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[Chemical Knowledge]：The production and manufacturing method and process of semi-hard foam.

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Semi-rigid foam is widely used in the field of chemical production raw materials, and its manufacturing method involves many links and processes. This article will introduce the manufacturing method of semi-hard foam in detail, including raw material selection, ratio, mixing, foaming, curing and other steps, as well as precautions and quality control.

1. raw material selection

manufacturing semi-hard foam need to select the appropriate raw materials, including polyols, isocyanates, blowing agents, catalysts and so on. Among them, polyol and isocyanate are the main raw materials of semi-rigid foam, and the foaming agent and catalyst are the key factors that affect the foaming effect and aging speed. When selecting raw materials, it is necessary to take into account the quality requirements of the product, production costs and environmental protection.

the 2. ratio and mixing

to determine the raw materials, it is necessary to mix them together according to a certain ratio. Generally speaking, the ratio of polyol to isocyanate is between 1:1 and 1:3, and the specific ratio needs to be adjusted according to the requirements of the product. During the mixing process, attention should be paid to controlling the temperature, stirring speed and time to ensure that the raw materials are fully mixed and evenly.

3. foaming

uniformly mixed raw materials need to be foamed by a foaming machine. In the foaming process, it is necessary to control the amount of foaming agent and the foaming time to obtain the desired cell structure and density. At the same time, it is also necessary to pay attention to the maintenance and maintenance of the foaming machine to ensure the normal operation of the equipment and the stability of the product.

4. aging
After the
foaming is completed, the semi-hard foam needs to be cured. During the curing process, it is necessary to control the temperature and time to promote the curing and stability of the semi-hard foam. At the same time, it is also necessary to monitor and record the curing process to ensure product quality and traceability.

5. precautions and quality control

In the process of manufacturing semi-hard foam, you need to pay attention to the following matters and quality control points:

1. Quality control of raw materials: ensure the quality of raw materials is stable and reliable, and avoid the use of unqualified Raw materials cause product quality problems.
2. Control of mixing process: ensure the mixing uniformity and proportion accuracy of raw materials, and avoid product quality problems caused by uneven mixing or improper proportion.
3. Foaming process control: control the amount of foaming agent and foaming time, in order to obtain the ideal cell structure and density, to avoid the problem of poor foaming or uneven density.
4. Control of curing process: control the curing temperature and time, promote the curing and stability of semi-hard foam, and avoid problems such as poor curing or excessive curing.
5. Product quality inspection: quality inspection of the produced semi-hard foam, including density, hardness, compression strength and other indicators to ensure that the product quality meets relevant standards and customer requirements.

To sum up, the manufacturing method of semi-hard foam involves multiple links and processes, and the quality and parameters of each step need to be strictly controlled to ensure the quality and stability of the final product. At the same time, it is also necessary to continuously optimize and improve the manufacturing process, improve production efficiency and reduce costs to meet the needs of the market and customers.

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