Environment-friendly cardanol, urea synergistically modified phenolic resin and application thereof to high temperature resistant friction material

A friction material and phenolic resin technology, applied in other chemical processes, chemical instruments and methods, etc., can solve the problems of high brittleness, insufficient heat resistance, and susceptibility to oxidation of phenolic resin, and improve heat resistance and toughness. The effect of short time and low process temperature
CN104098751AInactive Publication Date: 2014-10-15谢再锋
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
谢再锋
Publication Date
2014-10-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the technical field of high polymer material, and more specifically relates to a method for preparation of an environment-friendly high temperature resistant friction material from cardanol and urea double-modified phenolic resin. The specific steps are as follows: first, mixing solid paraformaldehyde, cardanol and phenol in the presence of an alkaline catalyst, regulating the pH value to 8.0-9.0, heating to 60-80 DEG C and insulating and reacting for 60-80 min; and then adding modified urea when the temperature drops to 45-50 DEG C, then regulating the pH value to 2-4 in the presence of an acid catalyst, heating to 75 DEG C, insulating for 90 min, and adjusting the pH value to 7 by an alkaline solution; and finally, conducting vacuum dewatering, adding ethanol diluted resin, mixing evenly and discharging. The invention also relates to preparation of a high temperature resistant friction material. A preparation method is characterized by comprising the steps of: mixing 10wt%-20wt% of an adhesive of modified phenolic resin, 5wt%-15wt% of a modifier of rubber, 0.5wt%-5wt% of a curing agent hexamethylenetetramine, 25wt%-35wt% of a fiber reinforced material and 35wt%-45wt% of a filler, and pressing to obtain a finished product; and conducting heat treatment on the finished product to obtain the heat resistant friction material.
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Description

technical field

[0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of cardanol and urea synergistically modified phenolic resin for an environment-friendly high-temperature-resistant friction material and a preparation method of a high-temperature-resistant friction material. Background technique

[0002] Phenolic resin is the first polymer resin to be synthesized and industrialized. Because the product has excellent mechanical properties, heat resistance, cold resistance, electrical insulation, dimensional stability, molding processing type, flame retardancy and low smoke, it is widely used. Used in electrical appliances, machinery, electronics, casting, aviation, aerospace, military, national defense and other fields. However, the weak link in the structure of phenolic resin is that the phenolic hydroxyl group and methylene are easily oxidized, resulting in high brittleness, poor toughness and insuffi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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