The development trend of MS sealant in prefabricated construction

With the improvement of the characteristic standard of the prefabricated building sealant, MS glue and other excellent performance of the commodity sales market into a broader future. Prefabricated building selection of professional design scheme, modular design, processing plant manufacturing and installation of construction steps, to prefabricated components into the key, the prefabricated components after patchwork will cause a lot of joints, if the sealant quality is not qualified to cause sealing moisture is not reasonable very easy to become penetration point. Factors such as surface characteristics and plate offset of concrete engineering in prefabricated buildings put forward higher requirements for sealing adhesive bonding characteristics, ductibility, weather resistance and coatability. Traditional engineering silicone structural adhesive has good weather resistance and low modulus, but it is poor in the cohesibility and coatability of concrete components, and the matching degree of prefabricated buildings is not as good as MS adhesive.

MS adhesive (silane modified polyether), due to no formaldehyde, no isocyanate, solvo-free, non-toxic, tasteless, low VOC release and other outstanding environmental characteristics, friendly to the environment and human body; Adapted to the vast majority of building materials, with good construction, bonding, durability and weather resistance, especially with non-pollution and coating property, has a wide range of applications in architectural decoration. Suitable for adhesion of various kitchen hardware, ceramic tile, mirror, decorative painting, wood, concrete, stone and so on.

On August 1, 2018 announced the implementation of the national industry standard "silicon copper and modified materials silicon copper engineering building sealant" (GB/T14683-2017) for the first time separately listed MS glue displacement capacity, modulus, elastic recovery rate and other important practical judgment index value, and clearly modified silicone building sealant is suitable for building unsealing and dry shrinkage displacement joints. According to the data information of China Adhesive and Viscose Tape Industry Research Association, the market share of MS adhesive in Japan's construction sealant sales market exceeds 50%. In 2019, Real Madrid Technology plans to invest in the capital construction of 50,000 tons of MS epoxy resin production capacity (MS adhesive key raw material), which is expected to get rid of the technical monopoly of French Wacke and other overseas companies in the industry.

Environmental protection standards and cost increases accelerate the industry's survival of the fittest, industry toward standards and centralization. The current policy of the sealant industry focuses on the transformation and development of the industry environmental protection, the development and design of new sealant and the use of high-tech industries such as electronic devices, etc., according to the "13th Five-Year" construction plan of the Chinese adhesive and viscose tape industry, to decisively replace a part of the outdated production capacity, hazardous ingredients and Voc discharge does not meet the standards of goods, Limit the new establishment and expansion projects of general adhesive manufacturing equipment such as solvent-based neoprene adhesive, butadiene thermal rubber, polyurethane and acrylic ester, and encourage the development of solvent-free adhesive, water-based adhesive, new hot melt adhesive and other environmental and energy-saving adhesive products. The cost of development and environmental protection of enterprises will increase. Large enterprises have more advantages in financing methods, overall strength of product research and development, and small and medium-sized enterprises with limited production capacity slowly withdraw from the industry.

In addition, 17-18 years DMC (silicone sealant main raw materials), MDI (polyurethane sealant main raw materials) and other raw materials cost increased significantly, but the price of commodities lagging behind reflect, the profit rate of major enterprises decreased significantly, small and medium-sized enterprises risk resistance ability is poor and accelerated withdrawal, further concentration of the industry. According to the China building decoration Design Research Society industry data information, the total number of engineering construction sealant enterprises in recent years has remained at 300-320, the number of companies verified by the research society is in 100.