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A kind of chemical modification method of flax short fiber

A chemical modification, short fiber technology, applied in the direction of plant fiber, fiber treatment, improved hand fiber, etc., to achieve the effect of reduced crystallinity, mild processing conditions, and simple operation

Inactive Publication Date: 2018-12-18
QIQIHAR UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to investigations, using this processing method, flax staple fibers are suitable for weft knitting single jersey yarns for circular knitting machines. At present, there are no reports at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Process flow of the present invention:

[0021] (1) Pre-treatment of waste caustic soda circulation reboiling: sodium carbonate 6.0 g / L, sodium sulfite 3.0 g / L, urea 8.0 g / L, temperature 95°C, time 50 min, bath ratio 1:30, cyclic scouring;

[0022] (2) Warm water washing: 35°C; wash until the pH is 7.0-7.2;

[0023] (3) Sodium periodate oxidation: sodium periodate 4.0g / L, temperature 35°C, time 30min, bath ratio 1:30, soak in dark;

[0024] (4) Soaking in glycerol solution: 0.10 mol / L, temperature 20°C, time 25 min;

[0025] (5) Washing with deionized water: 20-30°C, fully wash with water;

[0026] (6) Dehydration;

[0027] (7) Drying: 90~95℃ to constant weight.

[0028] The aldehyde group content of the modified flax short fiber is 216.67 umol / g, the O’KI infrared crystallization index is 0.8293, the splitting degree is 1259 Nm, and the breaking strength is 7.89 cN·tex -1 , elongation 5.03%, whiteness 73.15%.

Embodiment 2

[0030] Process flow of the present invention:

[0031] (1) Pre-treatment of waste caustic soda circulation reboiling: sodium carbonate 6.0 g / L, sodium sulfite 3.0 g / L, urea 8.0 g / L, temperature 95°C, time 55 min, liquor ratio 1:30, cyclic scouring;

[0032] (2) Warm water washing: 35°C; wash until the pH is 7.0-7.2;

[0033] (3) Sodium periodate oxidation: sodium periodate 4.5g / L, temperature 40°C, time 30min, bath ratio 1:30, soak in dark;

[0034] (4) Glycerol solution soaking: 0.12mol / L, temperature 20°C, time 25min;

[0035] (5) Washing with deionized water: fully wash at a temperature of 20-30°C;

[0036] (6) Dehydration;

[0037] (7) Drying: 90~95℃ to constant weight.

[0038] The aldehyde group content of the modified flax short fiber is 223.41 umol / g, the O’KI infrared crystallization index is 0.8351, the splitting degree is 1248 Nm, and the breaking strength is 7.72 cN·tex -1 , elongation 5.43%, whiteness 74.71%.

Embodiment 3

[0040] Process flow of the present invention:

[0041] (1) Pre-treatment of waste caustic soda circulation reboiling: sodium carbonate 6.0 g / L, sodium sulfite 3.0 g / L, urea 8.0 g / L, temperature 90°C, time 55 min, liquor ratio 1:30, cyclic scouring;

[0042] (2) Warm water washing: 40°C; wash until the pH is 7.0-7.2;

[0043] (3) Sodium periodate oxidation: sodium periodate 4.5g / L, temperature 40°C, time 35 min, bath ratio 1:30, soak in dark;

[0044] (4) Soaking in glycerol solution: 0.15 mol / L, temperature 22°C, time 30 minutes;

[0045] (5) Washing with deionized water: fully wash at a temperature of 20-30°C;

[0046] (6) Dehydration;

[0047] (7) Drying: 90~95℃ to constant weight.

[0048]The aldehyde group content of the modified flax short fiber is 230.55 umol / g, the O’KI infrared crystallization index is 0.8362, the splitting degree is 1257 Nm, and the breaking strength is 8.03 cN·tex -1 , elongation 4.99%, whiteness 74.96%.

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Abstract

The invention discloses a chemical modification method of short flax fibers. Short flax fibers are used as a raw material. The method comprises the following steps: carrying out pretreatment by an alkali waste circulatory reboiling method, carrying out selective oxidation by the use of sodium periodate, immersing with a glycerol solution, washing with deionized water, dehydrating, and drying. By the method, split degree, whiteness and spinnability of short flax fibers can be enhanced, short fibers become soft, and anti-crease property is improved. Aldehyde content of modified short flax fibers is 216.67-233.58 umol / g; infrared crystallization index of O' KI is 0.8285-0.8374; split degree is 1225-1262 Nm; breaking strength is 7.64-8.40 cN.tex<-1>; elongation is 4.97-5.46%; whiteness is 72.11-75.03%. The method meets the technical requirements of flax yarn production for circular knitting machine for weft knitting of single jersey. Processing range of short flax fibers is broadened.

Description

technical field [0001] The invention relates to a chemical modification method of flax staple fiber, which belongs to the technical field of textiles. Background technique [0002] Flax short fiber is machine-made short flax produced in the process of combing and beating into flax. It has high impurity content and poor spinnability, but its quantity is more than half of all spinning raw materials, and compared with long flax In other words, the price of short linen is low. Reasonable and effective use of flax staple fiber can save costs and have a large space for value. [0003] In the present invention, firstly, the flax short fiber is pretreated by using the recycling and reboiling method of spent alkali to remove some impurities such as pectin and lignin. Then, sodium periodate is used to selectively oxidize the scoured flax short fibers, and aldehyde groups are introduced into the cellulose macromolecules of the short fibers to achieve the purpose of modification. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M13/432D06M11/76D06M11/54D06M11/30D06M13/148D06L4/22D06M101/06
CPCD06M11/30D06M11/54D06M11/76D06M13/148D06M13/432D06M2101/06D06M2200/50
Inventor 高洁赵欣刘琨李海楠唐晓姚悦
Owner QIQIHAR UNIVERSITY
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