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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0082] Example 1

[0083] A method for producing high-whiteness chemical pulp and paper products thereof from corn stalks. The corn stalks include depited and unpitched corn stalk husks and corn stalk whole stalks, and the pulping method , including cooking and bleaching methods, wherein: (1), the cooking method adopts the cooking method of the caustic soda method of adding anthraquinone and surfactant; (2), the bleaching method adopts O P AP O Short-program fully chlorine-free bleaching method;

[0084] (1), cooking method, adopts the cooking method of the caustic soda method of adding anthraquinone and surfactant, and its cooking process is:

[0085] 1), cut the air-dried corn stalk husks after depiting into pieces with a length of 3 to 4 cm, remove dust, leaves and scraps, put them into a 15-liter electric heating rotary cooking pot, add cooking liquid, Cover the pot and cook. The cooking adopts the caustic soda method with the addition of anthraquinone and surfactant, ...

Example Embodiment

[0124] Example 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 the whole corn stalk. The unbleached corn stalk whole stalk pulp obtained by cooking has a coarse pulp yield of 43.68%, a fine pulp yield of 42.15%, a screen residue rate of 0.25%, and a residual alkali of 2.13 g.L -1 , the pulp Kappa value is 18.6.

[0126] via O p The Kappa value of corn stalk whole stalk pulp after segment treatment is 4.5, and the viscosity is 1075ml.g -1 , the pulp yield was 91.63%. via P o Stage bleached cornstalk whole stalk pulp had 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 , the fracture length is 5.67km, and the tear index is 5.80mN.m 2 .g -1 , burst index 2.54kPa.m 2 .g -1 , folding endurance 156 times.

Example Embodiment

[0128] Example 3

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

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

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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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