CN100335437C - High solid content gypsum sizing material and preparing process thereof - Google Patents
High solid content gypsum sizing material and preparing process thereof Download PDFInfo
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- CN100335437C CN100335437C CNB2005100310418A CN200510031041A CN100335437C CN 100335437 C CN100335437 C CN 100335437C CN B2005100310418 A CNB2005100310418 A CN B2005100310418A CN 200510031041 A CN200510031041 A CN 200510031041A CN 100335437 C CN100335437 C CN 100335437C
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Abstract
The present invention discloses a gypsum sizing material with high solid content and a preparing method thereof. The gypsum sizing material with high solid content being 30 to 80% has more than 30% of particles of which the size is smaller than 2 mu m in the total particle amount, and the viscosity of the sizing material is smaller than 1000 centipoises. Meanwhile, the present invention also discloses a method for preparing two dispersing agents used for dispersing thegypsum sizing materials with high solid content. The gypsum sizing material of the present invention is mainly used for filling and coating paper.
Description
Technical field
The present invention relates to a kind of gypsum slurry and preparation method thereof, relate in particular to a kind of gypsum slurry that adding of paper fill out and be coated with that is used for.
Technical background
Gypsum can be divided into the plaster of paris and crown filler by its source, and the plaster of paris is at Chinese aboundresources, and storage capacity occupies first place in the world.The crown filler is mainly derived from industrial by-products, in flue gas desulfurization course, absorbs sulfurous gas with calcium hydroxide, makes dihydrate gypsum through oxidation again; Also by-product gypsum in the production process of phosphoric acid.
The comprehensive utilization of industry by-product gypsum not only helps environment protection, also makes industrial by-products obtain effective utilization, is a good job of benefiting the nation and the people.
Gypsum is as a kind of white pigment, its whiteness height, and to the good stability of soda acid, real density is little, and higher relatively specific refractory power is arranged, and hardness is low.Make the coating that slurry is used for paper with gypsum, coating whiteness height; Ink receptivity is good; Acid still alkaline technology all adapts to; When coat-thickness was identical, the slurry consumption was few; When coating wt is identical, thick coating; Little to the coating apparatus wearing and tearing.
At present, the gypsum slurry of routine techniques preparation, solid content is low, and particle is big, bad dispersibility, slurry stability is bad, and the viscosity height can not satisfy the needs of field of papermaking, as U.S. Pat 6852159 disclosed technology, need improve.
Technology contents
The technical issues that need to address of the present invention are to disclose a kind of high solid content gypsum sizing material and preparation method thereof, to overcome the above-mentioned defective that prior art exists, satisfy the needs of field of papermaking.
Another technical problem that the present invention need solve is to disclose a kind of dispersion agent 1 and dispersion agent 2, is used to prepare high solid content gypsum sizing material.
The component and the weight content of high solid content gypsum sizing material of the present invention comprise:
Terra alba 3-80%
Dispersion agent 1 0.1-5%
Dispersion agent 2 0.1-5%
Water surplus
The gypsum particle granularity accounts for more than 30% of total number of particles for the particle less than 2 μ m in the slip, and slurry viscosity is the 10-1000 centipoise.
Said terra alba is selected from a kind of or its mixture in the plaster of paris, crown filler, dihydrate gypsum, semi-hydrated gypsum or the anhydrite;
Said dispersion agent 1 and dispersion agent 2 all are dispersion agents efficiently, add dispersion agent 1 and dispersion agent 2 in the product and can reduce reunion between the particle, reduce milling time, make macrobead be worn into small-particle easily;
Said dispersion agent 1 is preparation like this:
(1) mixture heating up to the temperature with 100～150 parts of water and 1 part of initiator is 60～85 ℃;
(2) the mix monomer B of 20～100 weight parts and the mix monomer A of 15～100 weight parts are added dropwise in the mixture of step (1) simultaneously, the control rate of addition, with 1 part of initiator is benchmark, control mix monomer A rate of addition is 8.9 parts/hour, the rate of addition of mix monomer B is 15.6 parts/hour, or control mix monomer A rate of addition is 5.13 parts/hour, and the rate of addition of mix monomer B is 5.67 parts/hour, and mix monomer B and mix monomer A are dripped simultaneously;
(3) be warming up to 80～95 ℃, be incubated 30～60 minutes, obtain dispersion agent 1;
Said initiator is selected from a kind of or its mixture in ammonium persulphate, Sodium Persulfate, Potassium Persulphate, hydrogen peroxide, hydrogen peroxide butyl, di-tert-butyl peroxide, peroxidation two formyls, the Diisopropyl azodicarboxylate;
The component of said mix monomer A and parts by weight are:
Methacrylic acid 1-5 part
Vinylformic acid 10-50 part
Methyl methacrylate 5-30 part
Butyl methacrylate 2-15 part
The component of said mix monomer B and parts by weight are:
Acrylamide 0.5-10 part
Vinyl cyanide 1-15 part
Deionized water 20-80 part
Initiator 0.1-1.5 part
Mix monomer A can adopt the method for conventional physical mixed to be prepared;
Mix monomer B is preparation like this: add entry earlier, under constantly stirring, add acrylamide, vinyl cyanide, initiator respectively, obtain mix monomer B solution.
Said dispersion agent 2 is preparations like this:
(1) water of 150～200 weight parts and the initiator of 1 weight part are heated to 60～85 ℃;
(2) then the mix monomer C of 165～265 weight parts and the mix monomer D of 50～80 weight parts are added dropwise in the mixture of step (1) simultaneously, the control rate of addition, with 1 part of initiator is benchmark, the rate of addition of mix monomer C be 15～50 weight parts/hour, the rate of addition of mix monomer D be 5.0～15 weight parts/hour, and mix monomer C and mix monomer D are dripped simultaneously;
(3) be warming up to 80～95 ℃, be incubated 30～120 minutes, obtain dispersion agent 2;
The component of said mix monomer C and weight content are:
Methacrylic acid 1-5 part
Vinylformic acid 25-35 part
Vinyl cyanide 3-10 part
Methylpropene sodium sulfonate 20-35 part
Sodium styrene sulfonate 15-20 part
Acrylamide 1-10 part
Deionized water 100-150 part
Initiator 0.1-2.5 part
The component of said mix monomer D and weight content are:
Methyl methacrylate 30-50 part
Butyl methacrylate 20-30 part
Said initiator is selected from a kind of or its mixture in ammonium persulphate, Sodium Persulfate, Potassium Persulphate, hydrogen peroxide, hydrogen peroxide butyl, di-tert-butyl peroxide, peroxidation two formyls, the Diisopropyl azodicarboxylate;
Mix monomer D can adopt the method for conventional physical mixed to be prepared;
Mix monomer C is preparation like this: add entry earlier, under constantly stirring, add methacrylic acid, vinylformic acid, vinyl cyanide, methylpropene sodium sulfonate, Sodium styrene sulfonate, acrylamide, initiator respectively, obtain mix monomer C solution.
The preparation method of high solid content gypsum sizing material of the present invention comprises the steps:
Terra alba and water are mixed together, add dispersion agent during mixing, ground then 1～3 hour, the particle diameter that is ground to terra alba accounts for more than 30% of total number of particles less than the particle of 2 μ m, add auxiliary dispersants then, stirred then 0.5～3.0 hour, promptly obtain gypsum slurry, wherein, the weight solid content of terra alba is for containing 30～80%.
Adopt the gypsum slurry of method for preparing, the solid content height, particle is little, good dispersity, the slurry good stability, viscosity is low, and high solid content gypsum sizing material of the present invention is mainly used in adding of paper and fills out and be coated with, and can satisfy the needs of field of papermaking.
Embodiment
Embodiment 1
Synthesizing of dispersion agent 1:
Mix monomer A
Methacrylic acid 35g
Vinylformic acid 250g
Methyl methacrylate 150g
Butyl methacrylate 100g
Above-mentioned raw material is mixed, promptly obtain mix monomer A;
Mix monomer B
Acrylamide 70g
Vinyl cyanide 60g
Deionized water 800g
Initiator ammonium persulfate 8g
Mix monomer B is preparation like this: add 800g water earlier, under constantly stirring, add acrylamide, vinyl cyanide, initiator respectively, obtain mix monomer B solution.
In the stirring tank of 5 liters of strap clamp covers and reflux condensate device, add 1200g water and 10g initiator ammonium persulfate, stirring heating, when temperature is raised to 80 ℃, slowly drip mix monomer A and mix monomer B simultaneously, mix monomer A rate of addition is 89g/ hour, and the rate of addition of mix monomer B is 156g/ hour, control mix monomer A and mix monomer B drip simultaneously, be warmed up to 90 ℃ after dropwising, and under this temperature, be incubated 1 hour, obtain dispersion agent 1;
Synthesizing of dispersion agent 2:
Mix monomer C
Methacrylic acid 20g
Vinylformic acid 300g
Vinyl cyanide 80g
Methylpropene sodium sulfonate 280g
Sodium styrene sulfonate 180g
Acrylamide 60g
Deionized water 1200g
Initiator ammonium persulfate 10g
Mix monomer D
Methyl methacrylate 450g
Butyl methacrylate 240g
In the stirring tank of 8 liters of strap clamp covers and reflux condensate device, add 1800g water and 15g initiator ammonium persulfate, stirring heating, when temperature is raised to 80 ℃, slowly drip the aqueous solution and the mix monomer D of mix monomer C simultaneously, mix monomer C rate of addition is 213g/ hour, and the rate of addition of mix monomer D is 69g/ hour, control mix monomer C and mix monomer D drip simultaneously, be warmed up to 90 ℃ after dropwising, and under this temperature, be incubated 1 hour, obtain dispersion agent 2;
In 100 liters steel basin, add 30 premium on currency, begin to stir, add 70kg200 purpose natural gesso, add the 400g dispersion agent, with being pumped into two placed in-line sand mills of 20 liters, slurry behind the sand milling carries out analytical test with the laser light scattering particle size analyzer, records granularity 82% less than 2 μ m, with pump slurry is sent in another 100 liters of steel basins, add the 500g auxiliary dispersants then, stirred 1 hour, and promptly obtained the gypsum slip, the slurry weight solid content is 69.5%.
Adopt the method for ISO 2884-2-2003 standard code, recording slurry viscosity with NDJ-1 type rotational viscosimeter is 180 centipoises.
Is in 300 the whizzer centrifugal 3 hours with slurry at separation factor, and the bottom sediment is 1.2% (weight), and can be evenly dispersed in the slurry again after stirring.
Embodiment 2
Adopt the dispersion agent 1 and dispersion agent 2 of embodiment 1.
In 100 liters steel basin, add 43 premium on currency, open stirring, add 70kg200 purpose phosphoric acid production by-product gypsum powder, add 350g dispersion agent 1, with being pumped into two placed in-line sand mills of 20 liters, slurry behind the sand milling carries out analytical test with the laser light scattering particle size analyzer, record granularity 90% less than 2 μ m, with pump with slurry send into another 100 liters of steel basins in, add 400g dispersion agent 2 then and stirred 2 hours, promptly obtain gypsum slip of the present invention, slurry solid content 61.5%.
Adopt the method for ISO 2884-2-2003 standard code, recording slurry viscosity with NDJ-1 type rotational viscosimeter is 180 centipoises.
Is in 300 the whizzer centrifugal 3 hours with slurry at separation factor, and the bottom sediment is 1.4% (weight), and can be evenly dispersed in the slurry again after stirring.
Embodiment 3
Adopt the dispersion agent 1 and dispersion agent 2 of embodiment 1.
In 100 liters steel basin, add 33 premium on currency, open stirring, add 67kg200 purpose semi-hydrated gypsum powder, add 380g dispersion agent 1, with being pumped into two placed in-line sand mills of 20 liters, slurry behind the sand milling carries out analytical test with the laser light scattering particle size analyzer, record granularity 95% less than 2 μ m, with pump with slurry send into another 100 liters of steel basins in, add 550g dispersion agent 2 then and stirred 3 hours, promptly obtain gypsum slip of the present invention, slurry solid content 66.3%.
Adopt the method for ISO 2884-2-2003 standard code, recording slurry viscosity with NDJ-1 type rotational viscosimeter is 220 centipoises.
Is in 300 the whizzer centrifugal 3 hours with slurry at separation factor, and the bottom sediment is 1.6% (weight), and can be evenly dispersed in the slurry again after stirring.
Embodiment 4
Synthesizing of dispersion agent 1:
Mix monomer A
Methacrylic acid 80g
Vinylformic acid 380g
Methyl methacrylate 100g
Butyl methacrylate 30g
Above-mentioned raw material is mixed, promptly obtain mix monomer A;
Mix monomer B
Acrylamide 120g
Vinyl cyanide 100g
Deionized water 700g
Initiator hydrogen peroxide butyl 20g
Mix monomer C
Methacrylic acid 40g
Vinylformic acid 450g
Vinyl cyanide 20g
Methylpropene sodium sulfonate 310g
Sodium styrene sulfonate 230g
Acrylamide 10g
Deionized water 1000g
Initiator hydrogen peroxide butyl 30g
Mix monomer D
Methyl methacrylate 520g
Butyl methacrylate 200g
The preparation method of dispersion agent 1 and dispersion agent 2 is with embodiment 1.
In 100 liters steel basin, add 40 premium on currency, open stirring, add 80kg200 purpose anhydrite powder, add 250g dispersion agent 1, with being pumped into two placed in-line sand mills of 20 liters, slurry behind the sand milling carries out analytical test with the laser light scattering particle size analyzer, records granularity 85% less than 2 μ m, with pump with slurry send into another 100 liters of steel basins in, add 650g dispersion agent 2 then, stirred 2 hours, and promptly obtained gypsum slip of the present invention, slurry solid content 65%.
Adopt the method for ISO 2884-2-2003 standard code, recording slurry viscosity with NDJ-1 type rotational viscosimeter is 180 centipoises.
Is in 300 the whizzer centrifugal 3 hours with slurry at separation factor, and the bottom sediment is 1.5% (weight), and can be evenly dispersed in the slurry again after stirring.
Embodiment 5
Synthesizing of dispersion agent 1:
Mix monomer A
Methacrylic acid 28g
Vinylformic acid 200g
Methyl methacrylate 310g
Butyl methacrylate 80g
Mix monomer B
Acrylamide 65g
Vinyl cyanide 82g
Deionized water 500g
Initiator hydrogen peroxide butyl 25g
In the stirring tank of 5 liters of strap clamp covers and reflux condensate device, add 1500g water and 15g initiator Sodium Persulfate, open stirring heating, when temperature is raised to 75 ℃, slowly drip mix monomer A and mix monomer B simultaneously, the rate of addition of mix monomer A is 77g/ hour, the rate of addition of mix monomer B is 85g/ hour, and control mix monomer A and mix monomer B drip simultaneously;
Mix monomer A and mix monomer B drip simultaneously, are warmed up to 90 ℃ after dropwising, and are incubated 45 minutes under this temperature.
Synthesizing of dispersion agent 2:
Mix monomer C
Methacrylic acid 15g
Vinylformic acid 250g
Vinyl cyanide 100g
Methacrylic sulfonic acid 320g
Sodium styrene sulfonate 160g
Acrylamide 75g
Deionized water 1000g
Initiator Sodium Persulfate 25g
Mix monomer D
Methyl methacrylate 380g
Butyl methacrylate 310g
In the stirring tank of 8 liters of strap clamp covers and reflux condensate device, add 2000g water and 15g initiator Sodium Persulfate, open stirring heating, when temperature is raised to 85 ℃, slowly drip the mix monomer C aqueous solution and mix monomer D simultaneously, the rate of addition of mix monomer C is 243g/ hour, the rate of addition of mix monomer D is 86g/ hour, and control mix monomer C and mix monomer D drip simultaneously;
Be warmed up to 90 ℃ after dropwising, and under this temperature, be incubated 1 hour.
In 100 liters steel basin, add 35 premium on currency, open stirring, add 75kg200 purpose natural gesso, add 300g dispersion agent 1, with being pumped into two placed in-line sand mills of 20 liters, the slurry behind the sand milling carries out analytical test with the laser light scattering particle size analyzer, record granularity 78% less than 2 μ m, with pump with slurry send into another 100 liters of steel basins in, add 450g then and go into dispersion agent 2 and stir and promptly obtained gypsum slip of the present invention, slurry solid content 67% in 3 hours.
Adopt the method for ISO 2884-2-2003 standard code, recording slurry viscosity with NDJ-1 type rotational viscosimeter is 150 centipoises.
Is in 300 the whizzer centrifugal 3 hours with slurry at separation factor, and the bottom sediment is 1.8% (weight), and can be evenly dispersed in the slurry again after stirring.
Embodiment 6
Adopt dispersion agent 1 and the dispersion agent 2 of embodiment 5.
In 100 liters steel basin, add 40 premium on currency, open stirring, add 65kg200 purpose phosphoric acid production by-product gypsum powder, add 330g dispersion agent 1, with being pumped into two placed in-line sand mills of 20 liters, slurry behind the sand milling carries out analytical test with the laser light scattering particle size analyzer, record granularity 86% less than 2 μ m, with pump with slurry send into another 100 liters of steel basins in, add 420g dispersion agent 2 then and stirred 1.5 hours, slurry solid content 61.5% records slurry viscosity 250 centipoises.
Is in 300 the whizzer centrifugal 3 hours with slurry at separation factor, and the bottom sediment is 2.0% (weight), and can be evenly dispersed in the slurry again after stirring.
Embodiment 7
Adopt dispersion agent 1 and the dispersion agent 2 of embodiment 5.
In 100 liters steel basin, add 38 premium on currency, open stirring, add 70kg200 purpose semi-hydrated gypsum powder, add 350g dispersion agent 1, with being pumped into two placed in-line sand mills of 20 liters, slurry behind the sand milling carries out analytical test with the laser light scattering particle size analyzer, record granularity 92% less than 2 μ m, with pump with slurry send into another 100 liters of steel basins in, add 520g dispersion agent 2 then and stirred 1 hour, slurry solid content 64% records slurry viscosity 210 centipoises.
Is in 300 the whizzer centrifugal 3 hours with slurry at separation factor, and the bottom sediment is 2.3% (weight), and can be evenly dispersed in the slurry again after stirring.
Embodiment 8
Adopt dispersion agent 1 and the dispersion agent 2 of embodiment 5.
In 100 liters steel basin, add 42 premium on currency, open stirring, add 78kg200 purpose anhydrite powder, add 280g dispersion agent 1, with being pumped into two placed in-line sand mills of 20 liters, slurry behind the sand milling carries out analytical test with the laser light scattering particle size analyzer, record granularity 83% less than 2 μ m, with pump with slurry send into another 100 liters of steel basins in, add 420g dispersion agent 2 then and stirred 2.5 hours, slurry solid content 63.8% records slurry viscosity 230 centipoises.
Is in 300 the whizzer centrifugal 3 hours with slurry at separation factor, and the bottom sediment is 1.6% (weight), and can be evenly dispersed in the slurry again after stirring.
Claims (5)
1. a high solid content gypsum sizing material is characterized in that, component and weight content comprise:
Terra alba 30-80%
Dispersion agent 1 0.1-5%
Dispersion agent 2 0.1-5%
Water surplus
Said dispersion agent 1 is preparation like this:
(1) mixture heating up to the temperature with 100～150 weight parts waters and 1 weight part initiator is 60～85 ℃;
(2) mix monomer B and mix monomer A are added dropwise in the mixture of step (1) simultaneously;
(3) be warming up to 80～95 ℃, be incubated 30～60 minutes, obtain dispersion agent 1;
Said initiator is selected from a kind of or its mixture in ammonium persulphate, Sodium Persulfate, Potassium Persulphate, hydrogen peroxide, hydrogen peroxide butyl, di-tert-butyl peroxide, peroxidation two formyls, the Diisopropyl azodicarboxylate;
The component of said mix monomer A and parts by weight are:
Methacrylic acid 1-5 part
Vinylformic acid 10-50 part
Methyl methacrylate 5-30 part
Butyl methacrylate 2-15 part
The component of said mix monomer B and parts by weight are:
Acrylamide 0.5-10 part
Vinyl cyanide 1-15 part
Deionized water 20-80 part
Initiator 0.1-1.5 part;
With 1 part of initiator is benchmark, control mix monomer A rate of addition is 8.9 parts/hour, the rate of addition of mix monomer B is 15.6 parts/hour, or control mix monomer A rate of addition is 5.13 parts/hour, the rate of addition of mix monomer B is 5.67 parts/hour, and mix monomer A and mix monomer B are dripped simultaneously;
Said dispersion agent 2 is preparations like this:
(1) water of 150～200 weight parts and the initiator of 1 weight part are heated to 60～85 ℃
(2) then mix monomer C and mix monomer D are added dropwise in the mixture of step (1) simultaneously, mix monomer C and mix monomer D drip simultaneously;
(3) be warming up to 80～95 ℃, be incubated 30～120 minutes, obtain dispersion agent 2;
The component of said mix monomer C and parts by weight are:
Methacrylic acid 1-5 part
Vinylformic acid 25-35 part
Vinyl cyanide 3-10 part
Methylpropene sodium sulfonate 20-35 part
Sodium styrene sulfonate 15-20 part
Acrylamide 1-10 part
Deionized water 100-150 part
Initiator 0.1-2.5 part
The component of said mix monomer D and parts by weight are:
Methyl methacrylate 30-50 part
Butyl methacrylate 20-30 part
Said initiator is selected from a kind of or its mixture in ammonium persulphate, Sodium Persulfate, Potassium Persulphate, hydrogen peroxide, hydrogen peroxide butyl, di-tert-butyl peroxide, peroxidation two formyls, the Diisopropyl azodicarboxylate;
With 1 part of initiator is benchmark, the rate of addition of mix monomer C be 15～50 weight parts/hour, the rate of addition of mix monomer D be 5.0～15 weight parts/hour.
2. high solid content gypsum sizing material according to claim 1 is characterized in that, the gypsum particle granularity accounts for more than 30% of total number of particles for the particle less than 2 μ m, and slurry viscosity is the 10-1000 centipoise.
3. high solid content gypsum sizing material according to claim 1 is characterized in that, said terra alba is selected from a kind of or its mixture in dihydrate gypsum, semi-hydrated gypsum or the anhydrite.
4. the method for preparing the described high solid content gypsum sizing material of claim 1, it is characterized in that, comprise the steps: to adopt the described material rate of claim 1, terra alba and water are mixed together, add dispersion agent 1 during mixing, grind then, the particle diameter that is ground to terra alba accounts for more than 30% of total number of particles less than the particle of 2 μ m, add dispersion agent 2 then, stir then, promptly obtain gypsum slurry of the present invention.
5. method according to claim 4, it is characterized in that, terra alba and water are mixed together, add dispersion agent 1 during mixing, ground then 1～5 hour, the particle diameter that is ground to terra alba accounts for more than 30% of total number of particles less than the particle of 2 μ m, adds dispersion agent 2 then, stirred then 0.5～3 hour, and promptly obtained gypsum slurry of the present invention.
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| CNB2005100310418A CN100335437C (en) | 2005-10-21 | 2005-10-21 | High solid content gypsum sizing material and preparing process thereof |
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| CNB2005100310418A CN100335437C (en) | 2005-10-21 | 2005-10-21 | High solid content gypsum sizing material and preparing process thereof |
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| CN100335437C true CN100335437C (en) | 2007-09-05 |
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| CN100509683C (en) | 2006-09-30 | 2009-07-08 | 江苏博特新材料有限公司 | Low molecular weight copolymer dispersant and preparing method thereof |
| MX2013003175A (en) * | 2010-10-11 | 2013-04-24 | Basf Constr Polymers Gmbh | Dispersant containing gypsum slurry. |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5286412A (en) * | 1991-10-16 | 1994-02-15 | Georgia-Pacific Corporation | Modified lignosulfonate dispersant for gypsum |
| US6852159B2 (en) * | 2002-12-16 | 2005-02-08 | Takemoto Yushi Kabushiki Kaisha | Gypsum slurry compositions |
-
2005
- 2005-10-21 CN CNB2005100310418A patent/CN100335437C/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5286412A (en) * | 1991-10-16 | 1994-02-15 | Georgia-Pacific Corporation | Modified lignosulfonate dispersant for gypsum |
| US6852159B2 (en) * | 2002-12-16 | 2005-02-08 | Takemoto Yushi Kabushiki Kaisha | Gypsum slurry compositions |
Non-Patent Citations (1)
| Title |
|---|
| Vinnapas 可再分散乳胶粉对石膏基灰泥的改性作用 科博尔，化学建材，第6期 1999 * |
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