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Common Problems and Solutions for High-elastic Silicone Oil Products

May 11, 2021

1. Coke core (the temperature of the reaction center exceeds the antioxidant temperature of the raw material)
(1) The quality of polyether polyols is problematic: the moisture in the product exceeds the standard during the production, storage and transportation, the content of peroxides and low-boiling impurities is too high, the concentration of metal ions is too high, and the type and concentration of antioxidants are inappropriate;
(2) Formula: In the low-density formula, the TDI index is too high, the ratio of water to the physical foaming agent in the foaming agent is improper, the amount of physical foaming agent is too small, and the water is excessive;
(3) Climate influence: summer temperature is high, heat dissipation is slow, material temperature is high, air humidity is high, and the reaction center temperature exceeds the antioxidant temperature;
(4) Improper storage: When the TDI index increases, the accumulated heat energy during post-curing will increase, causing the internal temperature to rise and coke.

2. Large compression deformation
(1) Polyether polyol: functionality is less than 2.5, the proportion of ethylene oxide is greater than 8%, there are many small molecular components, and the degree of unsaturation is greater than 0.05 mo1/kg;
(2) Process conditions: The temperature of the reaction center is too low or too high, the post-curing is not good, the reaction is not complete, or there is partial coke; (3) Process formula: TDI index is too low, silicone oil stannous octoate is excessive, foam ventilation is low , The closed cell rate is high.

3. The foam is too soft (the hardness decreases under the same density)(1) Polyether polyol: low functionality, low hydroxyl value, high relative molecular mass;(2) Process formula: The amount of stannous octoate is small, the gel reaction speed is slow, and the amount of tin is the same, the amount of water is small, the physical foaming agent is large, the activity of silicone oil is high, the dosage is large, and the TDI index is low.



4. Thick pores
(1) The mixing is not good; the mixing is uneven and the milky white period is short;
(2) Process formula: The amount of silicone oil is lower than the lower limit, the amount of stannous octoate is small, the activity is poor, and the gel speed is slow. 5. Higher than the set density
(3) Polyether polyol: low activity, high relative molecular mass;
(4) Process formula: The amount of silicone oil is lower than the lower limit, the TDI index is low, and the foaming index is low;
(5) Climatic conditions: low temperature and high air pressure.

6. Collapsing bubble holes (gas generation speed is greater than gel speed)
(1) Polyether polyol: The acid value is seriously exceeded, there are many impurities, low activity, and the relative molecular weight is large;
(2) Technological formula: the amount of amine is more and the amount of tin is small, and the TDI index is low. When the same amount of tin is used, the TDI index is too high, the gas generation speed is greater than the gel speed, and the skeleton strength is small and collapses or local holes appear.

Cold-cured high resilience soft foam, also known as HR foam, is a new and high-grade polyurethane soft foam variety. On the basis of ordinary soft foam, through the innovation of raw materials and technology, it has more advanced processing performance and more Because of its excellent physical properties, it soon replaced ordinary soft foam as a high-end cushion material in the automotive, furniture industry and other fields, and has been widely used.

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