Method of preparation of porous membranes and adsorbents
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08J-009/24
C08G-077/56
출원번호
US-0360996
(1982-03-23)
우선권정보
DE-2925969 (1979-06-27)
발명자
/ 주소
Scholze Horst (Wrzburg DEX) Schmidt Helmut (Hchberg DEX) Bttner Harald (Gerbrunn DEX)
출원인 / 주소
Fraunhofer-Gesellschaft (Munich DEX 03)
인용정보
피인용 횟수 :
8인용 특허 :
1
초록▼
Silicic acid heteropolycondensates made from hydrolyzable silicic acid derivatives and substituted silanes, optionally with either or both of one or more functional silanes and non-volatile metal oxides or their precursors are made by a known technique, in which the reaction mixture is hydrolyzed an
Silicic acid heteropolycondensates made from hydrolyzable silicic acid derivatives and substituted silanes, optionally with either or both of one or more functional silanes and non-volatile metal oxides or their precursors are made by a known technique, in which the reaction mixture is hydrolyzed and condensed by the action of water and a condensation catalyst, the latter being employed in an amount up to 3% by weight, based upon the weight of the reaction mixture. Improved heteropolycondensates usable as adsorbents and porous membranes can be made by using greater amounts of catalyst, ranging up to 75% by weight, based upon the weight of the reaction mixture. These improved products are very stable in use and are characterized by a pore structure which includes fine pores and coarse pores, whereby products in the form of membranes can have an asymmetrical structure, if desired.
대표청구항▼
A process for the preparation of a porous heteropolycondensate adsorbent, comprising: (i) forming a reaction mixture comprising: (a) at least one hydrolysable silicic acid derivative of the general formula I: SiR4 (I) wherein each R is selected from the group consisting of hydrogen, halogen, alkoxy
A process for the preparation of a porous heteropolycondensate adsorbent, comprising: (i) forming a reaction mixture comprising: (a) at least one hydrolysable silicic acid derivative of the general formula I: SiR4 (I) wherein each R is selected from the group consisting of hydrogen, halogen, alkoxy and -NR′2, wherein each R′is a hydrogen atom or an alkyl group, with the proviso that not all the R radicals are hydrogen atoms, and (b) at least one substituted silane of the general formula II: SiRnR″(4-n) (II) wherein R is as defined above, each R″is selected from the group consisting of alkyl, alkenyl, aryl and aralkyl and n is an integer from 1 to 3, and (c) optionally at least one functional silane of the general formula III: SiRn(R′″Y)(4-n) (III) wherein R and n have the meanings defined above, each R′″is selected from the group consisting of alkylene, phenylene, alkylphenylene and alkylenephenylene and Y is selected from the group consisting of halogen, amino, anilino, aldehyde, keto, carboxy, hydroxy, mercapto, cyano, hydroxyphenyl, diazo, carboxylic alkyl ester, sulphonic acid (-SO3H) and phosphoric acid (-PO3H2), and/or (d) optionally at least one oxide component selected from the group consisting of non-volatile oxides soluble in the reaction medium and compounds capable of forming non-volatile oxides soluble in the reaction medium, the oxide component being an oxide of an element selected from Groups Ia to Va, Group IVb and Group Vb of the Periodic System, the improvement which comprises: (ii) subjecting the reaction mixture of hydrolysis and condensation in the presence of 10% to 75% by weight, based on the weight of the reaction mixture, of a condensation catalyst, with the proviso that when water is the condensation catalyst at least the amount of water stoichiometrically required for hydrolysis is used, optionally in the presence of a solvent, wherein the amounts of the components (a) to (d) are selected so that the resultant silicic acid heteropolycondensate, calculated as oxide units, contains, by weight, 35% to 90% of component (a), 10% to 50% of component (b), 0% to 15% of component (c) and 0% to 40% of component (d) and (iii) removing said water or solvent and drying the obtained polycondensate thereby obtaining a porous adsorbent having two definite different pore sizes including a smaller pore size in the nanometer range and a larger pore size in the micrometer range.
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이 특허에 인용된 특허 (1)
Scholze Horst (Wrzburg DEX) Schmidt Helmut (Hchberg DEX), Process for the production of silicic acid heteropolycondensates useful as membranes and adsorbents.
Schmidt Helmut (Hchberg DEX) Kaiser Alfred (Kist DEX) Scholze Horst (Wrzburg DEX), Membranes based on silicic acid heteropolycondensates and a process for their production.
Popall Michael (Wurzburg DEX) Schulz Jochen (Veitshochheim DEX) Olsowski Birke (Veitshochheim DEX) Pilz Monika (Kleinrinderfeld DEX), Silicon and zirconium based lacquer, its use as a substrate coating and substrates thus obtained.
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