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RU99103625A - SEDUCED BY SILICON, USED AS A STRENGTHENING MATERIAL FOR ELASTOMERS - Google Patents

SEDUCED BY SILICON, USED AS A STRENGTHENING MATERIAL FOR ELASTOMERS

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Publication number
RU99103625A
RU99103625A RU99103625/12A RU99103625A RU99103625A RU 99103625 A RU99103625 A RU 99103625A RU 99103625/12 A RU99103625/12 A RU 99103625/12A RU 99103625 A RU99103625 A RU 99103625A RU 99103625 A RU99103625 A RU 99103625A
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RU
Russia
Prior art keywords
silica
paragraphs
less
silicate
acidifying agent
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RU99103625/12A
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Russian (ru)
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RU2170212C2 (en
Inventor
Ивонник ШЕВАЛЛЬЕ
Филипп КОШЕ
Патрик ФУРР
Original Assignee
Родиа Шими
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Publication date
Priority claimed from FR9706369A external-priority patent/FR2763581B1/en
Application filed by Родиа Шими filed Critical Родиа Шими
Publication of RU99103625A publication Critical patent/RU99103625A/en
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Publication of RU2170212C2 publication Critical patent/RU2170212C2/en

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Claims (1)

1. Способ получения осажденного кремнезема, включающий реакцию силиката с подкисляющим агентом с образованием суспензии осажденного кремнезема, отделение и сушку этой суспензии, отличающийся тем, что осаждение осуществляется следующим образом:
а) готовят исходную шихту, содержащую по меньшей мере часть общего количества предназначенного для реакции силиката и по меньшей мере один электролит, где концентрация силиката (в расчете на SiO2) составляет 50 - 60 г/л,
б) добавляют к шихте подкисляющий агент до достижения значения pH реакционной среды от 7 до 8,5,
в) добавляют к реакционной среде подкисляющий агент и, в случае необходимости, одновременно добавляют оставшееся количество силиката,
г) отделяют путем фильтрации и промывки с использованием фильтра, имеющего приспособление для прессования,
д) сушат путем распыления суспензии, в которой содержится менее 17% по массе сухого материала.1. The method of obtaining precipitated silica, including the reaction of silicate with an acidifying agent with the formation of a suspension of precipitated silica, separation and drying of this suspension, characterized in that the deposition is carried out as follows:
a) prepare an initial mixture containing at least part of the total amount of silicate intended for the reaction and at least one electrolyte, where the concentration of silicate (based on SiO 2 ) is 50-60 g / l,
b) an acidifying agent is added to the mixture until the pH of the reaction medium is between 7 and 8.5,
c) an acidifying agent is added to the reaction medium and, if necessary, the remaining amount of silicate is simultaneously added,
g) is separated by filtration and washing using a filter having a device for pressing,
d) dried by spraying a suspension, which contains less than 17% by weight of dry material. 2. Способ по п. 1, отличающийся тем, что названная выше концентрация силиката (в расчете на SiO2) составляет 55 - 60 г/л.2. The method according to p. 1, characterized in that the above-mentioned concentration of silicate (based on SiO 2 ) is 55 - 60 g / l. 3. Способ по п. 1 или 2, отличающийся тем, что упомянутым выше электролитом является сульфат натрия, концентрация которого в исходной шихте составляет 12 - 20 г/л, преимущественно 15 - 20 г/л. 3. The method according to p. 1 or 2, characterized in that the above-mentioned electrolyte is sodium sulfate, the concentration of which in the original mixture is 12-20 g / l, mostly 15-20 g / l. 4. Способ по любому из пп. 1 - 3, отличающийся тем, что после одновременного добавления подкисляющего агента и оставшейся части силиката, к реакционной среде добавляют дополнительное количество подкисляющего агента, преимущественно до достижения значения pH реакционной среды от 4 до 6. 4. Method according to any one of claims. 1 to 3, characterized in that after the simultaneous addition of the acidifying agent and the remainder of the silicate, an additional amount of the acidifying agent is added to the reaction medium, preferably before the pH of the reaction medium is reached from 4 to 6. 5. Способ по любому из пп. 1 - 3, отличающийся тем, что все предназначенное для реакции количество силиката вводят на стадии "а", а на стадии "в" добавляют подкисляющий агент до достижения значения pH реакционной среды от 4 до 6. 5. A method according to any one of claims. 1 to 3, characterized in that everything intended for the reaction of the amount of silicate is injected at the stage "a", and at the stage "in" add acidifying agent to achieve the pH of the reaction medium from 4 to 6. 6. Способ по любому из пп. 1 - 5, отличающийся тем, что сушке распылением подвергают суспензию, содержащую 14,5 - 16,5 мас.% сухого материала. 6. A method according to any one of claims. 1 to 5, characterized in that the spray drying is subjected to a suspension containing 14.5 to 16.5 wt.% Dry material. 7. Способ по любому из пп. 1 - 6, отличающийся тем, что названную выше сушку осуществляют при помощи форсуночного распылителя. 7. A method according to any one of claims. 1 - 6, characterized in that the above-mentioned drying is carried out using a nozzle spray. 8. Способ по любому из пп. 1 - 7, отличающийся тем, что отделение состоит из фильтрации, промывки и прессования на пресс-фильтре. 8. A method according to any one of claims. 1 - 7, characterized in that the separation consists of filtration, washing and pressing on the press filter. 9. Способ по п. 8, отличающийся тем, что названное выше прессование производится путем введения воздуха под давлением ниже 4,5 бар в течение 20-40 сек, например, в течение 30 сек. 9. The method according to p. 8, characterized in that the above-mentioned pressing is performed by introducing air under pressure below 4.5 bar for 20-40 seconds, for example, for 30 seconds. 10. Способ по п. 9, отличающийся тем, что названное выше прессование производится под давлением 3,8 - 4,3 бар. 10. The method according to p. 9, characterized in that the above-mentioned pressing is carried out under a pressure of 3.8 - 4.3 bar. 11. Способ по любому из пп. 1 - 10, отличающийся тем, что высушенный продукт размалывают, а затем, при необходимости, подвергают агломерации. 11. A method according to any one of claims. 1 - 10, characterized in that the dried product is ground, and then, if necessary, subjected to agglomeration. 12. Способ по любому из пп. 1 - 10, отличающийся тем, что высушенный продукт подвергают агломерации. 12. A method according to any one of claims. 1 - 10, characterized in that the dried product is subjected to agglomeration. 13. Кремнезем, характеризующийся тем, что он имеет удельную поверхность ВЕТ 185 - 250 м2/г, удельную поверхность СТАВ 180 - 240 м2/г такое распределение пор, при котором объем пор V2, образуемый порами с диаметром
Figure 00000001
составляет менее 50% от объема V1, образуемого порами с диаметром, меньшим или равным
Figure 00000002
объем пор (Vd1), образуемый порами с диаметром менее 1 мкм, более 1,65 см3/г, показатель зернистости
Figure 00000003
процентное содержание мелочи (τf) после ультразвуковой дезагломерации по меньшей мере 50%.13. Silica, characterized by the fact that it has a specific surface area of BET of 185–250 m 2 / g, a specific surface of CTAB of 180–240 m 2 / g is a pore distribution in which the pore volume V2 formed by pores with
Figure 00000001
less than 50% of the volume V1 formed by pores with a diameter less than or equal to
Figure 00000002
pore volume (V d1 ) formed by pores with a diameter of less than 1 micron, more than 1.65 cm 3 / g, grit index
Figure 00000003
the percentage of fines (τ f ) after ultrasonic deagglomeration at least 50%. 14. Кремнезем по п. 13, отличающийся тем, что он имеет такое распределение пор, чтобы отношение V2/V1 превышало 0,45. 14. Silica under item 13, characterized in that it has a pore distribution such that the ratio V2 / V1 exceeds 0.45. 15. Кремнезем по п. 13 или 14, отличающийся тем, что объем пор (Vd1), образованный порами с диаметром менее 1 мкм, составляет менее 1,70 см3/г, преимущественно 1,70 - 1,80 см3/г.15. Silica under item 13 or 14, characterized in that the pore volume (V d1 ) formed by pores with a diameter of less than 1 micron is less than 1.70 cm 3 / g, mostly 1.70 - 1.80 cm 3 / year 16. Кремнезем по любому из пп. 13 - 15, отличающийся тем, что его показатель зернистости (I.F.) составляет
Figure 00000004

17. Кремнезем по любому из пп. 13 - 16, отличающийся тем, что его средний диаметр (⌀50) после ультразвуковой дезагломерации составляет величину менее 8,5 мкм, преимущественно 5 - 7 мкм.16. Silica according to any one of paragraphs. 13 - 15, characterized in that its index of grain (IF) is
Figure 00000004

17. Silica according to any one of paragraphs. 13 to 16, characterized in that its average diameter (⌀50) after ultrasonic deagglomeration is less than 8.5 microns, preferably 5 to 7 microns. 18. Кремнезем по любому из пп. 13 - 17, отличающийся тем, что он имеет показатель ультразвуковой дезагломерации (FD) больший 5,5 мл, преимущественно больший 9 мл.18. Silica according to any one of paragraphs. 13 - 17, characterized in that it has an ultrasonic deagglomeration index (F D ) greater than 5.5 ml, mostly greater than 9 ml. 19. Кремнезем по любому из пп. 13 - 18, отличающийся тем, что его объем пор (V3), образованный порами с диаметром между
Figure 00000005
составляет по меньшей мере 0,82 см3/г, обычно не менее 0,85 см3/г.19. Silica according to any one of paragraphs. 13 to 18, characterized in that its pore volume (V3) formed by pores with a diameter between
Figure 00000005
is at least 0.82 cm 3 / g, usually not less than 0.85 cm 3 / g. 20. Кремнезем по любому из пп. 13 - 19, отличающийся тем, что его суммарный объем пор превышает 3,0 см3/г, составляя величину, например, 3,1 - 3,4 см3/г.20. Silica according to any one of paragraphs. 13 - 19, characterized in that its total pore volume exceeds 3.0 cm 3 / g, amounting to, for example, 3.1 - 3.4 cm 3 / g. 21. Кремнезем по любому из пп. 13 - 20, отличающийся тем, что его плотность заполнения в уплотненном состоянии составляет величину более 0,28, обычно не менее 0,30. 21. Silica according to any one of paragraphs. 13 to 20, characterized in that its filling density in the densified state is greater than 0.28, usually not less than 0.30. 22. Кремнезем по любому из пп. 13 - 21, отличающийся тем, что его маслоемкость составляет 230 - 330 мл/100 г, преимущественно 250 - 300 мл/100 г. 22. Silica according to any one of paragraphs. 13 - 21, characterized in that its oil absorption is 230 - 330 ml / 100 g, preferably 250 - 300 ml / 100 g 23. Кремнезем по любому из пп. 13 - 22, отличающийся тем, что его получают в виде существенно сферических шариков со средним размером не менее 80 мкм. 23. Silica according to any one of paragraphs. 13 - 22, characterized in that it is produced in the form of substantially spherical balls with an average size of at least 80 microns. 24. Кремнезем по любому из пп. 13 - 22, отличающийся тем, что его получают в виде порошка со средним размером частиц по меньшей мере 15 мкм. 24. Silica according to any one of paragraphs. 13 to 22, characterized in that it is obtained in the form of a powder with an average particle size of at least 15 μm. 25. Кремнезем по любому из пп. 13 - 22, отличающийся тем, что его получают в виде гранул с размером по меньшей мере 1 мм. 25. Silica according to any one of paragraphs. 13 to 22, characterized in that it is obtained in the form of granules with a size of at least 1 mm. 26. Кремнезем по любому из пп. 13 - 25, отличающийся тем, что он применяется в виде упрочняющего наполнителя для эластомеров. 26. Silica according to any one of paragraphs. 13 to 25, characterized in that it is used as a reinforcing filler for elastomers.
RU99103625/12A 1997-05-26 1998-05-15 Precipitated silica used as reinforced material for elastomers, and method of preparing thereof RU2170212C2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9706369 1997-05-26
FR9706369A FR2763581B1 (en) 1997-05-26 1997-05-26 PRECIPITATED SILICA FOR USE AS A REINFORCING FILLER FOR ELASTOMERS

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