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Paper-making pulping method by using kenaf aggregate

A technology of aggregates and kenaf, applied in the field of papermaking, can solve the problems of lack of kenaf aggregates pulping and papermaking methods, lack of kenaf aggregates, etc.

Active Publication Date: 2011-04-20
SHANGHAI ZHONGWEI BIOCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a lack of pulping or papermaking processes suitable for kenaf aggregates, and there is still a lack of satisfactory, high-efficiency, low-energy consumption and environmentally friendly pulping and papermaking methods for kenaf aggregates.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Raw materials: Cut kenaf aggregates with a length of about 3-5 cm and a diameter of about 2-3 cm, and the dosage is about 5 kg.

[0074] Pretreatment: Put the kenaf aggregate in hot water at 85°C for about 25 minutes, cool it naturally to below 50°C, and then squeeze the kenaf aggregate.

[0075] Chemical treatment: sodium hydroxide dosage 3.0%; hydrogen peroxide dosage 5.0%; EDTA 0.4%; sodium dodecylsulfonate 0.02%; MgSO 4 0.15%; anhydrous sodium silicate (Na 2 SiO 3 ) is 1.0%; the pH value is 10.5-11; the solid-liquid ratio is 1:7; the temperature is 80°C and the time is 150min.

[0076] Refining: using 1.5mm, 0.5mm, 0.15mm, 0.1mm four-stage grinding. During the refining process, the freeness of the pulp is controlled at 150-450ml.

[0077] Depotentialization: depotentialization at 90°C for 4 hours to obtain pulp of kenaf aggregate.

[0078] The paper samples made by using the pulp on the Rapid-Kothen paper sheet automatic forming machine are as follows after te...

Embodiment 2

[0081] The method is the same as in Example 1, except that pretreatment, chemical treatment and refining conditions are different.

[0082] Pretreatment: Put the kenaf aggregate in hot water at 90°C for about 20 minutes, add cold water to cool to about 45°C, and then squeeze the kenaf aggregate.

[0083] Chemical treatment: sodium hydroxide dosage 5.0%; hydrogen peroxide dosage 3.0%; EDTA 0.5%; MgSO 4 0.5%; Na 2 SiO 3 2.0%; PH value is 10.5 ~ 11; when the ratio of solid to liquid is 1:7; the temperature is 90°C and the time is 90min.

[0084] Refining: use 1.5mm, 0.5mm, 01mm three-stage mill.

[0085] Depotentialization at 90°C for 4 hours to obtain pulp of kenaf aggregate.

[0086] The paper samples made by using the pulp on the Rapid-Kothen paper sheet automatic forming machine are as follows after testing:

[0087] Freeness

Embodiment 3

[0089] The method is the same as in Example 1, except that the pretreatment, chemical treatment, refining and dehydration conditions are different.

[0090] Pretreatment: put the kenaf aggregate in hot water at 95°C for about 20 minutes, add cold water to cool to about 45°C, and then squeeze the kenaf aggregate.

[0091] Chemical treatment: 7.0% sodium hydroxide; 2.0% hydrogen peroxide; 0.15% EDTA, MgSO 4 0.5%; Na 2 SiO 3 0.05%; sodium dodecyl sulfonate 0-0.12%; PH value 10.5-11; solid-liquid ratio 1:8; temperature 95°C and time 90min.

[0092] Refining: use 0.3mm, 0.15mm, 0.06mm three-stage grinding.

[0093] Depotentialization: Depotentialization at 70°C for 30 minutes at a rotational speed of 200r / min to obtain pulp of kenaf aggregates.

[0094] The paper samples made by using the pulp on the Rapid-Kothen paper sheet automatic forming machine are as follows after testing:

[0095] pulp yield

[0096] Bulk

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Abstract

The present invention relates to a paper-making pulping method by using kenaf aggregates. Concretely, the present invention provides a paper-making pulping method by using kenaf aggregates which comprises the following steps: (a) soaking the kenaf aggregates in water or an aqueous solvent at a temperature of 70-100 DEG C for 5-180 min, cooling the soaked kenaf aggregates to the temperature of 5-50 DEG C, and pulverizing to obtain the pulverized kenaf aggregates; (b) soaking the kenaf aggregates obtained through step (a) at a temperature of 70-90 DEG C for 60-300 min with the presence of 2.0-7.0 wt% of sodium hydroxide, 2.0-5.0 wt% of hydrogen peroxide, 0.05-3.0 wt% of sodium silicate, and 0.05-2.0 wt% of magnesium sulfate; (c) performing the refining and latency procedure to the chemically treated pulp so as to obtain kenaf aggregate paper pulp.

Description

technical field [0001] The invention relates to the field of papermaking, in particular to a papermaking and pulping method of kenaf aggregates. Background technique [0002] The demand for paper in China is increasing by 10% year by year. Due to the serious shortage of forest resources in our country. Forest coverage is only 2 / 3 of the global average. Therefore, there is an urgent need to develop non-wood fiber raw materials to replace wood fibers. [0003] Shanghai Zhongwei Biochemical Co., Ltd. applied soil conditioner technology to plant kenaf on salinized and desertified land. Substituting kenaf for trees, since the biomass of kenaf is 3-4 times that of trees, planting kenaf to absorb carbon dioxide has become one of human strategies to prevent global warming; at the same time, it improves the soil and prevents further invasion of desertification and salinization. [0004] At present, the utilization of kenaf mainly includes the direct use of kenaf as raw material t...

Claims

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Application Information

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IPC IPC(8): D21H11/12D21C3/00
Inventor 张士楚王恒新
Owner SHANGHAI ZHONGWEI BIOCHEM
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