Polyurethane foam stabilizer and preparation method

Abstract

The invention provides a polyurethane foam stabilizer and a preparation method. The preparation method comprises the following steps of synthesizing of silicone oil with low hydrogen content, synthesizing of unsaturated polyether, synthesizing of isocyanate-terminated unsaturated polyether, and reacting of the silicone oil with low hydrogen content and the isocyanate-terminated unsaturated polyether, so as to obtain the polyurethane foam stabilizer. The preparation method has the advantages that the unsaturated polyether-terminated polyester uses isocyanate as a end-capping reagent, the usage amount is less, the reaction time is short, the waste salt is not produced, the product quality is stable, and the cost is low; the reaction activity is strong, the property is excellent, the problem of existence of terminating in the existing alkyl terminating and unsaturated polyether is solved, and the variety of the existing polyurethane foam stabilizer is enriched by adjusting the type of the isocyanate end-capping reagent.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a polyurethane foam stabilizer and a preparation method. Background technique [0002] Polyurethane foam is a high-performance structural material developed in the 1950s and 1960s. It has the characteristics of porous, low density, and high specific strength. It can be divided into rigid foam, soft foam, and semi-rigid foam according to its mechanical strength. Wait. Due to the wide range of uses of polyurethane foam, the development is very rapid. [0003] Foam stabilizer, also known as foam stabilizer, is one of the key components in the production formula of polyurethane foam. It is a silicone surfactant. During the foaming process of polyurethane soft foam, silicone surfactant can reduce the surface tension of the system. , each component in the emulsified formula system is conducive to the formation of nuclei and bubbles, and the role of stabilizing the foam. And it has a...

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Problems solved by technology

Chinese patents CN1563146A, CN1311264A, CN1311265A report the polyether alkyl end-capping method to adopt alkoxide reaction and end-capping reaction to carry out the one-step method synthesizing simultaneously, and its shortcoming is that by-product water will be produced in the alkoxide reaction process, at this moment Simultaneous capping reactions will increase the occurrence of side reactions. In order to improve the capping efficiency, the amount of alkoxide reagent and capping agent must be increased. On the one hand, this increases the cost of raw materials. As the amount of waste salt in the product increases, it will inevitably increase the difficulty of refining the end-capped product

The unsaturated polyether reacts with the alkoxide reagent first, and then reacts with the end-capping agent to synthesize the alkyl-capped unsaturated polyether after the alkoxide reaction is complete. The advantage is that the consumption of the alkoxide reagent and the end-capping agent can be reduced. , reduce the cost of raw materials, and increase the end-capping rate, but this method also has great shortcomings: first, in order to make the alkoxide reaction complete, the reaction temperature must be increased, the reaction time must be prolonged, and in order to achieve a higher end-capping rate, the reduction of alkoxide reagents is limited, so this method will still produce a large amount of waste salt, must be refined desalination process, corrosion of equipment, waste of energy is unavoidable

[0011] At present, the synthesis of alkyl-terminated unsaturated polyether requires multiple processes such as alkoxide, end-capping, and refining, which makes the production process difficult to control, energy consumption increases, and product quality is unstable.

In addition, the synthesis of alkyl-terminated unsaturated polyether requires a large amount of alkaline alkoxide reagents and haloalkane-capping agents, resulting in a large amount of waste salt, and the process of refining and desalting must be increased, which not only increases the cost, but also corrodes equipment, Problems such as energy waste and environmental pollution are very serious, and the yield is relatively low

[0012] At present, there is a kind of ester-terminated unsaturated polyether in the unsaturated capped polyether, such as acetyl-terminated unsaturated polyether. Although there is no waste salt in its synthesis, the capping agent and by-products will corrode the reaction equipment, and the capping Precursor drugs are subject to strict control, and because the acetyl group is unstable and easy to hydrolyze, its application range is limited

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