A kind of water-based self-drying/quick-drying sand casting coating and preparation method thereof

Abstract

The invention provides a water-based self-drying / quick-drying sand casting paint with fast drying speed, little / no pollution, safe use, low production cost and high sintering peeling rate and a preparation method. The present invention uses natural refractory materials such as zircon powder, chromite powder or zirconium-containing composite silicate powder as the base material without calcination or electric melting treatment, and adopts normal temperature curing type modified high molecular polymer as the main normal temperature Self-drying / low-temperature quick-drying binder, while using quick-drying silicate binder as the main high-temperature binder, using a high-efficiency composite suspension dispersant with high refractoriness and low thermal shrinkage, and adding an appropriate amount of high-efficiency Water reducer and defoamer to produce high solids (non-volatile content), low permeability water-based quick-drying / self-drying coatings for cast steel and cast iron series, which have excellent thixotropy and brushability and fast drying Performance, to achieve the purpose of saving energy, improving the environment, and improving the quality of castings. The invention can be applied to the field of casting coatings.

Description

technical field [0001] The invention relates to a sand casting coating, in particular to a water-based self-drying / quick-drying sand casting coating and a preparation method of the coating. Background technique [0002] Sand casting coatings are mainly divided into alcohol-based coatings and water-based coatings according to the type of solvent. [0003] At present, alcohol-based coatings using methanol, ethanol and isopropanol as solvents are widely used in China. They are ignited and burned immediately after application, and have the characteristics of fast curing and less labor-hour consumption. [0004] Ordinary water-based coatings that use tap water as a solvent are generally placed in a heating furnace for a long time to dry after application, or are baked with a natural gas, coal gas, or diesel flame spray gun. They are safe, reliable, convenient to transport, low in price, clean and pollution-free, Suspension and stable brushing performance and other characteristic...

AI Technical Summary

Problems solved by technology

[0005] However, alcohol-based coatings have the following problems: methanol is toxic and highly irritating to the human optic nerve, and long-term exposure of workers can easily lead to blindness in the eyes; although ethanol and isopropanol are non-toxic and odorless, they are volatile and volatile together with methanol. Inflammable and explosive Class A dangerous goods, safety accidents are prone to occur during the production, transportation, storage and use of coatings, which is not convenient for long-distance transportation and storage of products, and deteriorates safety production conditions; ethanol and methanol are also important automotive energy and basic chemical raw materials ;The suspension stability of the paint is poor, it does not have time thixotropy, the brush marks are serious when brushing, and it is difficult to level, and the organic components in it will produce toxic gas when the metal liquid is poured, the amount of gas is large, and the casting is prone to pore defects , but also pollute the working environment and affect the health of workers

The disadvantages of this coating are: the self-drying time is longer (5h), and the amount of gas generation is large

[0010] The drying speed of the above-mentioned one-component water-based self-drying / quick-drying coatings at home and abroad is relatively slow, and needs to be further improved