PURPOSE:To enable the production of a slurry in a good working environment free from scattering of dust, by putting powdery phenolic resin in a paper bag made of regenerated paper, etc., and mixing the resin with a large amount of water together with refractory granules and a fibrous substrate. CONSTITUTION:Powdery phenolic resin is put into a paper bag made of paper selected from regenerated waste paper, old newspaper and packaging paper having a basis weight of 35-70g/m . The resin is added and dispersed to a large amount of water together with refractory granules, organic or inorganic fibrous substrate and, if necessary, various additives. The basis weight of the paper is preferably 45-65g/m . The paper bag is wetted and disintegrated in the mixing tank to form a slurry.

Production of slurry containing phenolic resin for heat-insulation material

PURPOSE:To obtain the titled cheap and nonharmful filler, having flame-retarding properties and providing a molded item of small specific gravity, by mixing boron compounds with fiber at a specific blending ratio. CONSTITUTION:5-250pts.wt. Boron compound such as calcium borate, magnesium borate or aluminum borate is added to and mixed with 100pts.wt. fiber obtained by crushing or disintegrating pulp sheets, waste newspapers, etc. or natural fiber such as cotton, hemp, etc., and preferably an adhesive is further added to and mixed with them. Thereafter, the mixture is dried to obtain an intended filler for resins. The boron compounds of bivalent or higher metals are preferable for the above- mentioned use and, among those, boron compounds containing at least one element of calcium, magnesium and aluminum are preferable, and they give resin products having improved electric insulating resistance, bending strength and impact strength, and a reduced molding time as compared with other boron compounds.

Kawaguchi Shiyouji

Papers

Flame-retarding fibrous filler for resin