FI56872C - FOERFARANDE FOER FRAMSTAELLNING AV EN BESTRYKNINGSTALKPRODUKT I FORM AV EN ELLER FLERA KOMPONENTER - Google Patents

Description

IVgftr'i [B] (11) ^ ANNOUNCEMENT

WgjD LJ V 'UTLÄGGN I NGSSKRIFT 000/2 C · (45) Patent granted 10 04 1900 Patent oeddelat * (51) Kv.ik. * / Int.ci. · D 21 H 1/22 D 21 H 3/66 ENGLISH - FINLAND (21) p »Mnttlh * k * m« * - Ρ «· η« η · <ΛηΙηχ 763086 (22) Hik «ml * pllvl - Aiu & knlngtdtj 29.10.76 '(23) Alkuplivt — GHtl | h« tfd « | 29.lO.76 (41) Tullut | ulkli «kil - Bllvlt off * ntllj 30. oU. 78 _ _ '(44) NihUvilulptfton and the month * date. -

Patent- och registratyrelsen 'AmMun uthfd och utUkrift · »publkwrad 31.12.79 (32) (33) (31) Privilege requested —Begird priority (71) Yhtyneet Paperitehtaat Oy, Suomen Talkki, A 6Ö3 88999 Kajaani, - Finland-Finland (FI ) (72) Jouni Juhani Huuskonen, Sotkamo, Keijo Frithiof Aunio, Valkeakoski,

Paavo Sakari Lampela, Sotkamo, Mauno Sakari Huovinen, Sotkamo,

Suomi-Finland (FI) - (7¾) Oy Kolster Ab (5¾) Method for the manufacture of a one- or more-component coating beam product - Förfarande för framställning av en bestiykningstalk-product i forma av en eller flera components

The invention relates to a process for the preparation of a one- or more-component coating talc product. In addition to traditional areas of use, talc has been used successfully in Finland for some time as a paper filler. Its use in paper coating has also been studied. The results obtained have shown that talc is suitable to replace the most commonly used coating pigment, kaolin, when considering the paper-technical properties it gives to paper coatings.

However, the use of talc for paper coating has been hampered by difficulties in slurrying ββη into water as a sufficiently fluid and high solids slurry. For coating in general, kaolins can be slurried on a factory scale in about 30-40 minutes, up to a slurry with a solids content of more than $ 70 and a Brookfield viscosity (100 rpm) of less than 300 mPas. This must also be considered as an objective in the slurrying of the coating.

The slurry difficulties of talc are mainly due to its inherent B 28 C 1/02 2 56872 hydrophobicity, which is manifested by a slow slurry rate and an attempt to increase the viscosity of the slurry. As a result, the solids concentrations achieved with the coating talc have been clearly lower and the slurry production rates have been significantly lower than those achieved with the coating kaolins.

U.S. Patent No. 28UUU86 and Wochenblatt fur Papierfabrikation 102 (197¾): 5, 151-15¾ disclose methods for dispersing coating talc based on converting the hydrophobic surface of talc to hydrophilic by suitable chemical treatment. However, these methods have not led to the realization of the sub-objectives of slurrying, both fast slurrying and good result, compared to kaolin well enough.

With the method according to the invention, it is possible to produce a high-solids and more fluid talc slurry for coating and other similar purposes of paper and board, which is clearly faster than before.

The process according to the invention is characterized in that A) 3 fine-grained talc with a bulk density of 200-1 * 00 kg / m 3 are granulated to obtain a granular product with a grain size of 1 to 15 mm »preferably 3 to 6 mm, and bulk density 600 ...

1500 kg / m 2, preferably 900 to 1200 kg / m 2, and that B) either before granulation, during granulation or after granulation, the talc is moistened and / or a surfactant, polyelectrolyte, antifoam, or carboxymethylcellulose and polyelectrolyte are added, and optionally other excipients, after which the product obtained is, if desired, slurried in water or in an aqueous solution containing one or more of said additives in order to obtain a slurry containing more than 60% by weight of talc.

The process according to the invention raises the inherently low bulk density of talc and reduces the "effective" external surface area by suitable mechanical treatment and changes the surface chemical properties of the talc by suitable chemical treatment at the same time or later during application. The combination of mechanical and chemical treatment is essential. Separately, neither of them will achieve the desired result.

The dispersion itself can be performed with normal mixers, although their structure and mode of operation affect both the speed of dispersion and its end result.

Both mechanical and chemical treatment are described in more detail below.

Mechanical treatment

The mechanical treatment of talc comprises the compression of talcum powder into pellets, preferably together with water or steam, optionally in the presence of the above-mentioned active ingredients. The treatment can be performed with conventional commercial presses. The pelletization increases the bulk density of the talc powder from 200 to 400 kg / m 2 to a range of 600 to 1500, preferably 900 to 1200 kg / m 2. The bulk density of the private pellet rises to 1400 ... 2000 kg / m 2. The bulk density of the pellets can be adjusted by the dimensions of the press matrix. A suitable pellet size is, for example, $ 3 ... 6 mm and a length of the same size.

As a result of the pelletization, the talc does not float on the surface of the water as is the case with untreated talc, but easily sinks in order to be quickly subjected to a dispersing event in the dispersing device. When the air content of the talc decreases to approximately one-fifth in the pelletization, considerably less air also enters the sludge. This lowers the viscosity of the slurry and thus accelerates the settling and disintegration (dispersion) of the agglomerates.

Chemical treatment

The chemical treatment of talc according to the method comprises the addition of the following chemicals: - surfactant - polyelectrolyte - defoamer or - carboxymethylcellulose - polyelectrolyte

The surfactant is adsorbed on the talc plate surfaces, rendering them hydrophilic. In addition to the surfactant, conventional polyelectrolytes must also be used in the dispersion of kaolin to increase the repulsive forces (to reduce the viscosity and to stabilize the dispersion). The surfactant easily foams and stabilizes air bubbles in the slurry. For this reason, a defoaming chemical should also be added to the sludge.

Of the surfactants, alkylphenyl ethylene oxide sulfates have proven to be the best. The suitable length of the ethylene oxide chain of the hydrophilic moiety is 10 to 20 units. Of the nonionic surfactants, ethylene oxide adducts containing an aromatic ring have also proven to be the best. The optimal dose of surfactant for talc with even a fine fineness is 0.8-2.0, preferably about 1.5% by weight of talc,

Suitable polyelectrolyte is the standard polyacrylates and polyphosphates used for dispersion. Tetrasodium pyrophosphate at a dose of 0.3 ···! »2 # by weight of pigment has proved to be particularly suitable.

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Several commercial chemicals are suitable as antifoams. Preferred antifoams are e.g. various fatty acid and silicone derivatives, fatty alcohols and phosphoric acid derivatives. The appropriate dose varies depending on the chemical in the range 0.5 ·· * 0.2% by weight of the pigment.

Of course, previously known chemicals such as carboxymethylcellulose and various nonionic surfactants can also be used for chemical treatment. The benefits of mechanical treatment are also evident when using these, although results as good as those described above cannot be obtained.

The addition of chemicals can be carried out during mechanical treatment or at the beginning of the actual dispersion in water. It has been found advantageous to add at least a portion of the chemical dose only during dispersion.

The invention is illustrated by the following examples:

Example 1

Fine talc (Finntalc C10 talc, manufactured by Suomen Talki, 67% of the particles <3 ^ un) with a bulk density of about 250 kg / m 3 was compressed into pellets with a pelletizing press of k ... 5 mm size. In the same apparatus, the talc was moistened with a mixture of water and steam to 10% moisture before being pelletized. The product was dried. The bulk density of the product after treatment was 11 ^ 0 kg / m 2.

The product thus obtained (2500 g) was treated in an Diaf mixer with an aqueous solution of 1133 g of water, 37.5 g of alkylphenylethylene oxide sulphate (Perlankrol RN75 »manufactured by Lankro Chemicals Ltd, Great Britain), 12.5 g of tetrasodium pyrophosphate and 2 g of antifoam Etingal L, manufactured by BASF, BRD).

The talc was able to add U min to the mixer while maintaining the flowability of the mixture.

during.

The mixture was then stirred for 1 + 0 min. In a Diaf mixer (1 + 000 rpm) and a homogeneous liquid talc slurry with a viscosity (Brookfield 100 rpm) of 1 + 20 mPas and a solids content of 69.2% was obtained.

Example 2

A fine solution of 38ΟΟ g of water, 150 g of alkylphenylethylene oxide sulfate Perlankrol RN75 and 16 g of antifoam (Nopco NXZ fatty acid ester, manufactured by Diamond Shamwock Corporation, USA) was mixed with finely divided talc (Finntalc C10) (20 g).

The product thus obtained was compressed into granules having a size of about 5 mm. Bulk-

O

the density was then 111 + 0 kg / m.

The obtained product (2500 g) was dispersed in a Diaf mixer (1 + 00 rpm) in an aqueous solution containing 111 + 5 g of water, 22.5 g of alkylphenylethylene oxide sulphate Perlankrol RN75 and 12.5 g of tetrasodium pyrophosphate.

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The required talc addition time was 5 min. The viscosity of the talc slurry obtained by Ho min dispersion (Brookfield 100 r / min) was 1380 mPas and the solids content was 69 * 1% ·

Example 3

The granulated product described in Example 1 (2500 g) was treated in an Diaf mixer with an aqueous solution of 1165 g of water, 25 g of carboxymethylcellulose and 17-5 g of sodium polyacrylate (Polysalz CA, manufactured by PASF, BRD).

The addition time of talc allowed for the fluidity of the slurry was 4 min. The mixture was stirred for Ho min to give a slurry having a Brookfield viscosity (100 rpm) of 1080 mPas and a solids content of 68.6%.

Example H

Fine talc (Finntalc C10) moistened with 22% moisture was compressed with a pelletizing press into 5 ·· * 6 mm granules. The bulk density 3 of the product obtained was about 950 kg / m 2.

The product thus obtained (192 kg, dry matter 150 kg) was treated in Oy Keskus-laboratorio Ab's Kady mixer with an aqueous solution of 35 → 5 kg of water, 2.25 kg of alkylphenylethylene oxide sulphate (Perlankrol RN75 manufactured by Lankro Chemicals Ltd, Great Britain ), 0.75 kg of sodium hexametaphosphate and 0.12 kg of antifoam (Etingal L fatty acid ester, manufactured by BASF, BRD).

The talc was able to be added for 15 min while maintaining the flowability of the mixture. during.

Ho min. the viscosity of the slurry obtained after mixing (Brookfield 100 rpm) was 300 mPas and the solids content was 66.2%.

Example 5

Approximately 27% of the fine talc moistened with moisture (Finntalc C10) was pelletized into 5 ··· 6 mm granules. The bulk density of the product was about 970 kg / m 2.

✓

The product (H110 kg, 3000 kg dry matter) was treated in Yhtyneet Paperitehtaat Oy's Simpele Jylhä mixer with an aqueous solution containing 376 kg water, Π5 kg alkylphenylethylene oxide sulphate (Perlankrol RN75 »manufactured by Lankro Chemicals Ltd, Great Britain), 2, H kg antifoam (fatty acid ester Nopco NXZ, manufactured by Diamond Shamrock Corporation, USA) and 15 kg of sodium hexametaphosphate.

The mixture remained sufficiently fluid when talc was added over 55 min.

After mixing for 3 minutes, the viscosity of the slurry (Brookfield 100 rpm) was 2 to 30 mPas and the solids content was 67.1% ·

Example 6

The granulated product described in Example H (192 kg, 150 kg dry matter) was treated with a Kady mixer from Oy Keskuslaboratorio Ab (KCL) with an aqueous solution containing Π5 kg of water, 1.5 kg of carboxymethylcellulose and 1.2 kg of sodium polyacrylate.

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The talc addition time was 35 min. Uo min. after mixing, the viscosity of the slurry (Brookfield 100 rpm) was 210 mPas and the solids content 63 »9

Example 7

The granulated product described in Example 5 (U110 kg, 3000 kg dry matter) was treated in a Simpele Jylhä mixer of Yhtyneet Paperitehtaat Oy with an aqueous solution of 586 kg of water, 30.0 kg of carboxymethylcellulose and 2U, 0 kg of sodium polyacrylate.

Addition of talc was performed for 6k min. during. The viscosity of the resulting slurry (Brookfield 100 rpm) was Uo min. after mixing 1150 mPas and solids content 61 », 3% ·

Example 8

The granulated product described in Example 1 (150 kg) was treated in Oy Keskus Laboratory Ab's (KCL) Kady mixer with an aqueous solution of 67 kg of water in 2.25 kg of alkylphenylethylene oxide sulphate (Perlankrol RN75 »manufactured by Lankro Chemicals Ltd. United Kingdom) 0.75 kg of sodium hexametaphosphate and 0.15 kg of antifoam (fatty acid ester Nopco NXZ, manufactured by Diamond Shamrock Corporation, USA). The talc addition time was 25 min. The viscosity of the resulting slurry (Brookfield 100 rpm) was 10U0 mPas' after stirring for 25 minutes and the solids content was 69-6%.

Example 9

The granulated product (2500 g) described in Example 1 was treated in an Diaf mixer with an aqueous solution of 11 g of water, 38 g of alkylphenylethylene oxide (Ethylan BV, manufactured by Lankro Chemicals Ltd, UK), 12.5 g of tetrasodium pyrophosphate and 2 g antifoam (fatty acid ester Etingal L, manufactured by BASF, BRD), The addition time of talc allowed for the fluidity of the slurry was 6 min.

After stirring for 1 »0 minutes, the viscosity of the slurry (Brookfield 100 rpm) was 8U0 mPas and the solids content was 69> 1

Comparative tests:

For comparison, Laboratory, pilot, and factory-scale dispersion comparison experiments were performed with non-pelletized talc using various chemicals, and with typical coating kaolins Dinkie A and SPS (manufactured by English China Clays Ltd.). The results are shown in Tables 1 and 2. The tables also show, on the one hand, the results of experiments obtained using non-pelletized talc and the chemicals according to the invention and, on the other hand, pelletized talc and the chemicals according to the invention.

The bulk densities of the studied products ranged from 6U0 to 1300 kg / m 2. Combinations of surfactants (Perlankrol RN75 and Ethylan BV) - polyelectrolyte tetrasodium pyrophosphate antifoam, and carboxymethylcellulose and polyelectrolyte were used as chemicals.

7 56872

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Based on the results, it can be stated that - pelletization accelerates the slurrying of talc so that the addition time of talc is reduced to about 1/6 on a laboratory scale, The use of Perlankrol HN75 -type anionic surfactant, alkylphenylethylene oxide sulphate, achieves higher solids levels at the same viscosity level as the best nonionics used previously or with carboxymethylcellulose, not using with active substances, - by using alkylphenylethylene oxide sulphate, the level of normal coating kaolins is reached in the laboratory scale with regard to the properties of the slurry.

In addition, it was found that the slurry slows down if the pellets are made too compact (bulk density of the pellets over 1300 kg / m 2).

By combining pelletization with the appropriate use of an anionic surfactant, the coating talc can be dispersed in a laboratory scale like normal coating kaolins in terms of both the slurry rate and the fluidity of the final slurry.

Summary of the pilot and factory scale experiments shown in Examples 4-7

The applicability of the method on a larger scale has so far been assessed by only a few pilot and factory-scale diepergization experiments. The evaluation was significantly hampered by the high humidity of the products studied (pilot measure 22 96, factory tests $ 27) · The results obtained therefore do not give a full picture of the benefits of the method. The summary is shown in Table 2. For comparison, previous experiments have been performed.

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Based on the results, the following conclusions can be drawn: - pelletization significantly shortens the addition time of talc when using both carboxymethylcellulose and a surfactant dispersant,

Claims (11)

A process for producing a coating talc product in one or two components, characterized in that A) granulated bark having a bulk volume of 200-400 kg / m 2 is granulated to obtain a granular product having a grain size of 1-15 mm, 3-6 mm, and the volume of acrylic 600-1500 kg / m 2, preferably 900-1200 kg / m 2, and B) the tallow either before or after the granulation or after the granulation is moistened and / or moistened with a surfactant; a polyelectrolyte, an anti-coagulant or carboxymethyl cellulose and polyelectrolyte, and possibly other additives, after which the obtained sample, if desired, contains 1 aqueous solution containing one or more of the said salts an auapenalon with over 60 weight-96 taik. 2. A process according to claim 1, characterized in that A) finely divided particles having a bulk volume of 200-400 kg / m 2, which has preferably been moistened with water and / or even to a moisture content of 5-30 i, are granulated to obtain a granular product having a grain size of 1-15 mm, preferably 3-6 mm, and bulk volume 600-1500 kg / m 2, preferably 900-1200 kg / m 5, and B) 1> 5-4 parts by weight of the obtained granular talc a weight portion of aqueous solution of the following composition: a) 1.5-6 weight-96 surfactant, preferably an anionic surfactant, b) 0.5-4 weight polyelectrolyte, and possibly 0.1% 1 weight loss prevention agent, and d) possibly other additives. 3. A process according to claim 1, characterized in that A) finely divided wafer having a bulk volume of 200-400 kg / m 2, which has preferably been wetted with water and / or water vapor to a moisture content of 5-3Ο ia to obtain a granular product having a grain size of 1-15 mm, preferably 3-6 mm, and bulk weight 600-1500 kg / m 2, preferably 900-1200 kg / m 2, and B) the obtained granular talc is treated with an aqueous solution of the following composition: a) 10-50 wt. surfactant, preferably an anionic surfactant, b) 5-20 wt. polyelectrolyl, and o) 1-10 wt. foam preventing agent, and d) possibly other additives, and e) pick up the obtained grainy product, if desired in water or in an aqueous solution containing one or more of the substances listed in item (b) (a) to (d). 4. A process according to claim 1, characterized in that A) finely divided particles having a bulk volume of 200-400 kg / m3 are added to the following substances: a) 0.8-2 to 5% preferably 1-1.5 fit of the talc selected, surface active agent, preferably an anionic surfactant, b) 0.3-1.2 µm, preferably 0.5-1 fit of tallow weight, polyelectrolyte, and c) 0.05-0.2 fit preferably 0.1-0.15 µm and, d) possibly other additives, and B) the obtained mixture grannierae to obtain a granular product having a grain size of 1-15 mm, preferably 5-6 mm, and the volume of acrylic 600-1500 kg. and (c) the granular product obtained, if any, in water or in an aqueous solution containing one or more of the substances listed in (A) (a) to (d). Method according to claim 1, characterized in that during the granulation step, the talcum powder is moistened with 5-15 wt. 56 aqueous solution having the following composition: a) 10-15 wt.% Surfactant, preferably an anionic surfactant, b) 0-20 w. -j polyelectrolyte, and c) 1-10 weight-96 foaming prevention agents, and d) possibly other additives; then, if desired, 1-5 parts by weight of the obtained granular talc product suspended in one part by weight of water or an aqueous solution Containing amounts of one or more of the previously listed substances a) -d). Process according to claims 1-5, characterized in that as an surfactant an anionic surfactant is used, preferably an alkylphenylethylene oxide sulfate. 7. A method according to claims 1-5, characterized in that as a surfactant, a non-ionic surfactant is used.