CN109914117B - Flame-retardant leather, preparation method and application - Google Patents
Flame-retardant leather, preparation method and application Download PDFInfo
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Abstract
The invention discloses flame-retardant leather and a preparation method thereof, wherein organic silica gel is used as a main component, modified nano-silica and modified layered double-metal oxide are used as flame-retardant factors, the synergistic effect among the components, such as the synergistic flame-retardant effect among the flame-retardant factors, the bonding effect between the modified nano-silica and dimethyl silicone oil, the synergistic effect between high-viscosity dimethyl silicone oil and low-viscosity dimethyl silicone oil and the like are utilized, and the process is improved, so that the flame-retardant leather has good flame-retardant performance, and the mechanical property and the environmental protection requirement of the material are taken into consideration simultaneously, so that the flame-retardant leather can meet the performance requirements of furniture, home furnishings and artware leather, and has wide market prospect.
Description
Technical Field
The invention relates to the field of leather material preparation, and particularly relates to flame-retardant leather, a preparation method and application.
Background
At present, the production processes of artificial leather and synthetic leather at home and abroad are mainly divided into a dry polyurethane leather making process, a wet polyurethane leather making process and a water-based polyurethane process. In the production process, solvent type polyurethane resin is used, and because the solvent type polyurethane resin contains a large amount of toxic and harmful chemical solvents such as dimethyl formamide (DMF), toluene, butanone and the like, the solvent type polyurethane resin can cause great damage to the environment and human bodies through volatilization and residue.
The applicant has previously developed an environment-friendly synthetic leather prepared by using organic silica gel and environment-friendly auxiliary materials through a great deal of research and development work, but the application of the environment-friendly synthetic leather is limited because the environment-friendly synthetic leather is not subjected to targeted improvement aiming at a certain specific application scene.
Leather can provide good texture to people visually and good touch feeling due to the special texture, so that the leather is a high-end pronouncing word, is increasingly wide in application range, gradually expands to high-grade consumption from initial wearing, and has a wide market prospect in the fields of furniture, home furnishings, artware and the like.
For furniture, home decoration and artware, leather is required to be environment-friendly, and higher wear-resistant and flame-retardant requirements are further provided for the leather. For traditional polyurethane leather, flame retardance is mainly realized by non-halogen and halogen flame retardants. Halogen flame retardants have great harm and are gradually eliminated, and non-halogen flame retardants, such as magnesium hydroxide, have good flame retardancy, but require a large amount of flame retardants to fully exert their effects, and the mechanical properties, texture, and the like of the material deteriorate as the amount of flame retardants increases. Meanwhile, the magnesium hydroxide has weak acting force in leather, is easy to run off in the scrubbing process, and has rapidly deteriorated flame retardant property after being scrubbed for a long time.
At present, flame retardant research is rarely carried out on environment-friendly leather prepared by organic silica gel, but a non-halogen flame retardant applied to the traditional polyurethane leather has the problems more or less, and cannot be directly applied to the environment-friendly leather prepared by the organic silica gel, so that the flame retardant of the environment-friendly leather needs to be researched as a special subject.
Disclosure of Invention
The invention aims to provide flame-retardant leather, a preparation method and application.
In order to achieve the purpose, the invention adopts the following technical scheme:
the flame-retardant leather comprises a surface layer, a middle base material layer, a bottom layer and a base fabric layer which are sequentially bonded, wherein the surface layer comprises the following components in parts by weight:
80-100 parts of organic silica gel;
8-10 parts of a hardening agent;
10-30 parts of modified layered double hydroxide;
6-12 parts of dimethyl silicone oil;
the ratio of the weight parts of the modified nano-silica to the weight parts of the modified layered double hydroxide is not less than 8%, and the ratio of the weight parts to the total weight parts of the modified nano-silica is not more than 1.9%.
Preferably, the modified layered double hydroxide is prepared by modifying sodium stearate and layered double hydroxide according to the weight ratio of (3-5) to 100.
Preferably, the modified nano-silica is prepared from propyl trimethylsilane and nano-silica according to the following weight ratio of (12-18): 100 weight portions are modified.
Preferably, the simethicone consists of high-viscosity simethicone and low-viscosity simethicone, the viscosity value of the high-viscosity simethicone is 100-300 mPa.s/25 ℃, the viscosity value of the low-viscosity simethicone is not more than 50 mPa.s/25 ℃, and the weight part of the low-viscosity simethicone is 2-3.
The invention also provides a preparation method of the flame-retardant leather, which comprises the following steps:
s1, preparing a surface layer:
mixing 80-100 parts of organic silica gel, 8-10 parts of hardening agent and 10-30 parts of modified layered double hydroxide to form primary slurry;
adjusting the viscosity of the primary slurry to 100000-120000 mPa.s/25 ℃ by using 4-9 parts of high-viscosity dimethyl silicone oil with the viscosity value of 100-300 mPa.s/25 ℃ to form secondary slurry;
mixing a certain amount of modified nano-silica into the secondary slurry to form tertiary slurry, wherein the ratio of the weight part of the modified nano-silica to the weight part of the modified layered double hydroxide is not less than 8%, and the ratio of the weight part of the modified nano-silica to the total weight part of the modified layered double hydroxide is not more than 1.9%;
coating the third sizing agent on the surface of release paper/film, wherein the coating thickness is 0.1mm, and then inputting the release paper/film into a multi-section temperature difference oven, wherein the multi-section temperature difference oven is sequentially provided with a low-temperature region at 110 ℃, a medium-temperature region at 120 ℃ and a high-temperature region at 130 ℃, a coating film is baked in the low-temperature region for 1min, and is baked in the medium-temperature region for 2 min;
uniformly coating 2-3 parts of low-viscosity dimethyl silicone oil with the viscosity value not more than 50mPa & s/25 ℃ on the coating film output from the medium temperature area, and then inputting the coating film into the high temperature area to be baked for 1min to obtain a surface layer;
and S2, sequentially finishing the manufacture of the middle base material layer, the bottom layer and the base fabric layer.
Preferably, the modified layered double hydroxide is prepared by:
adding sodium stearate and layered double hydroxide into a reaction kettle according to the weight ratio of (3-5) to 100, stirring for 1 hour at the temperature of 75-85 ℃, and ultrasonically dispersing once every 3-5 minutes at the interval of 10-15 minutes.
Preferably, the modified nanosilica is prepared by:
adding a certain amount of propyl trimethyl silane into the hydrolysate, and hydrolyzing at 70-75 ℃ for 30 +/-5 min to obtain a hydrolysis reactant; adding a certain amount of nano silicon dioxide into a certain amount of absolute ethyl alcohol, and performing ultrasonic dispersion for 10-15min to obtain a dispersion liquid; heating the hydrolysis reactant and the dispersion liquid to 80-85 ℃ in a reaction kettle, stirring for 4 hours at constant temperature, and cooling to room temperature to obtain cooling liquid; carrying out centrifugal separation on the cooling liquid, and drying to constant humidity to obtain modified nano silicon dioxide;
the hydrolysate is prepared from ethanol with volume fraction of more than 75% and hydrochloric acid with concentration of 0.1mol/L according to the weight ratio of 1: 1 volume is prepared;
the adding proportion of each material is as follows:
| propyltrimethylsilane | Nano silicon dioxide | Hydrolysate | Anhydrous ethanol |
| 12-18g | 100g | 1000mL | 500ml |
The invention also discloses application of the flame-retardant leather, which is applied to furniture, home decoration and artware.
After adopting the technical scheme, compared with the background technology, the invention has the following advantages:
1. the invention adopts layered double metal (the double metal is metal ion, but not heavy metal) hydroxide as fire retardant, when the layered double metal hydroxide is heated or burned, free water between layers and bound water between the layers are heated and decomposed to take away a large amount of heat, meanwhile, part of carbonate is heated and decomposed into carbon dioxide which escapes together with water vapor, the carbon dioxide is inert gas which dilutes the oxygen concentration in the air while taking away the heat; the decomposed solid product has large specific surface area and strong alkalinity, and can absorb the smoke released by the material thermal decomposition in time, thereby playing the roles of smoke suppression and smoke elimination; meanwhile, the decomposition temperature of the layered double hydroxide comprises a low temperature end and a high temperature end, so that the flame retardant temperature range is widened, and the layered double hydroxide has the advantages of aluminum hydroxide and magnesium hydroxide flame retardants.
2. The nano silicon dioxide is added to improve the tensile property, the tear resistance and the wear resistance of the leather. Meanwhile, as the specific surface area of the nano silicon dioxide is large and the density is small, the nano silicon dioxide is easy to gather on a melting surface in the combustion process, so that a compact carbon layer is formed together with the layered double hydroxide, the heat and substance transfer between the melting surface and the outside is blocked, the synergistic flame retardant effect is achieved, and the using amount of the layered double hydroxide is reduced.
3. According to the invention, both the nano silicon dioxide and the layered double hydroxide are modified, so that the agglomeration phenomenon of the nano silicon dioxide and the layered double hydroxide is avoided, the nano silicon dioxide and the layered double hydroxide have better dispersibility, and meanwhile, the nano silicon dioxide and the layered double hydroxide have better compatibility with an organic silica gel base material. Meanwhile, the modified nano silicon dioxide is easy to react with the dimethyl silicone oil by utilizing the activity of the modified nano silicon dioxide to form a network-shaped microporous film structure, so that the mechanical property of the colloid is improved.
4. According to the invention, the high-viscosity dimethyl silicone oil and the low-viscosity dimethyl silicone oil are used in a matching manner, so that the texture of the surface layer is more exquisite, and the high permeability of the low-viscosity dimethyl silicone oil can be utilized to fill micropores in the microporous film, so that the combination degree of the layered double metal hydroxide and the nano silicon dioxide with the base material is better.
5. The invention does not use toxic and harmful substances in the preparation process, and is safe and environment-friendly.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
Preparing a flame-retardant leather surface layer:
mixing 80-100 parts of organic silica gel, 8-10 parts of hardening agent and 10-30 parts of modified layered double hydroxide to form primary slurry;
adjusting the viscosity of the primary slurry to 100000-120000 mPa.s/25 ℃ by using 4-9 parts of high-viscosity dimethyl silicone oil with the viscosity value of 100-300 mPa.s/25 ℃ to form secondary slurry;
mixing a certain amount of modified nano-silica into the secondary slurry to form tertiary slurry, wherein the ratio of the weight part of the modified nano-silica to the weight part of the modified layered double hydroxide is not less than 8%, and the ratio of the weight part of the modified nano-silica to the total weight part of the modified layered double hydroxide is not more than 1.9%;
coating the third sizing agent on the surface of release paper/film, wherein the coating thickness is 0.1mm, and then inputting the release paper/film into a multi-section temperature difference oven, wherein the multi-section temperature difference oven is sequentially provided with a low-temperature region at 110 ℃, a medium-temperature region at 120 ℃ and a high-temperature region at 130 ℃, a coating film is baked in the low-temperature region for 1min, and is baked in the medium-temperature region for 2 min;
and uniformly coating 2-3 parts of low-viscosity dimethyl silicone oil with the viscosity value not more than 50mPa & s/25 ℃ on the coating film output from the medium temperature area, and then inputting the coating film into the high temperature area to be baked for 1min to obtain a surface layer.
Specific examples are shown in the following table:
in the table, A represents organic silica gel, B represents a hardening agent, C represents modified layered double hydroxide, D represents high-viscosity dimethyl silicone oil, E represents low-viscosity dimethyl silicone oil, and F represents modified nano silicon dioxide. If a component value in the table is 0 and a single step is simply the addition of that component, then the single step is eliminated.
The organic silica gel used in this example is 100% polysiloxane, formula: aSiO2·nH2O; the hardening agent is polysiloxane with the content of 100 percent, and the molecular formula is as follows: bSiO2·nH2O; a and b are polymerization degrees which are both larger than 2, and a is larger than b; n is 1 to 3. The organic silica gel is addition type silica gel produced by Xiamen Xinghuli silica gel Co., Ltd; the hardener is an addition type silica gel hardener produced by Xiamen Xin Chuangli silica gel Limited. The modifying component will be discussed in detail later.
And (3) flame retardant test: the sample is only used for preparing the surface layer, and the intermediate base material layer, the bottom layer and the base fabric layer are also used in practical application, so that the thickness of the surface layer is relatively thin. According to the flame retardant material standard ANSI/UL-94-1985 standard B-level flame retardant grade test, the minimum thickness of the test sample needs to be 3mm, so that flame retardant test strips 1-13 with the length of 127, the width of 12.7 and the minimum thickness of 3mm are prepared according to the mixture ratio of the sample examples 1-13 (the drying time in the preparation process is linearly increased correspondingly) to check the flame retardant capability of the surface layer.
The results are as follows:
it can be seen from the comparison result between the flame-retardant test strip 1 and the flame-retardant test strip 2 that the flame retardance of the surface layer is remarkably improved after the modified nano silicon dioxide is added.
The comparison results of the flame-retardant test strips 1-4 show that under the condition of quantitative modification of the double-metal hydroxide, the flame-retardant effect of the test strips is more obvious along with the increase of the content of the modified nano-silica, which indicates that the modified nano-silica and the modified double-metal hydroxide have obvious synergistic flame-retardant effect.
From the comparison results of the flame-retardant test strips 4-9, it can be seen that when the ratio of the modified nano-silica to the modified double metal hydroxide reaches 8%, the improvement of the flame-retardant effect tends to be limited, and the micro improvement is related to the flame-retardant effect of the nano-silica.
From the comparison results of flame retardant test strips 9-13, it can be seen that the flame retardant effect is improved when the composition of the modified double metal hydroxide is increased.
Mechanical property test: the mechanical property test is carried out by using the flame-retardant test bar, and the result is as follows:
from the test results of the flame-retardant test strips 1-7, it can be seen that the mechanical properties of the surface layer are improved with the increase of the modified nano-silica, because the modified silica has high specific surface area and high activity, and can be bonded with the organic silica gel to form a network structure, so that the mechanical properties are improved.
The test results of the flame-retardant test strips 7-9 show that the addition value of the modified nano-silica is preferably 1.9 parts of the total weight, and the mechanical property of the surface layer is reduced with the further increase of the modified nano-silica, because the excessive modified nano-silica is agglomerated in certain positions, so that the stress concentration is caused, and the mechanical property of the surface layer is reduced. Therefore, it can be seen that there is a relatively contradictory relationship between the flame retardant factor and the tensile property of the material, and although the invention blends the two to make the samples 7 and 11-13 superior to the conventional silica gel leather in both tensile and flame retardant properties, the practical application should be emphasized according to the requirements.
Washing experiment:
referring to the mixture ratios of sample 7 and sample 14, washing bars were manufactured, except that both of the comparative bars 1 and 2 were made using unmodified layered double hydroxides and nano silica. Flame retardant bars 7, 14 and 15 were selected for washing experiments, which simulated normal washing conditions for 20 minutes each time. Thereafter, the flame-retardant test was repeated using the dried test strip, and the following results (each value represents the burning rate in mm/min) were obtained:
| number of washes | 0 | 2 | 4 | 6 | 8 | 10 |
| Comparative test strip 1 | 27.2 | 28.1 | 30.2 | 32.1 | 35.4 | 36.4 |
| Comparison test strip 2 | 27.3 | 34.3 | 36.8 | 38.7 | 39.5 | 40.4 |
| Flame-retardant test strip 7 | 26.0 | 26.2 | 26.3 | 26.3 | 26.4 | 26.4 |
| Flame retardant test strip 14 | 26.1 | 26.5 | 27.1 | 27.4 | 27.6 | 28.1 |
| Flame-retardant test strip 15 | 26.1 | 26.2 | 26.3 | 26.3 | 26.3 | 26.4 |
The comparison of the comparison test strip 1 and the flame-retardant test strip 7 shows that whether modification is carried out or not has great influence on the fixing effect of the flame-retardant factor in leather, and the flame-retardant performance of the comparison test strip 1 is obviously reduced after washing for many times, and the reason is that the unmodified flame-retardant factor has poor compatibility with organic silica gel.
It can be seen from comparison of comparison test strip 1 and comparison test strip 2, and fire-retardant test strip 7 and fire-retardant test strip 14 that the test strip that has added low viscosity dimethyl silicone oil is better to fire-retardant factor's adsorption effect, this is because it possesses high permeability, can permeate the micropore column structure of film, fills the micropore, simultaneously, remedies the bubble defect that low temperature district and middle temperature district probably produced, when fixed fire-retardant factor, still makes the texture of surface course more exquisite.
It can be seen from the comparison between the flame-retardant test strip 7 and the flame-retardant test strip 15 that although the flame-retardant test strip 15 is added with more low-viscosity dimethyl silicone oil, the fixing effect of the flame-retardant test strip on the flame-retardant factor is not increased obviously.
Example 2
In this example, the modified layered double hydroxide used in the present application is explained.
Modified layered double hydroxide: adding sodium stearate and layered double hydroxide (neutral pH value) into a reaction kettle according to the weight ratio of (3-5) to 100, stirring for 1 hour at the temperature of 75-85 ℃, and ultrasonically dispersing once every 3-5 minutes at intervals of 10-15 minutes.
Influence of the ratio on the activation index:
| sodium stearate adding amount | 1％ | 3％ | 5％ | 7％ | 10％ |
| Index of activation | 0.23 | 0.89 | 0.985 | 0.987 | 0.988 |
Applicants have found in their studies that the activation index initially rises sharply with increasing sodium stearate, but tends to stabilize (close to 1) as the sodium stearate increases to about 5% of the layered double hydroxide content, at which point the activation index continues to increase and tends to stabilize. At the same time, the mechanical properties of the material are affected by an excessive amount of sodium stearate.
Effect of reaction temperature on activation index:
| temperature (. degree.C.) | 30 | 50-70 | 75 | 80 | 85 | 90 | 95 | 100 |
| Index of activation | 0.86 | 0.962 | 0.981 | 0.985 | 0.983 | 0.982 | 0.98 | 0.97 |
It can be seen that initially, as the temperature increases, sodium stearate is first adsorbed on the portion of the layered double hydroxide having the greatest activity, the activation index rises sharply, thereafter enters a gradual increase region in the temperature range of 50 to 70 ℃, then peaks in the temperature range of 75 to 85 ℃, and thereafter instead tends to decrease as the temperature increases.
Example 3
Preparation of modified silica: adding a certain amount of propyltrimethylsilane (KH560) into the hydrolysate, and hydrolyzing at 70-75 deg.C for 30 + -5 min to obtain hydrolysis reactant; adding a certain amount of nano silicon dioxide (10-30nm) into a certain amount of absolute ethyl alcohol, and performing ultrasonic dispersion for 10-15min to obtain a dispersion liquid; heating the hydrolysis reactant and the dispersion liquid to 80-85 ℃ in a reaction kettle, stirring for 4 hours at constant temperature, and cooling to room temperature to obtain cooling liquid; carrying out centrifugal separation on the cooling liquid, and drying to constant humidity to obtain modified nano silicon dioxide;
the hydrolysate is prepared from ethanol with volume fraction of more than 75% and hydrochloric acid with concentration of 0.1mol/L according to the weight ratio of 1: 1 volume is prepared;
the adding proportion of each material is as follows:
| propyltrimethylsilane | Nano silicon dioxide | Hydrolysate | Anhydrous secondAlcohol(s) |
| 12-18g | 100g | 1000mL | 500ml |
Influence of the ratio on the activation index:
| propyltrimethylsilane | 5％ | 10％ | 15％ | 20％ | 25％ |
| Graft ratio | 7％ | 7.8％ | 9.6％ | 8.3％ | 7.7％ |
The grafting rate increased significantly with increasing amounts of propyltrimethylsilane, and reached the highest value when the ratio to nanosilicon dioxide reached 15%. Thereafter, the amount of propyltrimethylsilane used is too large, excess propyltrimethylsilane is liable to self-polymerize to cause aggregates between particles, and siloxane negative ions are generated to depolymerize propyltrimethylsilane which has been grafted on the surface of the nano-silica, resulting in a decrease in grafting yield.
Effect of reaction temperature on grafting ratio:
| temperature (. degree.C.) | 30 | 60 | 75 | 80 | 85 | 90 | 95 | 100 |
| Graft ratio | 6.3％ | 9.5％ | 10.1％ | 10.4％ | 10.3％ | 10.1％ | 10.0％ | 9.9％ |
With the rise of the temperature, the grafting rate obviously rises and reaches the highest value in the range of 80-85 ℃, and then the temperature is too high, the Brownian motion is too violent, the collision probability of the nano-silica is increased, the agglomeration phenomenon is easy to occur, and the grafting rate tends to be gentle or even slightly reduced.
Example 4
On the basis of example 1, the preparation of further layers was carried out.
Preparing an intermediate base material layer: mixing 80-120 parts of organic silica gel and 10 parts of hardening agent to form organic silica gel slurry, adding 8-60 parts of toner, adjusting the viscosity of the organic silica gel P41 slurry to 250000-300000 mPa & s/25 ℃ by using 0-20 parts of vinyl silicone oil, coating the mixture on the surface of the surface layer to form an intermediate base material layer with the coating thickness of 0.1mm, and performing gradient drying (namely, adopting the multi-stage temperature difference oven in the embodiment 1);
preparing a bottom layer and attaching the bottom layer to a base cloth layer: after mixing 80-120 parts of organic silica gel and 10 parts of hardening agent into 2 parts of organic silica gel slurry, adding 2-5 parts of nano silicon dioxide and 2-5 parts of silane coupling agent, adjusting the viscosity of the slurry to 15000-25000 mPa & s/25 ℃ by using 0-20 parts of vinyl silicone oil, coating the slurry on the intermediate base material layer to obtain a coating thickness of 0.15mm, laminating the intermediate base material layer with a base material layer, and performing gradient drying (namely adopting the multi-section temperature difference oven in the embodiment 1) to form the final silica gel leather.
The base cloth layer is knitted fabric, woven fabric, super fiber, suede or polyester fabric.
In the preparation process of the bottom layer, the silane coupling agent is preferably trimethoxy silane, gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane or vinyl tri- (beta-methoxyethoxy) silane, and the coupling agent migrates into the nano silicon dioxide to neutralize the organic silica gel by virtue of the diffusion effect and the coupling effect of molecules, so that the bonding effect between the nano silicon dioxide and the base cloth layer is improved.
Example 5
The flame-retardant leather prepared by the method in the embodiment 1 or 4 has a good fireproof capability, can effectively prevent surface scald and the like, has fine texture and good mechanical property, is not added with harmful substances in the preparation process, is very environment-friendly, and can meet the actual requirements of furniture (such as sofas, massage chairs and the like), home decoration (such as wall soft decoration of background walls and the like or other soft decoration) and artware (such as leather pen holders, leather ornaments, leather clasps and the like).
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. The flame-retardant leather comprises a surface layer, an intermediate base material layer, a bottom layer and a base fabric layer which are sequentially bonded, and is characterized in that the surface layer comprises the following components in parts by weight:
80-100 parts of organic silica gel;
8-10 parts of a hardening agent;
10-30 parts of modified layered double hydroxide;
6-12 parts of dimethyl silicone oil;
the ratio of the weight parts of the modified nano silicon dioxide to the weight parts of the modified layered double hydroxide is not less than 8%, and the ratio of the weight parts to the total weight parts of the modified nano silicon dioxide is not more than 1.9%;
the modified layered double hydroxide is prepared by modifying sodium stearate and layered double hydroxide according to the weight part ratio of (3-5) to 100;
the modified nano silicon dioxide is prepared from propyl trimethylsilane and nano silicon dioxide according to the weight ratio of (12-18): 100 parts by weight of the modified starch;
the dimethyl silicone oil consists of high-viscosity dimethyl silicone oil and low-viscosity dimethyl silicone oil, the viscosity value of the high-viscosity dimethyl silicone oil is 100-300mPa & s/25 ℃, the viscosity value of the low-viscosity dimethyl silicone oil is not more than 50mPa & s/25 ℃, and the weight part of the low-viscosity dimethyl silicone oil is 2-3.
2. The method for preparing the flame-retardant leather according to claim 1, comprising the following steps:
s1, preparing a surface layer:
mixing 80-100 parts of organic silica gel, 8-10 parts of hardening agent and 10-30 parts of modified layered double hydroxide to form primary slurry;
adjusting the viscosity of the primary slurry to 100000-120000 mPa.s/25 ℃ by using 4-9 parts of high-viscosity dimethyl silicone oil with the viscosity value of 100-300 mPa.s/25 ℃ to form secondary slurry;
mixing a certain amount of modified nano-silica into the secondary slurry, and fully stirring to form tertiary slurry, wherein the ratio of the weight parts of the modified nano-silica to the weight parts of the modified layered double hydroxide is not less than 8%, and the ratio of the weight parts of the modified nano-silica to the total weight parts of the modified layered double hydroxide is not more than 1.9%;
coating the third sizing agent on the surface of release paper/film, wherein the coating thickness is 0.1mm, and then inputting the release paper/film into a multi-section temperature difference oven, wherein the multi-section temperature difference oven is sequentially provided with a low-temperature region at 110 ℃, a medium-temperature region at 120 ℃ and a high-temperature region at 130 ℃, a coating film is baked in the low-temperature region for 1min, and is baked in the medium-temperature region for 2 min;
uniformly coating 2-3 parts of low-viscosity dimethyl silicone oil with the viscosity value not more than 50mPa & s/25 ℃ on the coating film output from the medium temperature area, and then inputting the coating film into the high temperature area to be baked for 1min to obtain a surface layer;
and S2, sequentially finishing the manufacture of the middle base material layer, the bottom layer and the base fabric layer.
3. The method for preparing flame-retardant leather according to claim 2, wherein the modified layered double hydroxide is prepared by:
adding sodium stearate and layered double hydroxide into a reaction kettle according to the weight ratio of (3-5) to 100, stirring for 1 hour at the temperature of 75-85 ℃, and ultrasonically dispersing once every 3-5 minutes at the interval of 10-15 minutes.
4. The method for preparing the flame-retardant leather according to claim 2, wherein the modified nano-silica is prepared by the following steps:
adding a certain amount of propyl trimethyl silane into the hydrolysate, and hydrolyzing at 70-75 ℃ for 30 +/-5 min to obtain a hydrolysis reactant; adding a certain amount of nano silicon dioxide into a certain amount of absolute ethyl alcohol, and performing ultrasonic dispersion for 10-15min to obtain a dispersion liquid; heating the hydrolysis reactant and the dispersion liquid to 80-85 ℃ in a reaction kettle, stirring for 4 hours at constant temperature, and cooling to room temperature to obtain cooling liquid; carrying out centrifugal separation on the cooling liquid, and drying to constant humidity to obtain modified nano silicon dioxide;
the hydrolysate is prepared from ethanol with volume fraction of more than 75% and hydrochloric acid with concentration of 0.1mol/L according to the weight ratio of 1: 1 volume is prepared;
the adding proportion of each material is as follows:
12-18g of propyltrimethylsilane; 100g of nano silicon dioxide; 1000mL of hydrolysate; 500ml of absolute ethyl alcohol.
5. Use of a flame-retardant leather according to claim 1, characterized in that: it is applied to furniture, home decoration and artware.
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Effective date of registration: 20211201 Address after: 361000 room 21d, No. 59, Hubin North Road, Siming District, Xiamen City, Fujian Province Patentee after: XIAMEN XINCHUANGLI CHEMICAL CO.,LTD. Address before: 361000 No. 769, Tong Tang Industrial Area, Tongan District, Xiamen, Fujian. Patentee before: XIAMEN XINCUANGLI SILICA GEL Co.,Ltd. |