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[Chemical Knowledge]：Manufacturing method and process of slow rebound foam

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The manufacturing method
of slow rebound foam
1. Introduction

slow rebound foam, also known as memory foam, is a kind of foam material with excellent pressure dispersion performance and high resilience performance. In the field of chemical production raw materials, slow rebound foam is widely used in household, automotive, aerospace, medical and other industries, with high economic value and application prospects. This article will introduce the manufacturing method of slow rebound foam in detail, including raw material preparation, foaming process, post-treatment and other steps.

2. Raw material preparation

1. Polyether polyol: As the main raw material of slow rebound foam, polyether polyol has good low temperature flexibility and hydrolytic stability. The selection of the appropriate molecular weight and functionality of the polyether polyol is critical to foam performance.
2. Polyisocyanate: Polyisocyanate is the key component of foam crosslinking reaction, commonly used are diphenyl methane diisocyanate (MDI), toluene diisocyanate (TDI) and so on.
3. catalyst: the catalyst is used to adjust the foaming speed and crosslinking reaction rate, and the commonly used catalysts are tertiary amines and organic tin catalysts.
4. Foaming agent: The foaming agent releases gas during heating to expand the foam. Commonly used foaming agents include water, carbon dioxide, hydrocarbons, etc.
5. foam stabilizer: foam stabilizer is used to stabilize foam and prevent foam rupture. Silicone oil and polyethylene glycol are commonly used.

3. foaming process

1. premixing: polyether polyol, polyisocyanate, catalyst, foaming agent and foam stabilizer and other raw materials are mixed together according to a certain proportion to make a premix.
2. Foaming: Pour the premix into the mold and heat it to an appropriate temperature to decompose the foaming agent and release the gas, and the foam begins to expand. At the same time, polyisocyanate and polyether polyol cross-link reaction, forming a three-dimensional network structure.
3. Curing: at a certain temperature and time, the foam is fully cross-linked and cured to achieve the required hardness and elasticity.

4. post-treatment

1. demoulding: the foam after curing is removed from the mold for subsequent processing.
2. Cutting: Cut the foam into the required shape and size according to the requirements.
3. Packaging: The cut foam is packaged for transportation and use.
Precautions for
5.

1. Strictly control the quality and proportion of raw materials to ensure stable foam performance.
2. In the foaming process, the temperature and time should be controlled to avoid overripe or underripe foam.
3. In the post-processing process, pay attention to protect the surface of the foam to avoid damage or pollution.

6. conclusion The manufacturing method of

slow rebound foam involves the control of many links and process parameters. Only by mastering the appropriate manufacturing method can the slow rebound foam with excellent performance be produced. Through the introduction of this paper, I hope to provide some reference and help for the staff engaged in the field of chemical production raw materials.

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