The hottest transfer printing technology and the p

2022-09-28
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Transfer printing technology and pretreatment of finishing real silk

individuals can use denaturants such as melamine, paraformaldehyde and polyethylene glycol to pretreat real silk from simple product demanders to producers, together with softeners, and then use disperse dyes for transfer printing

test example: the refined and bleached real silk is treated in two dipping and two rolling baths, and the rolling liquid rate is 90%. The finishing bath is composed of the above synthetic resin, catalyst and softener. The fabric sample is dried at 90 ℃ for 3min, and then transferred and printed at 190 ℃ for 1min with a manual transfer printing machine. The printing process is: mix Indalca agbv glue (6%) into paste in cold water. The transfer paper is manually scraped twice with a sieve, and then dried at room temperature. Composition of printing paste: 4 parts of disperse dyes, 7.5 parts of anionic additives, 88.5 parts of Indalca glue (6%), a total of 100 parts. The relevant parameters are discussed as follows:

(1) the effect of resin concentration: the dye transfer percentage increases with the increase of resin concentration, but it is more than 200g/l used in the tensile, compression, zigzag and shear experiments of various materials, and the increase is very small. The more suitable resin formula is: the above synthetic resin 200g/l, that is, the shorter the wavelength, MgCl2 · 6H2O 10g/l. After soaking and rolling, the sample is dried at 90 ℃ for 3min, and then transferred at 190 ℃

the printing samples of C.I. disperse Violet 1, C.I. disperse red 1 and C.I. Disperse Orange 3 tested have unsatisfactory water washing fastness, but they have good dry cleaning fastness, indicating that a large amount of cross-linking can be formed between the fiber and the resin, so the dry cleaning solvent cannot penetrate the fiber and extract the dye

(2) fiber resin dye interaction: early studies have shown that dyes containing - NH2 groups react easily with resins, and dyes with - nhch2 - Oh have medium reactivity, while dyes without these groups do not react. The same results were obtained in the above tests, that is, C.I. disperse Purple 1 and disperse orange 3 showed greater reactivity than C.I. disperse red 1

(3) real silk finishing: synthetic resin gives real silk wrinkle resistance while transferring printing

(4) catalyst and softener: among the three catalysts of magnesium chloride, zinc nitrate and sulfamic acid, the yellowing phenomenon of magnesium chloride is less. Adding softener in the rolling bath is conducive to improving the hand feel of printed fabrics, and improving the breaking strength, tearing strength and wear fastness of silk. Among the different softeners, the yellowing of anionic and cationic types is the most serious, while the yellowing of polyethylene lotion is less. The increase of softener concentration from 15g/l to 50g/l has little effect on wrinkle recovery angle, bending length and yellowing index; The yellowing index of polyethylene lotion increased with the increase of concentration. The non-ionic softener in the rolling bath has a slightly better effect on the wrinkle recovery angle and bending length of the finished fabric than other softeners

(5) silk weight gain: 14% weight gain can be obtained by pretreatment of silk with the above synthetic resin, but the increase of weight depends on the resin concentration and wet weight in the soaking and rolling process

Treatment and utilization of waste textiles

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