KR970061780A

KR970061780A - Manufacturing method of silica sol

Info

Publication number: KR970061780A
Application number: KR1019960003249A
Authority: KR
Inventors: 안건영; 웨이 데 시
Original assignee: 김창식; 오공산업 주식회사; 웨이 데 시; 천진시 넘버원 케미칼 리전트 팩토리
Priority date: 1996-02-10
Filing date: 1996-02-10
Publication date: 1997-09-12
Also published as: KR0153136B1

Abstract

본 발명은 실리카졸의 제조방법에 관한 것으로, 상세하게는 규산염을 양이온 수지로 교환하여 산성 실리카졸을 얻고, 착화합물 처리 공정 후 미량의 금속이온을 양, 음이온 교환으로 제거하고, 상압, 끓는 상태의 안정화된 K⁺상태하에서 입자성장을 시킨 후, 암모니아 상 양이온 수지를 이용하여 K⁺를 제거하고, 박막 농축 및 한외 여과막 체처리를 통해 고순도, 고농도, 고균일도의 대립(大粒) 실리카졸을 제조하는 방법에 관한 것으로, 본 발명에서는 암모니아상 양이온 수지를 사용하여 K+를 교환하여 즉시 고순도의 암모니아로 안정화된 졸을 얻을 수 있어 본 발명의 제조 방법은 실리카졸을 공업적으로 제조하는데 있어서 진보되고 효과적인 방법인 것이다.More particularly, the present invention relates to a process for producing a silica sol, which comprises the steps of: exchanging a silicate with a cationic resin to obtain an acidic silica sol; removing a trace amount of metal ions by a positive and anion exchange; After growing the particles under a stabilized K ⁺ state, K ⁺ was removed by using an ammonia-based cationic resin, and high-purity, high-concentration, and high-uniformity large-size silica sols were prepared by thin-film concentration and ultrafiltration membrane treatment In the present invention, it is possible to obtain a sol which is stabilized with ammonia at a high purity immediately by exchanging K + by using an ammonia-based cationic resin. Thus, the production method of the present invention is an advanced and effective method for industrially producing silica sol .

Description

Manufacturing method of silica sol

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is a trivial issue, I did not include the contents of the text.

Claims

Diluting commercial sodium silicate with pure water to prepare sodium silicate with a concentration of 4 to 8% (based on SiO ₂ ); A cation exchange step of passing a strong acid cation exchange resin through the sodium silicate solution to obtain an acidic silica sol; An oxalic acid and inorganic acid treatment step in which the silica sol is aged by adding 0.1 to 0.5% of oxalic acid (based on SiO ₂ ) and 0.25 to 1% of inorganic acid (based on SiO ₂ ); An anion and a cation exchange process in which the aged solution is passed through an anion exchange resin to make an acidic sol having a low metal content of PH 4 to 5 and then passed directly through a cation exchange resin; An alkali stabilization step in which the hydroxyl value (KOH) is added to the acidic sol produced in the above step while stirring to adjust the pH to 9.0 to 10.0 and then heating until boiling; The anion and the acidic sol generated in the cation exchange process are added to the alkali solution produced in the above step at a constant rate for 8 to 12 hours to obtain an alkali silica sol having a particle size of 15 to 25 nm and then the alkali solution is boiled again , An acidic sol produced in an anion and a cation exchange process is added at a constant rate for 20 to 40 hours while stirring to obtain an alkali silica sol having a particle size of 35 to 70 nm; An ammonia phase cation exchange process in which an alkali sol produced in the above process is passed through a cationic resin in an ammonia phase to obtain a high purity silica sol stabilized with ammonia; A thin film thickening step of obtaining an alkali sol having a concentration of 30 to 50% (based on SiO ₂ ) by concentrating the thin film of the solution produced in the above step; And an ultrafiltration membrane body treatment step of passing the solution collected in the above step through a fine porous filtration membrane having a particle size of 10 to 100 nm to select particles.

※ Note: It is disclosed by the contents of the first application.