Chastening blanched real silk and true silk, fizzle out in keep in storage or extensive of generation of the meeting in taking become angry, make commodity value falls. The reason with true silk yellow extensive basically depends on fibroin pledging cheese ammonia is medium lubricious ammonia acid, acerbity incomplete radical is in the amino acid that wait the oxidation in air, chromatic. And the happening that smooth existence can promote this kind of appearance.
Prevent true silk to float there are the following kinds of methods like Huang Yi:
① " foreign dye abstract " report, immerse the silk after blanching with 0.5%NaOH aqueous solution 3s, after classics crowded make friends (make friends beyond is led 80% ) investment is mixed with 1% sulfur Niao 1 of 1% , 3, 3 propylene of 5— acyl radical 6 hydrogen are acting all in the aqueous solution that 3 Qin match, immerse at 70 ℃ 30min, next bath. Handle 30min with 0.3%HCl below 70 ℃ again, bath, dry. With the silk after afore-mentioned methods are handled, its begin to float yellow index is 2.8. It is after 180 days 3.8.
② uses processing of acetyl carapace polysaccharide. In the aqueous solution of 1% acetic acid of 300mL, join 0.3—1.5g of acetyl carapace polysaccharide, preparation 0.1% ～ 0.5% take off solution of acetyl carapace polysaccharide, will true silk (10cm×10cm) in make friends of the dip in this solution, below 80 ℃ sufficient and dry, surface of real silk fiber forms film of acetyl carapace polysaccharide. Will treated true silk uses irradiation of carbolic arc lamplight (20, 40h) , take off white with automatic go smoothly photometric determine its float Huang Cheng is spent. The result is, with unsettled real silk silken photograph is compared, the true silk that handles via taking off acetyl carapace polysaccharide floats Huang Cheng is spent low.
③ is used prevent processing of HN-200 of extensive yellow agent. Preventing HN-200 of extensive yellow agent is a kind of antioxidant that company of Japanese hydrazine industry produces. Its action depends on to lively dissociate base offer an electron or give put oneself in another's position as hydrogenous atom, make oxidation reaction stops the automatic catalysis light of chain, offer the effective Huang Xiaoguo that prevent flood to true silk thereby. The method is will true silk manages at 80 ℃ temporary lodging during a trip in the HN-200 of 0.2% after 5 ～ 10min dry. The true silk after classics processing floats after illuminate of 100h xenon lamp yellow index raises a cost (△ Y1) control for unsettled half only. Nevertheless, this kind of water-solubility that prevents extensive yellow agent is bigger, with endophilicity is very small between fiber, be able to bear or endure consequently wash a gender insufficient ideal.
④ uses 2 hydroxide colophony of methylic ethylene Niao and polyurethane are compound treatment craft. True silk classics 2 hydroxide are methylic ethylene Niao colophony (DMEU) with polyurethane 105 colophony are compound treatment, can obtain the Huang Xiaoguo that prevent flood. Its method is: Be in crepe de Chine of the 07 real silk after Lian Bai L of L of DMEU 100g ／ , ／ of polyurethane 105 40g, magnesium chloride 20% (heavy to colophony) , citric acid 5% (heavy to colophony) in working fluid of composition, 15min of room temperature macerate, 2 dip 2 make friends (make friends beyond is led 90% , bath compares 1: 50) fall to carbonado beforehand at 80 ℃ 4min, bake below 140 ℃ carbonado 3min, wash 10min at 50 ℃ black next (soda ash and black piece L of each 1g ／ ) , 50 ℃ bath, after sufficient bath dry. The Huang Xiaoguo that prevent flood is: Yl of 200h illumination △ is 8.69, did not handle sample for 15.06. If this craft adds 0.5%UV-284 in fluid of compound colophony job (fight ultraviolet ray to arrange an agent) with 1%HN-200, its effect is better.
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