Preparation method of phyllostachys-pubescens naturally colored mechanical pulp

Abstract

The invention discloses a preparation method of phyllostachys-pubescens naturally colored mechanical pulp. Aiming at the characteristics that phyllostachys pubescens is thick in wall, hard in texture,high in hydrophobicity and difficult to permeate by a liquid medicine, the phyllostachys pubescens is shredded through a double-shaft shredder, and then is steeped in alkaline sulfite pre-steeping liquor, wherein pre-steeping conditions are that the use level of NaOH is 5g / L to 10g / L; the use level of Na2SO3 is 10g / L to 20g / L; a liquor ratio is 5 to 1; a steeping time is 5h to 10h; a temperatureis 20 to 40 DEG C. The double-shaft shredder can be used for enabling a bamboo material to generate more cracks, and is used for increasing the permeation capacity and accessibility of the liquid medicine; a bamboo sheet can be enabled to be sufficiently softened by a low-temperature, low-alkali-concentration and long-time steeping way; dissolved-out matters in the bamboo sheet are reduced; the yield of paper pulp is improved. The hydrophilicity of a phyllostachys-pubescens fiber can be increased by the addition of Na2SO3; the bamboo sheet is promoted to be softened; the strength of the paperpulp is improved, and the prepared phyllostachys-pubescens naturally colored mechanical pulp, when the freeness is 380mL, has the breaking length not less than 3,200m, the loose depth not less than 3.20cm<3> / g, the tearing strength not less than 10mN.m<2> / g and the yield not less than 88 percent.

Description

technical field [0001] The invention relates to a pulping method of non-wood raw materials, in particular to a preparation method of natural colored mechanical pulp of moso bamboo. Background technique [0002] Moso bamboo is a dual-use bamboo species with the largest distribution area among bamboo resources in my country and high economic value. The length of moso bamboo fiber is generally 1.23-2.71 mm, the width is generally 12.3-19.6 μm, and the aspect ratio is 110-200. It belongs to the long fiber range, and the fiber is slender and has good interweaving force. At present, moso bamboo is mainly used to produce daily necessities and handicrafts such as bamboo plywood, furniture panels, and mats. Due to the sluggishness of these processing industries and the oversupply of bamboo raw materials, the current price of moso bamboo has fallen to a low point. A large amount of moso bamboo suitable for harvesting has not been felled in time, resulting in a serious waste of resou...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of natural color mechanical pulp of moso bamboo, which solves the problems of difficulty in pulping natural color mechanical pulp of moso bamboo, low yield and poor pulp quality, and the natural color mechanical pulp of moso bamboo prepared by this process When the pulp freeness is 380 mL, the breaking length of the pulp is ≥3200 m; the bulk thickness is ≥3.20 cm 3 / g; tearing degree ≥ 10 mN m 2 / g, yield ≥ 88%