Method for carrying out flame-retardant finishing on copper ammonia fabric by using barley bran extract

Abstract

The invention provides a method for performing flame-retardant finishing on a copper ammonia fabric by using a barley bran extract, the flame-retardant finishing method is as follows: a core-shell structure flame retardant is loaded to the surface of the copper ammonia fabric through a padding process, the core-shell structure flame retardant takes polyguanidine and sodium alginate as a shell layer and takes the barley bran extract as a core layer, and the core layer is a shell layer; the polyguanidine and the sodium alginate are combined through self-assembly. The barley bran used in the invention is a by-product of barley processing, efficient utilization of resources is realized through processing of the barley bran, use of halogen in a traditional flame retardant is avoided, and the method has the characteristic of environmental friendliness.

Description

Technical Field

[0001] The invention relates to the technical field of functional fabric finishing, and in particular to the flame retardant application of a barley bran extract. Background Art

[0002] In recent years, my country's economy and technology have developed rapidly, and people's requirements for the functionality of textile fabrics have continued to increase. At present, most textile fabrics are flammable or flammable fabrics, which have the disadvantages of being flammable, having a high flame spread rate when burning, and having high smoke toxicity, which brings huge fire risks and limits the application of polymer materials, which poses a serious threat to people's lives and property safety. At present, the methods for preparing flame-retardant fabrics mainly include copolymerization, blending, composite spinning flame retardant modification, and finishing. Among these methods, the finishing method has relatively small restrictions on the thermal stability of flame retardant additives and the size of condensed particles, and the process is simple and the cost is low, which can meet different degrees of flame retardancy requirements. Halogen flame retardants are widely used due to their low cost and good performance, but they pollute the environment and damage the ecology, and are now gradually banned. The use of bio-based resources to prepare halogen-free flame retardant additives has become a new development trend. Plant extract flame retardants can significantly inhibit the release of smoke and heat from materials through the condensation carbonization mechanism, thereby improving the safety of materials. Cuprammonia fabric is an environmentally friendly textile fabric made of cuprammonia fiber. The raw material of cuprammonia fiber is the short fluff of cotton seeds, which is easily decomposed by bacteria in soil and water. It does not release toxic gases when burned, and waste is easily decomposed, so it has environmental protection performance. However, cuprammonia fabric does not have flame retardant properties. It is easy to burn and burn quickly when encountering a fire, so it needs to be flame retardant finished. Summary of the invention

[0003] Technical problem to be solved: The present invention provides a method for flame retardant finishing of cuprammonia fabric using barley bran extract, and flame retardancy is achieved by loading barley bran extract on the surface of cuprammonia fabric.

[0004] Technical solution: A method for flame retardant finishing of cuprammonia fabric using barley bran extract, the flame retardant finishing method comprises loading a core-shell structure flame retardant onto the surface of the cuprammonia fabric through a padding process, the core-shell structure flame retardant has polyguanidine and sodium alginate as a shell layer and barley bran extract as a core layer, and the polyguanidine and sodium alginate are combined by self-assembly. Preferably, the flame retardant finishing method comprises the following steps: S1. The core-shell flame retardant is added to water and stirred to obtain a flame retardant finishing liquid; S2. Immerse the cuprammonia fabric in the flame retardant finishing liquid obtained in S1, and obtain the flame retardant cuprammonia fabric after two immersions and two rollings and drying. Preferably, the preparation method of the core-shell structure flame retardant in S1 comprises the following steps: S11. adding the barley bran extract to water and dispersing it by ultrasonication to obtain a suspension A having a mass fraction of 10 to 25 wt %; S12. Add sodium alginate to water and stir to obtain a solution B having a mass fraction of 0.1 to 0.8 wt %; S13. Adding polyguanidine to water and stirring to obtain a solution C having a mass fraction of 0.1 to 0.8 wt %; S14. adding solution C to suspension A, stirring for 30 to 60 min and centrifuging and washing to obtain barley bran@polyguanidine; S15. Add barley bran@polyguanidine to water to obtain a solution D with a mass fraction of 8 to 10 wt%, add solution B under stirring conditions, and obtain a core-shell structure flame retardant after centrifugal washing. Preferably, the mass fraction of the flame retardant finishing liquid in S1 is 20-40wt%. Preferably, the bath ratio of the cuprammonia fabric and the flame retardant finishing liquid in S2 is 1:20-40. Preferably, the single dipping time of the double dipping and double rolling in S2 is 40 to 90 seconds, and the rolling rate is 70 to 80%. Preferably, the drying temperature in S2 is 100-160° C., and the drying time is 10-30 min. Preferably, the volume ratio of solution C to suspension A in S14 is 1:1-3. Preferably, the volume ratio of solution D to solution B in S15 is 2-3:1-2. Preferably, the number of layers of the core-shell structure flame retardant can be controlled by repeating S15 for a number of times. Beneficial effects: The present invention has the following advantages: 1. The core-shell flame retardant of the present invention uses barley bran extract as the core layer. The barley bran extract contains polyphenols. The polyphenols provide hydrogen atoms in phenolic hydroxyl groups to free radicals through a hydrogen atom transfer mechanism to generate stable substances and phenoxy free radicals. This process destroys the chain reaction in the combustion process and prevents oxidation. In addition, the polyphenols can promote the formation of a carbon layer during pyrolysis. This carbon layer can serve as a barrier to slow down the transfer of heat and oxygen into the material, thereby improving the flame retardant properties of the material. 2. The core-shell flame retardant of the present invention uses polyguanidine and sodium alginate as the shell layer. Polyguanidine releases non-combustible gases when it is decomposed by heat. These gases help to block the chain reaction of combustion. Moreover, due to their generation and the absorption of heat by the flame retardant decomposition, most of the heat is taken away, which greatly reduces the temperature of the surface of the cuprammonia fabric. In addition, a stable carbon layer can be formed during the combustion of sodium alginate. This carbon layer can isolate oxygen and heat, slow down the further combustion of the material, and thus improve the flame retardant performance of the fabric. 3. In the present invention, water is used as the assembly medium, the aqueous solution of polyguanidine is positively charged, and the aqueous solution of sodium alginate is negatively charged. According to the different electrical properties, a flame retardant with a core-shell structure is prepared by assembling layer by layer, and the number of core layers is controllable. The synergistic effect of the core layer and the shell layer is utilized to jointly improve the flame retardant properties of the fabric; 4. The barley bran used in the present invention is a by-product of barley processing. The processing of barley bran achieves efficient utilization of resources, avoids the use of halogens in traditional flame retardants, and has environmentally friendly characteristics. DETAILED DESCRIPTION The present invention will be further described below in conjunction with embodiments, which are explanations of the present invention and are not limited to the following embodiments: Example 1 A method for flame retardant finishing of cuprammonia fabric using barley bran extract, wherein the flame retardant finishing method comprises loading a core-shell structure flame retardant onto the surface of the cuprammonia fabric through a padding process, wherein the core-shell structure flame retardant comprises polyguanidine and sodium alginate as a shell layer and barley bran extract as a core layer, and the polyguanidine and sodium alginate are combined by self-assembly; Wherein, the flame retardant finishing method comprises the following steps: S1. The core-shell flame retardant is added to water and stirred to obtain a flame retardant finishing liquid having a mass fraction of 20wt%; S2. The cuprammonia fabric is immersed in the flame retardant finishing liquid obtained in S1, the bath ratio of the cuprammonia fabric and the flame retardant finishing liquid is 1:20, and a two-immersion and two-rolling process is adopted. The single immersion time of the two-immersion and two-rolling is 40s, and the rolling rate is 70%. Then, the cuprammonia fabric is dried at 100°C for 10 minutes to obtain a flame retardant cuprammonia fabric. The preparation method of the core-shell flame retardant in S1 comprises the following steps: S11. adding the barley bran extract to water and dispersing it by ultrasonication to obtain a suspension A having a mass fraction of 10 wt %; S12. Add sodium alginate to water and stir to obtain a solution B with a mass fraction of 0.1 wt %; S13. Adding polyguanidine to water and stirring to obtain a solution C having a mass fraction of 0.1 wt %; S14. adding solution C to suspension A, the volume ratio of solution C to suspension A being 1:1, stirring for 30 min and centrifuging and washing to obtain barley bran@polyguanidine; S15. Add barley bran@polyguanidine to water to obtain a solution D with a mass fraction of 8 wt%, add solution B under stirring, the volume ratio of solution D to solution B is 2:1, and obtain a core-shell structure flame retardant after centrifugal washing. Example 2 A method for flame retardant finishing of cuprammonia fabric using barley bran extract, wherein the flame retardant finishing method comprises loading a core-shell structure flame retardant onto the surface of the cuprammonia fabric through a padding process, wherein the core-shell structure flame retardant comprises polyguanidine and sodium alginate as a shell layer and barley bran extract as a core layer, and the polyguanidine and sodium alginate are combined by self-assembly; Wherein, the flame retardant finishing method comprises the following steps: S1. The core-shell flame retardant is added to water and stirred to obtain a flame retardant finishing liquid having a mass fraction of 40wt%; S2. The copper ammonia fabric is immersed in the flame retardant finishing liquid obtained in S1, the bath ratio of the copper ammonia fabric and the flame retardant finishing liquid is 1:40, and a two-immersion and two-rolling process is adopted. The single immersion time of the two-immersion and two-rolling is 90s, and the rolling rate is 80%. Then, the copper ammonia fabric is dried at 160°C for 30 minutes to obtain a flame retardant copper ammonia fabric. The preparation method of the core-shell flame retardant in S1 comprises the following steps: S11. adding the barley bran extract to water and dispersing it by ultrasonication to obtain a suspension A having a mass fraction of 25 wt %; S12. Add sodium alginate to water and stir to obtain a solution B with a mass fraction of 0.8 wt %; S13. The polyguanidine was added to water and stirred to obtain a solution C having a mass fraction of 0.8 wt %; S14. adding solution C to suspension A, the volume ratio of solution C to suspension A being 1:3, stirring for 60 min and centrifuging and washing to obtain barley bran@polyguanidine; S15. Add barley bran@polyguanidine to water to obtain a solution D with a mass fraction of 10 wt%, add solution B under stirring, the volume ratio of solution D to solution B is 3:2, and obtain a core-shell structure flame retardant after centrifugal washing. Example 3 A method for flame retardant finishing of cuprammonia fabric using barley bran extract, wherein the flame retardant finishing method comprises loading a core-shell structure flame retardant onto the surface of the cuprammonia fabric through a padding process, wherein the core-shell structure flame retardant comprises polyguanidine and sodium alginate as a shell layer and barley bran extract as a core layer, and the polyguanidine and sodium alginate are combined by self-assembly; Wherein, the flame retardant finishing method comprises the following steps: S1. The core-shell flame retardant is added to water and stirred to obtain a flame retardant finishing liquid having a mass fraction of 25wt%; S2. The copper ammonia fabric is immersed in the flame retardant finishing liquid obtained in S1, the bath ratio of the copper ammonia fabric and the flame retardant finishing liquid is 1:30, and a two-immersion and two-rolling process is adopted. The single immersion time of the two-immersion and two-rolling is 90s, and the liquid rolling rate is 75%. Then, the copper ammonia fabric is dried at 140°C for 20min to obtain a flame retardant copper ammonia fabric. After the impregnation, the copper-ammonia fabric is baked at 160° C. for 30 minutes to obtain a flame-retardant copper-ammonia fabric. The preparation method of the core-shell flame retardant in S1 comprises the following steps: S11. adding the barley bran extract to water and dispersing it by ultrasonication to obtain a suspension A having a mass fraction of 25 wt %; S12. Add sodium alginate to water and stir to obtain a solution B with a mass fraction of 0.7 wt %; S13. The polyguanidine was added to water and stirred to obtain a solution C having a mass fraction of 0.8 wt %; S14. adding solution C to suspension A, the volume ratio of solution C to suspension A being 1:2, stirring for 60 min and centrifuging and washing to obtain barley bran@polyguanidine; S15. Add barley bran@polyguanidine to water to obtain a solution D with a mass fraction of 10 wt%, add solution B under stirring, the volume ratio of solution D to solution B is 3:1.5, and obtain a core-shell structure flame retardant after centrifugal washing. Example 4 A method for flame retardant finishing of cuprammonia fabric using barley bran extract, wherein the flame retardant finishing method comprises loading a core-shell structure flame retardant onto the surface of the cuprammonia fabric through a padding process, wherein the core-shell structure flame retardant comprises polyguanidine and sodium alginate as a shell layer and barley bran extract as a core layer, and the polyguanidine and sodium alginate are combined by self-assembly; Wherein, the flame retardant finishing method comprises the following steps: S1. The core-shell flame retardant is added to water and stirred to obtain a flame retardant finishing liquid having a mass fraction of 30wt%; S2. The copper ammonia fabric is immersed in the flame retardant finishing liquid obtained in S1, the bath ratio of the copper ammonia fabric and the flame retardant finishing liquid is 1:20, and a two-immersion and two-rolling process is adopted. The single immersion time of the two-immersion and two-rolling is 50s, and the rolling rate is 80%. Then, the copper ammonia fabric is dried at 160°C for 30min to obtain a flame retardant copper ammonia fabric. After the impregnation, the copper-ammonia fabric is baked at 120° C. for 30 minutes to obtain a flame-retardant copper-ammonia fabric. The preparation method of the core-shell flame retardant in S1 comprises the following steps: S11. The barley bran extract was added to water and ultrasonically dispersed to obtain a suspension A having a mass fraction of 15 wt %; S12. Add sodium alginate to water and stir to obtain a solution B with a mass fraction of 0.6 wt %; S13. The polyguanidine was added to water and stirred to obtain a solution C having a mass fraction of 0.8 wt %; S14. adding solution C to suspension A, the volume ratio of solution C to suspension A being 1:3, stirring for 60 min and centrifuging and washing to obtain barley bran@polyguanidine; S15. Add barley bran@polyguanidine to water to obtain a solution D with a mass fraction of 10 wt%, add solution B under stirring, the volume ratio of solution D to solution B is 3:2, and obtain a core-shell structure flame retardant after centrifugal washing. Example 5 A method for flame retardant finishing of cuprammonia fabric using barley bran extract, wherein the flame retardant finishing method comprises loading a core-shell structure flame retardant onto the surface of the cuprammonia fabric through a padding process, wherein the core-shell structure flame retardant comprises polyguanidine and sodium alginate as a shell layer and barley bran extract as a core layer, and the polyguanidine and sodium alginate are combined by self-assembly; Wherein, the flame retardant finishing method comprises the following steps: S1. The core-shell flame retardant is added to water and stirred to obtain a flame retardant finishing liquid having a mass fraction of 30wt%; S2. The copper ammonia fabric is immersed in the flame retardant finishing liquid obtained in S1, the bath ratio of the copper ammonia fabric and the flame retardant finishing liquid is 1:25, and a two-immersion and two-rolling process is adopted. The single immersion time of the two-immersion and two-rolling is 60s, and the rolling rate is 80%. Then, the copper ammonia fabric is dried at 160°C for 30min to obtain a flame retardant copper ammonia fabric. After the impregnation, the copper-ammonia fabric is baked at 160° C. for 20 minutes to obtain a flame-retardant copper-ammonia fabric. The preparation method of the core-shell flame retardant in S1 comprises the following steps: S11. The barley bran extract was added to water and ultrasonically dispersed to obtain a suspension A having a mass fraction of 12 wt %; S12. Add sodium alginate to water and stir to obtain a solution B with a mass fraction of 0.6 wt %; S13. The polyguanidine was added to water and stirred to obtain a solution C having a mass fraction of 0.8 wt %; S14. adding solution C to suspension A, the volume ratio of solution C to suspension A being 1:3, stirring for 40 min and centrifuging and washing to obtain barley bran@polyguanidine; S15. Add barley bran@polyguanidine to water to obtain a solution D with a mass fraction of 9 wt%, add solution B under stirring, the volume ratio of solution D to solution B is 3:2, and obtain a core-shell structure flame retardant after centrifugal washing. Example 6 A method for flame retardant finishing of cuprammonia fabric using barley bran extract, wherein the flame retardant finishing method comprises loading a core-shell structure flame retardant onto the surface of the cuprammonia fabric through a padding process, wherein the core-shell structure flame retardant comprises polyguanidine and sodium alginate as a shell layer and barley bran extract as a core layer, and the polyguanidine and sodium alginate are combined by self-assembly; Wherein, the flame retardant finishing method comprises the following steps: S1. The core-shell flame retardant is added to water and stirred to obtain a flame retardant finishing liquid having a mass fraction of 30wt%; S2. The copper ammonia fabric is immersed in the flame retardant finishing liquid obtained in S1, the bath ratio of the copper ammonia fabric and the flame retardant finishing liquid is 1:35, and a two-immersion and two-rolling process is adopted. The single immersion time of the two-immersion and two-rolling is 60s, and the rolling rate is 80%. Then, the copper ammonia fabric is dried at 160°C for 30min to obtain a flame retardant copper ammonia fabric. The preparation method of the core-shell flame retardant in S1 comprises the following steps: S11. adding the barley bran extract to water and dispersing it by ultrasonication to obtain a suspension A having a mass fraction of 25 wt %; S12. Add sodium alginate to water and stir to obtain a solution B with a mass fraction of 0.6 wt %; S13. Adding polyguanidine to water and stirring to obtain a solution C having a mass fraction of 0.7 wt %; S14. adding solution C to suspension A, the volume ratio of solution C to suspension A being 1:3, stirring for 60 min and centrifuging and washing to obtain barley bran@polyguanidine; S15. Add barley bran@polyguanidine to water to obtain a solution D with a mass fraction of 10 wt%, add solution B under stirring, the volume ratio of solution D to solution B is 3:2, and obtain a core-shell structure flame retardant after centrifugal washing. Example 7 A method for flame retardant finishing of cuprammonia fabric using barley bran extract, wherein the flame retardant finishing method comprises loading a core-shell structure flame retardant onto the surface of the cuprammonia fabric through a padding process, wherein the core-shell structure flame retardant comprises polyguanidine and sodium alginate as a shell layer and barley bran extract as a core layer, and the polyguanidine and sodium alginate are combined by self-assembly; Wherein, the flame retardant finishing method comprises the following steps: S1. The core-shell flame retardant is added to water and stirred to obtain a flame retardant finishing liquid having a mass fraction of 30wt%; S2. The copper ammonia fabric is immersed in the flame retardant finishing liquid obtained in S1, the bath ratio of the copper ammonia fabric and the flame retardant finishing liquid is 1:40, and a two-immersion and two-rolling process is adopted. The single immersion time of the two-immersion and two-rolling is 90s, and the rolling rate is 80%. Then, the copper ammonia fabric is dried at 140°C for 25min to obtain a flame retardant copper ammonia fabric. The preparation method of the core-shell flame retardant in S1 comprises the following steps: S11. adding the barley bran extract to water and dispersing it by ultrasonication to obtain a suspension A having a mass fraction of 25 wt %; S12. Add sodium alginate to water and stir to obtain a solution B with a mass fraction of 0.2 wt %; S13. The polyguanidine was added to water and stirred to obtain a 0.8 wt % solution C; S14. adding solution C to suspension A, the volume ratio of solution C to suspension A being 1:3, stirring for 60 min and centrifuging and washing to obtain barley bran@polyguanidine; S15. Add barley bran@polyguanidine to water to obtain a solution D with a mass fraction of 10 wt%, add solution B under stirring, the volume ratio of solution D to solution B is 2:2, and obtain a core-shell structure flame retardant after centrifugal washing. Example 8 A method for flame retardant finishing of cuprammonia fabric using barley bran extract, wherein the flame retardant finishing method comprises loading a core-shell structure flame retardant onto the surface of the cuprammonia fabric through a padding process, wherein the core-shell structure flame retardant comprises polyguanidine and sodium alginate as a shell layer and barley bran extract as a core layer, and the polyguanidine and sodium alginate are combined by self-assembly; Wherein, the flame retardant finishing method comprises the following steps: S1. The core-shell flame retardant is added to water and stirred to obtain a flame retardant finishing liquid having a mass fraction of 22wt%; S2. The copper ammonia fabric is immersed in the flame retardant finishing liquid obtained in S1, the bath ratio of the copper ammonia fabric and the flame retardant finishing liquid is 1:30, and a two-immersion and two-rolling process is adopted. The single immersion time of the two-immersion and two-rolling is 90s, and the liquid rolling rate is 76%. Then, the copper ammonia fabric is dried at 150°C for 30 minutes to obtain a flame retardant copper ammonia fabric. The preparation method of the core-shell flame retardant in S1 comprises the following steps: S11. adding the barley bran extract to water and dispersing it by ultrasonication to obtain a suspension A having a mass fraction of 25 wt %; S12. Add sodium alginate to water and stir to obtain a solution B with a mass fraction of 0.8 wt %; S13. Adding polyguanidine to water and stirring to obtain a solution C having a mass fraction of 0.6 wt %; S14. adding solution C to suspension A, the volume ratio of solution C to suspension A being 1:3, stirring for 60 min and centrifuging and washing to obtain barley bran@polyguanidine; S15. Add barley bran@polyguanidine to water to obtain a solution D with a mass fraction of 10 wt%, add solution B under stirring, the volume ratio of solution D to solution B is 3:2, and obtain a core-shell structure flame retardant after centrifugal washing. Example 9 A method for flame retardant finishing of cuprammonia fabric using barley bran extract, wherein the flame retardant finishing method comprises loading a core-shell structure flame retardant onto the surface of the cuprammonia fabric through a padding process, wherein the core-shell structure flame retardant comprises polyguanidine and sodium alginate as a shell layer and barley bran extract as a core layer, and the polyguanidine and sodium alginate are combined by self-assembly; Wherein, the flame retardant finishing method comprises the following steps: S1. The core-shell flame retardant is added to water and stirred to obtain a flame retardant finishing liquid having a mass fraction of 20wt%; S2. The copper ammonia fabric is immersed in the flame retardant finishing liquid obtained in S1, the bath ratio of the copper ammonia fabric and the flame retardant finishing liquid is 1:25, and a two-immersion and two-rolling process is adopted. The single immersion time of the two-immersion and two-rolling is 90s, and the liquid rolling rate is 80%. Then, the copper ammonia fabric is dried at 130°C for 30 minutes to obtain a flame retardant copper ammonia fabric. The preparation method of the core-shell flame retardant in S1 comprises the following steps: S11. The barley bran extract was added to water and dispersed by ultrasonic to obtain a suspension A having a mass fraction of 18 wt %; S12. Add sodium alginate to water and stir to obtain a solution B with a mass fraction of 0.8 wt %; S13. The polyguanidine was added to water and stirred to obtain a solution C having a mass fraction of 0.6 wt %; S14. adding solution C to suspension A, the volume ratio of solution C to suspension A being 1:3, stirring for 60 min and centrifuging and washing to obtain barley bran@polyguanidine; S15. Add barley bran@polyguanidine to water to obtain a solution D with a mass fraction of 10 wt%, add solution B under stirring, the volume ratio of solution D to solution B is 3:2, and obtain a core-shell structure flame retardant after centrifugal washing. Example 10 A method for flame retardant finishing of cuprammonia fabric using barley bran extract, the flame retardant finishing method comprises loading a core-shell structure flame retardant onto the surface of the cuprammonia fabric through a padding process, the core-shell structure flame retardant has polyguanidine and sodium alginate as a shell layer and barley bran extract as a core layer, and the polyguanidine and sodium alginate are combined by self-assembly. Wherein, the flame retardant finishing method comprises the following steps: S1. The core-shell flame retardant is added to water and stirred to obtain a flame retardant finishing liquid having a mass fraction of 40wt%; S2. The copper ammonia fabric is immersed in the flame retardant finishing liquid obtained in S1, the bath ratio of the copper ammonia fabric and the flame retardant finishing liquid is 1:40, and a two-immersion and two-rolling process is adopted. The single immersion time of the two-immersion and two-rolling is 90s, and the rolling rate is 77%. Then, the copper ammonia fabric is dried at 120°C for 30min to obtain a flame retardant copper ammonia fabric. The preparation method of the core-shell flame retardant in S1 comprises the following steps: S11. adding the barley bran extract to water and dispersing it by ultrasonication to obtain a suspension A having a mass fraction of 25 wt %; S12. Add sodium alginate to water and stir to obtain a solution B with a mass fraction of 0.5 wt %; S13. Adding polyguanidine to water and stirring to obtain a solution C having a mass fraction of 0.8 wt %; S14. adding solution C to suspension A, the volume ratio of solution C to suspension A being 1:2, stirring for 40 min and centrifuging and washing to obtain barley bran@polyguanidine; S15. Add barley bran@polyguanidine to water to obtain a solution D with a mass fraction of 10 wt%, add solution B under stirring, the volume ratio of solution D to solution B is 2:1.5, and obtain a core-shell structure flame retardant after centrifugal washing. Embodiment 11 A method for flame retardant finishing of cuprammonia fabric using barley bran extract, wherein the flame retardant finishing method comprises loading a core-shell structure flame retardant onto the surface of the cuprammonia fabric through a padding process, wherein the core-shell structure flame retardant comprises polyguanidine and sodium alginate as a shell layer and barley bran extract as a core layer, and the polyguanidine and sodium alginate are combined by self-assembly; Wherein, the flame retardant finishing method comprises the following steps: S1. The core-shell flame retardant was added to water and stirred to obtain a flame retardant finishing liquid having a mass fraction of 32wt%; S2. The cuprammonia fabric is immersed in the flame retardant finishing liquid obtained in S1, the bath ratio of the cuprammonia fabric and the flame retardant finishing liquid is 1:35, and a two-immersion and two-rolling process is adopted. The single immersion time of the two-immersion and two-rolling is 90s, and the liquid rolling rate is 72%. Then, the cuprammonia fabric is dried at 110°C for 30min to obtain a flame retardant cuprammonia fabric. The preparation method of the core-shell flame retardant in S1 comprises the following steps: S11. The barley bran extract was added to water and ultrasonically dispersed to obtain a suspension A having a mass fraction of 15 wt %; S12. Add sodium alginate to water and stir to obtain a solution B with a mass fraction of 0.2 wt %; S13. The polyguanidine was added to water and stirred to obtain a solution C having a mass fraction of 0.8 wt %; S14. adding solution C to suspension A, the volume ratio of solution C to suspension A being 1:2, stirring for 60 min and centrifuging and washing to obtain barley bran@polyguanidine; S15. Add barley bran@polyguanidine to water to obtain a solution D with a mass fraction of 10 wt%, add solution B under stirring, the volume ratio of solution D to solution B is 3:2, and obtain a core-shell structure flame retardant after centrifugal washing. Example 12 A method for flame retardant finishing of cuprammonia fabric using barley bran extract, wherein the flame retardant finishing method comprises loading a core-shell structure flame retardant onto the surface of the cuprammonia fabric through a padding process, wherein the core-shell structure flame retardant comprises polyguanidine and sodium alginate as a shell layer and barley bran extract as a core layer, and the polyguanidine and sodium alginate are combined by self-assembly; Wherein, the flame retardant finishing method comprises the following steps: S1. The core-shell flame retardant is added to water and stirred to obtain a flame retardant finishing liquid having a mass fraction of 25wt%; S2. The cuprammonia fabric is immersed in the flame retardant finishing liquid obtained in S1. The bath ratio of the cuprammonia fabric and the flame retardant finishing liquid is 1:25. The double immersion and double rolling process is adopted. The single immersion time of the double immersion and double rolling is 55s, and the rolling rate is 73%. Then, the cuprammonia fabric is dried at 140°C for 30min to obtain the flame retardant cuprammonia fabric. The preparation method of the core-shell flame retardant in S1 comprises the following steps: S11. The barley bran extract was added to water and ultrasonically dispersed to obtain a suspension A having a mass fraction of 12 wt %; S12. Add sodium alginate to water and stir to obtain a solution B with a mass fraction of 0.4 wt %; S13. The polyguanidine was added to water and stirred to obtain a solution C having a mass fraction of 0.8 wt %; S14. adding solution C to suspension A, the volume ratio of solution C to suspension A being 1:3, stirring for 45 min and centrifuging and washing to obtain barley bran@polyguanidine; S15. Add barley bran@polyguanidine to water to obtain a solution D with a mass fraction of 8 wt%, add solution B under stirring, the volume ratio of solution D to solution B is 3:2, and obtain a core-shell structure flame retardant after centrifugal washing. Comparative Example 1 The difference between this comparative example and Example 12 is that the barley bran extract is directly loaded on the surface of the copper ammonia fabric by using a two-immersion and two-rolling process. Comparative Example 2 The difference between this comparative example and Example 12 is that the sodium alginate and polyguanidine are directly loaded on the surface of the cuprammonia fabric by a two-dipping and two-rolling process. Comparative Example 3 The difference between this comparative example and Example 12 is that the shell layer is ammonium polyphosphate and sodium alginate. Comparative Example 4 The difference between this comparative example and Example 12 is that no flame retardant treatment is performed on the surface of the cuprammonia fabric. Performance Testing The obtained samples were subjected to flame retardant performance tests, including limiting oxygen index test and vertical combustion analysis test. Table 1 Flame retardant performance test of Examples 1 to 12 and Comparative Examples 1 to 4 LOI(%) UL-94 Example 1 32.6 V-0 Example 2 34.4 V-0 Example 3 33.5 V-0 Example 4 32.7 V-0 Example 5 31.9 V-0 Example 6 31.6 V-0 Example 7 32.4 V-0 Example 8 33.3 V-0 Example 9 32.1 V-0 Example 10 33.8 V-0 Embodiment 11 34.2 V-0 Example 12 34.5 V-0 Comparative Example 1 27.6 V-1 Comparative Example 2 26.6 V-1 Comparative Example 3 24.9 V-1 Comparative Example 4 19.3 V-1 Note: 1. LOI test: Tested on a COI indexer according to ASTM D2863 standard, LOI < 22% is flammable, LOI 22-27% is flammable, LOI 27-34% is difficult to burn, LOI > 34% is non-flammable; 2. Vertical combustion analysis: Tested according to ASTM D3801 standard, UL-94 results are classified by combustion rating V-0, V-1 or V-2, with the V-0 rating representing the polymer material with the best flame retardancy. Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A method for flame retardant finishing of cuprammonia fabric using barley bran extract, characterized in that: The flame retardant finishing method comprises loading a core-shell structure flame retardant onto the surface of a cuprammonia fabric through a padding process, wherein the core-shell structure flame retardant has polyguanidine and sodium alginate as a shell layer and a barley bran extract as a core layer, and the polyguanidine and sodium alginate are combined through self-assembly.

2. The flame retardant finishing method of cuprammonia fabric according to claim 1, characterized in that: The flame retardant finishing method comprises the following steps: S1. The core-shell flame retardant is added to water and stirred to obtain a flame retardant finishing liquid; S2. Immerse the cuprammonia fabric in the flame retardant finishing liquid obtained in S1, and obtain the flame retardant cuprammonia fabric after two immersions and two rollings and drying.

3. The flame retardant finishing method of cuprammonia fabric according to claim 2, characterized in that: The preparation method of the core-shell structure flame retardant in S1 comprises the following steps: S11. adding the barley bran extract to water and dispersing it by ultrasonication to obtain a suspension A having a mass fraction of 10 to 25 wt %; S12. Add sodium alginate to water and stir to obtain a solution B having a mass fraction of 0.1 to 0.8 wt %; S13. Adding polyguanidine to water and stirring to obtain a solution C having a mass fraction of 0.1 to 0.8 wt %; S14. adding solution C to suspension A, stirring for 30 to 60 min and centrifuging and washing to obtain barley bran@polyguanidine; S15. Add barley bran@polyguanidine to water to obtain a solution D with a mass fraction of 8 to 10 wt%, add solution B under stirring conditions, and obtain a core-shell structure flame retardant after centrifugal washing.

4. The flame retardant finishing method of cuprammonia fabric according to claim 2, characterized in that: The mass fraction of the flame retardant finishing liquid in S1 is 20-40wt%.

5. The flame retardant finishing method of cuprammonia fabric according to claim 2, characterized in that: The bath ratio of the cuprammonia fabric and the flame retardant finishing liquid in S2 is 1:20-40.

6. The flame retardant finishing method of cuprammonia fabric according to claim 2, characterized in that: The single dipping time of the double dipping and double rolling in S2 is 40 to 90 seconds, and the rolling rate is 70 to 80%.

7. The flame retardant finishing method of cuprammonia fabric according to claim 2, characterized in that: The drying temperature in S2 is 100-160° C., and the drying time is 10-30 min.

8. The flame retardant finishing method of cuprammonia fabric according to claim 3, characterized in that: The volume ratio of solution C to suspension A in S14 is 1:1-3.

9. The flame retardant finishing method of cuprammonia fabric according to claim 3, characterized in that: The volume ratio of solution D to solution B in S15 is 2-3:1-2.