Low-color-change fluffy finishing process for regenerated cotton-polyester blended fabric

Abstract

The invention provides a low-color-change fluffy finishing process for regenerated cotton-polyester blended fabric. The low-color-change fluffy finishing process comprises the following steps: S1, preparing an aqueous solution I of a fluffy finishing agent, an aqueous solution II of the fluffy finishing agent and an aqueous solution III of the fluffy finishing agent; the fluffy finishing agent comprises the following raw materials: 70-90% of modified silicone oil and 10-30% of a surfactant; s2, soaking the regenerated cotton-polyester blended fabric in water, and rolling; s3, performing pressure impregnation in an aqueous solution I of a fluffy finishing agent under the pressure of 0.16-0.17 MPa, and performing roll compacting and baking; s4, performing pressure impregnation in an aqueous solution II of a fluffy finishing agent at the pressure of 0.135-0.14 MPa, and performing roll compacting and baking; and S5, placing in an aqueous solution III of a fluffy finishing agent, carrying out pressure impregnation at the pressure of 0.12-0.125 MPa, rolling, and baking. The regenerated cotton-polyester blended fabric obtained through finishing is high in bulkiness and softness and low in color change.

Description

Technical Field

[0001] The invention relates to the technical field of fabric finishing, and in particular to a low-color-change and fluffy finishing process for a recycled polyester-cotton blended fabric. Background Art

[0002] Recycled polyester-cotton blended fabric refers to a fabric made by blending polyester fibers with recycled cotton fibers (i.e. recycled cotton). The production of recycled polyester-cotton blended fabric involves multiple steps, including the recycling, processing, spinning and blending of recycled cotton with polyester fibers. Due to its various excellent properties, recycled polyester-cotton blended fabric is widely used in clothing, home textiles, industrial textiles and other fields.

[0003] With the improvement of environmental awareness and the concept of sustainable development, recycled polyester-cotton blended fabrics will be more and more popular in the market as an environmentally friendly textile. At the same time, consumers' requirements for the quality and performance of recycled polyester-cotton blended fabrics will continue to increase, among which fluffy and soft is one of the important performance indicators. In order to improve the fluffy and softness of recycled polyester-cotton blended fabrics, they need to be fluffed. Fluffy finishing can make the fabric surface softer. Fluffy finishing can also improve the touch of the fabric, making it more delicate and skin-friendly, thereby enhancing consumers' wearing experience.

[0004] At present, in order to improve the versatility of silicone softeners, amino groups are introduced into silicone molecules, which can effectively improve the binding ability and firmness of silicone molecules to fibers. On the one hand, it is because amino groups have greater polarity, and can hydrogen bond or react with hydroxyl groups, carboxyl groups and other groups on the fiber surface to make the organopolysiloxane molecules firmly adsorbed on the surface, thereby reducing the friction between the fibers and obtaining a good hand feel; on the other hand, carbon dioxide and water in the air can form carbonic acid that ionizes into hydrogen protons and combines with amino groups to form positively charged amino groups, which is beneficial to the directional arrangement of organopolysiloxane on the fiber surface, thereby improving the smoothness, softness and fluffiness of the fabric.

[0005] However, due to the special activity of the amino functional group, the amino group will be oxidized to form a chromophore under the influence of heating and ultraviolet rays, causing yellowing of white finished fabrics and color change of colored finished fabrics. Yellowing and color change have always been important evaluation indicators of silicone finishing agents in addition to hand feel. Therefore, when performing fluffy finishing on recycled polyester-cotton blended fabrics, the silicone softener used needs to improve the fluffy performance of the recycled polyester-cotton blended fabric and also make the fabric have low color change. At the same time, the fluffy finishing is currently carried out by a one-time normal pressure padding finishing method, but this method may cause problems such as uneven adsorption of the fluffy finishing agent on the fiber surface or local excessive accumulation, thereby reducing the fluffy finishing effect. Summary of the invention

[0006] The purpose of the present invention is to provide a low-color-change and fluffy finishing process for recycled polyester-cotton blended fabrics, which can make the recycled polyester-cotton blended fabrics have high fluffiness and softness and low color change.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: A low color change and fluffy finishing process for recycled polyester-cotton blended fabric, comprising the following steps: S1, prepare an aqueous solution of a fluffy finishing agent with a concentration of 0.5-1g / L, an aqueous solution of a fluffy finishing agent with a concentration of 3-4.5g / L, and an aqueous solution of a fluffy finishing agent with a concentration of 7-9g / L; The fluffy finishing agent includes the following raw materials in weight percentage: modified silicone oil 70-90%, surfactant 10-30%; S2, soaking the recycled polyester-cotton blended fabric in water at 50-55°C for 1.5-2h, and then rolling it; S3, placing the regenerated polyester-cotton blended fabric obtained by the treatment in step S2 in an aqueous solution of a fluffy finishing agent for pressure impregnation at a pressure of 0.16-0.17 MPa, and then rolling and baking; S4, placing the regenerated polyester-cotton blended fabric obtained by the treatment in step S3 in the second aqueous solution of the fluffy finishing agent for pressure impregnation, the impregnation pressure is 0.135-0.14MPa, and then rolling and baking; S5. The regenerated polyester-cotton blended fabric obtained by the treatment in step S4 is placed in the aqueous solution 3 of the bulking finishing agent for pressure impregnation at a pressure of 0.12-0.125 MPa, and then rolled and baked.

[0008] Preferably, in step S3, the pressure impregnation temperature is 35-40°C and the time is 2-3 min; in step S4, the pressure impregnation temperature is 35-40°C and the time is 4-6 min; in step S5, the pressure impregnation temperature is 40-45°C and the time is 8-10 min.

[0009] Preferably, in step S2, the rolling ratio of rolling is 60-70wt%, in step S3, the bath ratio is 1:10-15, the rolling ratio of rolling is 75-80wt%, the baking temperature is 65-70℃, and the baking time is 25-30min; in step S4, the bath ratio is 1:10-15, the rolling ratio of rolling is 75-80wt%, the baking temperature is 65-70℃, and the baking time is 25-30min; in step S5, the rolling ratio of rolling is 80-85wt%, the bath ratio is 1:10-15, and during the baking, the mixture is first baked at 80-85℃ for 10-12min, and then the temperature is raised to 135-145℃ and baked for 1.5-2min.

[0010] Preferably, the preparation method of the modified silicone oil comprises the following steps: (1) placing hydrogen-terminated polydimethylsiloxane, allyl glycidyl ether, and glycidyl ether allyl polyoxyethylene ether in isopropanol, and adding a catalyst to react; after the reaction is completed, concentrating under reduced pressure to remove the isopropanol, and preparing a modified polysiloxane intermediate; (2) The modified polysiloxane intermediate is reacted with polyethyleneimine and polyetheramine in isopropanol. After the reaction is completed, the isopropanol is removed by concentration under reduced pressure to prepare the modified silicone oil.

[0011] Preferably, in step (1), the molar ratio of the hydrogen-terminated polydimethylsiloxane to allyl glycidyl ether and glycidyl ether allyl polyoxyethylene ether is 1:0.7-0.8:0.35-0.4; The catalyst is chloroplatinic acid; the amount of the catalyst added is 0.001-0.003% of the mass of the hydrogen-terminated polydimethylsiloxane.

[0012] Preferably, in step (1), the reaction temperature is 100-110°C and the reaction time is 3.5-5h; The mass ratio of the isopropanol to the hydrogen-terminated polydimethylsiloxane is 2-2.5:1; Preferably, in step (2), the molar ratio of the modified polysiloxane intermediate to polyethyleneimine and polyetheramine is 10:2.2-2.8:0.7-1; The molecular weight of the polyethyleneimine is 2000-3000; the polyetheramine is one or more of polyetheramine ED600 and polyetheramine ED900.

[0013] Preferably, in step (2), the reaction time is 6.5-8 hours, the reaction temperature is 75-85° C., and the mass of the isopropanol is 2.5-3.5 times the total mass of the modified polysiloxane intermediate.

[0014] Preferably, in step (1), the method for preparing hydrogen-terminated polydimethylsiloxane comprises the following steps: using octamethylcyclotetrasiloxane and 1,1,3,3-tetramethyldisiloxane as raw materials, under the catalytic action of acidic clay, to prepare hydrogen-terminated polydimethylsiloxane; the molar ratio of octamethylcyclotetrasiloxane to 1,1,3,3-tetramethyldisiloxane is 5-5.5:1; The preparation method of glycidyl ether allyl polyoxyethylene ether comprises the following steps: taking allyl polyoxyethylene ether and epichlorohydrin as raw materials, generating an allyl polyoxyethylene chlorohydrin ether intermediate through a ring-opening reaction under the catalytic action of NaH, and then performing a ring-closing reaction under the action of NaOH to prepare glycidyl ether allyl polyoxyethylene ether; the molar ratio of the allyl polyoxyethylene ether to the epichlorohydrin is 1:1.7-2.

[0015] Preferably, the surfactant is composed of dodecyl glucoside and dodecyl dimethyl betaine in a mass ratio of 1:0.2-0.6.

[0016] The beneficial effects of the present invention are: 1. When the present invention performs fluffy finishing on the recycled polyester-cotton blended fabric, an aqueous solution of a fluffy finishing agent with a relatively low overall concentration and increasing concentration is used for finishing, and pressure impregnation is performed in combination with an appropriate pressure during each finishing, so that the organosilicon polysiloxane molecules can be more firmly adsorbed on the fiber surface. At the same time, in this way, the fluffy finishing agent can be more evenly penetrated into the interior and pores of the fabric fibers, which is beneficial to reduce the excessive accumulation of the fluffy finishing agent on the fiber surface, thereby reducing the risk of yellowing caused by uneven concentration of the fluffy finishing agent, and making the obtained recycled polyester-cotton blended fabric have higher smoothness, fluffiness and softness.

[0017] 2. In the fluffy finishing agent used in the fluffy finishing process of the present invention, when preparing the modified silicone oil, firstly, hydrogen-terminated polydimethylsiloxane and allyl glycidyl ether and glycidyl ether allyl polyoxyethylene ether are used as raw materials to prepare the modified polysiloxane intermediate, and then the modified polysiloxane intermediate is reacted with polyethyleneimine and polyetheramine to prepare the modified silicone oil. The modified silicone oil has a corresponding polyether block, and is modified by polyethyleneimine and polyetheramine at a suitable molar ratio, so that the modified silicone oil can not only improve the fluffiness of the recycled polyester-cotton blended fabric, but also be more resistant to environmental influences and can better improve the anti-yellowing performance. The modified silicone oil prepared by the present invention has high adsorption with the recycled polyester-cotton blended fabric, and can also improve the fluffiness and softness of the recycled polyester-cotton blended fabric obtained by finishing. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] The preparation method of the hydrogen-terminated polydimethylsiloxane used in the following Preparation Examples 1-3 comprises the following steps: placing octamethylcyclotetrasiloxane and 1,1,3,3-tetramethyldisiloxane in a reactor at a molar ratio of 5:1, heating to 70°C, adding 3% acidic white clay of the total mass of octamethylcyclotetrasiloxane and 1,1,3,3-tetramethyldisiloxane, and continuing to stir and react at a constant temperature for 5 hours; then cooling to room temperature, and then filtering to obtain hydrogen-terminated polydimethylsiloxane.

[0020] The preparation method of the glycidyl ether allyl polyoxyethylene ether used comprises the following steps: placing a certain amount of allyl polyoxyethylene ether 400 and epichlorohydrin in a reactor, heating to 70°C while stirring, then adding 4.0‰ of the total mass of allyl polyoxyethylene ether 400 and epichlorohydrin as catalyst NaH, reacting for 1.5 hours, removing unreacted epichlorohydrin under reduced pressure; then cooling to 35°C, adding a saturated solution of NaOH, continuing to react at 35°C for 2 hours after the addition is completed, filtering under reduced pressure, and removing water by rotary evaporation to prepare glycidyl ether allyl polyoxyethylene ether. The molar ratio of allyl polyoxyethylene ether 400, epichlorohydrin, and NaOH (NaOH in a saturated solution of NaOH) is 1:1.75:1.5.

[0021] Preparation Example 1: Preparation of modified silicone oil A method for preparing modified silicone oil comprises the following steps: (1) placing hydrogen-terminated polydimethylsiloxane, allyl glycidyl ether, and glycidyl ether allyl polyoxyethylene ether in isopropanol at a molar ratio of 1:0.8:0.35, adding chloroplatinic acid as a catalyst for reaction, the reaction temperature is 100°C, and the reaction time is 5 hours; after the reaction is completed, the isopropanol is removed by vacuum concentration to prepare a modified polysiloxane intermediate; The amount of catalyst chloroplatinic acid added is 0.003% of the mass of hydrogen-terminated polydimethylsiloxane; the mass ratio of isopropanol to hydrogen-terminated polydimethylsiloxane is 2:1.

[0022] (2) The modified polysiloxane intermediate is reacted with polyethyleneimine and polyetheramine ED600 in isopropanol for 8 hours at a temperature of 80° C. After the reaction is completed, the isopropanol is removed by concentration under reduced pressure to prepare the modified silicone oil.

[0023] The molecular weight of polyethyleneimine is 3000; the molar ratio of the modified polysiloxane intermediate to polyethyleneimine and polyetheramine ED600 is 10:2.5:0.7; and the mass of isopropanol is 3.5 times the total mass of the modified polysiloxane intermediate.

[0024] Preparation Example 2: Preparation of modified silicone oil A method for preparing modified silicone oil comprises the following steps: (1) placing hydrogen-terminated polydimethylsiloxane, allyl glycidyl ether, and glycidyl ether allyl polyoxyethylene ether in isopropanol at a molar ratio of 1:0.7:0.4, adding chloroplatinic acid as a catalyst for reaction, the reaction temperature is 110°C, and the reaction time is 3.5 hours; after the reaction is completed, the isopropanol is removed by vacuum concentration to prepare a modified polysiloxane intermediate; The amount of catalyst chloroplatinic acid added is 0.001% of the mass of hydrogen-terminated polydimethylsiloxane; the mass ratio of isopropanol to hydrogen-terminated polydimethylsiloxane is 2.5:1.

[0025] (2) The modified polysiloxane intermediate is reacted with polyethyleneimine and polyetheramine ED600 in isopropanol for 6.5 hours at a temperature of 85° C. After the reaction is completed, the isopropanol is removed by concentration under reduced pressure to prepare the modified silicone oil.

[0026] The molecular weight of polyethyleneimine is 2000; the molar ratio of the modified polysiloxane intermediate to polyethyleneimine and polyetheramine ED600 is 10:2.2:1; and the mass of isopropanol is 2.5 times the total mass of the modified polysiloxane intermediate.

[0027] Preparation Example 3: Preparation of modified silicone oil A method for preparing modified silicone oil comprises the following steps: (1) placing hydrogen-terminated polydimethylsiloxane, allyl glycidyl ether, and glycidyl ether allyl polyoxyethylene ether in isopropanol at a molar ratio of 1:0.75:0.35, adding chloroplatinic acid as a catalyst for reaction, the reaction temperature is 110°C, and the reaction time is 4 hours; after the reaction is completed, the isopropanol is removed by vacuum concentration to prepare a modified polysiloxane intermediate; The amount of catalyst chloroplatinic acid added is 0.003% of the mass of hydrogen-terminated polydimethylsiloxane; the mass ratio of isopropanol to hydrogen-terminated polydimethylsiloxane is 2.5:1.

[0028] (1) The modified polysiloxane intermediate is reacted with polyethyleneimine and polyetheramine ED900 in isopropanol for 7 hours at a temperature of 75° C. After the reaction is completed, the isopropanol is removed by concentration under reduced pressure to prepare the modified silicone oil.

[0029] The molecular weight of polyethyleneimine is 3000; the molar ratio of the modified polysiloxane intermediate to polyethyleneimine and polyetheramine ED900 is 10:2.8:0.8; and the mass of isopropanol is 3 times the total mass of the modified polysiloxane intermediate.

[0030] Embodiment 1: A low color change and fluffy finishing process for recycled polyester-cotton blended fabric, comprising the following steps: S1, prepare an aqueous solution of a fluffy finishing agent with a concentration of 0.8 g / L, an aqueous solution of a fluffy finishing agent with a concentration of 4 g / L, and an aqueous solution of a fluffy finishing agent with a concentration of 8.5 g / L; The fluffy finishing agent includes the following raw materials in weight percentage: 80% of modified silicone oil (prepared by the method in Preparation Example 1) and 20% of surfactant; the surfactant is composed of dodecyl glucoside and dodecyl dimethyl betaine in a mass ratio of 1:0.5.

[0031] S2. Soak the recycled polyester-cotton blended fabric in water at 55° C. for 2 h, and then roll the fabric, with a rolling rate of 65 wt %.

[0032] S3. The regenerated polyester-cotton blended fabric obtained by the treatment in step S2 is placed in an aqueous solution of a fluffy finishing agent for pressure impregnation, with a bath ratio of 1:15, an impregnation pressure of 0.16 MPa, a temperature of 40°C, and a time of 3 min; and then rolled and baked, with a rolling rate of 75wt%, a baking temperature of 70°C, and a baking time of 25 min.

[0033] S4. The recycled polyester-cotton blended fabric obtained by the treatment in step S3 is placed in the second aqueous solution of the fluffy finishing agent for pressure impregnation, the bath ratio is 1:10, the impregnation pressure is 0.135 MPa, the pressure impregnation temperature is 40°C, and the time is 4 minutes; then rolling and baking are performed, the rolling rate is 80wt%, the baking temperature is 70°C, and the baking time is 25 minutes.

[0034] S5. The recycled polyester-cotton blended fabric obtained by the treatment in step S4 is placed in the aqueous solution 3 of the fluffy finishing agent for pressure impregnation, the bath ratio is 1:15, the impregnation pressure is 0.123 MPa, the pressure impregnation temperature is 40°C, and the time is 10 min; then rolling and baking are performed, the rolling rate is 85wt%, and during baking, it is first baked at 85°C for 10 min, and then the temperature is raised to 145°C and baked for 1.5 min.

[0035] Embodiment 2: A low color change and fluffy finishing process for recycled polyester-cotton blended fabric, comprising the following steps: S1, prepare an aqueous solution of a fluffy finishing agent with a concentration of 0.5 g / L, an aqueous solution of a fluffy finishing agent with a concentration of 3 g / L, and an aqueous solution of a fluffy finishing agent with a concentration of 7 g / L; The fluffy finishing agent includes the following raw materials in weight percentage: 70% of modified silicone oil (prepared by the method in Preparation Example 2) and 30% of surfactant; the surfactant is composed of dodecyl glucoside and dodecyl dimethyl betaine in a mass ratio of 1:0.6.

[0036] S2. Soak the recycled polyester-cotton blended fabric in 50° C. water for 2 h, and then roll the fabric, with a rolling rate of 70 wt %.

[0037] S3. The recycled polyester-cotton blended fabric obtained by the treatment in step S2 is placed in an aqueous solution of a fluffy finishing agent for pressure impregnation, with a bath ratio of 1:12, an impregnation pressure of 0.165 MPa, a temperature of 35°C, and a time of 2 min; then rolled and baked, with a rolling rate of 75wt%, a baking temperature of 65°C, and a baking time of 30 min.

[0038] S4. The recycled polyester-cotton blended fabric obtained by the treatment in step S3 is placed in the second aqueous solution of the fluffy finishing agent for pressure impregnation, the bath ratio is 1:12, the impregnation pressure is 0.14 MPa, the pressure impregnation temperature is 35°C, and the time is 5 min; then rolling and baking are performed, the rolling rate is 80wt%, the baking temperature is 65°C, and the baking time is 30 min.

[0039] S5. The recycled polyester-cotton blended fabric obtained by the treatment in step S4 is placed in the aqueous solution 3 of the fluffy finishing agent for pressure impregnation, the bath ratio is 1:12, the impregnation pressure is 0.12 MPa, the pressure impregnation temperature is 40°C, and the time is 8 min; then rolling and baking are performed, the rolling rate is 80wt%, and during baking, first baking at 80°C for 12 min, and then heating to 135°C for 2 min.

[0040] Embodiment 3: A low color change and fluffy finishing process for recycled polyester-cotton blended fabric, comprising the following steps: S1, prepare an aqueous solution of a fluffy finishing agent with a concentration of 1g / L, an aqueous solution of a fluffy finishing agent with a concentration of 4g / L, and an aqueous solution of a fluffy finishing agent with a concentration of 9g / L; The fluffy finishing agent includes the following raw materials in weight percentage: 90% of modified silicone oil (prepared by the method in Preparation Example 3) and 10% of surfactant; the surfactant is composed of dodecyl glucoside and dodecyl dimethyl betaine in a mass ratio of 1:0.6.

[0041] S2. Soak the recycled polyester-cotton blended fabric in water at 55° C. for 1.5 h, and then roll the fabric, with the roll-off rate being 60 wt %.

[0042] S3. The regenerated polyester-cotton blended fabric obtained by the treatment in step S2 is placed in an aqueous solution of a fluffy finishing agent for pressure impregnation, with a bath ratio of 1:12, an impregnation pressure of 0.16 MPa, a temperature of 40°C, and a time of 3 min; and then rolled and baked, with a rolling rate of 80 wt%, a baking temperature of 70°C, and a baking time of 30 min.

[0043] S4. The recycled polyester-cotton blended fabric obtained by the treatment in step S3 is placed in the second aqueous solution of the fluffy finishing agent for pressure impregnation, the bath ratio is 1:10, the impregnation pressure is 0.14 MPa, the pressure impregnation temperature is 40°C, and the time is 5 min; then rolling and baking are performed, the rolling rate is 77wt%, the baking temperature is 70°C, and the baking time is 30 min.

[0044] S5. The recycled polyester-cotton blended fabric obtained by the treatment in step S4 is placed in the aqueous solution 3 of the fluffy finishing agent for pressure impregnation, the bath ratio is 1:15, the impregnation pressure is 0.125 MPa, the pressure impregnation temperature is 45°C, and the time is 9 minutes; then rolling and baking are performed, the rolling rate is 85wt%, and during baking, it is first baked at 85°C for 12 minutes, and then the temperature is raised to 140°C and baked for 2 minutes.

[0045] Embodiment 4: A low color change and fluffy finishing process for recycled polyester-cotton blended fabric, comprising the following steps: S1, prepare an aqueous solution of a fluffy finishing agent with a concentration of 0.5 g / L, an aqueous solution of a fluffy finishing agent with a concentration of 3 g / L, and an aqueous solution of a fluffy finishing agent with a concentration of 8 g / L; The fluffy finishing agent includes the following raw materials in weight percentage: 70% of modified silicone oil (prepared by the method in Preparation Example 2) and 30% of surfactant; the surfactant is composed of dodecyl glucoside and dodecyl dimethyl betaine in a mass ratio of 1:0.2.

[0046] S2. Soak the recycled polyester-cotton blended fabric in 50° C. water for 2 h, and then roll the fabric, with a rolling rate of 70 wt %.

[0047] S3. The regenerated polyester-cotton blended fabric obtained by the treatment in step S2 is placed in an aqueous solution of a fluffy finishing agent for pressure impregnation, with a bath ratio of 1:15, an impregnation pressure of 0.17 MPa, a temperature of 40°C, and a time of 2 min; and then rolled and baked, with a rolling rate of 75wt%, a baking temperature of 65°C, and a baking time of 25 min.

[0048] S4. The recycled polyester-cotton blended fabric obtained by the treatment in step S3 is placed in the second aqueous solution of the fluffy finishing agent for pressure impregnation, the bath ratio is 1:12, the impregnation pressure is 0.14 MPa, the pressure impregnation temperature is 35°C, and the time is 4 minutes; then rolling and baking are performed, the rolling rate is 75wt%, the baking temperature is 70°C, and the baking time is 27 minutes.

[0049] S5. The recycled polyester-cotton blended fabric obtained by the treatment in step S4 is placed in the aqueous solution 3 of the fluffy finishing agent for pressure impregnation, the bath ratio is 1:10, the impregnation pressure is 0.12 MPa, the pressure impregnation temperature is 40°C, and the time is 10 min; then rolling and baking are performed, the rolling rate is 80wt%, and during baking, it is first baked at 80°C for 12 min, and then the temperature is raised to 145°C and baked for 1.5 min.

[0050] Embodiment 5: A low color change and fluffy finishing process for recycled polyester-cotton blended fabric, comprising the following steps: S1, prepare an aqueous solution of a fluffy finishing agent with a concentration of 0.8 g / L, an aqueous solution of a fluffy finishing agent with a concentration of 4.5 g / L, and an aqueous solution of a fluffy finishing agent with a concentration of 7 g / L; The fluffy finishing agent includes the following raw materials in weight percentage: 80% of modified silicone oil (prepared by the method in Preparation Example 1) and 20% of surfactant; the surfactant is composed of dodecyl glucoside and dodecyl dimethyl betaine in a mass ratio of 1:0.6.

[0051] S2. Soak the recycled polyester-cotton blended fabric in water at 55° C. for 2 h, and then roll the fabric, with a rolling rate of 65 wt %.

[0052] S3. The recycled polyester-cotton blended fabric obtained by the treatment in step S2 is placed in an aqueous solution of a fluffy finishing agent for pressure impregnation, with a bath ratio of 1:10, an impregnation pressure of 0.17 MPa, a temperature of 35°C, and a time of 3 min; then rolled and baked, with a rolling rate of 80wt%, a baking temperature of 65°C, and a baking time of 30 min.

[0053] S4. The recycled polyester-cotton blended fabric obtained by the treatment in step S3 is placed in the second aqueous solution of the fluffy finishing agent for pressure impregnation, the bath ratio is 1:15, the impregnation pressure is 0.135 MPa, the pressure impregnation temperature is 38°C, and the time is 6 min; then rolling and baking are performed, the rolling rate is 80wt%, the baking temperature is 65°C, and the baking time is 25 min.

[0054] S5. The recycled polyester-cotton blended fabric obtained by the treatment in step S4 is placed in the aqueous solution 3 of the fluffy finishing agent for pressure impregnation, the bath ratio is 1:15, the impregnation pressure is 0.125 MPa, the pressure impregnation temperature is 45°C, and the time is 8 min; then rolling and baking are performed, the rolling rate is 82wt%, and during baking, it is first baked at 80°C for 12 min, and then the temperature is raised to 135°C and baked for 2 min.

[0055] Comparative Example 1: A low color change and fluffy finishing process for recycled polyester-cotton blended fabric, comprising the following steps: S1, prepare an aqueous solution of a fluffy finishing agent with a concentration of 7 g / L; The fluffy finishing agent includes the following raw materials in weight percentage: 80% of modified silicone oil (prepared by the method in Preparation Example 1) and 20% of surfactant; the surfactant is composed of dodecyl glucoside and dodecyl dimethyl betaine in a mass ratio of 1:0.6.

[0056] S2. Soak the recycled polyester-cotton blended fabric in water at 55° C. for 2 h, and then roll the fabric, with a rolling rate of 65 wt %.

[0057] S3. The recycled polyester-cotton blended fabric obtained by the treatment in step S2 is placed in an aqueous solution of a fluffy finishing agent for pressure impregnation, with a bath ratio of 1:15, an impregnation pressure of 0.125 MPa, a pressure impregnation temperature of 45°C, and a time of 25 min; then rolled and baked, with a rolling rate of 82wt%. During baking, first bake at 80°C for 12 min, then heat to 135°C and bake for 2 min.

[0058] Comparative Example 2: Different from Comparative Example 1, the impregnation pressure was 0.135 MPa.

[0059] Comparative Example 3: Different from Comparative Example 1, the impregnation pressure was 0.17 MPa.

[0060] Comparative Example 4: Different from Comparative Example 1, the impregnation pressure is normal pressure and the impregnation time is 60 minutes.

[0061] Comparative Example 5: A low color change and fluffy finishing process for recycled polyester-cotton blended fabric, comprising the following steps: S1, prepare an aqueous solution of a fluffy finishing agent with a concentration of 0.8 g / L, an aqueous solution of a fluffy finishing agent with a concentration of 4.5 g / L, and an aqueous solution of a fluffy finishing agent with a concentration of 7 g / L; The fluffy finishing agent includes the following raw materials in weight percentage: 80% of modified silicone oil (prepared by the method in Preparation Example 1) and 20% of surfactant; the surfactant is composed of dodecyl glucoside and dodecyl dimethyl betaine in a mass ratio of 1:0.6.

[0062] S2. Soak the recycled polyester-cotton blended fabric in water at 55° C. for 2 h, and then roll the fabric, with a rolling rate of 65 wt %.

[0063] S3. The regenerated polyester-cotton blended fabric obtained by the treatment in step S2 is placed in an aqueous solution of a fluffy finishing agent for immersion at normal pressure, with a bath ratio of 1:10, a temperature of 35°C, and a time of 20 min; and then rolled and baked, with a rolling rate of 80wt%, a baking temperature of 65°C, and a baking time of 30 min.

[0064] S4. The recycled polyester-cotton blended fabric obtained by the treatment in step S3 is placed in the second aqueous solution of the fluffy finishing agent for immersion at normal pressure, with a bath ratio of 1:15, an immersion temperature of 38°C, and a time of 20 minutes; then rolled and baked, with a rolling rate of 80wt%, a baking temperature of 65°C, and a baking time of 25 minutes.

[0065] S5. The recycled polyester-cotton blended fabric obtained by the treatment in step S4 is placed in the aqueous solution 3 of the fluffy finishing agent for impregnation at normal pressure, with a bath ratio of 1:15, an immersion temperature of 45°C, and a time of 20 minutes; then rolled and baked, with a rolling rate of 82wt%. During baking, first bake at 80°C for 12 minutes, then heat to 135°C and bake for 2 minutes.

[0066] Comparative Example 6: Different from Example 5, the preparation method of the modified silicone oil comprises the following steps: (1) placing hydrogen-terminated polydimethylsiloxane and allyl glycidyl ether in isopropanol at a molar ratio of 1:1.15, adding chloroplatinic acid as a catalyst for reaction, the reaction temperature is 100°C, and the reaction time is 5 hours; after the reaction is completed, the isopropanol is removed by vacuum concentration to prepare a modified polysiloxane intermediate; The amount of the catalyst added is 0.003% of the mass of the hydrogen-terminated polydimethylsiloxane; the mass ratio of isopropanol to hydrogen-terminated polydimethylsiloxane is 2:1.

[0067] (2) The modified polysiloxane intermediate is reacted with polyethyleneimine and polyetheramine ED600 in isopropanol for 8 hours at a temperature of 80° C. After the reaction is completed, the isopropanol is removed by concentration under reduced pressure to prepare the modified silicone oil.

[0068] The molecular weight of polyethyleneimine is 3000; the molar ratio of the modified polysiloxane intermediate to polyethyleneimine and polyetheramine ED600 is 10:2.5:0.7; and the mass of isopropanol is 3.5 times the total mass of the modified polysiloxane intermediate.

[0069] Comparative Example 7: Different from Example 5, the preparation method of the modified silicone oil comprises the following steps: (1) placing hydrogen-terminated polydimethylsiloxane, allyl glycidyl ether, and glycidyl ether allyl polyoxyethylene ether in isopropanol at a molar ratio of 1:0.8:0.35, adding chloroplatinic acid as a catalyst for reaction, the reaction temperature is 100°C, and the reaction time is 5 hours; after the reaction is completed, the isopropanol is removed by vacuum concentration to prepare a modified polysiloxane intermediate; The amount of the catalyst added is 0.003% of the mass of the hydrogen-terminated polydimethylsiloxane; the mass ratio of isopropanol to hydrogen-terminated polydimethylsiloxane is 2:1.

[0070] (2) reacting the modified polysiloxane intermediate with polyethyleneimine in isopropanol for 8 hours at a temperature of 80° C. After the reaction, the isopropanol is removed by concentration under reduced pressure to prepare the modified silicone oil.

[0071] The molecular weight of polyethyleneimine is 3000; the molar ratio of the modified polysiloxane intermediate to polyethyleneimine is 10:3.2; and the mass of isopropanol is 3.5 times the total mass of the modified polysiloxane intermediate.

[0072] Performance Testing: The total color difference (△E*) and whiteness change (△Wi) of recycled polyester-cotton blended fabric before and after the low color change and fluffy finishing process were tested. The fluffiness level was evaluated using a 1-5 level evaluation method, with 5 being the best. The softness score was also evaluated, with a full score of 10. The specific test results are shown in Table 1.

[0073] Table 1: △E* △Wi Fluffiness / Grade Softness / min Example 1 0.21 0.34 4.5 9 Example 2 0.23 0.38 4.5 9 Example 3 0.19 0.32 4.5 9.5 Example 4 0.24 0.37 4.5 9 Example 5 0.21 0.35 4.5 9.5 Comparative Example 1 0.33 0.49 4 8 Comparative Example 2 0.31 0.46 3.5 7.5 Comparative Example 3 0.38 0.54 3 7 Comparative Example 4 0.35 0.49 4 8 Comparative Example 5 0.28 0.43 4 8.5 Comparative Example 6 0.28 0.45 4 8.5 Comparative Example 7 0.29 0.43 4 8.5 It can be seen from Table 1 that the regenerated polyester-cotton blended fabric produced by the fluffy finishing process of the present invention has high fluffiness and softness, and low total color difference value and whiteness change value.

[0074] From the comparison between Example 5 and Comparative Examples 1-4, it can be seen that the use of aqueous solutions of the bulking finishing agent with increasing concentrations for finishing and pressure impregnation with appropriate pressure during each finishing can improve the fluffiness and softness, and reduce the total color difference value and whiteness change value, compared with one-time pressure impregnation and one-time normal pressure impregnation.

[0075] From the comparison between Example 5 and Comparative Example 5, it can be seen that when the aqueous solution of the fluffy finishing agent with increasing concentration is used for finishing, the pressure impregnation with appropriate pressure can improve the fluffiness and softness, and reduce the total color difference value and whiteness change value. Compared with the one-time normal pressure impregnation, from Comparative Example 5 to Comparative Example 4, the aqueous solution of the fluffy finishing agent with increasing concentration is used for finishing, which can improve the softness, and reduce the total color difference value and whiteness change value.

[0076] By comparing Example 5 and Comparative Examples 6-7, it can be seen that when preparing modified silicone oil, using allyl glycidyl ether, glycidyl ether allyl polyoxyethylene ether and hydrogen-terminated polydimethylsiloxane in an appropriate molar ratio to react, and using polyethyleneimine and polyetheramine ED600 and modified polysiloxane intermediates in an appropriate molar ratio to react, the fluffy finishing effect can also be better.

[0077] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low color change and fluffy finishing process for recycled polyester-cotton blended fabric, characterized in that: The following steps are involved: S1, prepare an aqueous solution of a fluffy finishing agent with a concentration of 0.5-1g / L, an aqueous solution of a fluffy finishing agent with a concentration of 3-4.5g / L, and an aqueous solution of a fluffy finishing agent with a concentration of 7-9g / L; The fluffy finishing agent includes the following raw materials in weight percentage: modified silicone oil 70-90%, surfactant 10-30%; S2, soaking the recycled polyester-cotton blended fabric in water at 50-55°C for 1.5-2h, and then rolling it; S3, placing the regenerated polyester-cotton blended fabric obtained by the treatment in step S2 in an aqueous solution of a fluffy finishing agent for pressure impregnation at a pressure of 0.16-0.17 MPa, and then rolling and baking; S4, placing the regenerated polyester-cotton blended fabric obtained by the treatment in step S3 in the second aqueous solution of the fluffy finishing agent for pressure impregnation, the impregnation pressure is 0.135-0.14MPa, and then rolling and baking; S5. The regenerated polyester-cotton blended fabric obtained by the treatment in step S4 is placed in the aqueous solution 3 of the bulking finishing agent for pressure impregnation at a pressure of 0.12-0.125 MPa, and then rolled and baked.

2. The low color change and fluffy finishing process of recycled polyester-cotton blended fabric according to claim 1, characterized in that: In step S3, the pressure impregnation temperature is 35-40°C and the time is 2-3 minutes; in step S4, the pressure impregnation temperature is 35-40°C and the time is 4-6 minutes; in step S5, the pressure impregnation temperature is 40-45°C and the time is 8-10 minutes.

3. The low color change and fluffy finishing process of recycled polyester-cotton blended fabric according to claim 1, characterized in that: In step S2, the rolling ratio is 60-70wt%; in step S3, the bath ratio is 1:10-15, the rolling ratio is 75-80wt%, the baking temperature is 65-70°C, and the baking time is 25-30min; in step S4, the bath ratio is 1:10-15, the rolling ratio is 75-80wt%, the baking temperature is 65-70°C, and the baking time is 25-30min; in step S5, the rolling ratio is 80-85wt%, the bath ratio is 1:10-15, and during the baking, the mixture is first baked at 80-85°C for 10-12min, and then heated to 135-145°C for 1.5-2min.

4. The low color change and fluffy finishing process of recycled polyester-cotton blended fabric according to claim 1, characterized in that: The preparation method of the modified silicone oil comprises the following steps: (1) placing hydrogen-terminated polydimethylsiloxane, allyl glycidyl ether, and glycidyl ether allyl polyoxyethylene ether in isopropanol, and adding a catalyst to react; after the reaction is completed, concentrating under reduced pressure to remove the isopropanol, and preparing a modified polysiloxane intermediate; (2) The modified polysiloxane intermediate is reacted with polyethyleneimine and polyetheramine in isopropanol. After the reaction is completed, the isopropanol is removed by concentration under reduced pressure to prepare the modified silicone oil.

5. The low color change and fluffy finishing process of recycled polyester-cotton blended fabric according to claim 4, characterized in that: In step (1), the molar ratio of the hydrogen-terminated polydimethylsiloxane to allyl glycidyl ether and glycidyl ether allyl polyoxyethylene ether is 1:0.7-0.8:0.35-0.4; The catalyst is chloroplatinic acid; the amount of the catalyst added is 0.001-0.003% of the mass of the hydrogen-terminated polydimethylsiloxane.

6. The low color change and fluffy finishing process of recycled polyester-cotton blended fabric according to claim 4, characterized in that: In step (1), the reaction temperature is 100-110°C and the reaction time is 3.5-5h; The mass ratio of the isopropanol to the hydrogen-terminated polydimethylsiloxane is 2-2.5:

1.

7. The low color change and fluffy finishing process of recycled polyester-cotton blended fabric according to claim 4, characterized in that: In step (2), the molar ratio of the modified polysiloxane intermediate to polyethyleneimine and polyetheramine is 10:2.2-2.8:0.7-1; The molecular weight of the polyethyleneimine is 2000-3000; the polyetheramine is one or more of polyetheramine ED600 and polyetheramine ED900.

8. The low color change and fluffy finishing process of recycled polyester-cotton blended fabric according to claim 4, characterized in that: In step (2), the reaction time is 6.5-8 hours, the reaction temperature is 75-85° C., and the mass of the isopropanol is 2.5-3.5 times the total mass of the modified polysiloxane intermediate.

9. The low color change and fluffy finishing process of recycled polyester-cotton blended fabric according to claim 4, characterized in that: In step (1), the method for preparing hydrogen-terminated polydimethylsiloxane comprises the following steps: using octamethylcyclotetrasiloxane and 1,1,3,3-tetramethyldisiloxane as raw materials, and preparing hydrogen-terminated polydimethylsiloxane under the catalytic action of acidic white clay; the molar ratio of octamethylcyclotetrasiloxane to 1,1,3,3-tetramethyldisiloxane is 5-5.5:1; The preparation method of glycidyl ether allyl polyoxyethylene ether comprises the following steps: taking allyl polyoxyethylene ether and epichlorohydrin as raw materials, generating an allyl polyoxyethylene chlorohydrin ether intermediate through a ring-opening reaction under the catalytic action of NaH, and then performing a ring-closing reaction under the action of NaOH to prepare glycidyl ether allyl polyoxyethylene ether; the molar ratio of the allyl polyoxyethylene ether to the epichlorohydrin is 1:1.7-2.

10. The low color change and fluffy finishing process of recycled polyester-cotton blended fabric according to any one of claims 1 to 9, characterized in that: The surfactant is composed of dodecyl glucoside and dodecyl dimethyl betaine in a mass ratio of 1:0.2-0.6.