Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1978-10-10
1980-03-25
Woodberry, Edward M.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C08L 102
Patent
active
041950194
ABSTRACT:
The compression-moulding composition according to the present invention contains 95 to 98 parts by weight of a product resulting from the treatment of crushed wood with an aqueous solution of phenol and formaldehyde at the boiling temperature of said solution in the presence of hydrochloric acid at a weight ratio between phenol formaldehyde, water, hydrochloric acid and crushed wood equal to 0.15-0.40:0.048-0.27:10-15:0.0724-0.1086:1 respectively, 1 to 3 parts by weight of a curing agent, viz. hexamethylenetetramine, 0.5 to 1 part by weight of a curing accelerator such as calcium oxide or magnesium oxide and 0.5 to 1.0 part by weight of a lubricant such as stearing, oleic acid or stearates. The compression-moulding composition of the present invention has an increased water-resistance (its water-absorption is at most 42-82 mg), a high curing rate (0.57-0.8 min/mm), elevated Martens yield temperature (up to 146.degree. C.) thus making it possible to widen the field of application of the compression-moulding composition. A method for preparing the compression-moulding composition according to the present invention comprises agitation of said components simultaneously with disintegration thereof at a temperature of 97-99.degree.0 C. to the content of volatile compounds of from 6 to 10% by weight. The method is simple in implementation, it has a reduced number of technological steps and lowered power- and labour-consumption in the manufacture of a compression-moulding composition.
REFERENCES:
Chem. Absts. vol. 71:40452w, Polycondensation of Phenol and Formaldehyde, Krasnoselov et al.
Chem. Abst. vol. 71:13739p, Hanenable Phenolic Molding Compositions, Ruetgers-Werke.
Chem Absts. vol. 81:111220p, Purification of Water--Production--Phenolformaldehyde Resins, Krasnoselov et al.
Chem. Absts. 86:173343t, Role--Wood Pulp Modified--P/Foligomer, Popva et al.
Babina Margarita D.
Gabets Anna P.
Pereskokova Ida I.
Popova Galina I.
Nizhnetagilskoe Proizvodstvennoe Obiedinenie "Uralkhimplast"
Uralsky Lesotekhnichesky Institut
Woodberry Edward M.
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