Manufacturing method of slow rebound foam
I. Introduction
Slow rebound foam, also known as memory foam, is a kind of foam material with excellent pressure dispersion properties and high rebound performance. In the field of raw materials for chemical production, slow rebound foam is widely used in home, automobile, aerospace, medical and other industries, with high economic value and application prospects. In this paper, the manufacturing method of slow rebound foam will be introduced in detail, including the steps of raw material preparation, foaming process, and post-processing.
II. Preparation of raw materials
1. Polyether polyol: as the main raw material of slow rebound foam, polyether polyol has good low-temperature flexibility and anti-hydrolysis stability. Selecting the appropriate molecular weight and functionality of polyether polyol is crucial to the foam performance.
2. Polyisocyanate: Polyisocyanate is the key component of foam cross-linking reaction, commonly used diphenylmethane diisocyanate (MDI), toluene diisocyanate (TDI) and so on.
3. Catalyst: Catalyst is used to regulate the foaming speed and cross-linking reaction rate, commonly used are tertiary amine and organotin catalysts.
4. Foaming agent: Foaming agent decomposes and releases gas when heated to make the foam expand. Commonly used foaming agents are water, carbon dioxide, hydrocarbons, etc.
5. Foam stabilizer: Foam stabilizer is used to stabilize the foam and prevent the foam from rupturing, commonly used are silicone oil, polyethylene glycol and so on.
3. Foaming process
1. Pre-mixing: Mix raw materials such as polyether polyol, polyisocyanate, catalyst, foaming agent and foam stabilizer together according to a certain proportion to make pre-mixed material.
2. Foaming: Pour the premix into the mold and heat it to the proper temperature so that the foaming agent decomposes and releases gas and the foam starts to expand. At the same time, the polyisocyanate and polyether polyol cross-linking reaction occurs, forming a three-dimensional network structure.
3. Cooking: At a certain temperature and time, the foam is fully cross-linked and cured to achieve the required hardness and elasticity.
Four, post-processing
1. demolding: remove the ripened foam from the mold for subsequent processing.
2. Cutting: Cut the foam into required shapes and sizes according to demand.
3. Packing: Pack the cut foam for transportation and use.
V. Precautions
1. Strictly control the quality and proportion of raw materials to ensure the stable performance of the foam.
2. In the foaming process, control the temperature and time to avoid overcooking or undercooking of the foam.
3. In the post-treatment process, pay attention to the protection of the foam surface to avoid breakage or pollution.
VI.Conclusion
The manufacturing method of slow rebound foam involves the control of several links and process parameters, and only by mastering the appropriate manufacturing method can we produce slow rebound foam with excellent performance. Through the introduction of this paper, it is hoped that the staff engaged in the field of raw materials for the production of chemicals will provide certain reference and help.
