"Small products, wide application, big stage", Yang Huageng, chairman of Zhejiang Kesida New Materials Co., has his own understanding of the sealant industry. Although the sealant is inconspicuous, it has a wide range of applications in building construction, and plays a vital role in the durability, safety and protection of the building.
For large-scale buildings, especially permanent construction projects, if the quality of the sealing material is not close enough or does not meet the environmental adaptability requirements, it will affect the aesthetics of the building, such as the stains formed by the leakage of rainwater after the sealing material of the bridge prefabricated plate is aged; The impact on the structural strength and safety of the building, such as the improper use of the sealing material of the reservoir dam, the consequences are unimaginable. In Yang Huageng's view, the sealant industry he is engaged in is very meaningful. The ability to develop sealing materials with excellent performance and excellent quality is the driving force for his entrepreneurship and the responsibility of the company to the society.
Explore sealing materials that can compensate for defects in similar products
Adhesive sealing materials used in the construction industry include epoxy resin, polyurethane, polysulfide rubber, silicone and modified silicone sealant. However, due to some defects, it is still not enough to meet the needs of construction projects.
Epoxy resin adhesive has high bonding strength, but it is easy to be brittle in low temperature environment; urethane rubber adhesive has good bonding performance and wear resistance, but its curing process will release toxic and harmful by-products; polysulfide rubber has more Good oil and solvent resistance, but not high strength, not resistant to aging, easy to harden and crack in the outdoor exposure to ultraviolet radiation.
The largest application is silicone sealant, mainly one-component room temperature vulcanized silicone rubber, commonly known as silicone sealant. Silicone sealant can achieve cross-linking vulcanization at room temperature, easy to use, good bonding performance and excellent weathering resistance. However, the existing silicone sealant must absorb the moisture in the air to complete the vulcanization reaction, so it cannot be deep vulcanized. Generally, the depth of the filled silicone rubber is not more than 5 mm. For caulking bonding of fabricated building components, a thin adhesive layer is difficult to achieve the bonding strength and sealing effect required by the building.
Can you find a new research direction, develop a sealant product that meets the structural requirements of the building and adapt to the environment, and become the entrepreneurial driving force of Yang Huageng. In the building materials industry, many entrepreneurs are adhering to the idea of “channels are kings”. From the very beginning, they have put their energy and financial resources into the market, looking for relationships, running projects, and orders are the lifeline of enterprises. However, Yang Huageng put the focus of the company on R&D. The first investment was experimental equipment. He invested several million yuan to build a laboratory, hired old expert Jiang Chengyong and set up a research team with him as the technical leader. Two-component room temperature vulcanized liquid silicone rubber for bonding and sealing is used as a research and development direction.
Any depth vulcanization at room temperature
According to Jiang Chengyong, after two years of research and development, Costar developed a two-component room temperature vulcanized liquid silicone rubber for KSD-28 series adhesive sealing. The new type of sealant maintains the silicone rubber with excellent performances such as high temperature resistance and weathering resistance. The product overcomes the inherent disadvantages of the traditional building sealing silicone rubber which cannot be deeply vulcanized. It can be arbitrarily deep vulcanized and fully vulcanized silicone rubber bonding. Stable performance, its bonded and sealed building components maintain long-lasting water resistance and excellent performance.
In the application, the A/B two-component silicone rubber material is mixed in a ratio of 1:1 (volume ratio). Under the condition of room temperature, the mixed silicone rubber material can be vulcanized into an elastomer at any depth, and the vulcanized silicone rubber is used for concrete. Glass, ceramics, alloy aluminum, steel and other substrates can be reliably bonded without pre-priming treatment. The vulcanized silicone rubber has excellent weathering resistance and can withstand long-term water soaking and remain stable. Bonding effect.
At present, Costar Company has applied for the national patent of “self-adhesive two-component room temperature vulcanized silicone rubber”, and it is in line with the National Synthetic Resin Quality Supervision and Inspection Center, Shanghai Rubber Products Research Institute, and China State Construction Science Research Institute National Construction Engineering Quality Supervision and Inspection Center. The Institute of Structural Materials of China Institute of Water Resources and Hydropower Research, Shanghai Construction Engineering Group Institute of Assembly and Construction, China Railway Science Research Institute Railway Construction Institute jointly drafted the "liquid silicone rubber two-component room temperature vulcanization bonding type" group standard, Standardization work for this product has been opened.
In order to test the construction performance of this product, Costar developed a comprehensive simulation construction project in the plant area last year, including reservoir (simulated reservoir), concrete section (simulated highway) and half-wall channel (simulated culvert and tunnel). The process performance and performance of the new product were verified through the engineering construction process. On the surface of the verification results, KSD-281 type silicone rubber material is poured into the joint of the building, which is easy to fill the joint gap; the mixed silicone rubber material is thixotropic, and the silicone rubber material is still not sag in the gap of the tunnel dome; the mixed silicone rubber material After about half an hour of crusting, it is almost cured in about 2 hours. This simulation project is injected into the river water all the year round. The flowing water is injected into the pond after the joint of the simulated tunnel, so as to verify the reliable adhesive sealing performance and long-term water-resistant immersion bonding performance of the company's self-produced silicone rubber.
Chasing the dream:
Applied in national key projects
This new product from Costar is used in a wide range of applications for adhesive sealing of traffic engineering, hydraulic engineering and fabricated building joints. It can be used for initial bonding of new building component joints for long-term safety. Seal protection, extending the service life of the building, and for the maintenance and repair of the joints of old building components, can make up for some defects of the original composite components, or repair the joint seal of the building materials that failed with other assembly materials.
Because the product can be deep vulcanized, and the vulcanization speed is faster than ordinary silicone sealant, it is suitable for indoor and outdoor building decoration, such as glass curtain wall assembly, door and window installation and sealing, sanitary ware assembly and waterproof plugging. At the same time, the product can be normally vulcanized into an elastomer in a dry or cold environment. This special process performance not only expands the application range of silicone rubber, but also plays an important role in the fields of national defense industry and engineering rescue.
In the view of Costar, the market is important. After all, enterprise R&D is for market needs, and the market is also the cornerstone of enterprise development. But the pursuit of excellence, reflects corporate value, and fulfills corporate responsibility is the ultimate goal of Costar. Jiang Chengyong said frankly: “If our products can be applied in national key projects, I will feel extremely glorious.” This expression stems from self-confidence. Costar believes that the quality and performance of its products can meet the highest standards, and also Expressing the dream that Costar is chasing, this magical silicone rubber can contribute to the country and society.