Use of calcium aluminum phosphosilicate and its composite antirust pigment and preparation method

Abstract

The invention discloses the use of aluminum calcium phosphosilicate and its composite antirust pigment and its preparation method. The antirust pigment is made of the following raw materials in parts by weight: aluminum calcium phosphate 50-75, aluminum silicate 5-15, silicon Calcium acid 5‑15, filler 10‑30, additive 0.1‑5. The invention also discloses a preparation method of the calcium aluminum phosphosilicate composite antirust pigment, which includes the following steps: mixing at least three components of aluminum silicate, calcium silicate and calcium aluminum phosphate in all materials with water, and keeping the temperature at Between 20-100°C, keep stirring for 1.5-12 hours; add the rest of the material and mix evenly, then centrifugal dehydration, drying, and pulverization. The invention also discloses the use of calcium aluminum phosphosilicate in preparing antirust pigments. The antirust pigment of the invention has the characteristics of non-toxicity, environmental protection and high efficiency, and can completely replace the use of traditional toxic heavy metal antirust pigments such as red lead and zinc chrome yellow in industrial coatings.

Description

technical field [0001] The invention relates to the field of antirust pigments, in particular to the use of calcium aluminum phosphosilicate and its composite antirust pigment and a preparation method. Background technique [0002] For a long time, the performance and safety of anti-rust pigments in metal anti-corrosion coatings have been the focus of discussion and research, looking for efficient, safe and environmentally friendly lead and chrome anti-rust pigments (red lead, zinc chrome yellow) Effective substitutes have become an urgent problem to be solved in the pigment industry at home and abroad. So far, the non-lead and non-chromium pigments that have been studied include phosphates, molybdates, borates, ferrites, ion exchange pigments, etc. Among them, phosphate series pigments occupy a large proportion in terms of variety, performance and application range. a very important position. Typical examples of phosphate pigments are zinc phosphate developed by Harrison ...

AI Technical Summary

Problems solved by technology

Long-term application practice shows that both pigments have the following disadvantages: low water solubility, poor early rust resistance, especially in water-based paints, cannot well overcome the early "flash rust" problem

[0004] At present, the phosphate composite antirust pigments on the market at home and abroad mainly include composite zinc phosphate and modified zinc phosphate, aluminum tripolyphosphate and modified aluminum tripolyphosphate, zinc phosphomolybdate, zinc iron phosphate and phosphite Composite pigments, etc., but there is no report about calcium aluminum phosphosilicate as an antirust pigment

Moreover, the main material elements of terminal products in foreign developed countries are phosphorus, aluminum, and zinc. The cost of these raw materials is generally high, which limits their popularization and application.