CN102454125A

CN102454125A - Stripping method suitable for deep-color cashmere qualitative and quantitative process

Info

Publication number: CN102454125A
Application number: CN201010519659XA
Authority: CN
Inventors: 田晓蕊; 卫敏; 黄海刚; 林丽云
Original assignee: FUJIAN PROVINCE FIBER INSPECTION BUREAU
Current assignee: FUJIAN PROVINCE FIBER INSPECTION BUREAU
Priority date: 2010-10-25
Filing date: 2010-10-25
Publication date: 2012-05-16

Abstract

The invention discloses a method for treating a deep-color dyed cashmere product with a citrate solution of sodium hydrosulfite. In the method, the citrate solution of sodium hydrosulfite is used for treating the deep-color dyed cashmere product so as to strip off dyes from fibers, and the requirements of the cashmere qualitative and quantitative process are met. The method comprises the following steps of: heating the citrate solution, adding sodium hydrosulfite and test samples, washing with clear water and naturally drying. The method has the characteristics that based on the strong reduction of sodium hydrosulfite and excellent solubility of the citrate solution to some dyes, color bodies in the dyes are damaged to reach the purpose of color stripping; meanwhile, the scale state of fibers is not damaged to the greatest extent, so that the requirement on completeness of scales in the deep-color cashmere qualitative and quantitative process is reached. When used for stripping off color from deep-color cashmere, the method has the advantages of low price, simpleness in process, high operability and good stripping effect.

Description

A kind of stripping method of suitable dark cashmere qualitative, quantitative

Technical field

The present invention relates to a kind of stripping method of dark cashmere dying product; Specifically be to utilize the citrate solution of sodium hydrosulfite that dark cashmere dying product is carried out stripping treatment; Do not damaging under the situation of cashmere fiber flaky state as far as possible; Farthest remove the dyestuff on the fiber, improve the definition of cashmere in microscopic examination, improve the accuracy and the efficient of its qualitative, quantitative.

Background technology

The general detection method of woollen and cashmere is the microscope sciagraphy; This method adopts transmitted light that the fiber flaky shape projection in the fine hair section is reproduced; The detail pictures that represents the woollen and cashmere scale is as much as possible analyzed identification according to testing staff's experience to woollen and cashmere.And for dark woollen and cashmere sample, transmitted light is difficult to pass, and under projecting apparatus or CU, is difficult to the clear scale structure characteristic that manifests woollen and cashmere, has increased the difficulty of identification greatly.For this situation, need to remove the dyestuff on the fiber, to improve resolution ratio and the accuracy rate that detects.And mention the levelling agent stripping method in paregal O that is adopted in the present GB/T 16988-1997 appendix and the pertinent literature; All can only carry out very slight divesting to dyestuff; The needs of stripping in the dyeing and finishing technology and returning something for repairs can be satisfied to a certain extent, but the requirement that cashmere detects can not be satisfied far away.

Sodium hydrosulfite destroys the chromogen in the dye molecule through reduction; Reach and fade or the purpose of colour killing; It is under alkali condition, to boil to boil that traditional sodium hydrosulfite is stripped, and high temperature is bigger to cashmere fiber scale damage with alkalescence, can't satisfy in the cashmere qualitative, quantitative requirement to the scale integrality.According to citrate solution some dyestuff had reasonable dissolubility; Use the faintly acid citrate solution of pH=6 and 70 ℃ lower temperature instead; Test shows that this method has not only improved the effect of stripping greatly; And to the scale not damage basically of cashmere fiber, this method can satisfy the needs of dark woollen and cashmere qualitative, quantitative in the examination of fibers work basically at present.

Summary of the invention

Technical problem to be solved by this invention mainly provides a kind of stripping method of suitable dark cashmere qualitative, quantitative, guarantees that simultaneously the scale of cashmere fiber is injury-free as far as possible.Dark cashmere fiber after the present invention strips not only color has obtained significantly divesting, and the scale integrality can be guaranteed basically, makes that microscopically cashmere fiber flaky shape can be clear and legible, has improved the accuracy and the efficient of cashmere qualitative, quantitative greatly.

The present invention is achieved in that a kind of stripping method of dark cashmere; Its technological process is: the iodine flask that will fill the 100ml citrate solution in thermostat water bath, be heated to 70 ℃ → add the 4g sodium hydrosulfite rapidly and stir → add and splitted into the dark cashmere dying product (general enough fiber film-makings get final product) of yarn in right amount, insulation 20min (during the basis situation of stripping can reduce the time) → with a large amount of flushing with clean water → dry naturally.

Advantage of the present invention is: cheap, method is simple, and is workable; It is effective to strip; Simultaneously the contrast test according to white suede proves that also this method can not damaged the flaky state of cashmere fiber basically, can satisfy in the examination of fibers requirement of stripping to dark cashmere; Promptly (1) liquid of stripping does not damage or damages less as far as possible the flaky state of wool fibre, accomplishes not influence the judgement of woollen and cashmere as far as possible; (2) divest the dyestuff that non-covalent bond combines basically, transmitted light can be passed, under light microscope, present the edge and the flaky state of fine animal fibre more clearly.

Description of drawings

Fig. 1 is a process chart;

Fig. 2 is directly perceived for the effect of stripping;

Fig. 3 is the microscopic examination comparison diagram;

Fig. 4 is a comparison diagram before and after the white suede of microscopic examination is stripped.

The specific embodiment

Embodiment:

Black cashmere sample and white suede control sample have been carried out following test respectively, like following table:

Sample	Citrate solution/ml	Sodium hydrosulfite/g	Temperature/℃	Time/min	pH
						Black cashmere sample	100	4	70	20	6.0
White suede sample	100	4	70	20	6.0

This programme is handled aspects such as front and back contrast from observation directly perceived, microscopic examination and white suede scale, and effect has been carried out integrated survey to stripping.Strip effect intuitively shown in the observation figure like Fig. 2, and after this method stripping treatment, black cashmere yarn sample becomes khaki by original aterrimus, and color has had significantly and divests.And Fig. 3 microscopic examination comparison diagram also can be found out, almost can't see scale structure without the fiber before the stripping treatment at microscopically, and than former state, the scale of sample fiber is high-visible at microscopically after stripping treatment.Simultaneously, can find out that by Fig. 4 white suede control sample processing front and back flaky state does not change basically, explains that this stripping method does not cause serious damage to the cashmere scale.

Claims

1. the present invention is a kind of stripping method of suitable dark cashmere qualitative, quantitative, and wherein technological process is: citrate solution is heated to 70 ℃ → take a policy powder and sample to be stripped → a large amount of flushing with clean water → dry naturally.It is characterized in that: sodium hydrosulfite speed is joined fast usefulness, to keep its activity to greatest extent, prevents that its decomposition from causing reduced activity, and the efficient of stripping reduces, and makes full use of citrate solution simultaneously some dyestuff is had better deliquescent characteristic.

According to a large amount of flushing with clean water of claim 1 with dry naturally, it is characterized in that: the yarn after stripping should fully clean, and dries as far as possible naturally, avoids hyperthermia drying, further impaired with the minimizing fiber.