CN101250335B - Highly-reserved heavy calcium as well as preparation method and application thereof - Google Patents
Highly-reserved heavy calcium as well as preparation method and application thereof Download PDFInfo
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- CN101250335B CN101250335B CN200810035265XA CN200810035265A CN101250335B CN 101250335 B CN101250335 B CN 101250335B CN 200810035265X A CN200810035265X A CN 200810035265XA CN 200810035265 A CN200810035265 A CN 200810035265A CN 101250335 B CN101250335 B CN 101250335B
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Abstract
The invention provides high retention heavy calcium, and a preparation process and the application thereof. The preparation process comprises the following steps, adding heavy calcium carbonate into water, and adding dispersant poly-sodium acrylate to make into heavy calcium carbonate paste, conducting ultrafine grinding for heavy calcium carbonate paste which is obtained with a wet-type ultra-fine stripping machine, adding stannous chloride in ultrafine heavy calcium carbonate paste to agitate, thereby obtaining high reservation heavy calcium paste. The high retention heavy calcium of the invention can be used as papermaking filling, can increase first-stroke retention rate of filling and total retention rate, simultaneously increases the retention rate of fiber, is beneficial for reducing white water concentration, reduces filling usage quantity and wood slurry usage quantity, and is beneficial for reducing cost and protecting environment.
Description
Technical field
The present invention relates to a kind of high reservation coarse whiting and preparation method thereof and as the application of papermaking filler.
Background technology
The adding filler can improve paper in the papermaking opaqueness and brightness improve smoothness of paper and uniform state, increase the flexibility of paper, reduce the water absorbability and the deformation extent of paper, also help simultaneously to reduce production costs.And lime carbonate is cheap owing to it, and can improve the opaqueness of paper, the oil suction performance of ink of increase paper equally, has certain cost advantage as papermaking filler.Along with acid papermaking changes to neutral papermaking, water-ground limestone becomes the important raw and processed materials that Chinese paper industry improves paper quality, reduces the papermaking cost day by day.The market price of wood pulp is 6000 yuans per ton at present, and the market price of filler only is 500 yuans per ton, the ratio of filler is about 10%-20% in the paper, if the ratio of filler is brought up to 20-30% by 10%-20%, and ton paper cost decline 400-500 unit then.But the water-ground limestone retention rate is low, has increased production cost and to the difficulty of White Water Treatment.
Chinese patent CN100999331 discloses a kind of preparation method of high retention heavy calcium carbonate.This method is to add cats product in heavy calcium carbonate slurry at twice, after tensio-active agent adds for the first time, positively charged ion one end that tensio-active agent polarity is very strong and the negatively charged ion generation effect on water-ground limestone surface, SURFACTANT ADSORPTION is to the water-ground limestone particle surface, the long-chain hydrocarbon that the other end polarity is very weak covers the water-ground limestone particle surface, makes the water-ground limestone particle surface become low-pole.After tensio-active agent adds for the second time, tensio-active agent low-pole long-chain hydrocarbon can with the water-ground limestone particle surface generation effect of low-pole, the positively charged ion retention heavy calcium carbonate particulate surface that the other end polarity is very strong, make the original electronegative water-ground limestone particle surface lotus that becomes positively charged, make water-ground limestone become the positively charged ion coarse whiting.The positively charged positively charged ion coarse whiting in this surface joins in the paper pulp, the positive charge of water-ground limestone particle surface can with pulp fiber surface with negative charge produce the intensive effect, make the water-ground limestone particle be adsorbed on pulp fiber surface firmly, thereby improve the retention rate of filler.
But, because tensio-active agent one end is the very weak long-chain hydrocarbon of polarity, can reduce the polarity of water-ground limestone particle surface, make water-ground limestone particle and pulp fiber surface reaction force attenuation, paper strength is descended.
Summary of the invention
An object of the present invention is to provide a kind of high reservation coarse whiting and its production and application, to overcome the above-mentioned defective that prior art exists.
Method of the present invention comprises the steps:
Heavy calcium carbonate is added in the entry, and Xiang Shuizhong adding dispersion agent sodium polyacrylate, be made into heavy calcium carbonate slurry;
Adopt the ultra-fine machine of delaminating of wet type that the heavy calcium carbonate slurry that obtains is carried out ultra-fine mill, make the superfine heavy calcium carbonate slurry, wherein diameter is 30～90% less than the granular mass content of 2 μ m;
In the superfine heavy calcium carbonate slurry, add tin protochloride, stirred 0.5～3.0 hour, obtain the high coarse whiting slurry that keeps.
Described heavy calcium carbonate is for passing through the meal of precomminution, and fineness is generally 200～600 orders;
The add-on of described dispersion agent sodium polyacrylate is 0.2～1.5% of a heavy calcium carbonate quality, preferably 0.5～1.0%;
It is 30～75% slurry that described heavy calcium carbonate slurry can be made into the quality solid content according to actual needs, from cost with use and consider, preferably is made into 50～75% slurry;
The add-on of tin protochloride is 0.2～1.5% of a heavy calcium carbonate quality.
Described high reservation coarse whiting can be above-mentioned slurry form, also can further dewater and make cake form, or dry powder form is made in described filtration cakes torrefaction, pulverizing.
Wet type is ultra-fine, and the step required equipmenies such as machine and dehydration, drying, pulverizing of delaminating are this area general-purpose equipment.
The high coarse whiting that keeps can improve filler initial journey retention rate and total retention rate as papermaking filler, also can improve the fiber retention rate simultaneously, helps reducing white water consistency, reduces amount of filler and wood pulp consumption, helps reducing cost and helping environment protection.
The present invention adds tin protochloride in the superfine heavy calcium carbonate slurry, not only can significantly improve the retention rate of coarse whiting filler, thereby improves the retention rate of paper pulp fiber, and paper strength does not descend simultaneously.This may be because hydrolysis takes place in water tin protochloride, hydrolysate is the tindihydroxide of positively charged, the negative charge on the tindihydroxide of positively charged and water-ground limestone surface attracts each other, make the tindihydroxide of positively charged be adsorbed onto the water-ground limestone particle surface, make the original electronegative water-ground limestone particle surface lotus that becomes positively charged.The positively charged coarse whiting in this surface joins in the paper pulp, the positive charge of water-ground limestone particle surface can with pulp fiber surface with negative charge produce the intensive effect, make the water-ground limestone particle be adsorbed on pulp fiber surface firmly, thereby improve the retention rate of filler, since pulp fiber surface with negative charge be lowered, also improve simultaneously the retention rate of paper pulp fiber.Simultaneously, because the present invention adopts the tindihydroxide of positively charged to be adsorbed onto the water-ground limestone particle surface, can not change the polarity of water-ground limestone particle surface, so can not reduce water-ground limestone particle and pulp fiber surface reactive force, paper strength can not descend.
Embodiment
Embodiment 1
2.5 ton of 200 order heavy calcium carbonate joined in 6.0 tons of deionized waters, slurry is made in stirring, and in slurry, add 6.5kg sodium polyacrylate dispersion agent, stir, with pump slurry is sent into 300 liters of machines of delaminating then, with the machine of delaminating water-ground limestone is ground, make the superfine heavy calcium carbonate slurry, wherein diameter is 90% less than the granular mass content of 2 μ m.
Add 5kg solid tin protochloride then in the superfine heavy calcium carbonate slurry, stirred 2 hours, obtain the high coarse whiting slurry that keeps, slurry can directly be used as papermaking filler.
Embodiment 2
2.5 ton of 400 order heavy calcium carbonate joined in 3 tons of deionized waters, slurry is made in stirring, and in slurry, add 12kg sodium polyacrylate dispersion agent, stir, with pump slurry is sent into 300 liters of machines of delaminating then, with the machine of delaminating water-ground limestone is ground, make the superfine heavy calcium carbonate slurry, wherein diameter is 75% less than the granular mass content of 2 μ m.Add 32kg solid tin protochloride then in the superfine heavy calcium carbonate slurry, stirred 2 hours, obtain the high coarse whiting slurry that keeps, it is 3.4 tons of 71% filter cakes that slurry is made solid content through filtration, can directly be used as papermaking filler.
Embodiment 3
2.5 ton of 600 order heavy calcium carbonate joined in 1.1 tons of deionized waters, slurry is made in stirring, and in slurry, add 35.5kg sodium polyacrylate dispersion agent, stir, with pump slurry is sent into 80 liters of machines of delaminating then, with the machine of delaminating water-ground limestone is ground, make the superfine heavy calcium carbonate slurry, wherein diameter is 30% less than the granular mass content of 2 μ m.In the superfine heavy calcium carbonate slurry, add 35kg solid tin protochloride then, stirred 2.5 hours, obtain the high coarse whiting slurry that keeps.To make solid content be 4.1 tons of 60% filter cakes to slurry through filtering, and through 105 ℃ of dryings 3 hours, pulverizes through beater grinder again, obtains high 2.41 tons of the coarse whiting powders that keep, and can be used as papermaking filler.
Embodiment 4
2.5 ton of 200 order heavy calcium carbonate joined in 5 tons of deionized waters, slurry is made in stirring, and in slurry, add 16kg sodium polyacrylate dispersion agent, stir, with pump slurry is sent into 300 liters of machines of delaminating then, with the machine of delaminating water-ground limestone is ground, make the superfine heavy calcium carbonate slurry, wherein diameter is 40% less than the granular mass content of 2 μ m.Add 18kg solid tin protochloride then in the superfine heavy calcium carbonate slurry, stirred 3 hours, obtain the high coarse whiting slurry that keeps, slurry can directly be used as papermaking filler.
Embodiment 5
2.5 ton of 300 order heavy calcium carbonate joined in 2.5 tons of deionized waters, slurry is made in stirring, and in slurry, add 20kg sodium polyacrylate dispersion agent, stir, with pump slurry is sent into 300 liters of machines of delaminating then, with the machine of delaminating water-ground limestone is ground, the superfine heavy calcium carbonate slurry, wherein diameter is 50% less than the granular mass content of 2 μ m.In the superfine heavy calcium carbonate slurry, add 14kg solid tin protochloride then, stirred 0.5 hour, obtain the high coarse whiting slurry that keeps.To make solid content be 3.8 tons of 64% filter cakes to slurry through filtering, and through 112 ℃ of dryings 2 hours, pulverizes through beater grinder again, obtains high 2.43 tons of the coarse whiting powders that keep, and can be used as papermaking filler.
Application Example
With 1880 fourdrinier wire multi-cylinder culture papers, replace common coarse whiting to be used for double gummed paper production with the high coarse whiting filler that keeps of same fineness, investigate the manufacture paper with pulp influence of process of papermaking, the variation of white water consistency, machine water concentration, initial journey retention rate.Press GB/T 453-2002 and detect pattern intensity.As table 1.
Experiment condition:
Paper machine type, 1880 fourdrinier wire multi-cylinder culture papers;
Produce the paper kind, the 70g/m2 double gummed paper;
Filler, the high coarse whiting that keeps; Common coarse whiting
Table 1
The contrast sample keeps coarse whiting for the height that adopts the preparation of patent CN100999331 disclosed method.Compare with the contrast sample, the present invention's high reservation coarse whiting white water consistency and machine water concentration ratio contrast sample are lower slightly, initial journey retention, filler retention, the comparison of fiber retention rate are omited high than sample, but the tensile strength comparison is more much higher than sample, embody thus, the present invention can't have influence on strength of paper because of the additive that adds when improving the coarse whiting retention rate.
Claims (8)
1. the preparation method of a high reservation coarse whiting is characterized in that, comprises the steps:
Heavy calcium carbonate is added in the entry, and Xiang Shuizhong adding dispersion agent sodium polyacrylate, be made into heavy calcium carbonate slurry;
Adopt the ultra-fine machine of delaminating of wet type that the heavy calcium carbonate slurry that obtains is carried out ultra-fine mill, make the superfine heavy calcium carbonate slurry;
In the superfine heavy calcium carbonate slurry, add tin protochloride, stir, obtain the high coarse whiting slurry that keeps;
The add-on of tin protochloride is 0.2～1.5% of a heavy calcium carbonate quality.
2. method according to claim 1 is characterized in that, the fineness of described heavy calcium carbonate is 200～600 orders.
3. method according to claim 1 is characterized in that, in the superfine heavy calcium carbonate slurry that makes, diameter is 30～90% less than the granular mass content of 2 μ m.
4. method according to claim 1 is characterized in that, the add-on of described dispersion agent sodium polyacrylate is 0.2～1.5% of a heavy calcium carbonate quality.
5. method according to claim 1 is characterized in that, it is 30～75% slurry that described heavy calcium carbonate slurry is made into the quality solid content.
6. according to each described method of claim 1～5, it is characterized in that the height that obtains keeps the coarse whiting de-watering of slurries and makes filter cake, or dry powder is made in described filtration cakes torrefaction, pulverizing.
7. the height according to each described method preparation of claim 1～6 keeps coarse whiting.
8. the described high application that keeps coarse whiting of claim 7 is characterized in that, as papermaking filler.
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| CN200810035265XA CN101250335B (en) | 2008-03-27 | 2008-03-27 | Highly-reserved heavy calcium as well as preparation method and application thereof |
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| CN200810035265XA CN101250335B (en) | 2008-03-27 | 2008-03-27 | Highly-reserved heavy calcium as well as preparation method and application thereof |
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| CN101250335B true CN101250335B (en) | 2010-08-18 |
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Denomination of invention: Highly-reserved heavy calcium as well as preparation method and application thereof Effective date of registration: 20191225 Granted publication date: 20100818 Pledgee: Bank of Hangzhou, Limited by Share Ltd, Shanghai branch Pledgor: Shanghai Dongsheng New Materials Co., Ltd. Registration number: Y2019310000035 |
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Date of cancellation: 20210813 Granted publication date: 20100818 Pledgee: Bank of Hangzhou Limited by Share Ltd. Shanghai branch Pledgor: SHANDONG DONGSHENG NEW MATERIAL Co.,Ltd. Registration number: Y2019310000035 |