Raw materials and additivesIsocyanates

Isocyanates and polyols are the two main components of polyurethane foam systems. Since the early 1950s、 China's organic isocyanate industry has relied on its own technological strength to develop toluene diisocyanate (TDI) and polymethylene polyphenyl polyisocyanate (PAPI). Since the 1980s、 China has formed a production pattern of small tonnage isocyanates such as toluene diisocyanate (TDI)、 diphenylmethane diisocyanate (MDI)、 and polymethylene polyphenyl polyisocyanate (PAPI)、 with triphenylmethane triisocyanate (TTI) supplemented by self-developed technology to produce hexamethylene diisocyanate (HDI) [2]   After the 1980s、 the Yantai Synthetic Leather Factory under the former Ministry of Light Industry introduced a 20000 ton MDI/PAPI co production unit. In the mid-1990s、 Yantai Wanhua Polyurethane Co.、 Ltd.、 established on the basis of Yantai Synthetic Leather Factory、 relied on its own strength and underwent several technological reforms. Not only did it rapidly improve production capacity、 but also significantly improved product quality. Currently、 Wanhua Company has built a 160000 ton/year MDI production plant in Ningbo、 Zhejiang、 with world-class competitiveness. China originally introduced 4 sets of TDI devices with a total capacity of 70000 tons/year、 among which only Gansu Yinguang Chemical Company and Cangzhou Dahua Group devices were operating normally、 resulting in a significant gap in TDI domestically. Due to the huge potential of the polyurethane raw material market in China and Southeast Asia、 international multinational corporations have been competing to build factories in China、 such as Huntsman、 BASF、 and Bayer、 which have all built MDI and TDI production plants in Shanghai. In the foreseeable future、 the supply and demand situation of organic polyurethane in China will improve Polyols

Polyols for polyurethane mainly include polyether polyols and polyester polyols、 with the former having a higher yield.

. In recent years、 the production and variety of domestically produced polyethers have greatly improved、 from only producing polyethers with 2 functional groups and a relative molecular weight of 500 to producing polyethers with 8 functional groups and a relative molecular weight of over 6000 in 5 series and hundreds of brands. Many new polyether varieties have been developed、 including high-temperature resistant polyethers、 flame retardant polyethers、 aromatic polyethers、 high solid content styrene、 acrylonitrile grafted polymer polyols、 and so on. With the continuous production of imported devices and the continuous improvement of product quality、 the production capacity of polyether polyols in China has doubled、 and the product quality has reached or exceeded the level of similar foreign products. The low unsaturated polyether polyol synthesized by the bimetallic cyanide complex catalytic system has obtained independent patents. By 2001、 the production capacity of epoxy propane (PO) and polyether polyols (PPG) in large domestic polyether factories had reached 425000 tons and 430000 tons、 respectively Foaming agent

The foaming principle of chemical foaming agent is based on the fact that the isocyanate group in the isocyanate molecular structure can react with various groups such as light groups and amino groups on the foaming agent molecule、 resulting in small molecules of gas (such as CO2) being sealed in the cured system、 forming bubbles.

. The most common chemical foaming agent is water、 which has been widely used due to its low pollution、 low cost、 simple process、 and good foaming effect Physical foaming agents are mainly small molecules with low boiling points、 usually liquid at room temperature. Their foaming principle relies on the heat released during reaction with polyols to raise the temperature of the foaming agent above the boiling point、 forming gas and forming foam pores. Freon foaming agent is an ideal foaming agent for rigid polyurethane foam foam stabilizer

foam stabilizer plays a vital role in the formation、 stability and pore size adjustment of polyurethane foam materials. Among them、 silicone foam stabilizer is the most widely used、 which is mainly synthesized by low hydrogen polysiloxane and allyl terminated polyether under the action of platinum catalyst

Function of testing report:

1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report

inspection and testing process:

1. Telephone communication and confirmation of requirements

Testing and testing characteristics:

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