Formaldehyde and odor removal composition for leather processing and application of formaldehyde and odor removal composition

Abstract

The invention relates to a formaldehyde and odor removal composition for leather processing and application thereof. The formaldehyde and odor removal composition comprises tea polyphenol, nano manganese oxide, nano zinc oxide, ethyl acetate, ethylidene urea, polyethyleneimine, cysteine, sulfated castor oil and water. Wherein the combination of the tea polyphenol, the nano zinc oxide, the ethyl acetate and the sulfated castor oil has a synergistic effect in the aspect of odor removal; the combination of ethylidene urea, polyethyleneimine, cysteine and nano manganese oxide has a synergistic effect in the aspect of formaldehyde removal, and meanwhile, the invention also finds that the two combinations also play the synergistic effect in the aspect of formaldehyde removal and odor removal. The composition provided by the invention not only can remove free formaldehyde, but also has a very good removal effect on acetaldehyde and acrolein, does not need to add the existing process procedures during use, does not reduce the properties such as hand feeling softness of leather products and the like, and also can meet the requirements on high efficiency and energy conservation.

Description

Technical Field

[0001] The invention belongs to the field of leather industry processing and relates to a composition for removing formaldehyde and odor for genuine leather manufacturing and application thereof. Background Art

[0002] In the production process of leather, especially in tanning and dyeing processes, various chemical reagents and materials are often used. The use of these chemicals will inevitably lead to a certain amount of aldehydes such as formaldehyde, acetaldehyde, acrolein and other aldehydes remaining in leather products, as well as unpleasant odors. Formaldehyde has a strong irritation to human mucous membranes, and it is easy to cause local skin necrosis when it touches the skin. It is rated as a Class 1 carcinogen by the World Health Organization; low concentrations of acetaldehyde can cause irritation symptoms to the eyes, nasal cavity and upper respiratory tract, and even bronchitis. It is rated as a Class 2B carcinogen by the World Health Organization; acrolein is a strong irritant, and inhalation can damage the respiratory tract, causing symptoms such as pharyngitis and bronchitis. It is rated as a Class 3 carcinogen by the World Health Organization.

[0003] At present, there are some methods for removing formaldehyde and odor from leather in the industry, but most of them have problems such as unsatisfactory effects, high costs or excessive energy consumption. For example, free formaldehyde is removed by using amine-containing substances, but this material is not effective in removing acetaldehyde and acrolein, which are also harmful to the human body; secondly, there is a method of removing formaldehyde substances by combining with negative oxygen ions. This produces negative oxygen ions through the electron ionization reaction released by minerals. Its mineral radiation will have some negative effects on health, and its formaldehyde removal effect is not as efficient as that of free formaldehyde removal by amine-containing substances; in addition, the automotive industry also uses a 12-hour 60°C high-temperature hanging and baking method to remove formaldehyde and irritating odors. This method consumes a lot of energy, which violates the current global warming demand for environmental protection and the company's demand for cost reduction and efficiency improvement. Finding energy-saving manufacturing methods is also a research focus.

[0004] As consumers' requirements for product quality and environmental protection continue to increase, more and more leather products are reported to have odor problems in the market. Therefore, it is urgent to invent an effective and safe processing method that can comprehensively remove aldehydes and irritating odors to meet the market's expectations and needs for automotive leather materials. This method has important practical significance and market value. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide a composition for removing formaldehyde and odor for leather manufacturing and its application.

[0006] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a composition for removing formaldehyde and deodorizing for leather processing, wherein the composition comprises tea polyphenols, nano manganese oxide, nano zinc oxide, ethyl acetate, ethylene urea, polyethylene imine, cysteine, sulfated castor oil and water.

[0008] The composition involved in the present invention has a significant effect of removing formaldehyde and deodorizing, wherein the combination of tea polyphenols, nano zinc oxide, ethyl acetate and sulfated castor oil has a synergistic effect in removing odor; the combination of ethylene urea, polyethylene imine, cysteine ​​and nano manganese oxide has a synergistic effect in removing formaldehyde, and the present invention also finds that the two combinations also have a synergistic effect in removing formaldehyde and deodorizing. The combination provided by the present invention can not only remove free formaldehyde, but also has a good removal effect on acetaldehyde and acrolein. The composition provided by the present invention does not need to increase the existing process steps when used, will not reduce the softness of leather products and other properties, and also meets the demand for high efficiency and energy saving.

[0009] Preferably, the formaldehyde and deodorizing composition comprises, by weight, 5-15 parts of tea polyphenols, 1-10 parts of nano manganese oxide, 1-10 parts of nano zinc oxide, 10-30 parts of ethyl acetate, 10-30 parts of ethylene urea, 10-30 parts of polyethylene imine, 10-30 parts of cysteine, 1-5 parts of sulfated castor oil and 50-90 parts of water.

[0010] The weight proportions of the tea polyphenols can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, etc.

[0011] The nano manganese oxide can be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, etc.

[0012] The nano zinc oxide can be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, etc.

[0013] The ethyl acetate can be 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, etc.

[0014] The ethylene urea may be 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, etc.

[0015] The polyethyleneimine can be 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, etc.

[0016] The cysteine ​​may be 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, etc.

[0017] The sulfated castor oil can be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, etc.

[0018] The water can be 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, 90 parts, etc.

[0019] Any other specific point value within the above numerical range can be selected, and will not be described in detail here.

[0020] In a second aspect, the present invention provides a use of the composition for removing formaldehyde and deodorizing for leather processing according to the first aspect in leather manufacturing.

[0021] Preferably, the composition for removing formaldehyde and deodorizing is added to the retanning liquid and / or the sealing liquid during the leather processing.

[0022] The composition for removing formaldehyde and deodorizing of the present invention has excellent effect of removing formaldehyde and deodorizing. It can be foreseen that the composition can achieve the effect of removing formaldehyde and deodorizing by being applied to leather manufacturing processes including retanning process and / or rolling process in the art. Here, a common leather processing method is only given as an example, comprising the following steps:

[0023] Batch grouping: Put hides of similar size and thickness into the same drum for processing;

[0024] Soaking: Add water to the drum to soak the hides, and add pH regulator to adjust the pH to 7.5-8.5, the soaking temperature is 25-28℃, and the soaking time is 15-25h;

[0025] Fleshing: Take out the raw hides that have been soaked in water, and remove the hair and flesh on the surface of the raw hides;

[0026] Liming: Put the fleshed hides in a drum and soak them in alkali solution with a pH of 11-12 at a temperature of 25-28°C for 15-25 hours.

[0027] Deliming: After liming, drain the alkali solution and add 25-35℃ clean water to wash the hides until the pH of the washing liquid is 7-8;

[0028] Softening: Use enzyme preparation to treat the delimed hides, control the pH at 7.8-8.2, the temperature at 30-35℃, and the time at 40-60min;

[0029] Acid soaking: After softening, add acid solution with a pH of 2.5-3 to the drum for soaking. The soaking temperature is 22-28°C and the soaking time is 2-5h.

[0030] Tanning: Add tanning agent into the drum, control the pH of tanning at 3.4-3.8, the temperature at 38-40℃, and the time at 10-13h. After tanning, let it stand for 5-8h to obtain blue leather;

[0031] Retanning: immerse the blue leather in the retanning solution at a temperature of 15-40°C for 1-4 hours;

[0032] Pre-dyeing treatment: After retanning, squeeze out water, peel and shave, then add alkali solution to control the pH of the solution in the drum at 5.8-6.2;

[0033] Dyeing: Add dye to the drum, control the temperature at 25-35°C, dye for 0.5-1.5h to obtain dyed leather;

[0034] Fatliquoring: Add grease to the drum where the dyed leather is, control the temperature at 50-55℃, the time is 60-90min, and the pH is 5-6;

[0035] Pre-treatment before finishing: The leather after fatliquoring is squeezed and stretched, vacuum dried, hung and aired, and oscillated and softened, then stretched at 40-45℃, and then polished and polished in sequence;

[0036] Finishing: Spray the finishing liquid on the front of the leather;

[0037] Roller glue: Roll the sealing liquid onto the back of the leather, dry it, and finally get the finished genuine leather.

[0038] In a third aspect, the present invention provides a leather processing method, wherein the retanning process and / or the back rolling process in the leather processing comprises the following steps:

[0039] Retanning process: adding the composition for removing aldehyde and deodorizing described in the first aspect to the retanning liquid, placing the leather in the retanning liquid for retanning;

[0040] Rolling process: adding the formaldehyde-removing and deodorizing composition described in the first aspect to the sealing liquid, rolling the sealing liquid on the back of the leather, and drying.

[0041] Preferably, during the retanning process, the mass ratio of the formaldehyde-removing and deodorizing composition to the retanning liquid is 1:(4-6), for example 1:4, 1:4.5, 1:5, 1:5.5, 1:6, etc. Any other specific point value within this numerical range can be selected and will not be described here one by one.

[0042] Preferably, in the retanning process, the retanning temperature is 15-40°C (for example, 15°C, 17°C, 19°C, 21°C, 23°C, 25°C, 27°C, 29°C, 31°C, 33°C, 35°C, 37°C, 40°C, etc.), and the retanning time is 1-4h (1h, 1.5h, 2h, 2.5h, 3h, 3.5h, 4h, etc.). Any other specific point value within the above numerical range can be selected, and they will not be described one by one here.

[0043] Preferably, the retanning solution comprises chrome tanning agent, wattle extract, sulfited oil, sodium acetate and water.

[0044] Preferably, in the rolling process, the mass ratio of the formaldehyde-removing and deodorizing composition to the sealing liquid is 1:(1-3), for example, 1:1, 1:1.5, 1:2, 1:2.5, 1:3, etc. Any other specific point value within this numerical range can be selected, and they will not be described here one by one.

[0045] Preferably, in the back side rolling process, nano manganese oxide, nano zinc oxide, ethyl acetate, ethylene urea, polyethylene imine, cysteine, sulfated castor oil and sealing liquid are first mixed, and tea polyphenols are added when in use.

[0046] When using, tea polyphenols are mixed with water and added because tea polyphenols have antioxidant effects. As a reducing agent, they can easily react under solution conditions, resulting in a weakened deodorizing effect. This method has been proven to enhance the deodorizing effect.

[0047] Preferably, the sealing liquid comprises acrylic acid and water.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] The composition involved in the present invention has a significant effect of removing formaldehyde and deodorizing, wherein the combination of tea polyphenols, nano zinc oxide, ethyl acetate and sulfated castor oil has a synergistic effect in removing odor; the combination of ethylene urea, polyethylene imine, cysteine ​​and nano manganese oxide has a synergistic effect in removing formaldehyde, and the present invention also finds that the two combinations also have a synergistic effect in removing formaldehyde and deodorizing. The combination provided by the present invention can not only remove free formaldehyde, but also has a good removal effect on acetaldehyde and acrolein. The composition provided by the present invention does not need to increase the existing process steps when used, does not reduce the softness of leather products, and other properties, and also meets the demand for high efficiency and energy saving. DETAILED DESCRIPTION

[0050] In order to further explain the technical means and effects adopted by the present invention, the technical solution of the present invention is further described below in conjunction with the preferred embodiments of the present invention, but the present invention is not limited to the scope of the embodiments.

[0051] In the following examples, unless otherwise specified, the reagents and consumables used were purchased from conventional reagent manufacturers in the field; unless otherwise specified, the experimental methods and technical means used were conventional methods and means in the field.

[0052] The chrome tanning agent involved in the following examples is purchased from the Turkish SISECAM company Tankrom AB model product;

[0053] Wattle bark tannin extract was purchased from Stahl Company of the Netherlands, model BDR-VTA;

[0054] Sulfite oil was purchased from Smit&zoon, Netherlands, model BDR-IH;

[0055] Tea polyphenols were purchased from Chongqing Shunhe Metallurgical Furnace Material Technology Co., Ltd. Phenol T model product;

[0056] Polyethyleneimine was purchased from Chongqing Shunhe Metallurgical Furnace Material Technology Co., Ltd. as a product of model Amine P.

[0057] Example 1

[0058] This embodiment provides a leather processing method:

[0059] (1) Batch grouping: hides and skins of similar width and thickness are placed in the same drum for processing; soaking: add water to the drum to soak the hides and skins, add 25% ammonia water by mass, adjust the pH of the water in the drum to 7.5, and soak at 25°C for 25 hours; fleshing: take out the hides and skins that have been soaked in water, remove the hair on the surface of the hides and the flesh on the hides; liming: put the fleshed hides and skins in a drum, add sodium hydroxide solution with a pH of 11 to soak, and soak at 25°C for 25 hours; deliming: after liming, discharge the sodium hydroxide solution and add Add 25℃ clean water to wash the hides and skins until the pH value of the washing liquid is 7; softening: add 0.2kg pancreatic enzyme to treat the deliming hides and skins, the pH value is controlled at 7.8, the temperature is 30℃, and the time is controlled at 60min; pickling: after softening, add hydrochloric acid solution with a pH value of 2.5 to the drum for soaking, the soaking temperature is 22℃, and the soaking time is 5h; tanning: add basic chromium sulfate to the drum, the pH value of tanning is controlled at 3.4, the temperature is 38℃, and the time is controlled at 13h. After tanning, let it stand for 5h to obtain blue hides.

[0060] (2) Retanning:

[0061] 1) preparing a basic retanning solution: based on the weight of the leather embryo, weighing 150% of water, 2% of chrome tanning agent, 3% of wattle bark tannin, 1% of sulfited oil and 1% of sodium acetate; 2) mixing 10 parts of tea polyphenols, 5 parts of nano manganese oxide, 5 parts of nano zinc oxide, 20 parts of ethyl acetate, 20 parts of ethylene urea, 20 parts of polyethyleneimine, 20 parts of cysteine, 3 parts of sulfated castor oil and 70 parts of water in parts by weight, and then adding them into the basic retanning solution in a mass ratio of 1:5, immersing the blue leather obtained in (1) in the retanning solution for retanning at a temperature of 30°C for 3 hours.

[0062] (3) Pre-dyeing treatment: after retanning, the leather is squeezed, peeled and shaved, and then calcium hydroxide solution is added to control the pH of the solution in the drum to 5.8; dyeing: 0.1 kg of dye Reactive Red X-3B is added to the drum, the temperature is controlled at 30°C, the dyeing time is 1.5 h, and the dyed leather is obtained; greasing: 0.1 kg of chlorinated paraffin and 0.05 kg of cyclopentane ester are added to the drum where the dyed leather is located, the temperature is controlled at 50°C, the dyeing time is 90 min, and the pH is 5; pre-coating treatment: the leather after greasing treatment is squeezed, stretched, vacuum dried, hung and softened by vibration, and then stretched on a board at 40°C, and then polished and polished in sequence; finishing: a finishing liquid (60 parts of pigment paste, 250 parts of water, 300 parts of polyurethane adhesive, 150 parts of acrylic adhesive, and 50 parts of leveling agent) is prepared and sprayed on the leather surface.

[0063] (4) Roller rubber:

[0064] 1) Prepare basic sealing liquid: mix 144 parts of acrylic acid and 201 parts of water; 2) stir 5 parts of nano manganese oxide, 5 parts of nano zinc oxide, 20 parts of ethyl acetate, 20 parts of ethylene urea, 20 parts of polyethylene imine, 20 parts of cysteine, 3 parts of sulfated castor oil and 50 parts of water according to weight parts, then add them to the basic sealing liquid and stir them evenly. During production, stir 10 parts of tea polyphenols and 20 parts of water evenly and add them to the sealing liquid, then roll them on the back of the leather, and dry them in a through-type oven to obtain the finished genuine leather.

[0065] Example 2

[0066] This embodiment provides a leather processing method, which differs from Embodiment 1 only in that:

[0067] (2) Retanning is replaced by:

[0068] 1) preparing a basic retanning solution: based on the weight of the leather embryo, weighing 150% of water, 2% of chrome tanning agent, 3% of wattle bark tannin, 1% of sulfited oil and 1% of sodium acetate; 2) mixing 5 parts of tea polyphenols, 10 parts of nano manganese oxide, 1 part of nano zinc oxide, 30 parts of ethyl acetate, 10 parts of ethylene urea, 30 parts of polyethylene imine, 10 parts of cysteine, 5 parts of sulfated castor oil and 80 parts of water in parts by weight, and then adding them into the basic retanning solution in a mass ratio of 1:6, immersing the blue leather obtained in (1) in the retanning solution for retanning at a temperature of 20°C for 4 hours.

[0069] (4) Roller rubber is replaced by:

[0070] 1) Prepare basic sealing liquid: mix 75 parts of acrylic acid and 106 parts of water; 2) stir 10 parts of nano manganese oxide, 1 part of nano zinc oxide, 30 parts of ethyl acetate, 10 parts of ethylene urea, 30 parts of polyethylene imine, 10 parts of cysteine, 5 parts of sulfated castor oil and 50 parts of water according to weight parts, then add them to the basic sealing liquid and stir them evenly. During production, stir 5 parts of tea polyphenols and 30 parts of water evenly and add them to the sealing liquid, then roll them on the back of the leather, and dry them in a through-type oven to obtain finished genuine leather.

[0071] The other steps and conditions remained unchanged.

[0072] Example 3

[0073] This embodiment provides a leather processing method, which differs from Embodiment 1 only in that:

[0074] (2) Retanning is replaced by:

[0075] 1) preparing a basic retanning solution: based on the weight of the leather embryo, weighing 150% of water, 2% of chrome tanning agent, 3% of wattle bark tannin, 1% of sulfited oil and 1% of sodium acetate; 2) mixing 15 parts of tea polyphenols, 1 part of nano manganese oxide, 10 parts of nano zinc oxide, 10 parts of ethyl acetate, 30 parts of ethylene urea, 10 parts of polyethylene imine, 30 parts of cysteine, 1 part of sulfated castor oil and 90 parts of water in parts by weight, and then adding them into the basic retanning solution in a mass ratio of 1:4, immersing the blue leather obtained in (1) in the retanning solution for retanning at a temperature of 40°C for 2 hours.

[0076] (4) Roller rubber is replaced by:

[0077] 1) Prepare basic sealing liquid: mix 245 parts of acrylic acid and 344 parts of water; 2) Mix 1 part of nano manganese oxide, 10 parts of nano zinc oxide, 10 parts of ethyl acetate, 30 parts of ethylene urea, 10 parts of polyethylene imine, 30 parts of cysteine, 1 part of sulfated castor oil and 70 parts of water according to weight parts, then add them to the basic sealing liquid and stir them evenly. During production, mix 15 parts of tea polyphenols and 20 parts of water evenly and add them to the sealing liquid, then roll them on the back of the leather, and dry them in a pass-through oven to obtain a finished genuine leather.

[0078] The other steps and conditions remained unchanged.

[0079] Example 4

[0080] This embodiment provides a leather processing method, which differs from Embodiment 1 only in that:

[0081] (2) Retanning is replaced by: based on the weight of the leather embryo, weigh 150% water, 2% chrome tanning agent, 3% wattle bark tannin, 1% sulfited oil and 1% sodium acetate, and immerse the blue leather obtained in (1) in the basic retanning solution for retanning at 30°C for 3 hours.

[0082] The other steps and conditions remained unchanged.

[0083] Example 5

[0084] This embodiment provides a leather processing method, which differs from Embodiment 1 only in that:

[0085] (4) Roller glue was replaced by: 144 parts of acrylic acid and 201 parts of water were mixed evenly, and the mixture was rolled on the back of the leather, and dried in a through-type oven to obtain a finished genuine leather.

[0086] The other steps and conditions remained unchanged.

[0087] Example 6

[0088] This embodiment provides a leather processing method, which differs from Embodiment 1 only in that:

[0089] (4) Roller glue is replaced by: 1) prepare basic sealing liquid: mix 144 parts of acrylic acid and 201 parts of water; 2) mix 10 parts of tea polyphenols, 5 parts of nano manganese oxide, 5 parts of nano zinc oxide, 20 parts of ethyl acetate, 20 parts of ethylene urea, 20 parts of polyethyleneimine, 20 parts of cysteine, 3 parts of sulfated castor oil and 70 parts of water according to weight parts, then add to the basic sealing liquid, roll coat on the back of the leather, and dry in a through-type oven to obtain a finished genuine leather.

[0090] The other steps and conditions remained unchanged.

[0091] Comparative Example 1

[0092] This comparative example provides a leather processing method, which differs from Example 1 only in that:

[0093] In step (2) and step (4), tea polyphenols are not added, and their weight proportions are distributed to nano zinc oxide, ethyl acetate, and sulfated castor oil according to the proportions in Example 1, while other conditions remain unchanged.

[0094] Comparative Example 2

[0095] This comparative example provides a leather processing method, which differs from Example 1 only in that:

[0096] In step (2) and step (4), nano zinc oxide is not added, and its weight proportions are distributed to tea polyphenols, ethyl acetate, and sulfated castor oil according to the proportions in Example 1, and other conditions remain unchanged.

[0097] Comparative Example 3

[0098] This comparative example provides a leather processing method, which differs from Example 1 only in that:

[0099] In step (2) and step (4), ethyl acetate is not added, and its weight proportions are distributed to tea polyphenols, nano zinc oxide, and sulfated castor oil according to the proportions in Example 1, and other conditions remain unchanged.

[0100] Comparative Example 4

[0101] This comparative example provides a leather processing method, which differs from Example 1 only in that:

[0102] In step (2) and step (4), sulfated castor oil is not added, and its weight proportions are distributed to tea polyphenols, nano zinc oxide, and ethyl acetate according to the proportions in Example 1, and other conditions remain unchanged.

[0103] Comparative Example 5

[0104] This comparative example provides a leather processing method, which differs from Example 1 only in that:

[0105] In step (2) and step (4), ethylene urea is not added, and its weight proportion is distributed to polyethyleneimine, cysteine, and nano manganese oxide according to the proportion in Example 1, and other conditions remain unchanged.

[0106] Comparative Example 6

[0107] This comparative example provides a leather processing method, which differs from Example 1 only in that:

[0108] In step (2) and step (4), polyethyleneimine is not added, and its weight proportion is distributed to ethylene urea, cysteine, and nano manganese oxide according to the proportion in Example 1, and other conditions remain unchanged.

[0109] Comparative Example 7

[0110] This comparative example provides a leather processing method, which differs from Example 1 only in that:

[0111] In step (2) and step (4), cysteine ​​was not added, and its weight proportions were distributed to ethylene urea, polyethylene imine, and nano manganese oxide according to the proportions in Example 1, and other conditions remained unchanged.

[0112] Comparative Example 8

[0113] This comparative example provides a leather processing method, which differs from Example 1 only in that:

[0114] In step (2) and step (4), nano manganese oxide is not added, and its weight proportions are distributed to ethylene urea, polyethylene imine, and cysteine ​​according to the proportions in Example 1, and other conditions remain unchanged.

[0115] Comparative Example 9

[0116] This comparative example provides a leather processing method, which differs from Example 1 only in that:

[0117] In step (2) and step (4), tea polyphenols, nano zinc oxide, ethyl acetate and sulfated castor oil are not added, and their total weight portions are distributed to ethylene urea, polyethylene imine, cysteine ​​and nano manganese oxide according to the proportions in Example 1, and other conditions remain unchanged.

[0118] Comparative Example 10

[0119] This comparative example provides a leather processing method, which differs from Example 1 only in that:

[0120] In step (2) and step (4), ethylene urea, polyethylene imine, cysteine ​​and nano manganese oxide are not added, and their total weight portions are distributed to tea polyphenols, nano zinc oxide, ethyl acetate and sulfated castor oil according to the proportions in Example 1, and other conditions remain unchanged.

[0121] Comparative Example 11

[0122] This comparative example provides a leather processing method, which differs from Example 1 only in that:

[0123] (2) Retanning is replaced by: based on the weight of the leather embryo, weigh 150% water, 2% chrome tanning agent, 3% wattle bark tannin, 1% sulfited oil and 1% sodium acetate, and immerse the blue leather obtained in (1) in the basic retanning solution for retanning at 30°C for 3 hours.

[0124] (4) Roller glue was replaced by: 144 parts of acrylic acid and 201 parts of water were mixed evenly, and the mixture was rolled on the back of the leather, and dried in a through-type oven to obtain a finished genuine leather.

[0125] Comparative Example 12

[0126] This comparative example provides a leather processing method, which differs from Example 1 only in that:

[0127] (2) Retanning is replaced by: based on the weight of the leather embryo, weigh 150% water, 2% chrome tanning agent, 3% wattle bark tannin, 1% sulfited oil and 1% sodium acetate, and immerse the blue leather obtained in (1) in the basic retanning solution for retanning at 30°C for 3 hours.

[0128] (4) Roller glue was replaced by: 144 parts of acrylic acid and 201 parts of water were mixed evenly, and the mixture was applied to the back of the leather by roller, and dried in a pass-through oven.

[0129] (5) After the rolling process, the leather is hung in a drying oven at 65°C for 12 hours to obtain the finished genuine leather.

[0130] Comparative Example 13

[0131] This comparative example provides a leather processing method, which differs from Example 1 only in that:

[0132] (2) Retanning is replaced by: based on the weight of the leather embryo, weigh 150% water, 2% chrome tanning agent, 3% wattle bark tannin, 1% sulfited oil and 1% sodium acetate, and immerse the blue leather obtained in (1) in the basic retanning solution for retanning at 30°C for 3 hours.

[0133] (4) Roller glue was replaced by: 144 parts of acrylic acid and 201 parts of water were mixed evenly, and the mixture was applied to the back of the leather by roller, and dried in a pass-through oven.

[0134] (5) After the roller glue is finished, the commonly used amino formaldehyde adsorbent on the market (purchased from Chongqing Shunhe Metallurgical Furnace Technology Co., Ltd., Aldehyde remove S model product) is added at a rate of 100g / m 2 Evenly spray on the back of the leather to get the finished genuine leather.

[0135] Test Example 1

[0136] This test example tests the leather obtained from Examples 1-6 and Comparative Examples 1-13 for odor and aldehyde substances:

[0137] 1) Odor test method: parallel testing was carried out according to the 3L odor bottle method of the automotive industry, with specific reference to Q / SQR T1-8.4-2017, test conditions were 65±2℃, storage time was 2h, grade requirements were shown in Table 1, and specific test results were shown in Table 2;

[0138] 2) Aldehyde substance evaluation method: parallel testing is carried out according to the 2000L bag method of the automotive industry, specifically referring to the method of Q / BYDQ-A1901.771-2017, and the unit of measurement result is μg / m 3 The specific test results are shown in Table 2.

[0139] Table 1

[0140]

[0141]

[0142] Table 2

[0143]

[0144]

[0145] According to the data in Table 2, the formaldehyde and deodorizing composition provided by the present invention can significantly improve the odor of leather, thereby improving the odor level of leather, and can effectively remove residual formaldehyde, acetaldehyde and acrolein in the leather.

[0146] By comparing Example 1 with Examples 4-5, it can be seen that when the formaldehyde-removing and deodorizing composition provided by the present invention is added separately to the retanning liquid and the sealing liquid, a certain formaldehyde-removing and deodorizing effect can also be achieved. When the formaldehyde-removing and deodorizing composition provided by the present invention is added to both the retanning liquid and the sealing liquid, the formaldehyde-removing and deodorizing effect is further improved.

[0147] Comparing Example 1 with Example 6, it can be seen that adding tea polyphenols when the sealing liquid is used can enhance the deodorizing effect of the composition.

[0148] Comparing Example 1 with Comparative Examples 1-4, it can be seen that tea polyphenols, nano zinc oxide, ethyl acetate and sulfated castor oil achieve a synergistic effect in removing formaldehyde and odor, especially in removing odor.

[0149] Comparing Example 1 with Comparative Examples 5-8, it can be seen that ethylene urea, polyethylene imine, cysteine ​​and nano manganese oxide achieve a synergistic effect in removing formaldehyde and odor, especially in removing formaldehyde.

[0150] Comparing Example 1 with Comparative Examples 9-10, it can be seen that the two groups of compositions of tea polyphenols, nano zinc oxide, ethyl acetate and sulfated castor oil and ethylene urea, polyethyleneimine, cysteine ​​and nano manganese oxide also achieve synergistic effects in removing formaldehyde and odor.

[0151] By comparing Example 1 with Comparative Examples 11-13, it can be seen that the method for removing formaldehyde and odor from leather provided by the present invention has significantly improved effects compared with traditional methods.

[0152] The applicant declares that the present invention illustrates the technical solution of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned embodiments, that is, it does not mean that the present invention must rely on the above-mentioned embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

[0153] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0154] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims

1. A composition for removing formaldehyde and deodorizing leather processing, characterized in that: The composition for removing formaldehyde and deodorizing comprises tea polyphenols, nano manganese oxide, nano zinc oxide, ethyl acetate, ethylene urea, polyethylene imine, cysteine, sulfated castor oil and water.

2. The composition for removing formaldehyde and deodorizing leather processing according to claim 1, characterized in that: The composition for removing formaldehyde and odor comprises, by weight, 5-15 parts of tea polyphenols, 1-10 parts of nano manganese oxide, 1-10 parts of nano zinc oxide, 10-30 parts of ethyl acetate, 10-30 parts of ethylene urea, 10-30 parts of polyethylene imine, 10-30 parts of cysteine, 1-5 parts of sulfated castor oil and 50-90 parts of water.

3. Use of the composition for removing formaldehyde and deodorizing leather processing according to claim 1 or 2 in leather manufacturing; Preferably, the composition for removing formaldehyde and deodorizing is added to the retanning liquid and / or the sealing liquid during the leather processing.

4. A leather processing method, characterized in that: The retanning process and / or backside rolling process in the leather processing comprises the following steps: Retanning process: adding the composition for removing aldehyde and odor according to claim 1 or 2 into the retanning liquid, placing the leather in the retanning liquid for retanning; Rolling process: adding the formaldehyde-removing and deodorizing composition of claim 1 or 2 to the sealing liquid, rolling the sealing liquid on the back of the leather, and drying.

5. The leather processing method according to claim 4, characterized in that: During the retanning process, the mass ratio of the composition for removing aldehydes and odors to the retanning liquid is 1:(4-6).

6. The leather processing method according to claim 4 or 5, characterized in that: In the retanning process, the retanning temperature is 15-40° C. and the retanning time is 1-4 hours.

7. The leather processing method according to any one of claims 4 to 6, characterized in that: The retanning solution comprises chrome tanning agent, wattle bark tannin, sulfited oil, sodium acetate and water.

8. The leather processing method according to any one of claims 4 to 7, characterized in that: During the rolling process, the mass ratio of the formaldehyde-removing and deodorizing composition to the sealing liquid is 1:(1-3).

9. A leather processing method according to any one of claims 4 to 8, characterized in that In the rolling glue process, nano manganese oxide, nano zinc oxide, ethyl acetate, ethylene urea, polyethylene imine, cysteine, sulfated castor oil and sealing liquid are first mixed, and tea polyphenols are added when used.

10. The leather processing method according to any one of claims 4 to 9, characterized in that: The sealing liquid includes acrylic acid and water.

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