摘要:
Method of removing odorous formaldehyde from stabilized shaped polyoxymethylenes in which an inert gas is caused to flow over stabilized and shaped solid polyoxymethylenes at elevated temperatures not high enough to cause sticking or fusion of the polyoxymethylene, until substantially all of the volatile formaldehyde has been removed.
摘要:
Thermoplastic molding compositions based on polyoxymethylene and containing, to improve the impact resistance, a block copolymer of a diene polymer block B and at least one poly(alkylmethacrylate) block A.
摘要:
Impact-resistant thermoplastic molding compositions containing from 70 to 98 percent by weight of a polyoxymethylene and from 30 to 2 percent by weight of a block copolymer of the general formula A -- B -- A, wherein A is a polyalkylene oxide block and B is a diene polymer block.
摘要:
A process for producing the magnesium salt of 3-nitro-naphthalene-1,5-disulfonic acid by sulfonating naphthalene, nitrating the sulfonation product, and separating the pure magnesium salt of 3-nitronaphthalene-1,5-disulfonic acid, which process comprises:(a) sulfonating naphthalene with liquid SO.sub.3 in the presence of an inert organic solvent at temperatures between -40.degree. and +20.degree. C.;(b) adding to the reaction mixture obtained a mixture consisting of about equal parts of 100% sulfuric acid and fully reacted crude nitration mixture from nitration of a previous nitration charge, separating from the resulting two-phase system the upper organic solvent phase by decanting, and removing from the Armstrong's acid anhydride acid slurry the remainder of organic solvent by distillation, or removing it during or after subsequent nitration, subsequently adding to the residue the amount of nitric acid required for nitration, and then nitrating;(c) adding then firstly water and afterwards, in the absence of the inert organic solvent, at 90.degree. to 120.degree. C., a compound releasing magnesium ions, the amount being such that, per mol of 3-nitronaphthalene-1,5-disulfonic acid, 1.1 to 1.3 mols of magnesium ions are added, and a sulfuric acid concentration of between 40 and 60 percent by weight (relative to the sulfuric acid and water) is maintained; and(d) separating the crystallized magnesium salt of 3-nitronaphthalene-1,5-disulfonic acid at a temperature of between 20.degree. and 70.degree. C., and subsequently optionally washing it with a maximum of 60 percent by weight of sulfuric acid and/or water, and optionally drying the product.
摘要:
A process for sizing staple fiber yarns by applying an aqueous sizing liquor which contains an alkaline earth metal salt of a copolymer containing from 90 to 30% by weight of acrylic acid and/or methacrylic acid and from 10 to 70% by weight of acrylonitrile and/or methacrylonitrile, which copolymer has a viscosity of from 50 to 1,000 cp in 15% strength aqueous solution at 85.degree. C., and drying the treated yarns. The sized films obtained are moisture-insensitive and have good heat stability.
摘要:
Fabrics of which the warp is sized with water-soluble polymers of acrylic acid and/or their alkali metal salts or ammonium salts, are desized by treating the sized fabric with from 30 to 300 percent by weight of water, based on the dry weight of the fabric, and separating the resulting size solution from the fabric. The recovered size solution can be directly re-used for sizing.
摘要:
Textile materials are pretreated in aqueous media by alkaline scouring and/or bleaching using an assistant comprising a compound of the general formula I ##STR1## where R is C.sub.6 -C.sub.10 -alkyl, X is H, Na, K or NR.sup.1 R.sup.2 R.sup.3 R.sup.4, and R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each H, C.sub.1 -C.sub.4 -alkyl or --CH.sub.2 --CH.sub.2 --OH.
摘要翻译:纺织材料通过碱性洗涤和/或漂白使用包含通式I的化合物的助剂在水性介质中进行预处理,其中R是C 6 -C 10 - 烷基,X是H,Na,K或NR 1 R 2 R 3 R 4,R 1 ,R 2,R 3和R 4各自为H,C 1 -C 4烷基或-CH 2 -CH 2 -OH。
摘要:
A method of processing regenerated liquors of polyacrylate, polyvinyl alcohol and carboxymethylcellulose (CMC) sizes for reuse, wherein the impurities are substantially removed, without noticeably changing the properties of the size, by constantly aerating the liquor and separating off the precipitate thereby formed.
摘要:
The invention relates to a method for treating waste water from carwashes in a mechanical and a biological treatment step, the waste water after running through a silt chamber (2) being collected in a reservoir (3), then passed via an aerosol filter (7) into a bioreactor (8) where it is collected for reuse after biological clarification in a clean-water tank (11), and to a plant for carrying out in particular this method.
摘要:
An improvement in a process for the preparation of a sulphonic acid chloride of the formula ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are independently hydrogen, a lower alkyl radical or a cycloalkyl radical, halogen, aryl, aralkyl, aryl ether or a radical --SO.sub.2 Cl, --SO.sub.2 -aryl ##STR2## or wherein adjacent radicals R.sup.1 and R.sup.2 are linked to form a cycloaliphatic, aromatic or hetero-aromatic ring which is optionally substituted by a sulphonic acid chloride group wherein an aromatic compound of the formula ##STR3## wherein R.sup.1, R.sup.2 and R.sup.3 have the above-identified meanings is reacted initially with chlorosulphonic acid and thereafter the reaction product is reacted with phosgene in the presence of a catalyst.