CN103044995A

CN103044995A - High temperature coating for diesel engine exhaust air duct

Info

Publication number: CN103044995A
Application number: CN2013100294049A
Authority: CN
Inventors: 陈立晓
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-01-28
Filing date: 2013-01-28
Publication date: 2013-04-17

Abstract

The invention belongs to the technical filed of coating production, and in particular relates to a high temperature coating for a diesel engine exhaust air duct. The water-based high temperature coating is prepared from the following preferable raw materials by weight percent: 30% of long-chain polyphosphoric acid, 10% of aluminum hydroxide, 5% of chromic anhydride, 5% of zinc phosphate, 20% of aluminium powder, 8% of mica powder, and the rest of distilled water. The prepared water-based high temperature anticorrosive coating has good anticorrosion and anti-rust properties, oil resistance, acid and alkali resistance, and heatproof radiativity, and can be used over a long period of time at 700 DEG C, so that the defects that the traditional anticorrosive coating for the diesel engine exhaust air duct cannot be used at high temperature due to poor acid and alkali resistance, contains benzene solution, has high toxicity, pollutes the environment seriously and the like are overcome. Now environment protection becomes more and more important, so that the high temperature coating is more preferable and more likely to be accepted and used by people, and is in accordance with the coating development tendency in and abroad.

Description

A kind of exhaust duct of diesel engine high-temperature coatings

Technical field

The invention belongs to the coating material production technical field, especially a kind of exhaust duct of diesel engine high-temperature coatings.

Background technology

Temperature during exhaust duct of diesel engine work is along with Efficiency of Diesel Engine improves constantly, and temperature is also more and more higher, can reach 500～600 ℃.The coating performance of gas exhaust duct protective cover descends along with the increase of temperature, and under the washing away of high-temperature fuel gas stream, sticking power and weathering resistance variation have been accelerated the corrosion failure of pipeline.The exhaust duct of diesel engine protective cover is mainly take high-temperature resistant silicone class coating as main now; at high temperature silicone resin easily decomposes; the phenomenon such as air entrapment, slight crack occur, peel off causes pipeline to get rusty or oxidation, can not satisfy at present the exhaust duct of diesel engine requirement in work-ing life.High-temperature resistant coating is widely used in the various fields such as automobile, building, metallurgy, production, and in the daily necessities such as gas-cooker, water-heater, electric space heating appliance, and is closely bound up with daily life, industrial production.High-temperature resistant coating is given full play to the function of many products and equipment with its special performance, becomes indispensable new variety in the coatings industry.Present high-temperature resistant coating development trend is that energy saving and environment friendly oligosaprobic aqueous high-temperature-resistant coating is generally considered and will finally replaces solvent type high-temperature resistant coating.

Summary of the invention

The object of the invention is to overcome the deficiency of high-temperature coatings aspect anticorrosion, heatproof, environmental-protecting performance that is applied in now on the exhaust duct of diesel engine, propose a kind of aqueous high-temperature-resistant coating of environmental protection type low pollution.

Technical solution of the present invention is as follows:

1, a kind of exhaust duct of diesel engine high-temperature coatings, it is characterized in that, the starting material of preparation high-temperature coatings consist of (according to the % by weight meter): long-chain polyphosphoric acid 30～40, aluminium hydroxide 10, chromic trioxide 5, zinc phosphate 5, aluminium powder 10～20, mica powder 8, all the other are distilled water.

2, a kind of exhaust duct of diesel engine high-temperature coatings is characterized in that, its production method is:

1. the long-chain polyphosphoric acid during the starting material that prepare high-temperature coatings form: working concentration is 85% PHOSPHORIC ACID TECH.GRADE, and adding phosphoric anhydride is that 150 ℃ of lower reactions made the long-chain polyphosphoric acid in 1 hour in temperature.

2. in the long-chain polyphosphoric acid aqueous solution, add aluminium hydroxide and react the main film forming matter aluminium dihydrogen phosphate base-material that made coating in 1 hour, cool to room temperature at 120 ℃.

3. the aluminium powder that adds sanitas chromic trioxide, zinc phosphate and high-temperature stabiliser mica powder and particle diameter 5～10 μ m in base-material is with mixing solutions high speed dispersion, filtration, can finished product.

The water-based high-temperature resistant anticorrosive coating that makes, have preferably antiseptic and rustproof property, oil-proofness, resistance to acids and bases and resistance to heat emission, can under 700 ℃ environment, use for a long time, thereby the resistance to acids and bases that has solved traditional protective system that exhaust duct of diesel engine uses is poor can not under hot conditions, not use and contain benzene kind solvent, toxicity is larger, environment is had the deficiencies such as severe contamination.In today that environmental protection problem is given prominence to, it has more superiority, more can be that people accept and use, meet the trend of international and domestic paint development.

Embodiment:

Concrete preferential embodiment of the present invention:

1, a kind of exhaust duct of diesel engine high-temperature coatings is characterized in that, the starting material of preparation high-temperature coatings consist of (according to the % by weight meter): long-chain polyphosphoric acid 30, aluminium hydroxide 10, chromic trioxide 5, zinc phosphate 5, aluminium powder 20, mica powder 8, all the other are distilled water.

2, production method is: add aluminium hydroxide made coating in 1 hour 120 ℃ of reactions main film forming matter aluminium dihydrogen phosphate base-material in the long-chain polyphosphoric acid aqueous solution, the aluminium powder that adds sanitas chromic trioxide, zinc phosphate and high-temperature stabiliser mica powder and particle diameter 5～10 μ m behind the cool to room temperature in base-material is with mixing solutions high speed dispersion, filtration, can finished product.

Claims

1. exhaust duct of diesel engine high-temperature coatings, it is characterized in that, the starting material of preparation high-temperature coatings consist of (according to the % by weight meter): long-chain polyphosphoric acid 30～40, aluminium hydroxide 10, chromic trioxide 5, zinc phosphate 5, aluminium powder 10～20, mica powder 8, all the other are distilled water.

2. an exhaust duct of diesel engine high-temperature coatings is characterized in that, its production method is:

1. the long-chain polyphosphoric acid during the starting material that prepare high-temperature coatings form: working concentration is 85% PHOSPHORIC ACID TECH.GRADE, and adding phosphoric anhydride is that 150 ℃ of lower reactions made the long-chain polyphosphoric acid in 1 hour in temperature;

2. in the long-chain polyphosphoric acid aqueous solution, add aluminium hydroxide and react the main film forming matter aluminium dihydrogen phosphate base-material that made coating in 1 hour, cool to room temperature at 120 ℃;