CN108978227A - A kind of phosphorous, nitrogen, the flame-retardant system of silicon and its flame-proof cotton fabric of preparation - Google Patents

Abstract

The invention discloses a flame retardant system containing phosphorus, nitrogen and silicon. The flame retardant system is composed of polycation sol and anion solution; the preparation method of the polycation sol is: dissolving PEI in deionized water, Stir to make a PEI solution, then add nano-SiO ₂ to the PEI solution, continue magnetic stirring evenly, use CH ₃ COOH to adjust the pH of the system, and prepare a polycation sol; the preparation method of the anion solution is: dissolve PA in Ionized water, and adjust its pH with sodium hydroxide solution to make anion solution, soak the cotton fabric in the above flame retardant system, and assemble it into flame retardant cotton fabric layer by layer. The flame retardant system containing phosphorus, nitrogen and silicon of the present invention has a certain synergistic effect on the flame retardant effect, and has better flame retardant effect.

Description

A flame retardant system containing phosphorus, nitrogen and silicon and the flame retardant cotton fabric prepared therefrom

technical field

The invention relates to the technical field of flame-retardant cotton fabrics, in particular to a method for constructing a flame-retardant coating containing phosphorus, nitrogen and silicon on the surface of cotton fabrics through layer-by-layer self-assembly.

Background technique

Cotton fabric not only has excellent moisture absorption, breathability, dyeability and biocompatibility, but also has a soft hand, so cotton fabric is widely used in decoration industry and textile industry. However, the limiting oxygen index (LOI) of cotton fiber is only 18%, which is easy to burn and cause fire, endangering the safety of human life and property. According to statistics, the death rate caused by fires caused by textiles or furniture in the home is higher than that caused by fires caused by other causes. In order to prevent fires from happening, in addition to fire prevention measures, textiles with flame retardant properties can also be used to delay the expansion of fires, allowing people to have time to evacuate or take measures to extinguish the fire. For this reason, textile flammability technical regulations have gradually become an important part of technical barriers to trade in various countries.

After flame-retardant treatment, textiles can reduce their flammability to varying degrees, significantly delay their combustion efficiency during the combustion process, and quickly self-extinguish after leaving the fire source, so they are not easy to burn. The flammability of cotton fabrics largely limits the application of cotton fabrics. Therefore, the flame retardant finishing of cotton fabrics is extremely important. Traditional cotton flame retardants are halogen-containing flame retardants, but they are gradually replaced by phosphorus-based flame retardants because they produce toxic gases during combustion. However, when phosphorus-containing flame retardants are used alone, it is difficult to achieve the desired flame retardant effect. The phosphorus-nitrogen-silicon flame retardant system does not contain halogen, does not produce toxic gas and smoke during combustion, has good compatibility with substances, is not easy to migrate, and can exert a synergistic flame retardant effect during combustion. The finishing of fabrics is mainly based on the traditional padding and baking process. However, this process also has certain limitations and disadvantages. For example, in the baking process, due to the high resulting in a decrease in fabric strength. In recent years, new processing technologies, such as electron beam radiation technology and layer-by-layer self-assembly technology, have been applied more and more in the modification and processing of textiles. Compared with the rolling and baking process, the layer-by-layer self-assembly technology has the advantages of simple preparation, controllable thickness, and the ability to combine and control different biomolecules.

Contents of the invention

In view of the above-mentioned problems in the prior art, the applicant of the present invention provides a flame-retardant system containing phosphorus, nitrogen, and silicon and the flame-retardant cotton fabric prepared therefrom. The flame retardant system containing phosphorus, nitrogen and silicon of the invention has a certain synergistic effect on the flame retardant effect, mild reaction conditions, simple process, convenient operation, green and pollution-free.

Technical scheme of the present invention is as follows:

A flame retardant system containing phosphorus, nitrogen and silicon, the flame retardant system is composed of polycation sol and anion solution;

The preparation method of the polycation sol is as follows: PEI (polyetherimide resin) is dissolved in deionized water, and the PEI solution is made by magnetic stirring, then nano _- SiO is added to the PEI solution, and the magnetic stirring is continued to be uniform. CH ₃ COOH adjusts the pH of the system and prepares polycation sol;

The preparation method of the anion solution is as follows: dissolving PA (phytic acid) in deionized water, and adjusting its pH with sodium hydroxide solution to prepare the anion solution.

The mass ratio of SiO ₂ to PEI in the polycation sol is 1:2-10.

The pH of the polycation sol is 5.

The mass concentration of PA in the anion solution is 0.5-2 wt %; the pH of the anion solution is 4-9.

The concentration of the sodium hydroxide solution is 4mol/L.

A flame-retardant cotton fabric containing the flame-retardant system, the preparation method of the flame-retardant cotton fabric is:

(1) Prepare 1wt% SiO ₂ -PEI polycation sol, the mass ratio of SiO ₂ to PEI is 1:2-10, adjust the pH to 5 with acetic acid solution;

(2) prepare the PA solution of 0.5～2wt%, adjust pH with the sodium hydroxide solution of 4mol/L to be 4～9;

(3) Immerse the scoured cotton fabric into the sol prepared in step (1). After 10 minutes, rinse the cotton fabric soaked in the sol three times with deionized water, and then dry it in an oven at 45°C. ;

(4) Soak the cotton fabric prepared in step (3) in the solution prepared in step (2). After 10 minutes, rinse the cotton fabric soaked in the sol with deionized water for 3 times, and then place it in an oven at 45 ° C. Dry to complete the assembly cycle of the first layer;

(5) Immerse the cotton fabric prepared in step (4) into the sol prepared in step (1). After 1 min, rinse the cotton fabric soaked in the sol three times with deionized water, and then place it in an oven at 45°C. medium drying;

(6) Soak the cotton fabric prepared in step (5) in the solution prepared in step (2). After 1 min, rinse the cotton fabric soaked in the sol with deionized water for 3 times, and then place it in an oven at 45°C. drying;

(7) Repeat the above steps (5) and (6) until the number of assembled layers reaches 2-7 layers.

The beneficial technical effects of the present invention are:

The hydrophilic nano-silica used in the present invention is small in size, large in specific surface area, and has a negative charge on the surface. Polyethyleneimine (PEI) is a water-soluble polymer, a colorless or light yellow viscous liquid, There are highly reactive primary and secondary amines on the macromolecular chain of polyethyleneimine, which exist as polymerized cations in water, which can neutralize and adsorb all anionic substances, and can also chelate heavy metal ions; when nano-silica and PEI When the macromolecules are mixed, the surface of the nano-carbon dioxide will adsorb the positively charged PEI macromolecules to form a stable sol. Due to the large specific surface area of silica, it is easy to adsorb on the surface of the substrate, so when the fabric is immersed in the polycation sol , can increase the adsorption amount of the polycation component on the surface of the fabric, and improve the efficiency of assembly.

The phytic acid (PA) used in the invention is a natural food, non-toxic, high in safety, high in phosphorus content (28%), and can be used as a green flame retardant.

The invention uses SiO ₂ -PEI and PA to self-assemble layer by layer on the cotton fabric, constructs a flame-retardant coating containing phosphorus, nitrogen and silicon on the surface of the cotton fabric, and prepares the flame-retardant cotton fabric. When the finished cotton fabric is burned, the finishing agent on the surface of the fabric will decompose before the cotton fabric and play a flame-retardant role. Compared with the previous assembly system, the main advantages of this system are high assembly efficiency (when the number of assembly layers reaches 7 layers, the weight gain rate can reach 27.7%), less cross-contamination, and high flame retardant efficiency (LOI can reach 33.7% ). At the same time, since the polyanions and cations will react on the surface of the fabric to form a dense film during the assembly process, the voids of the cotton fabric will be reduced, the light transmittance will be reduced, and the UPF value will be increased. Therefore, the self-assembled cotton fabric has both excellent flame retardancy and certain UV resistance.

Description of drawings

Fig. 1 is the vertical combustion diagram of the flame-retardant cotton fabric prepared in embodiment 1, 2, 3.

Fig. 2 is the vertical combustion figure of the flame-retardant cotton fabric prepared in embodiment 2, 4, 5.

Fig. 3 is the vertical combustion figure of the flame-retardant cotton fabric prepared in embodiment 6, 7, 8.

Fig. 4 is the vertical burning graph of the flame-retardant cotton fabric prepared in embodiment 8, 9, 10.

Detailed ways

The present invention will be specifically described below in conjunction with the accompanying drawings and embodiments.

Example 1

A flame-retardant cotton fabric containing the flame-retardant system, the preparation method of the flame-retardant cotton fabric is:

(1) Dissolve PEI in deionized water, stir magnetically to make PEI solution, then add nano-SiO ₂ (SiO ₂ : PEI mass ratio is 1:2) to PEI solution, continue magnetic stirring evenly, use CH ₃ COOH Adjust the pH of the system to 5, and prepare 1wt% SiO ₂ -PEI polycation sol;

(2) PA is dissolved in deionized water, and its pH is adjusted to 4 with 4mol/L sodium hydroxide solution to make a 2wt% PA solution;

(3) Immerse the scoured cotton fabric into the sol prepared in step (1). After 10 minutes, rinse the cotton fabric soaked in the sol three times with deionized water, and then dry it in an oven at 45°C. ;

(4) Soak the cotton fabric prepared in step (3) in the solution prepared in step (2). After 10 minutes, rinse the cotton fabric soaked in the sol with deionized water for 3 times, and then place it in an oven at 45 ° C. Dry to complete the assembly cycle of the first layer;

(5) Immerse the cotton fabric prepared in step (4) into the sol prepared in step (1). After 1 min, rinse the cotton fabric soaked in the sol three times with deionized water, and then place it in an oven at 45°C. medium drying;

(6) Soak the cotton fabric prepared in step (5) in the solution prepared in step (2). After 1 min, rinse the cotton fabric soaked in the sol with deionized water for 3 times, and then place it in an oven at 45°C. drying;

(7) Repeat steps (5) and (6) above until the number of assembled layers reaches 7 layers.

Example 2

(1) Dissolve PEI in deionized water, stir magnetically to make PEI solution, then add nano-SiO ₂ (SiO ₂ : PEI mass ratio is 1:6) to PEI solution, continue magnetic stirring evenly, use CH ₃ COOH Adjust the pH of the system to 5, and prepare 1wt% SiO ₂ -PEI polycation sol;

(2) PA is dissolved in deionized water, and its pH is adjusted to 4 with 4mol/L sodium hydroxide solution to make a 2wt% PA solution;

(3) Immerse the scoured cotton fabric into the sol prepared in step (1). After 10 minutes, rinse the cotton fabric soaked in the sol three times with deionized water, and then dry it in an oven at 45°C. ;

(4) Soak the cotton fabric prepared in step (3) in the solution prepared in step (2). After 10 minutes, rinse the cotton fabric soaked in the sol with deionized water for 3 times, and then place it in an oven at 45 ° C. Dry to complete the assembly cycle of the first layer;

(5) Immerse the cotton fabric prepared in step (4) into the sol prepared in step (1). After 1 min, rinse the cotton fabric soaked in the sol three times with deionized water, and then place it in an oven at 45°C. medium drying;

(6) Soak the cotton fabric prepared in step (5) in the solution prepared in step (2). After 1 min, rinse the cotton fabric soaked in the sol with deionized water for 3 times, and then place it in an oven at 45°C. drying;

(7) Repeat steps (5) and (6) above until the number of assembled layers reaches 7 layers.

Example 3

(1) Dissolve PEI in deionized water, stir magnetically to make PEI solution, then add nano-SiO ₂ (SiO ₂ : PEI mass ratio is 1:10) to PEI solution, continue magnetic stirring evenly, use CH ₃ COOH Adjust the pH of the system to 5, and prepare 1wt% SiO ₂ -PEI polycation sol;

(2) PA is dissolved in deionized water, and its pH is adjusted to 4 with 4mol/L sodium hydroxide solution to make a 2wt% PA solution;

(3) Immerse the scoured cotton fabric into the sol prepared in step (1). After 10 minutes, rinse the cotton fabric soaked in the sol three times with deionized water, and then dry it in an oven at 45°C. ;

(4) Soak the cotton fabric prepared in step (3) in the solution prepared in step (2). After 10 minutes, rinse the cotton fabric soaked in the sol with deionized water for 3 times, and then place it in an oven at 45 ° C. Dry to complete the assembly cycle of the first layer;

(5) Immerse the cotton fabric prepared in step (4) into the sol prepared in step (1). After 1 min, rinse the cotton fabric soaked in the sol three times with deionized water, and then place it in an oven at 45°C. medium drying;

(6) Soak the cotton fabric prepared in step (5) in the solution prepared in step (2). After 1 min, rinse the cotton fabric soaked in the sol with deionized water for 3 times, and then place it in an oven at 45°C. drying;

(7) Repeat steps (5) and (6) above until the number of assembled layers reaches 7 layers.

Example 4

(1) Dissolve PEI in deionized water, stir magnetically to make PEI solution, then add nano-SiO ₂ (SiO ₂ : PEI mass ratio is 1:6) to PEI solution, continue magnetic stirring evenly, use CH ₃ COOH Adjust the pH of the system to 5, and prepare 1wt% SiO ₂ -PEI polycation sol;

(2) PA is dissolved in deionized water, and its pH is adjusted to 7 with 4mol/L sodium hydroxide solution to make a 2wt% PA solution;

(3) Immerse the scoured cotton fabric into the sol prepared in step (1). After 10 minutes, rinse the cotton fabric soaked in the sol three times with deionized water, and then dry it in an oven at 45°C. ;

(4) Soak the cotton fabric prepared in step (3) in the solution prepared in step (2). After 10 minutes, rinse the cotton fabric soaked in the sol with deionized water for 3 times, and then place it in an oven at 45 ° C. Dry to complete the assembly cycle of the first layer;

(5) Immerse the cotton fabric prepared in step (4) into the sol prepared in step (1). After 1 min, rinse the cotton fabric soaked in the sol three times with deionized water, and then place it in an oven at 45°C. medium drying;

(6) Soak the cotton fabric prepared in step (5) in the solution prepared in step (2). After 1 min, rinse the cotton fabric soaked in the sol with deionized water for 3 times, and then place it in an oven at 45°C. drying;

(7) Repeat steps (5) and (6) above until the number of assembled layers reaches 7 layers.

Example 5

(1) Dissolve PEI in deionized water, stir magnetically to make PEI solution, then add nano-SiO ₂ (SiO ₂ : PEI mass ratio is 1:6) to PEI solution, continue magnetic stirring evenly, use CH ₃ COOH Adjust the pH of the system to 5, and prepare 1wt% SiO ₂ -PEI polycation sol;

(2) PA is dissolved in deionized water, and its pH is adjusted to 9 with 4mol/L sodium hydroxide solution to make a 2wt% PA solution;

(3) Immerse the scoured cotton fabric into the sol prepared in step (1). After 10 minutes, rinse the cotton fabric soaked in the sol three times with deionized water, and then dry it in an oven at 45°C. ;

(4) Soak the cotton fabric prepared in step (3) in the solution prepared in step (2). After 10 minutes, rinse the cotton fabric soaked in the sol with deionized water for 3 times, and then place it in an oven at 45 ° C. Dry to complete the assembly cycle of the first layer;

(5) Immerse the cotton fabric prepared in step (4) into the sol prepared in step (1). After 1 min, rinse the cotton fabric soaked in the sol three times with deionized water, and then place it in an oven at 45°C. medium drying;

(6) Soak the cotton fabric prepared in step (5) in the solution prepared in step (2). After 1 min, rinse the cotton fabric soaked in the sol with deionized water for 3 times, and then place it in an oven at 45°C. drying;

(7) Repeat steps (5) and (6) above until the number of assembled layers reaches 7 layers.

Example 6

(1) Dissolve PEI in deionized water, stir magnetically to make PEI solution, then add nano-SiO ₂ (SiO ₂ : PEI mass ratio is 1:6) to PEI solution, continue magnetic stirring evenly, use CH ₃ COOH Adjust the pH of the system to 5, and prepare 1wt% SiO ₂ -PEI polycation sol;

(2) PA is dissolved in deionized water, and its pH is adjusted to 6 with 4mol/L sodium hydroxide solution to make a 0.5wt% PA solution;

(3) Immerse the scoured cotton fabric into the sol prepared in step (1). After 10 minutes, rinse the cotton fabric soaked in the sol three times with deionized water, and then dry it in an oven at 45°C. ;

(4) Soak the cotton fabric prepared in step (3) in the solution prepared in step (2). After 10 minutes, rinse the cotton fabric soaked in the sol with deionized water for 3 times, and then place it in an oven at 45 ° C. Dry to complete the assembly cycle of the first layer;

(5) Immerse the cotton fabric prepared in step (4) into the sol prepared in step (1). After 1 min, rinse the cotton fabric soaked in the sol three times with deionized water, and then place it in an oven at 45°C. medium drying;

(6) Soak the cotton fabric prepared in step (5) in the solution prepared in step (2). After 1 min, rinse the cotton fabric soaked in the sol with deionized water for 3 times, and then place it in an oven at 45°C. drying;

(7) Repeat steps (5) and (6) above until the number of assembled layers reaches 7 layers.

Example 7

(1) Dissolve PEI in deionized water, stir magnetically to make PEI solution, then add nano-SiO ₂ (SiO ₂ : PEI mass ratio is 1:6) to PEI solution, continue magnetic stirring evenly, use CH ₃ COOH Adjust the pH of the system to 5, and prepare 1wt% SiO ₂ -PEI polycation sol;

(2) PA is dissolved in deionized water, and its pH is adjusted to 6 with 4mol/L sodium hydroxide solution to make a 1wt% PA solution;

(3) Immerse the scoured cotton fabric into the sol prepared in step (1). After 10 minutes, rinse the cotton fabric soaked in the sol three times with deionized water, and then dry it in an oven at 45°C. ;

(4) Soak the cotton fabric prepared in step (3) in the solution prepared in step (2). After 10 minutes, rinse the cotton fabric soaked in the sol with deionized water for 3 times, and then place it in an oven at 45 ° C. Dry to complete the assembly cycle of the first layer;

(5) Immerse the cotton fabric prepared in step (4) into the sol prepared in step (1). After 1 min, rinse the cotton fabric soaked in the sol three times with deionized water, and then place it in an oven at 45°C. medium drying;

(6) Soak the cotton fabric prepared in step (5) in the solution prepared in step (2). After 1 min, rinse the cotton fabric soaked in the sol with deionized water for 3 times, and then place it in an oven at 45°C. drying;

(7) Repeat steps (5) and (6) above until the number of assembled layers reaches 7 layers.

Example 8

(1) Dissolve PEI in deionized water, stir magnetically to make PEI solution, then add nano-SiO ₂ (SiO ₂ : PEI mass ratio is 1:6) to PEI solution, continue magnetic stirring evenly, use CH ₃ COOH Adjust the pH of the system to 5, and prepare 1wt% SiO ₂ -PEI polycation sol;

(2) PA is dissolved in deionized water, and its pH is adjusted to 6 with 4mol/L sodium hydroxide solution to make a 2wt% PA solution;

(3) Immerse the scoured cotton fabric into the sol prepared in step (1). After 10 minutes, rinse the cotton fabric soaked in the sol three times with deionized water, and then dry it in an oven at 45°C. ;

(4) Soak the cotton fabric prepared in step (3) in the solution prepared in step (2). After 10 minutes, rinse the cotton fabric soaked in the sol with deionized water for 3 times, and then place it in an oven at 45 ° C. Dry to complete the assembly cycle of the first layer;

(5) Immerse the cotton fabric prepared in step (4) into the sol prepared in step (1). After 1 min, rinse the cotton fabric soaked in the sol three times with deionized water, and then place it in an oven at 45°C. medium drying;

(6) Soak the cotton fabric prepared in step (5) in the solution prepared in step (2). After 1 min, rinse the cotton fabric soaked in the sol with deionized water for 3 times, and then place it in an oven at 45°C. drying;

(7) Repeat steps (5) and (6) above until the number of assembled layers reaches 7 layers.

Example 9

(1) Dissolve PEI in deionized water, stir magnetically to make PEI solution, then add nano-SiO ₂ (SiO ₂ : PEI mass ratio is 1:6) to PEI solution, continue magnetic stirring evenly, use CH ₃ COOH Adjust the pH of the system to 5, and prepare 1wt% SiO ₂ -PEI polycation sol;

(2) PA is dissolved in deionized water, and its pH is adjusted to 6 with 4mol/L sodium hydroxide solution to make a 2wt% PA solution;

(3) Soak the scoured cotton fabric into the sol prepared in step (1). After 10 minutes, rinse the cotton fabric soaked in the sol three times with deionized water, and then dry it in an oven at 45°C. ;

(4) Soak the cotton fabric prepared in step (3) in the solution prepared in step (2). After 10 minutes, rinse the cotton fabric soaked in the sol with deionized water for 3 times, and then place it in an oven at 45 ° C. Dry to complete the assembly cycle of the first layer;

(5) Immerse the cotton fabric prepared in step (4) into the sol prepared in step (1). After 1 min, rinse the cotton fabric soaked in the sol three times with deionized water, and then place it in an oven at 45°C. medium drying;

(6) Soak the cotton fabric prepared in step (5) in the solution prepared in step (2). After 1 min, rinse the cotton fabric soaked in sol with deionized water for 3 times, and then place it in an oven at 45°C. Drying; the flame-retardant cotton fabric with 2 self-assembled layers was obtained.

Example 10

(1) Dissolve PEI in deionized water, stir magnetically to make PEI solution, then add nano-SiO ₂ (SiO ₂ : PEI mass ratio is 1:6) to PEI solution, continue magnetic stirring evenly, use CH ₃ COOH Adjust the pH of the system to 5, and prepare 1wt% SiO ₂ -PEI polycation sol;

(2) PA is dissolved in deionized water, and its pH is adjusted to 6 with 4mol/L sodium hydroxide solution to make a 2wt% PA solution;

(3) Soak the scoured cotton fabric into the sol prepared in step (1). After 10 minutes, rinse the cotton fabric soaked in the sol three times with deionized water, and then dry it in an oven at 45°C. ;

(4) Soak the cotton fabric prepared in step (3) in the solution prepared in step (2). After 10 minutes, rinse the cotton fabric soaked in the sol with deionized water for 3 times, and then place it in an oven at 45 ° C. Dry to complete the assembly cycle of the first layer;

(5) Immerse the cotton fabric prepared in step (4) into the sol prepared in step (1). After 1 min, rinse the cotton fabric soaked in the sol three times with deionized water, and then place it in an oven at 45°C. medium drying;

(6) Soak the cotton fabric prepared in step (5) in the solution prepared in step (2). After 1 min, rinse the cotton fabric soaked in sol with deionized water for 3 times, and then place it in an oven at 45°C. drying;

(7) Repeat steps (5) and (6) above until the number of assembled layers reaches 4 layers.

test case 1

According to GB/T 5455-1997 "Vertical Method for Testing the Flammability of Textiles", the finished cotton fabrics and raw cotton fabrics prepared in Cases 1 to 10 were tested for vertical combustion on the YG815 Vertical Fabric Flammability Tester. The standard sample size is 300×80mm. The images of the fabric after vertical burning are shown in Figures 1, 2, 3, and 4. It can be seen intuitively from Figure 1 that as the mass ratio of Si ₂ O to PEI increases, the char length of the flame-retardant finished cotton fabric first decreases and then increases. Figure 2 intuitively shows that the flame-retardant effect of the cotton fabric assembled and finished under weakly acidic conditions is significantly higher than that of the flame-retardant cotton fabric under weakly alkaline conditions. It can be seen intuitively from Figure 3 that with the increase of the concentration of the PA solution, the flame retardant effect of the flame retardant finished cotton fabric gradually increases. It can be seen from Figure 4 that with the increase of the number of assembled layers, the damage length of the vertical burning of the fabric gradually decreases, and the flame retardancy performance gradually improves.

Table 1

test case 2

According to GB/T 5454-1997 "Oxygen Index Method for Testing the Combustion Performance of Textiles", the finished cotton fabrics and raw cotton fabrics prepared in Cases 9, 10, and 8 were cut into at least 5 pieces, and the sample size was about 25×6cm ² . In the oxygen-nitrogen mixed flow, the percentage content is used to express the minimum oxygen concentration value required to maintain its combustion. The results are shown in Table 2. It can be seen from Table 2 that as the number of assembled layers increases, the LOI value of the flame-retardant finished cotton fabric increases from 18.2% to 33.7% of the raw cotton.

Table 2

Example raw cotton 9 10 8 LOI/% 18.2 26.0 29.1 33.7

Test case 3

The UV protection factor (UPF) was used to evaluate the UV resistance of the finished cotton fabrics and raw cotton fabrics prepared in Examples 9, 10, and 8. The test results are shown in Table 3. The fabric samples were tested according to the test method of Australia/New Zealand Standard AS/NZS4399:1996, and the experimental instrument was the Cary50 textile UV protection factor tester of American VARIAN Technology Co., Ltd. The results are shown in Table 3. It can be seen from Table 3 that with the increase of the number of assembled layers, the UPF value of the flame-retardant cotton fabric increases from 6.76 to 35.78 of the raw cotton, indicating that the cotton fabric after self-assembly finishing has better Flame retardant and good UV resistance.

table 3

Example raw cotton 9 10 8 UPF 6.76 15.36 23.67 35.78

Claims (6)

1. the flame-retardant system of a kind of phosphorous, nitrogen, silicon, which is characterized in that the flame-retardant system is molten by polycation colloidal sol, anion Liquid composition；

The polycation colloidal sol the preparation method comprises the following steps: by PEI dissolution in deionized water, PEI solution is made in magnetic agitation, Backward PEI solution in Nano-meter SiO_2 is added₂, continuation magnetic agitation is uniform, using CH₃The pH of COOH regulation system is configured to gather Cationic sol；

The anion solutions the preparation method comprises the following steps: PA is dissolved in deionized water, and adjust its pH with sodium hydroxide solution, make At anion solutions.

2. flame-retardant system according to claim 1, which is characterized in that SiO in the polycation colloidal sol₂With the quality of PEI Than for 1:2~10.

3. flame-retardant system according to claim 1, which is characterized in that the pH of the polycation colloidal sol is 5.

4. flame-retardant system according to claim 1, which is characterized in that the mass concentration of PA is in the anion solutions 0.5~2wt%；The pH of the anion solutions is 4~9.

5. flame-retardant system according to claim 1, which is characterized in that the concentration of the sodium hydroxide solution is 4mol/L.

6. a kind of flame-proof cotton fabric containing flame-retardant system described in claim 1, which is characterized in that the system of the flame-proof cotton fabric Preparation Method are as follows:

(1) SiO of 1wt% is prepared₂- PEI polycation colloidal sol, SiO₂Mass ratio with PEI is 1:2~10, with acetum tune Saving pH is 5；

(2) the PA solution for preparing 0.5~2wt%, adjusting pH with the sodium hydroxide solution of 4mol/L is 4~9；

(3) cotton fabric of kiering is impregnated into the colloidal sol prepared in step (1), after 10min, the cotton for impregnating colloidal sol is knitted Object is rinsed 3 times with deionized water, is then placed in 45 DEG C of baking oven and is dried；

(4) cotton fabric prepared in step (3) is immersed in the solution of step (2) preparation, after 10min, colloidal sol will be impregnated Cotton fabric with deionized water rinse 3 times, be then placed in 45 DEG C of baking oven and dry, complete first layer assembling circulation；

(5) cotton fabric prepared in step (4) is impregnated into the colloidal sol prepared in step (1), after 1min, colloidal sol will be impregnated Cotton fabric with deionized water rinse 3 times, be then placed in 45 DEG C of baking oven and dry；

(6) cotton fabric prepared in step (5) is immersed in the solution of step (2) preparation, after 1min, colloidal sol will be impregnated Cotton fabric is rinsed 3 times with deionized water, is then placed in 45 DEG C of baking oven and is dried；

(7) repeat the above steps the operations of (5), (6), until the assembling number of plies reaches 2~7 layers.