Self-sinking polyurethane foam plastic as well as preparation method and application thereof

Abstract

The invention discloses self-sinking polyurethane foam plastic and a preparation method thereof. The preparation method comprises the following steps: S1, preparing materials: 50-75 parts of polyether polyol A, 15-25 parts of polyether polyol B, 0.1-0.5 part of a catalyst, 1-3 parts of a foaming agent, 0.5-1.5 parts of a foam stabilizer and 2-8 parts of a hydrophilic material; and S2, equipment preparation: washing equipment for mixing and stirring materials with clean water for later use, and additionally preparing a mold paved with a polyethylene film. According to the self-sinking polyurethane foam plastic as well as the preparation method and the application thereof, the temperature in equipment is gradually increased, and an expansion air bag is heated and expanded to drive a pressing block to approach and contact with an alarm, so that the alarm gives an alarm to remind an operator that the stability in the equipment is too high and the material adding speed needs to be controlled in time; the effect of reminding an operator that the temperature exceeds the standard is achieved, and the aperture ratio and the air permeability of the produced foamed plastic can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of foam plastics, in particular to a spontaneously submersible polyurethane foam plastic and its preparation method and application. Background technique [0002] Spontaneously submersible polyurethane foam is mainly used in sewage treatment, aquarium, exhaust gas filtration, air purification and other industries. Heavy metal ions and other functions, the amount of this type of foam is gradually increasing nowadays, so it is particularly important to produce better quality polyurethane foam that can submerge spontaneously. [0003] The existing foam plastics used for sewage treatment are generally prepared by mixing and foaming polyether polyol with a hydroxyl value of 56 mgKOH / g and polymer polyol with a solid content of 45% and toluene diisocyanate, and then undergoing vacuum blasting treatment. Or vacuum blasting can increase the porosity of the foamed plastics and increase the air permeability. However,...

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Problems solved by technology

[0003] The existing foam plastics used for sewage treatment are generally prepared by mixing and foaming polyether polyol with a hydroxyl value of 56 mgKOH / g and polymer polyol with a solid content of 45% and toluene diisocyanate, and then undergoing vacuum blasting treatment. Or vacuum blasting can increase the porosity of the foamed plastics and increase the air permeability. However, the existing production equipment is relatively rough and the operation is relatively cumbersome. When this type of preparation method is applied, the mixing and stirring of the material, the temperature control of the mixture and the influence of external interference Exclusion and other aspects are very demanding. Due to the immobilization of equipment, the foamed plastics produced will have low porosity and air permeability, which will affect the use of products and production efficiency.

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