Fox fur chrome-free tanning processing technology

Abstract

The invention provides a fox fur chrome-free tanning processing technology, and belongs to fine fur leather processing. Firstly, to-be-treated fox fur is sequentially subjected to degreasing treatment and softening treatment, then an F-90 tanning agent is used for pretanning, the fiber structure of the fur can be preliminarily fixed, gaps between fibers are enlarged, a smooth way is provided for subsequent permeation of the compound vegetable tanning agent, combination of tannin in the compound vegetable tanning agent and fur collagen is facilitated, and the tanning effect of the fox fur is improved. The compound vegetable tanning agent can accelerate penetration and dispersion of tannin into fur and avoid surface over tanning, so that the tanning time is shortened, the combining amount is increased, a good chrome-free tanning effect is achieved, the comprehensive effect of combined tanning is remarkably improved by controlling the composition of the compound vegetable tanning agent, the softness, shrinkage temperature and fullness of a product are improved, and the product quality is improved through dyeing and later finishing. The fox fur finished product with excellent comprehensive performance is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of fine fur leather processing, in particular to a chrome-free tanning process for fox fur. Background Art

[0002] As we all know, fur has a long history and tradition in China. China has always had breeding, dyeing and clothing manufacturing industries, and is a major exporter and consumer of fur clothing. Today, the fur industry is developing rapidly in China, and production technology has gradually reached international standards. Fur refers to clothing made from animal fur, which has the function of keeping warm. In the fur industry, mink fur, fox fur, raccoon fur, yellow wolf fur, rabbit fur, etc. are usually called fine fur, while the fur of cattle, horses, sheep, pigs, dogs and other animals is called rough fur. Tanning is an important link in the processing of fur leather. Tanning is a process in which tanning agent molecules penetrate into the skin and combine with the active groups of raw skin collagen molecules to change their properties. Tanning generates cross-linked bonds between the collagen polypeptide chains in the skin, increases the stability of the collagen structure, increases the shrinkage temperature and moisture and heat stability, and improves the ability to resist acids, alkalis, enzymes and other chemicals.

[0003] At present, tanning mainly includes chrome tanning and vegetable tanning, as well as aldehyde tanning, oil tanning, aluminum tanning, zirconium tanning, combined tanning, alum tanning, formaldehyde tanning, etc. However, all of the above methods have defects to varying degrees. Among them, chrome tanning agents are widely used in the leather industry due to their excellent tanning properties, but the environmental problems they bring cannot be ignored, and the pollution control costs are high, which seriously affects the economic benefits of leather enterprises. In addition, since the color of the leather board is lake blue, it will affect the judgment of the color when dyeing light-colored fur.

[0004] The existing technology has studied the tanning of degradable vegetable tanning agents and non-toxic and harmless organic tanning agents, such as F-90. The main chemical component of F-90 is sodium p-[(4,6-dichloro-1,3,5-triazine-2-yl)amino]benzenesulfonate. The -C1 on the molecule can react with the -NH 2Produce covalent bonding, the negatively charged sulfonic acid group can produce ionic forces with the positively charged amino groups on the collagen peptide chain, and the positively charged amino groups can produce ionic forces with the negatively charged oxygen on the collagen peptide chain. However, when F-90 is tanned alone, the shrinkage temperature of the wet white leather obtained by tanning is low, the fullness is insufficient, it is flat and thin, and the resilience is poor. Vegetable tanned leather is tanned mainly with vegetable tanning agents. The leather body is firm, solid and full, with low elongation and good formability. The heat shrinkage temperature can reach above 80°C, and it is biodegradable, non-toxic to the human body, and has little pollution to the environment. However, the softness of vegetable tanned leather cannot meet the quality requirements of light leather. In order to improve the softness and physical and mechanical properties of vegetable tanned leather, leather technology workers have conducted a lot of research on the combined tanning method of aldehyde tanning agents, metal salt tanning agents and vegetable tanning agents, and have also achieved certain results. The vegetable-aldehyde combined tanning method and the vegetable-chrome combined tanning method are typical representative methods. However, these methods will cause the finished leather to contain a certain amount of aldehydes and heavy metal chromium, which will have an adverse effect on the ecological and environmental protection of leather products. Summary of the invention

[0005] The object of the present invention is to provide a chrome-free tanning process for fox fur. The processing technology provided by the present invention adopts F-90 tanning agent and compound vegetable tanning agent for pre-tanning and combined tanning respectively to realize chrome-free tanning, and the prepared fox fur finished product has high softness, high shrinkage temperature and good fullness.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The present invention provides a chrome-free tanning process for fox fur, which is characterized by comprising the following steps:

[0008] (1) subjecting the fox fur to be treated to a degreasing treatment and a softening treatment in sequence to obtain softened fox fur;

[0009] (2) pre-tanning the softened fox fur obtained in step (1) with F-90 tanning agent and allowing to stand to obtain pre-tanned fox fur;

[0010] (3) using a compound vegetable tanning agent to perform combined tanning on the pre-tanned fox fur obtained in step (2) to obtain tanned fox fur;

[0011] The compound vegetable tanning agent comprises at least one of rubber bowl tannin extract, acacia mangium tannin extract and myrica pubescens tannin extract;

[0012] (4) The tanned fox fur obtained in step (3) is dyed and post-finished in sequence to obtain a finished fox fur product.

[0013] Preferably, the treatment agent used for the degreasing treatment in step (1) comprises 0.8 to 2 g / L of soda ash, 0.8 to 2 g / L of penetrant, and 3 to 6 g / L of degreasing agent.

[0014] Preferably, the degreasing treatment in step (1) is carried out under intermittent rotation conditions, the degreasing treatment temperature is 28 to 34° C., and the degreasing treatment time is 1 to 4 hours.

[0015] Preferably, the softening treatment in step (1) is carried out under intermittent rotation conditions, the softening treatment temperature is 30 to 45° C., and the softening treatment time is 4 to 8 hours.

[0016] Preferably, the softening agent used in the softening treatment in step (1) comprises 4-6 mL / L formic acid, 0.5-2 mL / L sulfuric acid, and 30-50 g / L salt.

[0017] Preferably, in the step (2), the concentration of the F-90 tanning agent in the pre-tanning liquid used for pre-tanning is 10 wt% to 13 wt%.

[0018] Preferably, the pre-tanning in step (2) is carried out under intermittent rotation conditions, the pre-tanning temperature is 40-45° C., and the pre-tanning time is 8-12 hours.

[0019] Preferably, the standing still in step (2) is standing still at room temperature for 12 to 24 hours.

[0020] Preferably, in the compounded vegetable tanning agent in step (3), 2wt% to 4wt% of rubber bowl tannin extract, 10wt% to 14wt% of Acacia mangium tannin extract, and 4wt% to 8wt% of Myrica pubescens tannin extract are contained.

[0021] Preferably, the combined tanning in step (3) is carried out under intermittent rotation conditions, the combined tanning temperature is 40 to 45° C., and the combined tanning time is 8 to 12 hours.

[0022] The invention provides a chrome-free tanning process for fox fur. First, the fox fur to be processed is degreased and softened in sequence to facilitate subsequent further processing. Then, an F-90 tanning agent is used to pre-tan and stand the softened fox fur. Then, a compound vegetable tanning agent containing certain components is used for combined tanning. The pre-tanning with the F-90 tanning agent can preliminarily fix the fiber structure of the fur, increase the gaps between the fibers, and further disperse and preliminarily shape the fibers of the fur, providing a smooth path for the subsequent penetration of the compound vegetable tanning agent, facilitating the combination of tannins in the compound vegetable tanning agent with fur collagen, accelerating the penetration and dispersion of tannins into the fur, avoiding surface over-tanning, thereby shortening the tanning time, increasing the binding amount, and achieving a better tanning effect. By controlling the composition of the compound vegetable tanning agent, the comprehensive effect of the combined tanning is significantly improved, which is beneficial to improving the softness, shrinkage temperature, and fullness of the product. After dyeing and post-finishing, a fox fur product with excellent comprehensive performance is obtained. Compared with traditional chrome tanning, the F-90 tanning agent used in the present invention has less pollution to the environment, and the use of the compound vegetable tanning agent further reduces the emission of harmful substances, which is beneficial to environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a bar chart showing the heat shrinkage temperature of fox fur products obtained by processing in Examples 1 to 8 of the present invention and Comparative Examples 1 and 2;

[0024] Figure 2 This is a bar chart showing the sensory properties of the fox fur products obtained by Examples 1 to 8 of the present invention and Comparative Examples 1 and 2. DETAILED DESCRIPTION

[0025] The present invention provides a chrome-free tanning process for fox fur, which is characterized by comprising the following steps:

[0026] (1) subjecting the fox fur to be treated to a degreasing treatment and a softening treatment in sequence to obtain softened fox fur;

[0027] (2) pre-tanning the softened fox fur obtained in step (1) with F-90 tanning agent and allowing to stand to obtain pre-tanned fox fur;

[0028] (3) using a compound vegetable tanning agent to perform combined tanning on the pre-tanned fox fur obtained in step (2) to obtain tanned fox fur;

[0029] The compound vegetable tanning agent comprises at least one of rubber bowl tannin extract, acacia mangium tannin extract and myrica pubescens tannin extract;

[0030] (4) The tanned fox fur obtained in step (3) is dyed and post-finished in sequence to obtain a finished fox fur product.

[0031] In the present invention, unless otherwise specified, the raw materials used are conventional commercial products in the art.

[0032] The invention sequentially performs degreasing treatment and softening treatment on fox fur to be treated to obtain softened fox fur.

[0033] In the present invention, the treatment agent used for the degreasing treatment includes 0.8-2 g / L of soda ash, 0.8-2 g / L of penetrant, and 3-6 g / L of degreasing agent. In the present invention, the penetrant is preferably at least one of penetrant JFC-1, penetrant JFC-2, and penetrant JFC-E. In the present invention, the degreasing agent is preferably at least one of lipase and amylase. In the present invention. The degreasing treatment is preferably carried out under intermittent rotation conditions, the temperature of the degreasing treatment is preferably 28-34°C, and the time of the degreasing treatment is preferably 1-4 hours. The present invention can effectively remove excess grease in fox fur through degreasing treatment, making the fur cleaner and fresher. After the grease is removed, the fiber structure of the fur is clearer, which is beneficial to subsequent processing and treatment. The degreased fur is easier to absorb dyes, and the dyeing effect is more uniform and brighter. The degreasing treatment can also reduce the adhesion of dyes on the fur surface and improve the fastness of dyeing; it can also improve the feel of the fur. The degreased fur feels softer and smoother, which improves the comfort of the fur. Removing the grease can also reduce the odor of the fur, making it more refreshing and pleasant. The degreasing treatment can also reduce the corrosive effect of the grease in the fur on the fiber, prolonging the service life of the fur. The degreased fur is more wear-resistant and not easy to deform, which improves the durability of the fur.

[0034] After the degreasing treatment, the present invention preferably performs water-spinning and washing in sequence on the degreasing product.

[0035] The present invention removes residual reagents after degreasing treatment by water removal and washing, which is beneficial to the subsequent softening treatment.

[0036] In the present invention, the softening treatment is preferably carried out under intermittent rotation conditions, the softening treatment temperature is preferably 30-45°C, and the softening treatment time is preferably 4-8 hours. In the present invention, the softening agent used in the softening treatment includes 4-6 mL / L formic acid, 0.5-2 mL / L sulfuric acid, and 30-50 g / L salt. The present invention can make the fibers of fox fur softer and more elastic through softening treatment, thereby improving the flexibility of the fur; the softened fur is easier to bend and fold, and is not easy to break or damage; the softening treatment can improve the feel of the fur, making it more delicate and soft, and the softened fur is more in line with human skin, thereby improving the wearing comfort; the softening treatment can make the fur hair smoother and more shiny, thereby improving the appearance quality of the fur; the softened fur is easier to take care of and maintain, thereby reducing the maintenance cost of the fur; the softening treatment can improve the processing performance of the fur, thereby making it easier to cut, sew and shape; the softened fur is more suitable for making high-end clothing and accessories, thereby improving the added value of the fur.

[0037] After the softening treatment, the present invention preferably performs water removal and washing in sequence on the softened product.

[0038] The invention removes residual reagents after softening treatment by water-drying and washing, which is beneficial to subsequent pre-tanning and obtains softened fox fur.

[0039] After obtaining the softened fox fur, the present invention uses F-90 tanning agent to pre-tan and stand the softened fox fur to obtain pre-tanned fox fur.

[0040] In the present invention, the concentration of the F-90 tanning agent in the pretanning liquid used for the pretanning is preferably 10wt% to 13wt%. In the present invention, the pretanning is preferably carried out under intermittent rotation conditions, the pretanning temperature is preferably 40 to 45°C, and the pretanning time is preferably 8 to 12h. In the present invention, the liquid ratio of the pretanning is preferably 10% to 40%, more preferably 15% to 35%. The present invention utilizes the F-90 tanning agent to effectively combine with the fibers of fox fur, so that the fur can more easily achieve the ideal tanning effect in the subsequent combined tanning process, and can make the fur fibers softer and more elastic. Compared with traditional chrome tanning agents, the F-90 tanning agent does not contain chromium elements, so no chromium-containing wastewater will be generated during use, which helps to reduce environmental pollution; the F-90 tanning agent can evenly penetrate into the fibers of the fur, making the fur softer and smoother, while improving the wear resistance and tear resistance of the fur, and pretanning can also reduce the damage of the fur in the subsequent processing process, and improve the yield and quality of the fur.

[0041] In the present invention, the standing is preferably standing at room temperature for 12 to 24 hours. The present invention utilizes the standing process to allow the F-90 tanning agent to more fully penetrate into the fibers of the fur, making the tanning effect of the fur more uniform and stable, and helping the chemical reaction between the F-90 tanning agent and the fur fibers to be more complete, thereby improving the tanning quality of the fur; the standing process can reduce the number of stirring and turning times in the subsequent tanning process, thereby reducing production costs and improving production efficiency; the standing process can also allow the fur to absorb the tanning agent more evenly during the tanning process, reducing tanning time and energy consumption; the standing treatment can make the fibers of the fur more closely combined, improving the elasticity and wear resistance of the fur, and at the same time, the standing process also helps to reduce the shrinkage and deformation of the fur during the subsequent processing process, and improve the dimensional stability and shape retention of the fur.

[0042] After the pre-tanned fox fur is obtained, the invention adopts a compound vegetable tanning agent to carry out combined tanning on the pre-tanned fox fur to obtain the tanned fox fur.

[0043] In the present invention, the compound vegetable tanning agent preferably includes at least one of tannin from cassia bark, acacia mangium extract and myrica pubescens extract. In the present invention, the compound vegetable tanning agent more preferably contains 2wt% to 4wt% of tannin from cassia bark, 10wt% to 14wt% of acacia mangium extract and 4wt% to 8wt% of myrica pubescens extract. The present invention utilizes the characteristics of rubber bowl tannin in the tanning process, which has fast penetration, good filling property and light color, and gives the fur good softness and elasticity; utilizes the antiseptic effect of Acacia mangium tannin; utilizes the advantages of strong collagen binding force and bright color of Myrica pubescens tannin; the three tannins are used in combination to make full use of their respective advantages, complement each other and improve the tanning effect; the compound vegetable tanning agent has stronger penetration and binding force, and makes the fur softer, fuller and more wear-resistant; through compound use, the color, softness, elasticity and other properties of the fur can be adjusted to meet the needs of different customers; the compound vegetable tanning agent can also improve the air permeability and durability of the fur; the vegetable tanning agent is more environmentally friendly than the chemical tanning agent, and does not pollute the environment; at the same time, the compound vegetable tanning agent can also improve the yield and quality, and increase the economic benefits of the enterprise.

[0044] In the present invention, the combined tanning is preferably carried out under intermittent rotation conditions, the combined tanning temperature is preferably 40-45°C, and the combined tanning time is preferably 8-12 hours. In the present invention, the liquid ratio of the combined tanning is preferably 80%-140%, more preferably 95%-120%. The present invention achieves a better tanning effect through combined tanning, making the fur softer, fuller and more wear-resistant. Through compound use, the color, softness, elasticity and other properties of the fur can be adjusted to meet the needs of different customers.

[0045] After obtaining the tanned fox fur, the present invention sequentially dyes and performs post-processing on the tanned fox fur to obtain a finished fox fur product.

[0046] The present invention has no special limitation on the dyeing and post-processing methods, and any technical solution well known in the art may be used.

[0047] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Example 1

[0049] A chrome-free tanning process for fox fur, comprising the following steps:

[0050] (1) Mix the fox fur to be treated with a treatment agent, perform a degreasing treatment at 32° C. for 3 h with intermittent rotation, remove the fur and spin off the water, then rinse it twice with clean water, then mix it with a softening agent, perform a softening treatment at 45° C. for 6 h with intermittent rotation, remove the fur and spin off the water, then rinse it twice with clean water to obtain softened fox fur;

[0051] The treatment agent used in the degreasing treatment includes 1 g / L of soda ash, 1 g / L of penetrant JFC-2, and 4 g / L of degreasing agent amylase; the softening agent used in the softening treatment includes 6 mL / L of formic acid, 1 mL / L of sulfuric acid, and 40 g / L of salt.

[0052] (2) mixing an aqueous solution of F-90 tanning agent having a concentration of 10 wt % with the softened fox fur obtained in step (1), pre-tanning the mixture at 43° C. for 10 h with intermittent rotation, and then standing the mixture at room temperature for 12 h, and taking the mixture out to obtain pre-tanned fox fur;

[0053] The pre-tanning liquid ratio is 20%;

[0054] (3) tanning the pre-tanned fox fur obtained in step (2) with a composite vegetable tanning agent at 45° C. for 10 hours under intermittent rotation to obtain tanned fox fur;

[0055] The compound vegetable tanning agent is an aqueous solution containing tannin extract from cassia bark, acacia mangium extract and myrica pubescens extract, wherein the aqueous solution contains 3 wt % of tannin extract from cassia bark, 14 wt % of acacia mangium extract and 8 wt % of myrica pubescens extract;

[0056] The liquid ratio of the combined tanning is 110%;

[0057] (4) The tanned fox fur obtained in step (3) is dyed in a water bath at a temperature of 70° C., and the fur board is dyed with an acid dye, and then processed with a stretching machine and a drum equipment to achieve the softness requirement, and then cut into pieces and put into storage to obtain the finished fox fur.

[0058] Example 2

[0059] The fox fur was subjected to chrome-free tanning according to the method of Example 1, except that an 11.5 wt% F-90 tanning agent aqueous solution was used in step (2).

[0060] Example 3

[0061] The fox fur was subjected to chrome-free tanning according to the method of Example 1, except that a 13 wt% F-90 tanning agent aqueous solution was used in step (2).

[0062] Example 4

[0063] The fox fur was subjected to chrome-free tanning according to the method of Example 1, except that the standing time in step (2) was 18 hours.

[0064] Example 5

[0065] The fox fur was subjected to chrome-free tanning according to the method of Example 1, except that the standing time in step (2) was 24 hours.

[0066] Example 6

[0067] The fox fur is subjected to chrome-free tanning according to the method of Example 1, except that the compound vegetable tanning agent in step (3) comprises an aqueous solution of 3 wt% of cassia tartrate extract, 12 wt% of acacia mangium extract and 6 wt% of myrica oleifera extract.

[0068] Example 7

[0069] The fox fur is subjected to chrome-free tanning according to the method of Example 1, except that the compound vegetable tanning agent in step (3) comprises an aqueous solution of 3 wt % of cassia tartrate extract, 12 wt % of acacia mangium extract and 8 wt % of bayberry extract.

[0070] Example 8

[0071] The fox fur is subjected to chrome-free tanning according to the method of Example 1, except that the compound vegetable tanning agent in step (3) comprises an aqueous solution of 4 wt% of cassia tartrate extract, 12 wt% of acacia mangium extract and 8 wt% of myrica oleifera extract.

[0072] Comparative Example 1

[0073] The fox fur was subjected to chrome-free tanning according to the method of Example 1, except that the F-90 tanning agent was not used for pre-tanning.

[0074] Comparative Example 2

[0075] The fox fur is subjected to chrome-free tanning according to the method of Example 1, except that no compound vegetable tanning agent is used for combined tanning.

[0076] The heat shrinkage temperature and tear strength of the fox fur products obtained by Examples 1 to 8 and Comparative Examples 1 and 2 were tested, and the sensory properties were evaluated. The results are shown in Table 1.

[0077] The heat shrinkage temperature is tested using a digital leather shrinkage temperature tester and measured according to QB / T1873-2010 standard.

[0078] Among the sensory properties, fullness was evaluated by sensory method, with a maximum of 5 points and a minimum of 1 point; softness was measured by a softness tester in accordance with ISO17235-2002 standard.

[0079] The tear strength is tested according to QB / T2711-2005.

[0080] Figure 1 This is a bar chart showing the heat shrinkage temperature of the fox fur products obtained by processing in Examples 1 to 8 and Comparative Examples 1 and 2. Figure 2 It is a bar chart of sensory performance.

[0081] Table 1 Statistics of heat shrinkage temperature, tear strength and sensory properties of fox fur products obtained from Examples 1 to 8 and Comparative Examples 1 and 2

[0082] Finished Product Heat shrinkage temperature (℃) Fullness Softness Tear strength(N / mm) Example 1 84.0 4.2 4.7 104.83 Example 2 84.7 4.3 4.7 105.65 Example 3 85.1 4.2 4.9 106.17 Example 4 84.3 4.3 4.7 107.25 Example 5 84.6 4.5 5.0 108.41 Example 6 85.0 4.6 5.0 109.57 Example 7 85.0 4.7 5.0 109.33 Example 8 85.4 4.8 5.0 111.76 Comparative Example 1 81.9 3.7 3.6 94.69 Comparative Example 2 80.1 3.5 3.1 88.37

[0083] In summary, compared with the comparative example, the chrome-free tanning process for fox fur provided by the present invention adopts F-90 tanning agent and compound vegetable tanning agent for pre-tanning and combined tanning respectively, to achieve chrome-free tanning, and the prepared fox fur finished product has high softness, high shrinkage temperature, good fullness, and high mechanical properties.

[0084] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A chrome-free tanning process for fox fur, characterized in that: The following steps are involved: (1) subjecting the fox fur to be treated to a degreasing treatment and a softening treatment in sequence to obtain softened fox fur; (2) pre-tanning the softened fox fur obtained in step (1) with F-90 tanning agent and allowing to stand to obtain pre-tanned fox fur; (3) using a compound vegetable tanning agent to perform combined tanning on the pre-tanned fox fur obtained in step (2) to obtain tanned fox fur; The compound vegetable tanning agent comprises at least one of rubber bowl tannin extract, acacia mangium tannin extract and myrica pubescens tannin extract; (4) The tanned fox fur obtained in step (3) is dyed and post-finished in sequence to obtain a finished fox fur product.

2. The chrome-free tanning process for fox fur according to claim 1, characterized in that: The treatment agent used for the degreasing treatment in step (1) includes 0.8-2 g / L of soda ash, 0.8-2 g / L of penetrant, and 3-6 g / L of degreasing agent.

3. The chrome-free tanning process for fox fur according to claim 1, characterized in that: The degreasing treatment in step (1) is carried out under intermittent rotation conditions, the degreasing treatment temperature is 28 to 34° C., and the degreasing treatment time is 1 to 4 hours.

4. The chrome-free tanning process for fox fur according to claim 1, characterized in that: The softening treatment in step (1) is carried out under intermittent rotation conditions, the softening treatment temperature is 30 to 45° C., and the softening treatment time is 4 to 8 hours.

5. The chrome-free tanning process for fox fur according to claim 1, characterized in that: The softening agent used in the softening treatment in step (1) includes 4-6 mL / L formic acid, 0.5-2 mL / L sulfuric acid, and 30-50 g / L salt.

6. The chrome-free tanning process for fox fur according to claim 1, characterized in that: In the step (2), the concentration of the F-90 tanning agent in the pre-tanning liquid used for pre-tanning is 10 wt% to 13 wt%.

7. The chrome-free tanning process for fox fur according to claim 1, characterized in that: In the step (2), the pre-tanning is carried out under intermittent rotation conditions, the pre-tanning temperature is 40-45° C., and the pre-tanning time is 8-12 hours.

8. The chrome-free tanning process for fox fur according to claim 1, characterized in that: The step (2) of standing is standing at room temperature for 12 to 24 hours.

9. The chrome-free tanning process for fox fur according to claim 1, characterized in that: In the compounded vegetable tanning agent in step (3), 2wt% to 4wt% of rubber bowl tannin extract, 10wt% to 14wt% of acacia mangium tannin extract, and 4wt% to 8wt% of myrica pubescens tannin extract are contained.

10. The chrome-free tanning process for fox fur according to claim 1, characterized in that: In the step (3), the combined tanning is carried out under intermittent rotation conditions, the combined tanning temperature is 40 to 45° C., and the combined tanning time is 8 to 12 hours.

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