New development trend of the hottest lotion coatin

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New development trend of lotion coatings

the history of liquid polymerization has been more than 80 years. At present, in addition to conventional lotion polymerization, there are seed lotion polymerization, core-shell lotion polymerization, soap free lotion polymerization, microemulsion polymerization, ultra-fine lotion polymerization. In recent years, domestic enterprises and universities have also begun to layout 3-yuan patent inverse lotion polymerization, inverse lotion polymerization, ultra concentrated lotion polymerization, dispersion polymerization and other kinds of (5) the design of various types of Pendant: the design of pendant mainly considers installation, disassembly Register this series of lifting techniques. Lotion polymerization has been widely used, mainly divided into three aspects: first, it is separated into colloidal or powdery solid products after polymerization; second, lotion coatings and adhesives; third, particles are used as the carrier of pigments, particle standards, immune reagents, etc. Among them, lotion coating has become one of the most important components of lotion products

acrylate polymer has become a leader in many polymer lotion products because of its superior film-forming property, good oil and weather resistance, and excellent adhesion. Acrylate lotion system with hard monomer styrene, referred to as styrene acrylic lotion for short, has high weather resistance, color retention, stain resistance, etc., and its cost is lower than that of pure acrylic lotion, so it has become the most general and common lotion variety. Styrene acrylic lotion is mainly used as adhesive. As an adhesive, it has high hardness and good water resistance. In addition, it can also be widely used as exterior wall, interior wall paint, floor polish, colored sand paint, concave convex primer, stone paint, etc. China began to develop styrene acrylic lotion system from the 1970s, and officially put into use in the 1980s. With the development of core-shell technology, interpenetrating polymer complex and soap free lotion polymerization, a series of achievements have been made in the research of styrene acrylic lotion

environment and health is one of the most important themes of mankind in the 21st century. In order to create a clean and comfortable living environment and a sustainable economic environment, various countries have gradually tightened the control of pollution. Solvent based coatings are liable to pollute the air due to the inevitable volatility of solvents, which increasingly restricts their application, resulting in significant changes in the variety structure in the field of coatings. While water-based coatings are pollution-free, and the production process and equipment are similar to traditional solvent-based coatings.

in addition, water-based coatings also have the advantages of electrophoretic coating and reactivity, so they have become the coatings with the fastest annual growth rate in developed countries

the key technology of replacing solvent based coatings with lotion coatings is the challenge of film hardness and weather resistance, which is difficult to achieve for ordinary lotion products. Scientific and technological workers in this field have conducted more in-depth and extensive research and made breakthroughs. Among them, the representative systems are room temperature crosslinking curing lotion system, double crosslinking core-shell structure lotion system and nano particle/polymer composite lotion system

The development of room temperature crosslinking technology brings new vitality to the development of lotion coatings. Compared with the crosslinking reaction at higher temperature, the room temperature crosslinked lotion system has obvious advantages. The film-forming material not only has a stable cross-linking structure, but also has good water resistance, acid and alkali resistance, pollution resistance and excellent mechanical properties. Moreover, it does not need heating in construction, saves energy, and greatly expands its application range. The disadvantage is that the price of functional monomers is expensive, and its cost is higher than that of ordinary lotion coatings. Therefore, the research of organosilicon modified acrylate polymers has become a hot spot. Organosilicon is a synthetic polymer material mainly composed of silicon atoms and oxygen atoms. It has both organic and inorganic properties, and has excellent high and low temperature resistance, ultraviolet and infrared radiation resistance, oxidative degradation resistance, electrical insulation and elasticity. They can be low or high viscosity liquids, or solid resins or rubbers. With the continuous research, development and improvement of new coatings, organosilicon has been widely used and developed as weather resistant coatings, heat-resistant coatings, heat-resistant electrical insulation coatings, water-based coatings, isolation coatings and as coating additives. There are two methods of modification: physical blending and chemical reaction. The chemical modified product is better than the pure physical blending. Chemical modification is mainly to introduce active functional groups on the end or side groups of Silicone Flexible siloxane chain, and combine with other polymers to form block, graft or interpenetrating copolymers. The double cross-linked core-shell structure lotion system is a new type of core-shell structure product with core-shell micro cross-linking and shell cross-linking at room temperature. By adjusting the degree of core body micro crosslinking and the proportion of core-shell size, the composition and structural characteristics can be changed to further improve the product performance, especially the film hardness. It has laid a more solid and extensive theoretical and application foundation for developing a series of lotion coating products with excellent performance

nano polymer composites are a new field of polymer materials science that has developed very rapidly in recent years. They are one of the important technologies to obtain high-performance composites. Nano particle/polymer composite lotion system is also a hot research field of new lotion system. This new composite lotion system can perfectly combine the rigidity, dimensional stability and thermal stability of inorganic materials with the toughness of polymer materials, lay a theoretical and application foundation for the preparation of various functional new coating products such as flame retardant, weather resistance, radiation protection, etc., and open up a new era of composite lotion products. The technical difficulty of nano particle/polymer composite lotion system is how to ensure that inorganic particles are dispersed in polymer in nano size. Currently Na 3 The preparation method of long-life rice particle/polymer composite lotion system mainly uses the existing nano powder as raw material, and the real nano particle monodispersion has not been achieved

Tsinghua University adopts a new process and idea, that is, chemical modification of the surface of inorganic particles in the preparation process. Based on the idea of molecular design, inorganic nanoparticles, surface chemical modifiers and polymerized monomers are organically combined in the preparation process, from the preparation of inorganic dispersed particles to the surface chemical modification of nanoparticles to in-situ polymerization to form composite materials, The preparation of inorganic nano dispersed particles really needed for polymer composites can effectively avoid the problems existing in the collection and storage of nanoparticles at too high temperature. During the preparation of nanoparticles, the surface activity of fresh particles is increased by controlling the reaction conditions, which is conducive to the surface chemical modification, and lays a material foundation for the effective combination between nanoparticles and organic phase. Preliminary results have been achieved in this research, and a stable nano magnesium hydroxide/styrene acrylic polymer lotion has been successfully synthesized. Compounded with a small amount of nano magnesium hydroxide, on the basis of keeping other properties basically unchanged, the calcium ion stability and film hardness of the coating are greatly improved, which lays a foundation for improving the performance of lotion products and expanding their application fields. Water emulsion coating with excellent performance is an inevitable trend in the field of coatings

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