摘要:
A process for the manufacture of injection molded articles out of material that is capable of being processed in an injection molding process comprising injection fluid material into a hollow space of a mold of a desired form, hardening or reacting the injected material at raised temperatures and subsequently separating the molded article from the mold at the same high tempeature by the aid of inert gas and/or air, pressed between the molded article and the mold, which is regulated by a self readjusting conical valve.
摘要:
In the disintegration of a chromite or chromium-containing residue, wherein the chromium-containing material is disintegrated with an alkaline compound in the presence of oxygen and a diluent at a temperature above about 800.degree. C. and thereafter leached, the improvement which comprises pre-roasting the chromium-containing material prior to addition of the alkaline compound. Pre-roasting can be effected at 400.degree. to 1200.degree. C. with addition of certain amounts of silica dioxide and/or aluminum oxide and such additives, depending on the chromium containing material, if still required, are added--prior to disintegration and leaching--in such a quantity to establish a ratio of SiO.sub.2 : AL.sub.2 O.sub.3 of about 2:1 and further a ratio, calculated on the basis of NaOH as the alkaline compound, of SiO.sub.2 : Na.sub.2 O of about 1:0.5 plus a Cr.sub.2 O.sub.3 : Na.sub.2 O ratio of about 1:2 to 1:4. Residues from previous leaching cycles can be present during disintegration as solid diluents but their contents of SiO.sub.2 and/or Al.sub.2 O.sub.3 are not taken into account in calculating the SiO.sub.2 :AL.sub.2 O.sub.3 ratios. The process gives excellent results even with starting materials relatively high in SiO.sub.2 which are difficult to disintegrate to materials of desirable properties by other methods.
摘要翻译:在铬铁矿或含铬残渣的分解中,其中含铬材料在氧气和稀释剂存在下在高于约800℃的温度下用碱性化合物分解,然后浸出,其改进包括预先 在加入碱性化合物之前,先将含铬材料进行焙烧。 在焙烧之前,可以在400〜1200℃下加入一定量的二氧化硅和/或氧化铝,这些添加剂根据含铬材料的添加,如果仍然需要,则在分解和浸出之前加入 - 以这样的量来确定SiO 2 :Al 2 O 3的比例为约2:1,并且还基于作为碱性化合物的NaOH计算的SiO 2 :Na 2 O的比例为约1:0.5,加上Cr 2 O 3 :Na 2 O的比例 约1:2至1:4。 以前的浸出循环中的残渣可以作为固体稀释剂在分解过程中存在,但是在计算SiO 2 :Al 2 O 3比率时不考虑其SiO 2和/或Al 2 O 3的含量。 该方法即使在SiO 2中起始材料相对较高而难以通过其它方法分解成具有所需性质的材料也能获得优异的结果。
摘要:
Production of tetraethyl ammonium perfluoroalkyl sulphonates (C.sub.2 H.sub.5).sub.4 N.sym.R.sub.F SO.sub.3 .crclbar., wherein R.sub.F represents a perfluorinated alkyl radical with about 4 to 10 carbon atoms, by reacting crude perfluoroalkyl sulphonic acid fluoride, i.e. perfluoroalkyl sulphonic acid fluoride which has not been especially purified, with triethylamine and an ethoxy silane, preferably dimethyl diethoxy silane, methyl triethoxy silane or tetraethoxy silane in an inert solvent at temperatures of about 10.degree. to 60.degree. C., preferably about 20.degree. to 40.degree. C. The process according to the invention is particularly suitable for the production of tetraethyl ammonium perfluorooctane sulphonate.
摘要翻译:制备全氟烷基磺酸四乙基铵(C 2 H 5)4 N(+)RFSO 3( - ),其中RF表示具有约4至10个碳原子的全氟烷基,通过使全氟烷基磺酸氟化物即即未全氟烷基磺酸氟化物 特别是用三乙胺和乙氧基硅烷,优选二甲基二乙氧基硅烷,甲基三乙氧基硅烷或四乙氧基硅烷在惰性溶剂中,在约10℃至60℃,优选约20℃至40℃的温度下纯化。根据 本发明特别适用于生产全氟辛烷磺酸四乙基铵。
摘要:
In the disintegration of at least one chromium source selected from the group consisting of a SiO.sub.2 -containing chromite and a chromium-containing residue with an alkali compound at a temperature above about 800.degree. C in the presence of atmospheric oxygen and a lime-free diluent, followed by leaching of the mixture with at least one of water and/or a chromium (VI)-containing aqueous solution, the improvement which comprises including in the mixture to be disintegrated an aluminum compound and at least sufficient alkali to form alkali chromate and to convert the SiO.sub.2 into an alkali-aluminum silicate corresponding to the formula nMe.sub.2 O . mSiO.sub.2 . Al.sub.2 O.sub.3, wherein Me is at least one of sodium and potassium, 0.8 .ltoreq. n .ltoreq. 1.2 and 1.3 .ltoreq. m .ltoreq. 4.3.
摘要翻译:在大气氧气和无石灰稀释剂的存在下,在高于约800℃的温度下,将至少一种选自含SiO 2的铬铁矿和含铬残渣的铬源分解 ,然后用至少一种含水和/或含铬(VI)的水溶液浸出混合物,其改进包括在混合物中包含铝化合物和至少足够的碱以形成碱式铬酸盐, 将SiO 2转化为对应于式nMe 2 O的碱 - 硅酸铝。 mSiO2。 Al 2 O 3,其中Me是钠和钾中的至少一种,0.8≤n≤1.3且1.3≤3.4。
摘要:
In the etching of glass wherein glass is contacted with an aqueous etching bath containing hydrofluoric acid, and the glass is thereafter removed from the bath and rinsed, the improvement which comprises dissolving in the etching bath an acid-resistant wetting agent. Preferably the wetting agent contains fluorine, e.g. a perfluoralkane sulfonic acid quaternary ammonium salt, a perfluoralkane carboxylic acid salt, an alkoxylation product of a perfluoralkane sulfonamide, or the like.
摘要:
The present invention is concerned with a process for molding thermoplastic, high molecular weight aromatic polycarbonates the improvement which comprises adding to the aromatic polycarbonate from about 0.001 to 1% by weight of a mold release agent selected from the group consisting of perfluoroalkanesulphonic acid amides, cyclimmonium salts of perfluoroalkanesulphonic acids and ammonium salts of perfluoroalkanesulphonic acids.
摘要:
The present invention is concerned with molding compositions which contain an aromatic polycarbonate and from about 0.001 to 1% by weight of a mold release agent selected from the group consisting of perfluoroalkanesulphonic acid amides and cyclimmonium salts of perfluoroalkanesulphonic acids.
摘要:
In the electrodeposition of a chrome layer wherein the chrome is deposited from an electrolyte solution containing a hexavalent chromium compound in the presence of a fluorine-based surfactant, the improvement which comprises employing as the fluorine-based surfactant a quaternary ammonium perfluoralkane sulfonate of the formula[R.sub.F SO.sub.3 ].sup.- [NR.sup.1 R.sup.2 R.sup.3 R.sup.4 ].sup.+in which R.sup.1,R.sup.2, R.sup.3 and R.sup.4 each individually is alkyl, alkenyl, cycloalkyl or aralkyl of up to 18 carbon atoms, or two or three of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 together with the nitrogen atom to which they are attached form a heterocyclic ring, and R.sub.F is a perfluorinated alkyl radical with 6 to 12 carbon atoms.Additives such as Na.sub.2 CO.sub.3, NaHCO.sub.3, Na.sub.2 CrO.sub.4, K.sub.2 CrO.sub.4, Na.sub.2 Cr.sub.2 O.sub.7 and K.sub.2 Cr.sub.2 O.sub.7 or water may also be admixed with the quaternary ammonium perfluoralkane sulfonate.
摘要:
An .omega.-perfluoroalkane sulfonamido-alkane phosphonic or phosphinic acid or salt of the formula ##EQU1## in which R.sub.F is a perfluoroalkyl radical with from 1 to 12 carbon atoms;x and n each independently is 0 or 1,Y is hydrogen or a lower aliphatic radical with up to 5 carbon atoms,Z is an aliphatic radical with up to 5 carbon atoms, a cycloaliphatic, araliphatic or aromatic radical, andR is hydrogen, an alkali metal, alkaline earth metal or ammonium radical.The compounds are useful as surfactants in depressing the surface tension of water.