CN1773009A

CN1773009A - Soybean protein fiber bleaching composition and bleacing method thereof

Info

Publication number: CN1773009A
Application number: CNA2005100309919A
Authority: CN
Inventors: 郑敏; 唐人成
Original assignee: Suzhou University
Current assignee: Suzhou University
Priority date: 2005-11-03
Filing date: 2005-11-03
Publication date: 2006-05-17
Anticipated expiration: 2025-11-03
Also published as: CN100338295C

Abstract

The present invention discloses a bleaching compound for bleaching soybean protein fibre or its blended fabric. Said bleaching compound mainly is formed from bleaching agent and activating agent, the bleaching agent is product prepared by using sodium borohydride and sodium bisulfite, and the activating agent is the compound formed from sulphourea and hydroperoxide and penetrating agent, etc. Besides, said invention also provides the application method of said bleaching compound.

Description

Soybean Protein Fiber Bleaching Composition And Its Bleaching Method

Technical field

The present invention relates to the textile dyeing and finishing technical field, particularly a kind of bleaching composition and using method thereof that soybean fiber is bleached of being used for.

Background technology

Soybean fiber is the novel comfortableness fiber of the unique independent development of China, belong to a kind of aftergrowth azelon, satisfy the requirement of people to green product, and contain each seed amino acid in the soybean protein to the human body beneficial, therefore be again a kind of health fiber that helps health, thereby cause extensive concern both domestic and external.

But, soybean fiber fabric is in processing and take and exposed easy pilling in the process, the BLEACHED FABRIC whiteness is low, bright in colour poor, outstanding problems such as the relatively poor and level-dyeing property of depth is relatively poor, wherein topmost technological difficulties are the bleaching of soybean fiber, this is because colored component in the soybean fiber and formation reason more complicated thereof, conventional bleaching agent and bleaching process are difficult to the whiteness that reaches desirable, this not only brings the outward appearance of bleach product and has a strong impact on, and to dyeing vividness certain influence is arranged, particularly make such as gorgeous indigo plant, gorgeous purple, the shallow faint colour dyeing of bright green is difficulty especially, therefore how the selection by bleaching agent and bleaching process, guaranteeing to improve the bleaching whiteness under the situation that soybean protein does not lose substantially, be the smooth precondition and guarantee of subsequent technique.

In recent years, the researcher has carried out various trials to the bleaching process of soybean fiber, attempt to solve the bleaching difficult problem of soybean fiber, improve whiteness as in hydrogen peroxide bleaching liquid, adding urea, adopt the ferrous ion selective absorption catalysis hydrogen peroxide bleaching in coloured animal wool, adopt the product peracetic acid of hydrogen peroxide and acetic anhydride to bleach, wherein, the peroxyacetic acid bleaching effect is better than other bleaching effect.Publication is at " silk " magazine [2003,11:32～36] on " fibre and soya with the bleaching of hydrogen peroxide/tetraacetyl ethylene diamine activation system " literary composition in, disclose a kind of hydrogen peroxide and TAED of utilizing and generated the technical scheme that peracetic acid is bleached fibre and soya on the spot, the fibre and soya whiteness after the processing can reach 80; Publication is at " textile journal " magazine [2002,3 (4): 59～61] in " soybean/polyester blended fabric peracetic acid bleaching process research " literary composition on, a kind of technical scheme that adopts the peracetic acid bleaching is disclosed, 60～70 ℃ of following blanching soya beans/blend polyester fiber 40 minutes, can make the whiteness of fabric reach 79.3 with the peracetic acid of 7-9g/L.Though the peracetic acid bleaching effect is better, but peracetic acid decomposes easily, as be heated, decomposition that the variation of heavy metal ion, pH value etc. all can cause peracetic acid, make that bleaching process control is difficult, influence bleaching effect, simultaneously, also can produce abstriction the soybean protein peptide bond, influence the intensity of fibre and soya, its application is restricted.

Summary of the invention

The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of and guaranteeing to improve its bleaching effect under the break-even substantially prerequisite of soybean protein, and environmental protection, energy-conservation soybean protein fiber bleaching composition and using method thereof.

For achieving the above object, the technical solution used in the present invention is: a kind of soybean protein fiber bleaching composition, composition comprise bleaching agent and activator, wherein, bleaching agent is the product of sodium borohydride and sodium hydrogensulfite, and the mol ratio of sodium borohydride, sodium hydrogensulfite is 1: 4～6; Activator is the adduct of hydrogen peroxide and thiocarbamide, and the mol ratio of thiocarbamide, hydrogen peroxide is 1: 1.

A kind of method that adopts above-mentioned soybean protein fiber bleaching composition that soybean fiber is bleached, step is as follows:

(1) be that 1: 4～6 ratio is made bleaching agent in molar ratio with sodium borohydride, sodium hydrogensulfite, with thiocarbamide and hydrogen peroxide is that 1: 1 ratio is combined into activator in molar ratio, above-mentioned bleaching agent, activator are formed bleaching composition to join in the water-bath, make bleaching liquor, wherein, total consumption of bleaching composition is 3～10g/L, regulates bleaching liquor pH value to 9～10 with sodium bicarbonate;

(2) fabric being put into bath raio is 1: 30～50 bleaching liquor, and bleaching temperature is 60～90 ℃, and bleaching time is 20～60min; Wash, wash, dry through acetic acid again.

The preparation method of bleaching liquor is, earlier sodium borohydride joined in the water-bath that contains sodium hydrogensulfite, perhaps will boron hydride and sodium hydrogensulfite join again in the water-bath after mixing, the adduct with hydrogen peroxide and thiocarbamide joins in the above-mentioned water-bath again.

In the described bleaching composition of technical solution of the present invention, the reaction equation of boron hydride and sodium hydrogensulfite is:

The key reaction equation of hydrogen peroxide and thiocarbamide is:

By the reaction equation of boron hydride and sodium hydrogensulfite as can be known, in soybean protein fiber bleaching process of the present invention, that play discoloration is its product S ₂O ₄ ^2-, and the adduct of hydrogen peroxide and thiocarbamide plays activation in bleaching process, can promote the generation of this reactant effectively, improves bleaching effect and efficient.

Outstanding advantage of the present invention is:

1, in technical solution of the present invention, because the reasonable use of activator, significantly improved the bleaching effect of bleaching agent to soybean fiber, bleaching back fabric whiteness can reach more than 80, solved the problem of soybean protein fiber bleaching difficulty preferably, for applying of this new fiber opened up brand-new approach.

2, no matter at the bleaching process that technical solution of the present invention adopted soybean protein is not had influence, be that high temperature speed is floated or low temperature floats slowly, and the protein of fiber, intensity etc. all do not have damage, have protected the health care of natural fabric and good wearability effectively.

3, adopt technical solutions according to the invention, can realize that high temperature speed floats, low temperature floats slowly, but energy savings; Employed auxiliary agent and product are pollution-free, and therefore, this soybean protein fiber bleaching technology is the energy-saving and environmental protection type, and popularizing application prospect is wide.

Description of drawings

Fig. 1 is to use the fiber infrared absorpting light spectra that records before the soybean protein fiber bleaching method of the present invention;

Fig. 2 is to use the fiber infrared absorpting light spectra that records after the described soybean protein fiber bleaching method of one embodiment of the invention.

The specific embodiment

Below by embodiment and in conjunction with subordinate list figure, technical scheme of the present invention is further elaborated.

Embodiment 1:

Add the 80ml distilled water diluting again after 2g sodium borohydride and 3.86g sodium hydrogensulfite mixed in charging spout, adding the concentration that 12mL prepares in advance then is hydrogen peroxide, the thiocarbamide compound of 50g/L, the mol ratio of hydrogen peroxide, thiocarbamide is 1: 1, add the penetrating agent JFC that 5mL concentration is 20g/L again, regulating bleaching liquor pH value with sodium bicarbonate is about 10, bleaching liquor is warming up to 50 ℃, drop into fabric, continue to be warming up to 90 ℃ then, insulation 20min takes out, with the aqueous acetic acid washing of 1g/L, the warm water washing is dried.

Referring to accompanying drawing 1, it is to use the fiber infrared absorpting light spectra that records before the soybean protein fiber bleaching method of the present invention; Referring to accompanying drawing 2, it is to adopt the fiber infrared absorpting light spectra that records after the above-mentioned soybean protein fiber bleaching method; The Magna-IR550 infrared spectrometer record Fourier infrared spectrum (FI-IR) of Nicolet company, pellet technique sample preparation are used in test.Before and after the bleaching infrared spectrogram of soybean fiber as can be seen, the position of absworption peak is difference not obviously, just minor variations occurred in the characteristic absorption position of soybean protein acid amides I and II, is 1667.0cm before bleaching ^-1And 1535.8cm ^-1, the bleaching back is 1651cm ^-1And 1543cm ^-1, this is that this pigment has certain influence to the characteristic absorption peak of soybean protein, simultaneously, has illustrated that also method for bleaching of the present invention has good bleaching effect to soybean fiber because there is pigment in soybean fiber before bleaching.

Table 1 is the chromatic value comparative evaluation table that adopts different bleaching composition blanching soya beans azelon fabric samples, and the Lab value of sample (sample sequence number 1～5) and whiteness, yellow degree are measured on the UltraScan XE of U.S. HunterLab company colour photometer.

Referring to table 1, the sample of sequence number 1～4 has adopted different bleaching agents respectively, and bleaching time is 60min, and temperature control is identical with present embodiment technology, the sample of sequence number 5 is bleaching composition and the bleaching process that present embodiment adopted, as can be seen from Table 1, adopt activator of the present invention after, the whiteness of soybean fiber fabric obviously improves, the Huang degree obviously reduces, bleaching time has shortened 40min, has not only improved bleaching effect, and has saved the time and the energy.

Table 2 is the nitrogen content of azelon before and after the bleaching of soybean fiber fabric sample and the table with test results of Main physical performance; Wherein, nitrogen content is measured on the MOD 1106 type elemental analysers of Italian Carlo Erba company, gets the mean value of secondary measurement result.Referring to table 2, wherein, the sample of sequence number 1 is the former state of handling without bleaching, the sample of sequence number 2 is through the sample after present embodiment bleaching composition and the bleaching process processing, as can be seen from Table 2, the nitrogen content of bleaching back sample is 2.909485%, and the nitrogen content of former state is 2.979906%, and nitrogen content has only descended 0.02%; Ultimate strength and elongation at break do not have obvious variation yet before and after the bleaching, this has illustrated bleaching composition provided by the present invention and method for bleaching, not only can remove pigment preferably, reach good bleaching effect, but also not damage the structure of soybean fiber substantially.

Table 1

Sequence number	Bleaching composition	L ^*	a ^*	b ^*	Brightness	Whiteness	Huang Du
Sequence number	Bleaching composition	L ^*	a ^*	b ^*	Brightness	Whiteness	Huang Du	1 2 3 4 5	There is not bleaching (former state) hydrogen peroxide bleaching sodium hydrosulfite bleaching sodium borohydride/sodium hydrogensulfite sodium borohydride/sodium hydrogensulfite+activator	78.29 88.57 81.95 86.2 86.83	6.5 -0.22 4.02 0.61 0.76	25.74 18.93 19.59 16.9 14.03	34.51 40.56 40.72 51.86 55.62	69.57 77.89 73.06 78.06 80.76	40.90 34.83 37.21 32.80 29.15

Table 2

Sequence number	The sample title	Nitrogen content %	Weight (g)	Ultimate strength (N)	The extension at break degree
Sequence number	The sample title	Nitrogen content %	Weight (g)	Ultimate strength (N)	The extension at break degree	1	Former state	2.979906	2	624	9.342
2	The bleaching sample	2.909485	1.91	582	9.146	1	Former state	2.979906	2	624	9.342
2	The bleaching sample	2.909485	1.91	582	9.146		Rate of change %	0.02	4.5	6.7	2.1

Embodiment 2:

The 2g sodium borohydride is joined in the 80mL water-bath that contains 3.86g sodium hydrogensulfite and fabric, adding the concentration that 12mL prepares in advance then is hydrogen peroxide, the thiocarbamide compound of 50g/L, its mol ratio is 1: 1, and adding 5mL concentration is the JFC bleeding agent of 20g/L, and regulating bleaching liquor pH value with sodium bicarbonate is about 9, bleaching liquor is warming up to 90 ℃, insulation 20min takes out, with the aqueous acetic acid washing of 1g/L, the warm water washing is dried.Bleaching back fabric whiteness is 80.2.The adding mode of this explanation boron hydride and sodium hydrogensulfite is more flexible, can decide as the case may be.

Embodiment 3:

The 2g sodium borohydride is joined in the 80mL water-bath that contains 3.86g sodium hydrogensulfite and fabric, adding the concentration that 12mL prepares in advance then is hydrogen peroxide, the thiocarbamide compound of 50g/L, its mol ratio is 1: 1, adds the penetrating agent JFC of 1g/L, and regulating bleaching liquor pH value with sodium bicarbonate is about 9.5, bleaching liquor is warming up to 70 ℃, insulation 60min takes out, with the acetum washing of 1g/L, the warm water washing is dried.Bleaching back fabric whiteness is 79.6.Under the less demanding situation of bleaching, can adopt this bleaching composition to carry out low temperature and float energy savings slowly.

Claims

1, a kind of soybean protein fiber bleaching composition is characterized in that: it comprises bleaching agent and activator, and described bleaching agent is the product of sodium borohydride and sodium hydrogensulfite, and the mol ratio of sodium borohydride, sodium hydrogensulfite is 1: 4～6; Described activator is the adduct of hydrogen peroxide and thiocarbamide, and the mol ratio of thiocarbamide, hydrogen peroxide is 1: 1.

2, a kind of method that soybean fiber is bleached is characterized in that step is as follows:

(2) soybean fiber being put into bath raio is 1: 30～50 bleaching liquor, and bleaching temperature is 60～90 ℃, and bleaching time is 20～60min; Wash, wash, dry through acetic acid again.

3, the using method of a kind of soybean protein fiber bleaching composition according to claim 2, it is characterized in that: the preparation method of described bleaching liquor is, earlier sodium borohydride is joined in the water-bath that contains sodium hydrogensulfite, perhaps will join in the water-bath after boron hydride and the sodium hydrogensulfite mixing, the adduct with hydrogen peroxide and thiocarbamide joins in the above-mentioned water-bath more again.