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Method for preparing high-whiteness chemical pulp and paper products thereof by using corn stalk

A manufacturing method and technology of corn stalks, applied in pulping with inorganic alkali, pulp beating method, chemical/chemical mechanical pulping, etc., can solve the problems of difficult removal of metal ions and colored substances, yellowing of pulp, and difficult bleaching of pulp, etc. question

Inactive Publication Date: 2008-07-23
TIANJIN HUAJUN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this pulping method are: the raw materials used are limited to the raw materials of depilled corn stalks; the pulp obtained by cooking with ammonium method is not easy to be bleached; EOT When bleaching, due to the high amount of alkali used (6% to 10%), although this is beneficial to delignification, it will also cause the pulp to turn yellow.
The bleaching temperature used is low (55-95°C), and it is not easy to improve the whiteness of pulp
In addition, because there is no acid treatment section in the bleaching program, the bleaching is always carried out under alkaline conditions, and it is not easy to remove metal ions and colored substances

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] A method for producing high-whiteness chemical pulp and its paper products from corn stalks. The corn stalks include pith-removed and non-pithinized corn stalk husks and whole corn stalks. The pulping method , including cooking and bleaching methods, wherein: (one), the cooking method is a cooking method that adopts the caustic soda method adding anthraquinone and a surfactant; (two), the bleaching method is to use O P AP O Short-program total chlorine-free bleaching method;

[0084] (1), cooking method, adopt the cooking method of the caustic soda method that adds anthraquinone and tensio-active agent, and its cooking process is:

[0085] 1) Cut the air-dried and depilled corn stalks into pieces with a length of 3 to 4 cm, remove dust, leaves and debris, put them into a 15-liter electric heating rotary cooking pot, add cooking liquid, Cover the pot and let it steam. The cooking adopts the caustic soda method adding anthraquinone and surfactant, and the cooking medic...

Embodiment 2

[0125] Example 2 was repeated according to the method steps and process conditions described in Example 1, except that the raw material used was whole corn stalks. The coarse pulp yield of unbleached corn stalk whole stalk pulp obtained by cooking is 43.68%, the fine pulp yield is 42.15%, the sieve rate is 0.25%, and the residual alkali is 2.13g.L -1 , pulp Kappa value 18.6.

[0126] by O p The Kappa value of the corn stalk whole stalk pulp after section treatment is 4.5, and the viscosity is 1075ml.g -1 , pulp yield 91.63%. by P o The bleached cornstalk whole stalk pulp has a brightness of 85.10% ISO and a viscosity of 746ml.g -1 .

[0127] The physical properties of the pulp sheet made from the above-mentioned corn stalk whole stalk pulp are: tightness 0.671g.cm -3 , fracture length 5.67km, tear index 5.80mN.m 2 .g -1 , burst index 2.54kPa.m 2 .g -1 , The folding resistance is 156 times.

Embodiment 3

[0129] The high-whiteness corn stalk husk pulp and corn stalk whole stalk pulp prepared according to the methods of Example 1 and Example 2 were used alone or combined with bleached softwood kraft pulp to make handsheets and machine-made paper.

[0130] The above-mentioned high-brightness corn stalk skin pulp, corn stalk whole stalk pulp and bleached coniferous wood kraft pulp were beaten with a laboratory Valley beater respectively, with a pulp loading of 400 g (calculated as dry pulp), and a beating concentration of 2%. The beating degree of pulping is 35°SR. According to the different pulp ratios listed in Table 1, handsheets were made on the laboratory sheet former; according to the different pulp ratios listed in Table 2, high-grade writing paper and electrostatic copy paper were made on the laboratory fourdrinier paper machine. In order to improve the performance of paper, chemical additives are added to the pulp. The chemical additives used and their dosage are as follo...

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Abstract

The invention discloses a preparation method of chemical pulp with high whiteness by corn stalks and paper product, wherein steaming adopts soda cooking by adding anthraquinones and surface-active material; bleaching adopts totally-chlorine-free bleaching of short program of OPAPO in the pulp making processes, wherein OP segment is oxygenic delignification segment reinforced by small amount of hydrogen peroxide; A segment is acid treatment segment; PO> is oxygen-reinforced hydrogen peroxide bleaching segment. The preparation method of chemical pulp with high whiteness by corn stalks and paper product has the advantages of less steaming time, high steaming and bleaching efficiency, free of chlorine and chlorine compounds while bleaching, high whiteness and strength of the paper pulp, energy saving, water saving, low production cost, and favorableness to environmental protection. In addition, with whiteness rate of above 85% ISO, the paper pulp made from corn stalks is able to be made into high-grade cultural paper and paperboard as well as paper and paperboard with high sanitary indexes replacing bleached hardwood pulp or bleached hardwood pulp mixed with bleached softwood kraft pulp.

Description

technical field [0001] The invention belongs to the technical field of non-wood fiber pulping and papermaking, and relates to a method for pulping and papermaking from corn stalks, in particular to a method for preparing high-whiteness chemical pulp and its paper products from corn stalks. Background technique [0002] China is a large agricultural country, and corn is one of the main crops. There are about 150 million tons of corn stalks in the country every year. According to statistics, 40% of this straw is used by farmers as living fuel and livestock feed, and the remaining 60% is discarded or burned on the spot, which not only causes serious environmental pollution, but also causes a great waste of resources. [0003] For a long time, in order to solve the shortage of wood fiber raw materials for papermaking, my country's paper industry has actively carried out the research and development of some non-wood fiber raw materials for pulp and paper instead of wood fiber raw...

Claims

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Application Information

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IPC IPC(8): D21H11/12D21C3/02D21C9/16D21B1/06D21C7/00D21C9/00D21C9/147D21H11/02D21D1/02D21H17/67D21H21/32D21H21/18D21H17/29D21H21/16D21H21/10
CPCD21C1/06D21C3/02D21C5/00D21C9/163D21H11/12
Inventor 马志军胡惠仁徐立新王立群张宏旭
Owner TIANJIN HUAJUN SCI & TECH
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