Research Of High Stability Delay-curing Finishing's Catalytic System For Cotton Fabric

In order to overcome the shortcomings of cotton fabrics that are easy to deform and wrinkle,so that cotton fabrics can obtain an iron-free effect that is stable in size and smooth and easy to tidy,people perform iron-free finishing on cotton fabrics,and use cross-linking agents to increase the covalent bonds between molecular chains and reduce the slip between the molecular chains,so as to achieve the purpose of anti-wrinkle.Due to problems such as unevenness and inability to produce pleats in the fabric production process of the iron-free finishing,the two processes of fabric finishing and garment production were carried out separately,and delayed baking and ironing-free finishing was developed.After the fabric is dipped in the finishing liquid,it is transported to the garment factory,and then baked after being made into garments to complete the delayed baking and no-iron finishing.However,the stability of commonly used catalysts MgCl₂?magnesium chloride?and SHP?sodium hypophosphite?is at a low level.The sensitized fabrics composed of the finishing liquid need to be transported and stored at low temperature,and partial crosslinking is likely to occur during storage,resulting in problems such as garments after baking and insufficient cross-linking and severe loss of strength.Therefore,a catalytic system is constructed,which has the following properties:it maintains a stable state before baking,and only a small amount of catalytic reaction occurs during normal temperature transportation;after high-temperature baking,it quickly catalyzes the cross-linking of the cross-linking agent and the cotton fiber to make the cotton fabric has a flat appearance,stable pleats,and a high strength retention rate.This topic mainly did research on the catalytic system from the following three aspects:Firstly,the catalytic system was compared with the traditional catalyst,the composition of the finishing liquid was used to compare the degree of cross-linking of the cotton fabric after baking,and the effect of no-iron was compared;Secondly,after the sensitized fabric was stored,the changes of wrinkle recovery angle,strong retention rate,whiteness,infrared spectrum during storage were measured,and compared with traditional catalysts,the stability of the sensitized fabric during storage was analyzed;Finally,Cotton fabrics with the same specifications and different pretreatments were subjected to delayed baking and no-iron finishing,which verified the universality of the application of the catalytic system on cotton fabrics.Through a large number of screening experiments,the catalytic system triethylenediamine-hydrochloride-magnesium chloride?DABCO-HCl-MgCl₂?and the catalytic system triethylenediamine-magnesium chloride?DABCO-MgCl₂?,as well as the catalytic system sodium citrate-hypophosphite Sodium?TCD-SHP?were determined.According to the no-iron effect and storage stability,the concentration of DABCO-HCl-MgCl₂catalyst system was determined as follows:triethylenediamine concentration 0.263 mol/L,hydrochloric acid concentration 0.289 mol/L,magnesium chloride concentration 0.04 mol/L.The component concentration of the DABCO-MgCl₂ catalytic system is:triethylenediamine concentration 0.0282 mol/L,magnesium chloride concentration 0.296 mol/L;the TCD-SHP catalytic system component concentration was:sodium citrate concentration 0.068 mol/L,sodium hypophosphite concentration 0.189 mol/L.After being prepared by Catalytic system DABCO-HCl-MgCl₂ and finishing liquid finishing and baking,the wrinkle recovery angle of the cotton fabric was 257.23°,the strong retention rate was 60.39%,the whiteness was 94.70;After being prepared by catalytic system DABCO-MgCl2 and finishing liquid finishing and baking,wrinkle recovery angle of the cotton fabric was 251.94°,the strong retention rate was 58.73%,and the whiteness was 94.71.Compared with infrared analysis,crystallinity test,thermogravimetric analysis,and SEM,the two catalytic systems consist of finishing liquid,and the degree of crosslinking was basically the same as that of the catalyst MgCl₂;The comparison of the traditional catalyst MgCl₂ under the same conditions after the liquid finishing and baking,the wrinkle recovery angle of the cotton fabric was 262.44°,the strong retention rate was 43.87%,and the whiteness was 94.72.The wrinkle resistance and whiteness were basically at the same level,and the strong retention rate was significantly improved.It is proved that the catalytic system improves the non-ironing effect of cotton fabric after delayed baking and non-ironing finishing by traditional catalytic methods.The sensitized fabrics composed of DABCO-HCl-MgCl₂ catalytic system finishing liquid were tested for stability.After 70 d of storage at 40°C,the wrinkle recovery angle was reduced by 28.77°,compared with the traditional catalyst MgCl₂;DABCO-MgCl₂,the wrinkle recovery angle was reduced by 40.09°.It was proved that the catalytic system DABCO-HCl-MgCl₂ and the catalytic system DABCO-MgCl₂ could significantly improve the storage stability of the etherified 2 D resin delayed baking and ironing-free finishing sensitized fabrics.After being prepared by Catalytic system TCD-SHP and finishing liquid finishing and baking,the wrinkle recovery angle of the cotton fabric was 233.73°,the strong retention rate65.66%,the whiteness was 93.82.Under the same conditions,compared with catalyst SHP,after being prepared by catalyst SHP and finishing liquid finishing the baking,r the wrinkle recovery angle of the cotton fabric was 241.36°,strong retention rate was 61.55%,the whiteness was 93.11.The catalytic system TCD-SHP effectively improved the whiteness of cotton fabric BTCA after no-iron finishing,the strength loss was slightly improved,and the wrinkle resistance was basically at the same level;By infrared analysis,crystallinity test,thermogravimetric analysis,and SEM comparison,the degree of crosslinking between BTCA and cotton fibers of these two catalytic methods of catalysis was basically at the same level.After being prepared by the catalytic system TCD-SHP and finishing liquid finishing,the stability test of the sensitized fabric was carried out.After storing at 40°C for 70 d,the wrinkle recovery angle was reduced by 30.66°,compared with the traditional catalyst SHP,which significantly increased the delayed baking of BTCA storage stability of sensitized fabric after bake-free finishing.After being prepared by the catalytic system DABCO-HCl-MgCl₂,the catalytic system DABCO-MgCl₂,and the catalytic system TCD-SHP,and then made up a finishing liquid,we finished four cotton fabrics with the same specifications and different pretreatments to test the no-iron effect and storage stability and compare with the traditional catalyst MgCl₂ and the SHP,it was proved that different pretreatments have no effect on the ironing-free effect and storage stability of cotton fabrics after finishing with three catalytic system components.The catalytic system DABCO-HCl-MgCl₂,the catalytic system DABCO-MgCl₂,and the catalytic system TCD-SHP were universal.