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Paper filled with rosette-type precipitated calcium carbonate

A light calcium carbonate, petal-shaped technology, used in calcium carbonate/strontium/barium, papermaking, textiles and papermaking, etc., can solve the problems of poor strength and easy to grow

Pending Publication Date: 2016-11-16
NIPPON PAPER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] When the acicular or columnar calcium carbonate described in Patent Document 1 exists in the form of primary particles, it has the following disadvantages: according to the characteristics of its shape, it is easy to be oriented on the surface of the coating layer and in the coating layer, and the MD (papermaking) of the paper Flow direction), CD (papermaking width direction) direction strength difference tends to become large

Method used

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  • Paper filled with rosette-type precipitated calcium carbonate
  • Paper filled with rosette-type precipitated calcium carbonate
  • Paper filled with rosette-type precipitated calcium carbonate

Examples

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Embodiment

[0075] Hereinafter, although an Example is given and this invention is demonstrated concretely, it goes without saying that this invention is not limited to these. In addition, in this specification, unless otherwise specified, "%" is "% by weight", and the numerical range includes the endpoint.

[0076] Evaluation method

[0077] Each item was evaluated by the following evaluation method.

[0078] (1) Average particle diameter: using a laser diffraction / scattering particle size distribution analyzer (manufactured by Malvern, Mastersizer 2000), the 50% point (D50) of the volume cumulative distribution was defined as the average particle diameter.

[0079] (2) Measured in accordance with BET specific surface area: JIS Z 8830-2001.

[0080] (3) Basis weight: measured in accordance with JIS P 8124.

[0081] (4) Paper thickness: Measured in accordance with JIS P 8118.

[0082] (5) Density: Calculated from basis weight and paper thickness according to JIS P 8118.

[0083] (6) ...

reference example 1

[0097] As a reference example, paper was produced using calcium carbonate (calcium carbonate 4: smaller in specific surface area than rosette-shaped calcium carbonate of the same particle size) in which needle-shaped primary particles aggregated to form secondary particles. 0.8% of cationized starch, 0.5% of aluminum sulfate, and 0.1% of alkyl ketene dimer were sequentially added to the pulp absolute dry weight while stirring a slurry of 100% hardwood bleached kraft pulp adjusted to a Canadian standard freeness of 450 mL. , adding light calcium carbonate 4 (average particle size 7.0 μm, BET specific surface area 7.9m 2 / g). After diluting the pulp slurry, add 0.1% retention enhancer relative to the absolute dry weight of the pulp to make paper stock, and use a square sheet former for hand-sheeting to obtain a basis weight of 60g / m 2 of paper. After pressing, it was dried at 110° C. with a drum dryer, and processed so that the paper thickness was 90 μm with a manual cold cale...

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Abstract

The problem addressed by the present invention is to provide a paper that, even in cases when a large amount of internal filler has been admixed, papermaking chemicals easily have an effect, and a decrease in strength is suppressed. The present invention provides a paper filled with rosette-type precipitated calcium carbonate of which the primary grains are clumped in a radial shape, and of the rosette-type precipitated calcium carbonate, the BET specific surface area is 1.0-8.0 m2 / g, and the average particle size (D50) is 3.0-15.0 [mu]m.

Description

technical field [0001] The present invention relates to a paper filled with valve-shaped light calcium carbonate (Rozetta-type calcium carbonate). Background technique [0002] In general, paper is filled with inorganic substances as fillers in cellulose-based fibrous materials. The fillers are added to improve optical properties, mainly whiteness, and opacity, which tend to be insufficient when only cellulose-based fibrous materials are used. In recent years, in order to increase environmental awareness and reduce production costs, attempts are being made to reduce the amount of cellulose-based fibrous substances made from wood and instead increase the filler rate in paper. However, when the filler is added, the optical properties are improved, and on the other hand, the tensile strength, tear strength, Stockigt sizing degree, etc. are reduced. Usually, in order to compensate for the reduced strength characteristics and sizing properties, agents such as paper strength enha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/67
CPCD21H17/675C01F11/18C01P2004/61C01P2006/12
Inventor 竹崎友纪子山田喜威小川祥永原大平原知香
Owner NIPPON PAPER IND CO LTD
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