Abstract:
PROBLEM TO BE SOLVED: To provide a molded article of melamine/formaldehyde foam, which makes the amount of emitted formaldehyde smaller. SOLUTION: In this molded article composed of the melamine/formaldehyde foam, the amount of formaldehyde emitted from the molded article, which is measured according to the Deutsche Industrie Norm 55666, is smaller than 0.1 ppm. The molded article is obtained by the following treatments: (a) a foam is manufactured from a melamine/formaldehyde pre-condensate wherein a molar ratio between melamine and formaldehyde is higher than 0.5; (b) the foam, which is formed by the treatment (a), is annealed at a temperature lower than 200; and (c) the annealed foam is molded in a compressor for 15-120 seconds at a temperature of 160-240°C under an absolute pressure of 5-100 bars, so that the molded article can be obtained. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
The invention relates to a method for producing elastic foamed materials which are based on a melamine/formaldehyde condensation product. According to the inventive method, a pre-condensate, having a mol ratio of melamine to formaldehyde which is greater than 1: 2, is foamed. Practically no emission of formaldehyde emanates from the foamed materials. No signal or only a very low signal ranging from 65ppm to 85 ppm occurs in the NMR 13 C/MAS spectrum.
Abstract translation:本发明涉及一种方法,用于生产基于三聚氰胺/甲醛缩合产物的弹性泡沫体,其中,从大于1具有三聚氰胺到的甲醛的摩尔比预缩合:发泡2 该泡沫塑料显示出65〜85 ppm的,没有或仅有非常弱的信号的区域中无甲醛释放量实用C / MAS NMR谱中13发生。
Abstract:
Flame-resistant polyurea foams are produced by reacting organic polyisocyanates with water in the presence of catalysts, assistants, additives and borax as flameproofing agent, expediently in an amount of from 150 to 400 parts by weight per 100 parts by weight of organic polyisocyanate. The polyurea foams filled according to the invention with borax have densities of from 60 to 160 kg/m and are suitable for the insulation of buildings and means of transport.
Abstract:
Laminate comprises (a) foamed or honeycomb core layer, density 30-150 kg/cub m, of temp-resistant thermoplast or thermoset plastics material (A) and (b) at least one top layer of fibre-reinforced, temp-resistant, thermoplast or thermoset plastics material (B), core layer (a) having (c) at least one foamed insert, density 200-1000 kg/cub m, of temp-resistant thermoplast (C). - More specifically layer (a) is 4-40 mm thick, layer (b) is 0.1-1.5 mm thick, and insert (c) has dia 0.5-10 cm. (A), (B), and (C) have heat-dimensional stability temp, DIN 53461 (B), at least 130 deg C. Layer (a) is of foam and (A) and (C) are of same type of thermoplast, partic polyether-sulphone (I), polysulphone (II), polyetherimide, or polyamide. Or layer (a) is honeycomb of phenol resin-impregnated aromatic polyamide.
Abstract:
Shaped article (A) of melamine-formaldehyde foam that has formaldehyde emission below 0.1 ppm, as measured by DIN 556661. Shaped article (A) of melamine-formaldehyde foam that has formaldehyde emission below 0.1 ppm, as measured by DIN 556661, is prepared by: (a) generating a foam from a precondensate having melamine:formaldehyde mole ratio over 0.5; (b) conditioning the foam at below 200[deg]C; and (c) compressing the foam, in a press, at 160-240[deg]C and 5-100 bar (absolute) for 15-120 s. Independent claims are also included for the following: (1) method for preparing (A), as described; and (2) melamine-formaldehyde foam with formaldehyde emission below 0.1 ppm, prepared by steps (a) and (b) above.
Abstract:
Flame-resistant polyurea foams having reducing evolution of smoke and fumes in the event of fire and advantageously having densities of from 5 to 15 kg/m are prepared by reacting organic polyisocyanates with water in the presence of catalysts, assistants, flameproofing additives and smoke-reducing additives. The smoke-reducing additives used are molybdenum compounds, such as, for example, molybdenum oxides, molybdic acid and molybdenum chlorides, metal oxides, such as, for example, copper(II) and/or molybdenum(VI) oxide, and preferably soluble organic metal compounds, such as, for example, copper naphthenate and/or copper oleate, expediently in amounts of from 3 to 30 parts by weight per 100 parts by weight of organic polyisocyanate. The polyurea foams according to the invention are particularly useful for filling cavities in mining.