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[Chemical Knowledge]：Production and manufacturing method and process flow of polyurethane raw materials

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The manufacturing method
of polyurethane raw materials
polyurethane (PU) is a kind of polymer compound, which is produced by the reaction of raw materials such as polyol, polybasic acid and diamine. Polyurethane has excellent properties, such as wear resistance, impact resistance, waterproof, heat insulation, etc., so it is widely used in chemical industry, construction, automobile, furniture and other fields. This article will introduce the manufacturing method of polyurethane raw materials. Manufacturing
of

1. polyol
polyol is one of the important raw materials of polyurethane, and commonly used polyols, polyester polyols, etc. Among them, the polyhydric alcohol is usually produced by an esterification reaction using glycerin, pentaerythritol or the like as a raw material. Esterification reaction is a process in which polyols react with organic acids under the action of acidic catalysts to produce esters and water. Commonly used acidic catalysts include sulfuric acid, phosphoric acid, and the like.

2. polybasic acid manufacturing

polybasic acid is another important raw material of polyurethane, commonly used polybasic acid, aromatic polybasic acid, etc. The polybasic acid is usually produced by alcoholysis reaction using phthalic anhydride, succinic anhydride or the like as a raw material. The alcoholysis reaction is a process in which the anhydride compound reacts with the polyol under the action of a basic catalyst to generate a polybasic acid and an alcohol. Commonly used basic catalysts include sodium hydroxide, potassium hydroxide, and the like.

3. Diamine Manufacturing

diamine is a polyurethane crosslinking agent, commonly used are diethyltoluene diamine, diaminodiphenyl methane, etc. The production method of two amine is more diverse, can be prepared by reduction of nitro compounds, amination reaction and other methods. The synthetic
of

4. polyurethane
mixing raw materials such as polyols, polyacids and diamines in a certain proportion, adding catalysts, foam stabilizers and other additives, through stirring, foaming and other processes, polyurethane foam can be produced. Among them, the function of the catalyst is to adjust the reaction speed, and the function of the foam stabilizer is to prevent the foam from breaking.

5. manufacturing process optimization

In order to improve the performance and production efficiency of polyurethane, it is necessary to optimize the manufacturing process. Commonly used optimization methods include: using highly active raw materials to improve the reaction rate; adding additives such as flame retardants and antioxidants to improve the flame resistance and oxidation resistance of polyurethane; using advanced foaming technology to improve the uniformity and density of foam.

6. environmental protection and sustainable development

With people's attention to environmental protection and sustainable development, the manufacture of polyurethane raw materials also needs to consider environmental protection and sustainability. First of all, it is necessary to choose environmentally friendly and non-toxic raw materials to avoid harmful substances in the production process; secondly, it is necessary to optimize the production process to reduce energy consumption and waste emissions; finally, it is necessary to strengthen the recycling of waste polyurethane materials to achieve effective use of resources.

In short, the manufacturing method of polyurethane raw materials needs to be optimized and adjusted according to specific product requirements and production processes. At the same time, factors such as environmental protection and sustainable development need to be considered to promote the healthy development of the polyurethane industry.

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