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CN1029950C - Silica sol, method for producing silica sol and use of silica sol - Google Patents

Silica sol, method for producing silica sol and use of silica sol Download PDF

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Publication number
CN1029950C
CN1029950C CN 90109033 CN90109033A CN1029950C CN 1029950 C CN1029950 C CN 1029950C CN 90109033 CN90109033 CN 90109033 CN 90109033 A CN90109033 A CN 90109033A CN 1029950 C CN1029950 C CN 1029950C
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colloidal sol
sol
value
ton
scope
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CN1051709A (en
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约翰逊·H·艾里克
拉斯逊·B·伏德玛
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Nouryon Pulp and Performance Chemicals AB
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Eka Nobel AB
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
    • C01B33/157—After-treatment of gels
    • C01B33/159—Coating or hydrophobisation
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/28—Compounds of silicon
    • C09C1/30—Silicic acid
    • C09C1/3045—Treatment with inorganic compounds
    • C09C1/3054—Coating

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Silicon Compounds (AREA)
  • Paper (AREA)

Abstract

A silica sol is described which contains a high proportion of microgels and a high specific surface area particulate sol which has been modified with aluminium, and which can be prepared by a process which comprises acidifying a water glass solution, basifying it at a dry matter content, particle growth and aluminium modification. The sols are particularly suitable as additives in the paper industry in combination with cationic polymers.

Description

Silica sols, process for production of silica sols and use of sols
The present invention relates to new silicon sol, be suitable for producing the method and this new purposes of silicon sol in paper industry of this silicon sol.The invention further relates to and have high-specific surface area and the quite high new silicon sol of its micro gel content is arranged.This new silicon sol is particularly suitable for using in paper industry as additive with cation type polymer.
Silicon sol (referring to the silicon water-sol herein) is the aqueous system that contains very little silica dioxide granule, and it can be used for some Application Areass, and except that other factors, this depends on granular size.In recent years, be that the colloidal sol of base has enlarged application in paper industry to have anionic particulate silicon-dioxide.In addition, silicon sol is with the additive of cation type polymer as paper pulp, and it mainly acts on is to increase retention and dehydrating effect when papermaking.The purposes of the colloidal silica sol that is used in combination with cationic starch in paper industry is for example disclosed in No. the 41056th, European patent.PCT has applied for disclosing for WO86/00100 number and WO86/05826 number silicon sol contains aluminium respectively at least with surface group particle, and natural cation type polymer and cationic-type polyacrylamide combine.Usually, the specific surface area of said silica dioxide granule is at 50-1, in the 000 meters squared per gram scope.Colloidal sol used in the paper industry contains colloidal solid, and its size is generally from about 4 to about 7 nanometers, and promptly specific surface area is from about 700 to about 300 meters squared per gram, and commercial be the long-pending colloidal sol that is about 500 meters squared per gram of first-selected specific grain surface always.Usually think always that the colloidal sol of the colloidal solid that contains above-mentioned intended size has obtained best result, and with regard to stability, this class colloidal sol is considered to ideal.Usually, wish that commercial silicon sol is monodispersity as far as possible, wish that promptly its particle size distribution is narrow as much as possible.So, all note avoiding generating micro gel when producing colloidal sol.
The present invention relates to new silicon sol, it is characterized in that they have lower S-value, and sol particle has high-specific surface area.Have been found that these contain anionic particulate colloidal sol and can be used for obtaining good effect for improving retention and dehydration when they are used in combination with cation type polymer in paper industry and the similar product.The silicon sol that in appending claims, defines, the invention still further relates to as the production of the silicon sol that in appending claims, defines and the purposes of silicon sol.
As mentioned above, silicon sol of the present invention is characterised in that their high-specific surface area, at 750-1, in the 000 meters squared per gram scope.The specific surface area that provides is by " analytical chemistry " 28(1956): 12, the method that Sears write among the 1981-1983 records with the NaOH titration.Specific surface area is better in 750-950 meters squared per gram scope, and is better in 800-950 meters squared per gram scope.Another characteristic of the present invention be with paper industry in known commercially available colloidal sol to compare its S-value lower.The S-value of colloidal sol of the present invention is in the 8-45% scope, and 10-35% is better, and 10-30% is better.The S-value that provides is with " physical chemistry magazine " 60(1956), Iler among the 955-957, R, K and Dalton, R, L, the method measurements and calculations write.We can say that the S-value is a kind of measure unit that aggregate forms degree or micro gel formation degree, so lower S-value representation micro gel content is higher, the S-value also can be used as SiO in disperse phase 2The measure unit of content (in weight percent).The particle surface of colloidal sol of the present invention is 2-25% with the further modification of aluminium to aluminium modification degree, with 3-20% for well.The surface modification degree of aluminium is meant the number of aluminium atom replacement Siliciumatom on particle surface.The modification degree is that benchmark calculates with the percentage ratio surface with 8 silanol groups of every square nanometers.This is at " colloid and interface science magazine " 55(1976): 1,25-34Iler, R, K, article on the books.The S-value of colloidal sol is relevant with particle size distribution to a great extent.Because the formation of aggregate, colloidal sol of the present invention has the particle size distribution of broad.The fact that this point can be described is the SiO in this colloidal sol 210%(weight is arranged) be aggregate greater than 20 nanometers, so usually aggregate is more than 20%(weight).The value of gained records (pillar: Shodex B-806 with gel permeation chromatography (GPC); Eluent: 0.05MNaHCO 3, the pH value transfers to 9.2 with NaOH, consumption: SiO 2Content is 1% colloidal sol 100 microlitres, detects: infrared index is measured).With SiO 2Meter, the dry-matter content of colloidal sol of the present invention with about 3% to about 15%(weight) better, the content of dry substance about 5% to about 12%(weight) scope in better.
The invention still further relates to the method for producing colloidal sol, this method is suitable for producing and has low S-value, wide particle size distribution and the colloidal sol that contains high specific surface area granular.Method of the present invention is particularly suitable for producing the colloidal sol with above-mentioned feature.
The method according to this invention, preparation colloidal sol are from traditional alkaline water glass, and potash water glass or sodium silicate are as starting raw material, from sodium silicate as the starting raw material preparation better.As known in water glass SiO 2With Na 2O or K 2The ratio of O in 1.5: 1 to 4.5: 1 scopes, better (following Na in 2.5: 1 to 3.9: 1 scopes 2O and K 2O is with M 2O represents).What water glass was used is dilution colloidal sol, its SiO 2Content with about 3% to about 12%(weight) for well, from about 5% to about 10%(weight) better, pH value is about 13 or is higher than 13 water glass and will be acidified to pH value from about 1 to about 4 usually.Acidifying can add mineral acid with known method to be carried out, for example available sulfuric acid, and hydrochloric acid and phosphoric acid or time spent are selected other known chemical of acidifying such as ammonium sulfate and the carbonic acid gas that can be used for water glass for use.Adding step mineral acid time-division two carries out acidifying, and it is about 8 to 9 that the first step is acidified to the pH value, then further be acidified to pH value for about 1 to about 4 before, allow its generation maturation to a certain degree promptly allow particle growth.Yet it is better to carry out acidifying with acid cation-exchanger.Except that other advantage, can obtain stable product more and contain the acidic sol of sodium hardly with this exchanger.It is better to carry out acidifying with storng-acid cation exchange resin as (sulfonic acid type).Acidifying proceeds to the pH value from about 2.0 to 4.0 better, and from about 2.2 to about 3.0 is better.Then the acidic sol after the acidifying is made alkalescence.Alkalize available traditional alkali such as sodium hydroxide, potassium hydroxide or ammonium hydroxide carry out.Yet adding water glass alkalizes better.With potash water glass and sodium silicate, particularly sodium silicate (its SiO 2With M 2The mol ratio of o is as indicated above) be used for this alkalinization step.The SiO of the water glass solution that is used for alkalizing 2Content about 3% to about 35%(weight) in the scope better, in 5% to 30%(weight) in the scope better.Alkalization proceeds to the pH value, and to be at least 8 be suitable, is advisable to proceed in 8 to 11 scopes.Preferably further alkalization proceeds to SiO 2With M 2The final mol ratio of O is at about 20: 1 to 75: 1, and is better to about 60: 1 scope at about 30: 1.As method for preparing colloidal sol the time, what of micro gel can be subjected to the influence of several respects, and can be controlled to desirable value.What of micro gel can be subjected to saltiness, the influence of concentration adjustment during the preparation acidic sol and during alkalization, because in these steps, and when pH value be about 5 when qualitative above the minimum steady of colloidal sol, how much just being affected of micro gel.In this process, time expand, can make the desirable value that how much reaches of micro gel.When alkalization with the dry thing content SiO of adjusting 2What of micro gel are the method for content be particularly suitable for controlling, and therefore higher dry thing content obtains lower S-value.In the alkalization process, with SiO 2Content remains on 7-4.5%(weight) can make the S-value be controlled at 8-45%.Be the colloidal sol in the 10-30% scope in order to obtain the S-value, when alkalization with SiO 2Content remains on 6.8-5.5%(weight) in the scope.Acidic sol has the particle greater than the high-specific surface area of 1,000 meters squared per gram, is about 1,300 meters squared per gram usually.After the alkalization, because particle growth, so specific surface area has reduced.Along with particle growth can reach desirable specific surface area, then carry out modification it is settled out after the alkalization with aluminium.Can make surface-area be reduced to desirable value with at room temperature depositing the long period (as one day to about two round the clock) or the method for heating.As method with heating, should regulate time and temperature, use the short time when adopting comparatively high temps so mutually.Although in the very short time, use quite high temperature to be fine, use lesser temps more suitable in fact in a long time.From reality, within a short period of time, to heat-treat under about 50 ℃ temperature condition be suitable not being higher than (being no more than about 2 hours), for example colloidal sol heated about 1 hour under about 35 ℃ of temperature condition.In this way Zhi Bei colloidal sol contains very high specific surface area, at 750-1, in the 000 meters squared per gram scope.In order to make this high-specific surface area stablize and when storing, not reduce, carry out surface modification.The surface-modifying agent that is used for surface-stable is an aluminium properties-correcting agent, uses aluminate sodium aluminate or potassium aluminate to carry out, and is better with sodium aluminate.Carry out the aluminium modification of particle surface with known method, reach 2-25%, particularly reach 3-20% as the foregoing surface modification degree that makes.If colloidal sol contains too many sodium before the aluminium modification, just should remove too many sodium with the method for ion-exchange.If carry out ion-exchange, need before the aluminium modification, the pH value to be transferred to greater than 7, decompose in the modification stage to prevent aluminate.The method according to this invention, after optional the concentrating, can prepare dry thing content and be about 3% to about 15%(weight) silicon sol, the silicon sol that obtains shows good storage stability, promptly storing behind the some months specific surface area does not have substantive reduce and gel-free generates yet.
The new colloidal sol that contains anion particle of the present invention is specially adapted to paper industry.The invention still further relates to this purposes of colloidal sol.As what introduce previously, known being used in combination with silicon-dioxide with cation type polymer in paper industry of people is the colloidal sol of base, and what it was main is to improve retention and dewatering.Silicon sol of the present invention contains the silicon sol of anion particle with the use of knowing already correlation method uses.In paper industry, they are used in combination the significant improvement that has obtained retention and dewatering with cation type polymer.Because the S-value of colloidal sol is low and specific surface area is high, has obtained good retention and dehydrating effect.Except helping sol particle surface stable, both made under acid ph value, aluminium properties-correcting agent also can make it keep high negative charge, and is not so just by the colloidal sol of aluminium modification.This shows in paper industry all can use this colloidal sol in the pH value in the 4-10 four corner, and can obtain good effect.Improved dehydrating effect also means the speed that can increase papermaking machine, the water yield that need remove in the squeezing (Press) of papermaking machine and drying stage has reduced, and obtains a kind of papermaking process that has greatly improved economically thus.What is particularly worth mentioning is that, reaching under the condition of required identical result that compare with commercially available colloidal sol, colloidal sol consumption of the present invention is (with SiO 2Meter) significantly reduces.
The invention still further relates to papermaking process with feature of in claims, writing.This method is a kind of method by the cellulose suspension papermaking that contains fiber, optional filler.Steps of the method are in cationic polymers and the anionic silica sol adding suspension, suspension just is shaped on the net and dewaters.The method is characterized in that to add cationic polymers in suspension, its S-value is for 8-45% and to contain specific surface area be 750-1,000 meters squared per gram and be the colloidal sol of the silica dioxide granule of 2-25% to the modification degree with the aluminium modification.And in cation type polymer of the present invention, those polymkeric substance that are commonly used for retention aid and/or wet strength agent in paper industry all are suitable, they can be natural as with the carbohydrate be base or the synthetic polymkeric substance.The example that cation type polymer is suitable has cationic starch, cationic guar gum, cationic polyacrylamide, polymine, polyamidoamines amine and gathers (diallyldimethylammonium chloride).The cation type polymer use of can using respectively or mutually combine.Cation type polymer has cationic starch and positively charged ion to remove acrylamide preferably.In good especially scheme, silicon sol is used in combination with cationic starch and cation synthesising copolymer, and is good especially when the latter is cationic polyacrylamide.
According to the present invention, the consumption of silicon sol and cation type polymer can change in wide range in the paper, and except that other factors, this depends on paper pulp kind, used filler and other condition.With added SiO in fiber and the optional filler (dry weight) 2Calculate, the amount of colloidal sol should be 0.01 kg/ton at least, and is better, better in 0.1 to 2 kg/ton scope in 0.05 kg/ton to 5 kg/ton scope.Colloidal sol should be put into dry matter content is 0.1～5%(weight) pulp material in.The amount of cationic polymers depends on type of polymer to a great extent and uses desired other effect that reaches of polymkeric substance.For synthetic cationic polymers, with the polymer dry re-computation that adds in fiber and the optional filler (dry weight), need use 0.01 kg/ton at least usually, the 0.01-3 kg/ton is better, and the 0.03-2 kg/ton is better.For cationic polymers such as cationic starch and cationic guar gum,, need use 0.1 kg/ton at least usually with the polymer dry re-computation that adds in fiber and the optional filler (dry weight) based on carbohydrate.For these polymkeric substance, use the 0.5-30 kg/ton better, the 1-15 kg/ton is better.The weight ratio of cationic polymers and colloidal sol is with SiO 2Meter, should be 0.01: 1, at least 0.2 at least usually: 1 is better.The upper limit of determining cationic polymers mainly is an economic cost problem.For the lower polymkeric substance of positively charged ion degree such as cationic starch when being used in combination (separately or with other cationic polymers), available very a large amount of, can reach 100: 1 or higher ratio, its limit depends primarily on economic factors.For most of systems, with SiO 2Meter, cationic polymers was suitable from 0.2: 1 to 100: 1 with the ratio of colloidal sol in the scope.When silicon sol and cationic starch and cation synthesising copolymer (especially removing acrylamide) when being used in combination, silicon sol and the weight ratio of the latter two are better 0.5: 1 to 200: 1 scope in, in 2: 1 to 100: 1 scope better.Silicon sol of the present invention certainly can be in paper industry be used in combination with common chemical product such as hydrophobizing agent, dry strength agent, wet strength agent or the like in the papermaking.Colloidal sol of the present invention and cation type polymer and aluminum compound combined use better, can further improve retention and dewatering because have been found that aluminum compound.Any known aluminum compound that is used for paper industry all can use, for example alum, many aluminum compounds, aluminate, aluminum chloride and aluminum nitrate.The consumption of aluminum compound also can change in wide range, with SiO 2And Al 2O 3Calculate, the weight ratio of aluminum compound and colloidal sol was at least 0.01: 1st, and is suitable.This ratio should not surpass 3: 1, and is better in 0.02: 1 to 1.5: 1 scope.The example of many aluminum compounds can be POLY ALUMINIUM CHLORIDE, many Tai-Ace S 150 and contain chlorine and many aluminum compounds of sulfate ion.Except that chlorion, many aluminum compounds also can contain other negatively charged ion as by sulfuric acid, phosphoric acid, organic acid such as citric acid and oxalic acid deutero-negatively charged ion.
Silicon sol of the present invention and cationic polymers can be used for various fibrous cellulose pulps in paper industry, and in dry-matter, paper pulp should contain 50%(weight at least) such fiber.Each component can be used as the additive of fibre pulp, wherein paper pulp can from chemical pulp such as sulfate pulp and sulfite pulp, preheating mechanical slurry, refiner mechanical are starched or ground wood pulp comprises that hardwood pulp and softwood pulp obtain, and each component also can be used for recycled fibre paper pulp.Paper pulp also can contain mineral filler commonly used such as kaolin, titanium dioxide, gypsum, chalk and talcum.The paper used herein and the notion of paper not only comprise paper certainly, and comprise other sheet or netted each product that contains cellulosic fibre, as paper pulp sheet, pulp board and cardboard and their production method.
Colloidal sol of the present invention can use in paper industry in pH value about 4 to about 10 these very wide scopes.
The interpolation order can be arranged arbitrarily, but it is better to add cationic polymers before adding colloidal sol earlier.If use cationic starch and cation synthesising copolymer simultaneously, also should press this order and add.
The following example further specifies the present invention, but not as limitation of the present invention, and umber and per-cent are respectively umber (weight) and per-cent (weight), other have explanation except.
Embodiment 1A-1L
The preparation method of the following examples explanation colloidal sol of the present invention.In all embodiments, if do not provide out of Memory, used water glass, the SiO of colloidal silica sodium 2With the mol ratio of M20 be about 3.5, Al in the used sodium aluminate solution 2O 3Content is 25%.
Embodiment 1A
To contain 24.2%SiO with 11,560 gram water 23,400 gram water glass be diluted to and contain 5.5%SiO 2With the solution pump pressure of gained by a pillar that is filled with Amberlite IR-120 type cationite.The solution dilution that water exchanged 14,000 gramions is to SiO 2Content is 5.20%, with 1,350 gram SiO 2Content is 5.5% sodium silicate solution alkalization.After alkalizing like this, SiO 2Content is about 5,225%.
38 ℃ of heated solutions 40 minutes, be cooled to room temperature more then.
In order to stablize high-specific surface area, subsequently solution is used the aluminium modification.Modification is undertaken by following method: under agitation add saturated Zeo-karb to the pH value of solution of hydrogen and reduce to approximately 7.5 in 5,000 gram solution, then Zeo-karb is filtered out.Because the product sodium content is lower, these processing have improved the stability of the finished product.Solution is heated to 35 ℃, adds 56.55 gram sodium aluminate solutions then.Aluminium salt diluted with 443.5 gram water before using.
After adding aluminate, the Sol A particulate specific surface area that obtains is about 910 meters squared per gram, and its surface has satisfactory stability.The S-value of this colloidal sol is 32%.Aluminium modification degree is 10%, and the pH value is about 9.5.
Embodiment 1B
In order to make the more corresponding colloidal sol of high alumina modification degree, the aluminium modification sol A for preparing is handled.Under agitation, in 1,000 gram Sol A, add ion exchange resin IR-120 to pH value and reduce to about 7.5.Do like this is that pH value when making the aluminium modification can Yin Taigao and cause infringement stability.
Filter ion exchange resin, solution is heated to 35 ℃, in 45 minutes, add 6.60 gram sodium aluminate solutions then.Aluminate solution dilutes with 58.4 gram water before adding.
The sol B that obtains thus has higher aluminium modification degree than Sol A really, and promptly 15%, but identical in others with Sol A.
Embodiment 1C
With 8,800 gram water dilute Si O 2Content be 24.2% 3,400 the gram sodium silicate solutions to SiO 2Content is 6.74%.
In a pillar this solution being carried out ion-exchange to pH value according to the method for example I A is about 2.5.
The solution that dilute with water 11,000 gramions exchanged is to SiO 2Content is 6.54%, uses 1,100 gram SiO again 2Content is 6.74% sodium silicate solution alkalization.Alkalization back SiO 2Content is about 6.55%.Method heating according to embodiment 1A.
Method according to embodiment 1A is carried out the aluminium modification to 5,000 gram colloidal sols.
The sodium aluminate of Jia Ruing is 69.4 grams in the present embodiment, and before adding, it is with 580.6 gram water dilutions.The colloidal sol C particulate specific surface area that obtains is 894 meters squared per gram, and the S-value is 13%.Aluminium modification degree is 10%.
Embodiment 1D
Reduce with the pH value of mode spent ion exchange resin same among the embodiment 1B 1,000 gram colloidal sol C.
After filtering ion exchange resin, solution is heated to 35 ℃, under agitation adds 7.4 gram sodium aluminate solutions.Aluminate solution second is diluted with 67.6 gram water before adding.The aluminium modification degree that obtains like this is 15%.
Embodiment 1E
The dilute with water sodium silicate solution also carries out ion-exchange in a pillar, make the SiO of colloidal sol 2Content is 5.23%.
In this colloidal sol of 4,000 grams, add 415 gram SiO 2Content is 5.25% sodium silicate solution.
The solution of 40 ℃ of heating alkalization 40 minutes, cooling immediately then.
With the aforementioned same mode aluminium properties-correcting agent surface of stability.Add 23.9 gram aluminate solutions in 2,000 gram colloidal sols, this aluminum salt solution had been diluted with water to 240 grams before adding.The specific surface area of the sol particle that obtains is 863 meters squared per gram, and the S-value is 32%, and aluminium modification degree is 10%.
Embodiment 1F
In mode same among the embodiment 1E sodium silicate solution is carried out ion-exchange and make SiO in the acid-sol 2Content is 6.30%.
In this colloidal sol of 4,000 grams, add 499.7 gram SiO 2Content is 5.25% water glass solution.Alkalization back SiO 2Content is 6.18%.Add thermosol in mode same among the embodiment 1E.
In mode same among the embodiment 1E colloidal sol is carried out the aluminium modification then, method is to add 28.6 gram aluminate solutions in 2,000 gram colloidal sols, and this aluminium salt has been diluted with water to 280 grams.
The particulate specific surface area of the colloidal sol F that obtains is 873 meters squared per gram, and the S-value is 21%, and aluminium modification degree is 10%.
Embodiment 1G
Before the aluminium modification, get 1,000 gram colloidal sol F after the heating.
In the same way colloidal sol is carried out the aluminium modification, but the modification degree is lower.Only add 7.1 gram sodium aluminate solutions in 1,000 gram colloidal sol, this aluminum salt solution is with 62.9 gram water dilutions.The aluminium modification degree of the colloidal sol that obtains is 5%.
Embodiment 1H
To 1,000 restrain colloidal sol F in add ion exchange resin (Amberlite IR-120) to the pH value for about 7.5, elimination ion exchange resin then.
Proceed the aluminium modification.It is 15% that current adding 7.0 grams make the aluminium modification degree of the colloidal sol H that obtains at last with the water-reducible aluminate solution of 63 grams.
Embodiment 1J
With SiO 2With M 2O is diluted to SiO than the water glass solution that is 3.53 2Content is 7.05%, carries out ion-exchange then in pillar.
Add 376.1 gram water and 392.4 gram SiO in 4, the 000 gram acid-sols that in ion-exchange the time, obtain 2Content is 7.05% water glass solution.
The solution of alkalization is accelerated the ripening in ambient temperature overnight.
Mode with the aluminium modification is stablized high surface area.In 2,000 gram colloidal sols, add the 31.4 gram sodium aluminates that diluted with 268.6 gram water.The colloidal sol fourth particulate specific surface area that obtains is 962 meters squared per gram, and the S-value is 12%, and aluminium modification degree is 10%.
Embodiment 1K
In the present embodiment, to alkalizing, heat among the embodiment 1J but not the colloidal sol of aluminium modification does not carry out the aluminium modification to lower aluminium modification degree.Add 15.7 gram sodium aluminate solutions in 2,000 gram colloidal sols, this aluminate diluted with 134.3 gram water.The aluminium modification degree that obtains thus is 5%.
Embodiment 1L
The dilution water glass solution also carries out ion-exchange in a large pillar, obtain 930 kilograms of SiO like this 2Content is 6.24% colloidal sol.In this colloidal sol, add 66 kg water and 26 kilograms of SiO 2Content is 23.4% water glass solution.Spend the night at the room temperature heated solution then.In ion exchange column, colloidal sol is carried out cationic exchange, regulate pH value back adding sodium aluminate in a reaction vessel and carry out the aluminium modification.The consumption of aluminate solution is 7.2 kilograms, is to dilute with 22.8 gram kg water.Total charging time is 4 hours.The specific surface area of the sol particle that obtains is 828 meters squared per gram, and the S-value is 25%, and surfaces of aluminum modification degree is 5%.
Embodiment 2a-2f
In the test below, the new colloidal sol that is used in combination with cationic polymers in paper industry is assessed.
Keeping characteristic measures with Britt dynamic retention jar (Britt Dynamic Drainage Jar) at 800 rev/mins.This is the method for a mensuration retention of using always in paper industry.
Dehydration characteristic is according to SCAN-C21: 65 measure in canadian standard freeness tester (CSF).In 45 seconds, under 800 rev/mins, medicine is added the Bvitt dynamic retention jar that has the sealing outlet, then the paper pulp system is transferred in the beating degree equipment.Dehydration results provides with milliliter CSF.
Embodiment 2a
In the present embodiment, paper pulp is made by the birch kraft pulp of 60% bleaching and the pine sulfate pulp of 40% bleaching.Add 30% chalk as filler in paper pulp, being diluted to concentration then is 5 grams per liters.The Na that adds 1 grams per liter again 2SO 410H 2O.
The fines content of paper pulp is the 37.2%(dry weight), the pH value is 7.5.
About cation type polymer, can separately or be used in combination substitution value and be 0.042 cationic starch (CS) and have in contour electric charge and suitable high-molecular weight cationic polyacrylamide (PAM).Use the colloidal sol G among the embodiment 1 in the present embodiment.As a comparison, use applies for that as PCT the specific surface area of disclosed aluminium modification in WO86/00100 number is the silicic acid sol of 500 meters squared per gram.Order with cationic starch, cationic polyacrylamide, colloidal sol adds medicine, measures retention then.All consumptions are listed in the table below in paper pulp system (dry weight).(table is seen the literary composition back)
Present embodiment shows with the lower commercially available colloidal sol of surface-area to be compared, and the particulate colloidal sol of the present invention that contains high-specific surface area, low S-value has remarkable improvement on retention.When using 10 kg/ton cationic starches and 0.5 kg/ton colloidal sol, retention increases to 61.2% from 47.9%, and when using 1.0 kg/ton colloidal sols, retention increases to 79.2% from 60.1%.
If add 0.3 kg/ton cationic polyacrylamide, when the colloidal sol consumption was 0.5 kg/ton, retention increased to 71.1% from 61.8%; When the colloidal sol consumption was 1.0 kg/ton, retention increased to 86.7% from 70.7%.
When using 0.3 kg/ton cationic polyacrylamide separately, retention is 53.5%, if add 10 kg/ton cationic starches in addition, retention reduces to 51.7%.Yet, be used in combination these two kinds of polymkeric substance with colloidal sol and can obtain beyond thought good result.
Embodiment 2b
Assess the dehydrating effect of Sol A, B, C and D in the present embodiment.
The mixture that paper pulp is made up of the birch kraft pulp and the 40% pine sulfate pulp of bleaching of 60% bleaching.In paper pulp, add 30% chalk as filler.It is 3 grams per liters that paper pulp is diluted to concentration, adds 1 grams per liter Na then 2SO 410H 2O.The pH value of paper pulp is 7.5, and water separation capability is 380 milliliters of CSF.The cationic polymers that uses is that substitution value is 0.038 cationic starch, and it added earlier before adding colloidal sol.As reference, using the specific surface area among the embodiment 1 is the silicon sol of the same aluminium modification of 500 meters squared per gram.
The gained result is as follows: (table is seen the literary composition back)
Clearly, Sol A to colloidal sol D be that the commercially available colloidal sol of 500 meters squared per gram is more effective all than specific surface area.
Embodiment 2c
With embodiment 2b in assessment colloidal sol E, F, G and H in the same paper pulp system.Yet before adding cationic starch, paper pulp suitably pull an oar to beating degree be 310 milliliters of CSF.When only adding 5 kg/ton cationic starches, beating degree is 360 milliliters of CSF.In the test of listing below, same cationic starch among use and the embodiment 2a, consumption is 5 kg/ton, it added before colloidal sol.As reference, same commercially available colloidal sol in use and the previous embodiment.(table is seen the literary composition back)
Can find out obviously from present embodiment, compare that the consumption of new colloidal sol can reduce half and still obtain good equally or better result with commercially available colloidal sol.
Embodiment 2d
In order to study the effect that under the acid ph value condition, has the new colloidal sol of high-specific surface area, prepare paper pulp with 40% bleaching pine sulfate pulp and 60% bleaching birch kraft pulp, and not filled.Adjust pH to 5.3 with dilute sulphuric acid, paper pulp being diluted to concentration is 3 grams per liters again.In the paper pulp that obtains, add 0.5 kg/ton alum (with Al 2(SO 4) 318H 2The O meter).Used cation type polymer is that the substitution value that is used in combination with polymine (PEI) is 0.035 cationic starch (CS).Colloidal sol is colloidal sol L, and usefulness commercially available colloidal sol as hereinbefore is as reference.Do not add other medicine, the CSF value of paper pulp is 200 milliliters.(table is seen the literary composition back)
Embodiment 2e
In this test, study the dehydrating effect that uses different cation synthesising copolymers and cationic starch (CS) to be produced together with colloidal sol L.With with aforementioned same commercially available colloidal sol as reference.Working concentration is 3 grams per liters in the present embodiment, and the pH value is 7.8 groundwood pulp.The beating degree of not adding the paper pulp of medicine is 180 milliliters of CSF.Cation synthesising copolymer is cationic polyacrylamide (PAM), gathers (diallyl dimethylaluminum chloride) (Poly(DADMAC)) and cationic polyamido amine (PAA).(table is seen the literary composition back)
As can be seen, when colloidal sol is used in combination with cationic starch and cation synthesising copolymer, obtained unexpected improvement effect.
Embodiment 2f
Study the dehydrating effect of groundwood pulp under acid ph value in the present embodiment.The pH value of paper pulp is 5.2, and concentration is 3 grams per liters, with Al 2(SO 4O) 318H 2O is a benchmark, has added 2 kg/ton alum in the paper pulp.The original CSF value of this paper pulp is 185 milliliters.Used cation type polymer is to use separately or substitution value that the cationic polyacrylamide (PAM) same with embodiment 2a is used in combination is 0.045 cationic starch.Before add cationic polymers at adding colloidal sol (being colloidal sol L) herein.With as hereinbefore commercially available colloidal sol as reference.(table is seen the literary composition back)
These tests show that new colloidal sol has good characteristic in acid paper pulp, only need low consumption in order to obtain extraordinary result, also obtain extraordinary effect when colloidal sol is used in combination with natural cationic polymers and synthetic cationic polymers.
The commercially available colloidal sol retention of CS PAM colloidal sol G
Kg/ton kg/ton kg/ton kg/ton %
- - - - 18.0
10 35.9
0.3 53.5
10 0.3 51.7
10 0.5 61.2
10 1.0 79.2
10 0.5 47.9
10 1.0 60.1
10 0.3 0.5 71.1
10 0.3 1.0 86.7
10 0.3 0.5 61.8
10 0.3 1.0 70.7
D is commercially available for CS Sol A sol B colloidal sol C colloidal sol
Kg/ton kg/ton kg/ton kg/ton colloidal sol CSF
The kg/ton milliliter
8 - - - - - 420
8 0.5 510
8 1.0 610
8 1.5 640
8 0.5 500
8 1.0 620
8 1.5 660
8 0.5 490
8 1.0 580
8 1.5 600
8 0.5 510
8 1.0 600
8 1.5 635
8 0.5 470
8 1.0 530
8 1.5 570
H is commercially available for colloidal sol E colloidal sol F colloidal sol G colloidal sol
Colloidal sol CSF
Kg/ton kg/ton kg/ton kg/ton kg/ton milliliter
0.25 405
0.5 415
0.25 420
0.5 430
0.25 425
0.5 445
0.25 395
0.5 415
0.25 375
0.5 400
Commercially available
CS PEI colloidal sol L colloidal sol CSF
Kg/ton kg/ton kg/ton kg/ton milliliter
5 0.25 215
5 0.25 0.75 310
5 0.25 0.75 260
Poly is commercially available
CS PAM (DADMAC) PAA colloidal sol L colloidal sol CSF
Kg/ton kg/ton kg/ton kg/ton kg/ton kg/ton milliliter
6 240
6 0.3 310
6 0.3 295
6 0.3 285
6 1.0 395
6 1.0 330
6 0.3 1.0 500
6 0.3 1.0 395
6 0.3 1.0 455
6 0.3 1.0 345
6 0.3 1.0 425
6 0.3 1.0 340
Commercially available
CS PAM colloidal sol L colloidal sol CSF
Kg/ton kg/ton kg/ton kg/ton milliliter
10 5 0.75 345
5 1.0 365
5 0.5 375
5 0.75 395
15 5 0.2 0.5 400
5 0.2 0.75 430
5 0.2 0.5 470
5 0.2 0.75 500

Claims (5)

1, silicon sol, it is characterized in that this colloidal sol forms the corresponding S-value of degree of aggregate or microgel in 8% to 45% scope, and the specific surface that contains useful sodium hydroxide titration determination is at 750-1, silica dioxide granule in the 000 meters squared per gram scope, and particle to carry out surface modification to modification degree with aluminium be 2-25%.
2,, it is characterized in that the silicon-dioxide specific surface area is in 800-950 meters squared per gram scope according to the silicon sol of claim 1.
3, according to the silicon sol of claim 1 or 2, the S-value that it is characterized in that colloidal sol is in the 10-30% scope.
4, produce the method for silicon sol, it is characterized in that it comprises that it is in the 1-4 scope that water glass solution is acidified to pH value, the acid-sol of gained is alkalized SiO in the alkalization process 2Content is in 7-4.5%(weight) in the scope, the particle growth that makes colloidal sol to the specific surface area of sodium hydroxide titration determination at 750-1, in the 000 meters squared per gram scope and with aluminum oxide particle surface is carried out modification, to the modification degree be 2-25%.
5,, it is characterized in that alkalizing with water glass solution according to the method for claim 4.
CN 90109033 1990-11-09 1990-11-09 Silica sol, method for producing silica sol and use of silica sol Expired - Lifetime CN1029950C (en)

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CZ301699B6 (en) * 1999-05-04 2010-05-26 Akzo Nobel N. V. Sols containing silica-based particles
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