003/2296B05D2401/40
Inventor 汪军平
Owner ANHUI TONGLING KELI VALVE
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