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Preparation method of polydimethylsiloxane modified phenolic foam

A polydimethylsiloxane and phenolic foam technology, which is applied in the field of preparation of high molecular organic compounds, can solve the problems of not very obvious effect, large amount of modified raw materials, etc., and achieves improved flexibility, improved toughness, and expanded application. field effect

Inactive Publication Date: 2011-01-26
SHANGHAI WINSTAR ENERGY SAVING TECH
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Problems solved by technology

In terms of toughening and modifying phenolic resin, a lot of research work has been done at home and abroad, such as modifying phenolic resin with nonylphenol, cashew nut shell oil, linseed oil, etc., but the effect is not very obvious, and the amount of modified raw materials larger

Method used

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  • Preparation method of polydimethylsiloxane modified phenolic foam
  • Preparation method of polydimethylsiloxane modified phenolic foam

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Embodiment Construction

[0014] The present invention will be further described in conjunction with several embodiments now.

[0015] 1) Synthesis of resin: firstly, phenol, formaldehyde, hydroxyl-terminated polydimethylsiloxane (PDMS) and system solvent are copolymerized under the action of an alkaline catalyst to form a modified resole phenolic resin. The specific formula is shown in Table 1.

[0016] Specifically, heat and melt phenol, 37% formaldehyde aqueous solution, organosilicon modifier PDMS, basic catalyst, and system solvent according to the formula in Table 1. When the temperature is above 50°C (mainly to prevent the precipitation of phenol, the method of temperature control and heating can be used) Control the temperature) slowly into the three-necked flask in turn, stir at high speed for 10 minutes to make the mixture uniform; continue to raise the temperature slowly, and keep the heating rate at 1-2°C / min; when the temperature rises to 80°C, remove the heating device, and after maintain...

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Abstract

The invention discloses a preparation method of polydimethylsiloxane modified phenolic foam, which comprises the steps of: firstly, copolymerizing phenol, formaldehyde, organic silicon modifier PDMS and a system solvent into modified resol in the presence of a basic catalyst according to a formula; and then, mixing the modified resol with a surfactant, a physical foaming agent and an acidic curing agent for foaming to prepare the polydimethylsiloxane modified phenolic foam. The invention obviously improves the flexibility and strength of a foam product and reduces the brittleness of the foam product.

Description

technical field [0001] The invention belongs to the field of preparation of macromolecular organic compounds, and in particular relates to a preparation method of phenolic foam which can improve product toughness. Background technique [0002] In recent years, with the development of construction, aviation, ship and space technology, materials with light weight, fire resistance and low toxicity have been paid more and more attention. Organic foam occupies a large proportion of commonly used heat insulation materials, and phenolic foam has become one of the fastest-growing varieties of foam plastics because of its incomparable advantages over other foam plastics. [0003] Phenolic foam is a kind of foam plastic obtained by foaming phenolic resin. Compared with polystyrene foam, polyvinyl chloride foam, polyurethane foam and other materials that dominated the market in the early stage, it has light weight, high rigidity, good dimensional stability, chemical corrosion resistan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08J9/14C08L61/14C08G8/28
Inventor 邓邦俊庞乾椿
Owner SHANGHAI WINSTAR ENERGY SAVING TECH
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