Method for preparing high-viscosity and high-etherification-degree sodium carboxymethyl cellulose from jute

A technology of sodium carboxymethyl cellulose and high etherification, applied in the chemical industry, can solve the problems of application fields and economic limitations, and achieve the effects of good fluidity, low viscoelasticity, and low dragging property

Inactive Publication Date: 2015-12-30
HANGZHOU HONGBO NEW MATERIALS +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method for preparing high-viscosity and high-etherification-degree sodium carboxymethyl cellulose from jute

Examples

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Embodiment 1

[0035] First, treat the juteine. The juteine ​​treatment agent is: 30g / L sodium hydroxide, 10g / L sodium sulfite, 3g / L penetrant JFC, the weight-to-liquid ratio is 1:18, and the temperature is kept at 100°C for 90min. After bleaching, the bleaching agent is: 20g / L peracetic acid, 5g / LLEDTA sodium salt, 3g / L penetrant JFC, 5g / L soda ash, bath ratio 1:18, 70℃ for 60min. After washing with water, dehydration, and drying in the second stage (the first stage is 60°C and the second stage is 105°C), the refined jute fluff cellulose is obtained.

[0036] Take 1.8kg of refined hemp wool, add it to the kneader, add 3kg of 93% ethanol, 2.04kg of 50% concentration of liquid caustic soda, and alkalize at 15°C for 60min.

[0037] Add 0.5kg of a mixed solution of 1.50kg of chlorinated acid and 94% ethanol to the kneader, control the temperature below 20°C, and then add 0.60kg of 50% concentration of liquid caustic soda. The temperature was increased in stages, from 20°C to 75°C, about 40 mi...

Embodiment 2

[0044] Juterine treatment agent: 15g / L sodium hydroxide, 5g / L sodium sulfite, 1g / L osmotic agent JFC, liquor ratio 1:15, kept at 95°C for 100min. After bleaching, the bleaching agent is 5g / L peroxyl acid, 2g / LLEDTA sodium salt, 1g / L penetrant JFC, 6g / L soda ash, and the temperature is kept at 80°C for 60min. The following is the same as Example 1 except that the addition amount of chloroacetic acid is changed to 1.60㎏, and the secondary addition of 50% liquid caustic soda is changed to 0.70㎏.

[0045] The sodium carboxymethyl cellulose prepared from the obtained jute wool has a degree of carboxymethyl etherification of 1.03, a transparency of 1% aqueous solution of 30cm, a viscosity of 1% of 420mpa.s, a viscosity of 2.5% of 10500mpa.s, a PVI value of 0.50, and a wire drag Sex 3mm.

Embodiment 3

[0047] The preparation of refined jute cashmere is the same as in Example 1; then, except that the amount of chloroacetic acid added is 1.40 kg, and the secondary addition of 50% liquid caustic soda is 0.52 kg, other processes for preparing sodium carboxymethyl cellulose are the same as in Example 1. The obtained product has a degree of carboxymethyl etherification of 0.96, a 1% aqueous solution transparency of 22cm, a 1% viscosity of 500mpa.s, a 2.5% viscosity of 13500mpa.s, a PVI value of 0.52, and a 2mm wire drawability.

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Abstract

The invention relates to a method for preparing high-viscosity and high-etherification-degree sodium carboxymethyl cellulose from jute. The special sodium carboxymethyl cellulose which is low in viscoelasticity and filament dragging ability is provided, and is suitable for being used as a printing-dyeing pasty material. The technological process of the method comprises the following steps: performing pretreatment on jute, performing composite alkaline treatment, bleaching, drying to obtain refined jute cellulose, performing alkalification under a low-temperature nitrogen charging oxygen insulation environment, using low-power ethanol as a medium, feeding segmentally, performing trapezoidal heating, etherifying alkali cellulose by using an etherifying agent as chloroacetic acid to obtain a product of which the ethyloic etherification degree is 1, the 1% aqueous solution viscosity is greater than 400 mPa. s, the 2.5% viscosity is greater than 10000 mPa. s, the PVT is greater than 0.50, and the filament dragging ability is smaller than 5 mm. The sodium carboxymethyl cellulose is very suitable for being used as the printing-dyeing pasty material. Through the adoption of the method, the production cost of sodium carboxymethyl cellulose is effectively reduced, the high-grade model sodium carboxymethyl cellulose is obtained, meanwhile, a high value-added way is found for resourceful jute, the product is stable, the process is reliable, the cost is lower, and an excellent market prospect is provided.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for preparing high-viscosity and high-etherification sodium carboxymethyl cellulose (hereinafter also abbreviated as NaCMC) by using jute. Background technique [0002] The aqueous solution of sodium carboxymethyl cellulose has the functions of thickening, bonding, film forming, water retention, emulsification and suspension, and is widely used in food, ceramics, oil drilling, medicine, printing and dyeing, cosmetics and other fields. At present, although there are more than 250 types of sodium carboxymethyl cellulose on the market, the raw material it uses, cellulose, is mainly taken from wood and cotton with high cellulose content and relatively simple processing technology. In recent years, the limitation of tree felling and the slow growth of cotton production have kept the price of refined grade cellulose high, while the price of sodium carboxy...

Claims

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Application Information

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IPC IPC(8): C08B11/12
Inventor 王维明陈网根朱国生
Owner HANGZHOU HONGBO NEW MATERIALS
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