| 摘要 |
1423925 Non-woven fabrics I C I UNITED STATES Inc 2 July 1974 [12 July 1973] 29287/74 Heading D1R A styrene insoluble fibrous mat is formed from fibres and 3 to 8% based on the total weight of the mat of a binder resin comprising (i) a first alpha-beta ethylenically unsaturated monomer selected from styrene, vinyl acetate, vinyl butyrate, vinyl 2-ethyl hexoate, vinyl propionate, vinyl stearate, vinyl chloride, C 1 to C 4 alkyl methacrylates, acrylates; itaconates, maleates and fumarates; and (ii) a second alpha-beta ethylenically unsaturated monomer selected from acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, acrylamide, C 1 to C 4 alkyl acrylamides, N-alkoxy modified acrylamides, diacetone acrylamide, maleamic acid, fumaride, N-monoalkyl/aryl substituted amides, hydroxyethyl acrylate and hydroxypropyl methacrylate; and (iii) a modifier selected from epoxy resins, melamine formaldehyde resins and urea formaldehyde resins. The impregnated mat is heated to at least 150‹C to cure the resin, preferably it is heated to 175‹C to 225‹C for 33 seconds to 18 minutes. The fibres are glass, cellulose, silk, wool, cotton polyamide or polyester. The resin is introduced during the formation of the mat or by spraying the formed mat with an aqueous dispersion or by drawing it through a chamber in which a suspension of powdered resin is maintained by turbulent air flow. A laminate may be prepared by spraying 4 successive layers of 2 inch chopped glass fibres. Preferably the resin comprises 75-98% by weight of (i), 1-10% by weight of (ii) and 1-15% by weight of (iii). A surfactant may be employed e.g. sodium dodecyl diphenyl ether disulphonate, nonyl phenoxypoly (ethylenoxy 15) ethanol, sodium N-methyl-N-oleoyllaurate, the bis (tridecyl) ester of sodium sulphosuccinic acid, sodium lauryl sulphate and sodium dodecyl benzene sulphonate. Partially hydrolyzed polyvinyl acetate or trisodium phosphate may be used as a suspension agent and hydrogen peroxide, a persulphated, perborate peroxide or a hydroperoxide is used as polymerisation initiator. The curing of the binder may be catalysed by 0.5 to 1% of diethanolamine, dimethylethanolamine, di-n-propyl amine, ethylene diamine, hexane diamine, isophorone diamine, triethanol amine, tetraethylene pentamine, trimethyl hexane diamine, zinc bis (dimethylethanol-amine) acetate, an acid of pK greater than 4, or by a latent catalyst e.g. the morpholine salt of p-toluene sulphonic acid. Styrene insoluble mats are defined as those which support a 100 gm weight from a 4 x 5 inch sample when the sample is immersed in styrene for at least 10 minutes. |
