Elastic soft synthetic leather

Abstract

The present invention relates to an elastic soft synthetic leather, comprising a base fabric layer, a wet-fabric base and a dry-fabricated surface layer, wherein the wet-fabric base is composed of polyurethane resin, organic silicon and filler, and organic silicon is attached to the fiber micropores of the filler, the micropores and gaps inside the polyurethane resin. The elastic soft synthetic leather has a soft and comfortable feel, a strong fleshy texture and good strength, and is a synthetic leather material with good quality and low price, and can be applied to the fields of decorative materials such as clothing leather and luggage leather.

Description

Technical Field

[0001] The invention relates to the technical field of synthetic leather production, in particular to elastic and soft synthetic leather and a softener. Background Art

[0002] Due to the limited natural resources of soft leather and the high price, it cannot meet the growing market demand. In order to improve the soft feel of synthetic leather, tannery factories usually use rubbing process and add silicone softener in the water tank. The finished leather is quickly dipped and rolled in the water tank, and then kneaded and dried. Because polyurethane resin is water-repellent, and the micropores and fiber gaps of wood fiber powder or pulp fiber powder are blocked by polyurethane resin, the softener cannot penetrate the internal structure of the fiber powder, and the softener cannot penetrate the micropores of the leather base. Under such process limitations, only a very small amount of softener is adsorbed into the pores formed by the shrinkage of the filler fiber in the base, and the softener concentration cannot be high. If the softener is used too high, too much silicone oil will adhere to the surface of the base, which will easily cause the dry surface layer and the base to not fit firmly.

[0003] In recent years, a soft protein synthetic leather has appeared on the market. Due to the effect of polyvinyl alcohol in the production ingredients, the bass has rich and dense pores and becomes soft to the touch. At the same time, because polyvinyl alcohol is easy to clog in the solvent recovery system, it is necessary to stop production and clear it, which consumes a lot of manpower and financial resources, and is also easy to cause safety problems such as solvent leakage pollution. At present, the manufacturing process of this soft protein synthetic leather is not suitable for mass production and difficult to promote, so the production efficiency is low, the manufacturing cost is high, and the price is expensive. At present, the soft feel of this soft protein synthetic leather depends unilaterally on the density of the bass pores. The denser the bass pores, the better its softness, but the worse its peeling strength. At the same time, the existing synthetic leather only pursues the softness of the leather, without considering the texture of the finished contract leather, so that the existing synthetic leather has a heavier plastic feel and no meaty resilience. Under the situation of increasing people's living needs, industries such as clothing, shoes and hats, luggage, sofas, etc. especially need to design a synthetic leather material with low price, soft feel, good strength, and at the same time ensure the surface texture of the synthetic leather. Summary of the invention

[0004] In view of the shortcomings of the prior art, the object of the present invention is to provide a low-cost, soft-touch, and high-strength elastic soft synthetic leather.

[0005] The present invention is completed by adopting the following technical scheme: an elastic and soft synthetic leather, including a base fabric, a wet-fabric base and a dry-fabricated veneer, wherein the wet-fabric base includes a polyurethane resin, silicone and a filler, and silicone is attached to the fiber micropores of the filler and the micropores and gaps inside the polyurethane resin.

[0006] Furthermore, the filler includes animal leather powder.

[0007] Furthermore, the filler is composed of a mixture of animal leather powder and fiber powder, and the fiber powder includes one or more of wood fiber powder, pulp fiber powder, and light calcium powder.

[0008] Furthermore, the weight ratio of the polyurethane resin to the animal leather powder is 30:5-30.

[0009] Furthermore, the weight ratio of the polyurethane resin, animal leather powder and fiber powder is 30:5-30:10-35.

[0010] Furthermore, the weight ratio of the polyurethane resin to the silicone in the wet-fabricated base is 30:0.5-3.8.

[0011] Furthermore, the organosilicon is one or two of amino silicone oil and amino polyether block silicone oil.

[0012] Furthermore, the wet-process base is prepared by coating a wet-process mixture on a base fabric, wherein the wet-process mixture includes a polyurethane resin solvent liquid, a softener, N,N-dimethylformamide and a filler, and the softener includes silicone or a silicone softener containing silicone.

[0013] Furthermore, the ion type of the softener is a cation, and the pH value of the silicone softener is less than 5.

[0014] Furthermore, the molecular weight of the amino polyether block silicone oil is 5000-30000, and the amino polyether block silicone oil is composed of a compound of two or more amino polyether block silicone oils with different molecular weights.

[0015] Furthermore, the weight ratio of the polyurethane resin solvent liquid to the silicone softener is 100:2-15.

[0016] Furthermore, the wood fiber powder or pulp fiber powder is a high-expansion fiber powder with an expansion rate of 17-25 and a mesh size of 350-700.

[0017] Furthermore, the animal leather powder is composed of one or more of cowhide leather powder, sheepskin leather powder, and pigskin leather powder, and the mesh number of the animal leather powder is 200-1000.

[0018] Beneficial effects of the present invention:

[0019] 1. The wet-fabric base contains animal leather powder, which has a certain degree of softness and fullness, and has a meaty resilience effect, making the prepared wet-fabric base softer, fuller and meaty. The use of this wet-fabric base makes the prepared synthetic leather have the elasticity of human skin, improving the grade of the finished synthetic leather.

[0020] 2. Wet-fabricated leather mixed with animal leather powder has extremely high water absorption performance. After absorbing moisture, the synthetic leather has a good drape, increased weight and improved softness. At the same time, hydrophilic silicone further promotes the water absorption capacity of animal leather powder, and the produced synthetic leather has a better drape.

[0021] 3. Animal leather powder has fluffy fiber structure, good bonding with resin, and the synthetic leather produced has good strength.

[0022] 4. The inside of the wet-fabricated base contains organic silicon. The inner wall of the pores formed by the fiber shrinkage of the animal leather powder and fiber powder in the filler, the fiber micropores of the filler, and the micropores and gaps inside the polyurethane resin are all attached with organic silicon. Organic silicon plays a role in lubrication and reduces the friction coefficient, making it soft and comfortable to touch. Organic silicon and animal leather powder are combined to produce synthetic leather that is both soft and plump. The softness, plumpness and firmness of the synthetic leather are all better than sheepskin, achieving the high-end of synthetic leather and the high added value of synthetic leather production.

[0023] 5. Because BASE relies on the softening effect of soft silicone, the bubbles do not need to be too dense, so it has good firmness, peel strength and tear strength.

[0024] 6. Soft silicone is adsorbed in the pores and gaps of the base, and is rarely carried away by water during the water washing process in the coagulation tank. At the same time, soft silicone is liquid, and the solvent recovery system is not easy to be blocked. DETAILED DESCRIPTION

[0025] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the preferred embodiments.

[0026] The present invention provides an elastic and soft synthetic leather, comprising a base fabric layer, a wet-fabric base and a dry-fabricated surface layer, wherein the wet-fabric base comprises polyurethane resin, organic silicon and filler, and the filler can be a filler containing animal leather powder. Organic silicon is attached to the inner wall of the pores formed by the fiber shrinkage of the filler, the fiber micropores of the filler, and the micropores and gaps inside the polyurethane resin. The weight ratio of the polyurethane resin to the organic silicon in the wet-fabric base is 30:0.5-3.8, and the optimal ratio is 30:1.5.

[0027] The organic silicon is preferably one of amino silicone oil and amino polyether block silicone oil or a mixture of the two. The amino polyether block silicone oil is preferably hydrophilic amino polyether block silicone oil. The hydrophilic amino polyether block silicone oil is prepared by adding a penetrant material to the amino polyether block silicone oil. The organic silicon is attached to the internal pores, micropores and gaps of the wet fabric base to lubricate and reduce the friction coefficient, making it soft and comfortable to touch.

[0028] Wet-fabricated base: Made from a wet mixture coated on a base fabric. The wet mixture is prepared from a polyurethane resin solvent liquid, a softener, N,N-dimethylformamide and a filler. Or another ratio of the wet mixture is made from a polyurethane resin solvent liquid, a softener, polyvinyl alcohol, N,N-dimethylformamide and a filler. The softener is silicone or a silicone softener containing silicone, and the polyurethane resin solvent liquid contains a polyurethane resin. The weight proportion of water in the wet mixture is less than 3.5%. If there is a lot of water in the wet mixture with dyes, the pigment will easily penetrate into the water during the water washing process in the coagulation tank after the wet mixture is coated, thereby contaminating the base fabric. Therefore, the weight proportion of water in the wet mixture is less than 3.5%, which reduces the contamination of the base fabric.

[0029] Filler: The filler includes animal leather powder or the filler is a mixture of animal leather powder and fiber powder. When the filler is animal leather powder, the weight ratio of the polyurethane resin to the animal leather powder is 30:5-30, and the best ratio is 30:10-15. The animal leather powder is composed of one or more of cowhide leather powder, sheepskin leather powder, and pigskin leather powder, and the mesh number of the animal leather powder is 200-1000, and the best mesh number is 300-350. When the filler is a mixture of animal leather powder and fiber powder, the weight ratio of the polyurethane resin, animal leather powder, and fiber powder is 30:5-30:10-35, and the best ratio is 30:10-15:25-30. The fiber powder includes one or more of wood fiber powder and pulp fiber powder. The filler also includes one or more of light calcium powder or heavy calcium powder. The fiber powder is a high expansion fiber powder, with an expansion rate of 17-25 and a mesh number of 350-700, wherein the best expansion rate is about 20 and the best mesh number is about 600. The expansion coefficient of wood fiber powder and pulp fiber powder is large, and the foam cells of the wood fiber powder and pulp fiber powder after shrinkage are relatively large, and the bass is relatively softer. At the same time, the finer the wood fiber powder or pulp fiber powder, the denser the foam cells of the wood fiber powder or pulp fiber powder after shrinkage, and the softer the bass feels.

[0030] The above-mentioned filler adopts animal leather powder or a mixture of animal leather powder and fiber powder to have the following effects:

[0031] 1. The wet-fabric base contains animal leather powder, which has a certain degree of softness and fullness, and has a meaty resilience effect, making the prepared wet-fabric base softer, fuller and meaty. The use of this wet-fabric base makes the prepared synthetic leather have the elasticity of human skin, making the feel of the synthetic leather better than that of real leather, and improving the grade of the finished synthetic leather.

[0032] 2. Wet-fabricated leather mixed with animal leather powder has extremely high water absorption performance. After absorbing moisture, the synthetic leather has a good drape, increased weight and improved softness. At the same time, hydrophilic silicone further promotes the water absorption capacity of animal leather powder, and the produced synthetic leather has a better drape.

[0033] 3. Animal leather powder has fluffy fiber structure, good bonding with resin, and the synthetic leather produced has good strength.

[0034] 4. The inside of wet-fabricated leather contains organic silicon, which acts as a lubricant to reduce the friction coefficient and feels soft and comfortable to the touch. Organic silicon is combined with animal leather powder to produce synthetic leather that is both soft and plump. The softness, plumpness and firmness of synthetic leather are all better than sheepskin, achieving high-end synthetic leather and high added value in synthetic leather production.

[0035] Ionic type of silicone softener: The ionic type of silicone softener is cationic, and the softness of cationic silicone softener is significantly higher than that of anionic silicone softener and non-ionic silicone softener. At the same time, the polysiloxane surface of cationic silicone softener has positive charge, and the fiber surface of the base fabric has negative charge, so the polysiloxane can be well adsorbed on the fiber surface and is not easy to fall off.

[0036] Raw materials of silicone softener: The silicone softener includes amino silicone oil emulsion or amino polyether block silicone oil emulsion or amino polyether block silicone oil solvent liquid or hydrophilic amino polyether block silicone oil emulsion or hydrophilic amino polyether block silicone oil. Among them, the amino silicone oil emulsion of amino silicone oil emulsion includes amino silicone oil, emulsifier and water. The amino polyether block silicone oil emulsion consists of amino polyether block silicone oil and water. The amino polyether block silicone oil solvent liquid consists of amino polyether block silicone oil and solvent, or the amino polyether block silicone oil solvent liquid consists of amino polyether block silicone oil, acetic acid and solvent, and the weight ratio of amino polyether block silicone oil and acetic acid is 60:9-18, and the optimal ratio is 60:12. The solvent is one or more of butyl ether, isopropanol, N,N-dimethylformamide and water. The solvent is one or more of butyl ether, isopropanol and N,N-dimethylformamide.

[0037] The amino polyether block silicone oil refers to a polysiloxane polyether block copolymer segmented by polysiloxane, amino group and polyether. Alternatively, the amino polyether block silicone oil refers to a polyether block copolymer obtained by mixed reaction of epoxy-terminated polyether silicone oil, polyether amine and solvent. The amino polyether block silicone has excellent heat stability and shear resistance, which not only maintains the softer and silkier feeling of amino silicone oil, but also is non-sticky and yellowing-resistant, and can also provide ideal moisture absorption and antistatic properties. The leather has a good drape after moisture absorption.

[0038] The molecular weight of the amino polyether block silicone oil is 5000-30000, and the amino polyether block silicone oil is composed of a compound of amino polyether block silicone oils of different molecular weights. Specifically, the amino polyether block silicone oil can be selected from two or three combinations of molecular weights within three ranges, wherein the three molecular weights of the amino polyether block silicone oil include: a. low molecular weight of 7000-9000; b. medium molecular weight of 10000-12000; c. high molecular weight of 13000-15000. The best weight and molecular weight ratio of the best amino polyether block silicone oil is: 70 parts of amino polyether block silicone oil with a molecular weight of 8000 and 30 parts of amino polyether block silicone oil with a molecular weight of 12000. The amino polyether block silicone oil with low molecular weight exhibits relatively good softness and fluffiness, while the amino polyether block silicone oil with high molecular weight exhibits relatively good smoothness. The soft silicone emulsion composed of a variety of amino polyether block silicone oils with different molecular weights will have a better softening effect.

[0039] The solid content of the organic silicon softener is 15-70%, the solid content of the wet polyurethane resin solvent is 28-32%, and the weight ratio of the wet polyurethane resin solvent to the organic silicon softener is 100:2-15. The best solution is to combine the wet polyurethane resin solvent with a solid content of 30% and the organic silicon softener with a solid content of 25%, and the best weight ratio of the wet polyurethane resin solvent to the organic silicon softener is 100:6.

[0040] The functions of the above silicone softener are as follows:

[0041] 1. It plays a role of uniform dispersion in the wet mixture, so that the filler is evenly dispersed. After the wet mixture is coated, it is washed and dried in the coagulation tank. The filler wood fiber powder shrinks to form a uniformly distributed pore structure. The silicone plays a role of lubrication and reduces the friction coefficient, and the foam feels strong to the touch.

[0042] Second, the silicone softener is wrapped in the polyurethane resin solvent liquid. After the wet mixture is applied, it is washed and dried in the coagulation tank, and very dense micropores containing soft silicone are formed in the resin, making the bass particularly soft. The soft silicone is absorbed between the pores and fibers of the filler, making the filler soft.

[0043] 3. The soft silicone is basically adsorbed in the bubbles and gaps of the base. During the water washing process in the coagulation tank, the soft silicone is rarely carried away by water. At the same time, because the soft silicone is liquid, the solvent recovery system is not easy to be blocked.

[0044] 4. This kind of bass relies on the softening effect of soft silicone, so the bubbles do not need to be too dense, so it has good firmness, peel strength and tear strength.

[0045] pH value of silicone softener: The pH value of silicone softener is less than 5, and the optimal pH value is 2.2. Since the filler is alkaline, the alkalinity of the wet mixture will become heavier during the water washing process in the coagulation tank after coating. If the pH value is greater than 7, the silicone softener will break. The silicone floating on the water surface will pollute the base fabric and cause oil spots. Therefore, designing the pH value of silicone softener to be less than 5 is conducive to alkali-acid neutralization. Acetic acid is added to the silicone softener to adjust the pH value of the softener to ensure that the pH value of the silicone softener is acidic.

[0046] Polyurethane resin solvent liquid: The polyurethane resin solvent liquid has a solid content of 28-32%, wherein the optimal solid content is 30%. The polyurethane resin solvent liquid is a mixture of wet polyurethane resin and solvent, or the polyurethane resin solvent liquid is a wet soft polyurethane resin solvent liquid, and the modulus of the wet soft polyurethane resin is 5-10kgf / cm2.

[0047] Dry veneer: The dry veneer in the above-mentioned elastic and soft synthetic leather is made of a dry mixed liquid coated on the release paper. The dry mixed liquid includes a dry polyurethane resin, N, N-dimethylformamide, and color powder. The dry veneer is divided into an inner layer and an outer layer. The inner layer is attached to the wet base, wherein the hardness of the dry polyurethane resin in the inner layer is smaller than that of the dry polyurethane resin in the outer layer. The modulus of the dry polyurethane resin in the inner layer is less than 30kgf / c㎡, and the optimal modulus is 10kgf / c㎡. The modulus of the dry polyurethane resin in the outer layer is greater than 45kgf / c㎡, and the optimal modulus is 80kgf / c㎡. The outer layer of the dry veneer layer is composed of dry silicone polyurethane, or a mixture of dry silicone polyurethane and dry polyurethane resin. The resin has the characteristics of soft and smooth hand feel, strong skin feel and deep color, and is suitable for peeling off release paper with strong fog. Due to the high price of resin, dry silicone resin and dry polyurethane resin are combined to give the dry veneer layer the advantages of resin while reducing costs. A mixture of dry silicone polyurethane and dry polyurethane resin to form a dry veneer layer is the best solution.

[0048] The steps of the manufacturing process of the elastic soft synthetic leather are as follows:

[0049] 1. Preparation of mixed liquid, including preparation of wet mixed liquid and dry mixed liquid.

[0050] 1) Preparation of wet mixed liquid: First, mix and stir the soft silicone emulsion, N,N-dimethylformamide, filler, color paste and other raw materials evenly, then add the polyurethane resin solvent liquid, mix and stir evenly, and degas.

[0051] 2) The steps for preparing the dry mixed solution are as follows:

[0052] A. Preparation of dry outer layer mixture: high modulus dry polyurethane resin, N, N-dimethylformamide, butanone, polyether modified silicone and color powder are mixed and stirred evenly, and degassed;

[0053] b. Preparation of dry inner layer mixed liquid: low modulus dry polyurethane resin, N, N-dimethylformamide, butanone, polyether modified silicone and color powder are mixed and stirred evenly, and defoamed.

[0054] 2. Preparation of wet bass:

[0055] 1) Pretreatment of base fabric: immerse the base fabric in an aqueous solution of N,N-dimethylformamide with a concentration of 15-25%, press out the excess aqueous solution with a squeeze roller, and iron it with an ironing wheel, with a humidity of 40%.

[0056] 2) Coating and solidification: The wet mixed liquid is evenly coated on the pretreated base fabric, and then immersed in a solidification tank with a 20% N, N-dimethylformamide aqueous solution for solidification.

[0057] 3) Washing and drying: After complete solidification, it passes through the squeezing rollers to squeeze out the excess coagulation liquid, and then is washed with clean water in a washing tank. The first section of the washing tank is washed with five groups of squeezing rollers, and the second section is washed with six groups of squeezing rollers. Finally, it is dried, expanded, and shaped to obtain the wet-fabricated bass.

[0058] 3. Dry veneer, including the following steps:

[0059] 1) Preparation of release paper coating: zero-gap coating of 2) a dry mixed solution is carried out on the release paper film, and the mixture is dried in an oven until it is semi-dry. Then, 2) b dry mixed solution is coated on the film, and the mixture is dried in an oven until it is semi-dry to obtain a release paper coating.

[0060] 2) Dry veneer: directly laminate the wet-fabric leather onto the release paper coating prepared in step 3) by pressure, then dry it in an oven, cool it with a cooling roller, and then roll up the release paper and the laminated wet-fabric leather separately to obtain the finished leather.

[0061] 4. Finished leather surface coating: The front of the finished leather is coated with a coating agent using three-plate printing, and then dried in an oven to obtain finished leather with a coated effect.

[0062] 5. Finished leather rubbing treatment includes the following steps:

[0063] 1) Add the softener into the water tank and mix well;

[0064] 2) The finished leather is immersed in the aqueous solution in the water tank, then dehydrated and squeezed, and then passed through the rubbing machine to rub and dry;

[0065] 3) After the final inspection, winding and packaging, you will get a synthetic leather material that is soft to the touch, has a strong texture, is strong, and is inexpensive and good value for money.

[0066] The following is a specific example of the wet mixed material ratio of the elastic soft synthetic leather:

[0067] Embodiment 1: The wet mixed material of the soft synthetic leather is composed of the following components in parts by weight:

[0068] 700 parts of wet polyurethane resin solvent liquid with modulus 5kgf / c㎡,

[0069] 300 parts of wet polyurethane resin solvent liquid with modulus 10kgf / c㎡,

[0070] 1300 parts of N,N-dimethylformamide,

[0071] 80 parts of hydrophilic amino polyether block silicone oil emulsion,

[0072] 250 parts of cowhide leather powder.

[0073] Example 2: The wet mixed material of the soft synthetic leather is composed of the following components in parts by weight:

[0074] 700 parts of wet polyurethane resin solvent liquid with modulus 5kgf / c㎡,

[0075] 300 parts of wet polyurethane resin solvent liquid with modulus 10kgf / c㎡,

[0076] 1300 parts of N,N-dimethylformamide,

[0077] 80 parts of hydrophilic amino polyether block silicone oil emulsion,

[0078] 250 parts of wood fiber powder,

[0079] 50 parts of cowhide leather powder.

[0080] Embodiment 3: Another ratio of the wet mixture of the soft synthetic leather is composed of the following components in parts by weight:

[0081] 700 parts of wet polyurethane resin solvent liquid with modulus 5kgf / c㎡,

[0082] 300 parts of wet polyurethane resin solvent liquid with modulus 10kgf / c㎡,

[0083] 1200 parts of N,N-dimethylformamide,

[0084] 80 parts of amino polyether block silicone oil emulsion,

[0085] 250 parts of wood fiber powder,

[0086] 45 parts of sheepskin leather powder.

[0087] Embodiment 4: Another ratio of the wet mixture of the soft synthetic leather is composed of the following components in parts by weight:

[0088] 700 parts of wet polyurethane resin solvent liquid with modulus 5kgf / c㎡,

[0089] 300 parts of wet polyurethane resin solvent liquid with modulus 10kgf / c㎡,

[0090] 1200 parts of N,N-dimethylformamide,

[0091] 80 parts of amino silicone oil emulsion,

[0092] 250 parts of pulp fiber powder,

[0093] 100 servings of heavy calcium powder

[0094] 45 parts of pig leather powder.

[0095] Example 5: Another ratio of the wet mixture of the soft synthetic leather is composed of the following components in parts by weight:

[0096] 700 parts of wet polyurethane resin solvent liquid with modulus 5kgf / c㎡,

[0097] 300 parts of wet polyurethane resin solvent liquid with modulus 10kgf / c㎡,

[0098] 1200 parts of N,N-dimethylformamide,

[0099] 250 parts of wood fiber powder,

[0100] 45 parts of sheepskin powder

[0101] 80 parts of soft silicone emulsion.

[0102] Example 6: Another ratio of the wet mixture of the soft synthetic leather is composed of the following components in parts by weight:

[0103] 700 parts of wet polyurethane resin solvent liquid with modulus 5kgf / c㎡,

[0104] 300 parts of wet polyurethane resin solvent liquid with modulus 10kgf / c㎡,

[0105] 1200 parts of N,N-dimethylformamide,

[0106] 250 parts of wood fiber powder,

[0107] Animal leather powder mixture 48 parts

[0108] 80 parts of soft silicone emulsion.

[0109] Embodiment 7: The wet mixed material of the elastic and soft synthetic leather is composed of the following components in parts by weight:

[0110] 700 parts of wet polyurethane resin solvent liquid with modulus 5kgf / c㎡,

[0111] 300 parts of wet polyurethane resin solvent liquid with modulus 10kgf / c㎡,

[0112] 80 parts of soft silicone emulsion,

[0113] 1200 parts of N,N-dimethylformamide,

[0114] 300 parts of wood fiber powder.

[0115] Soft silicone has not been introduced into the mixed slurry of wet-process base of traditional synthetic leather. In the preparation of the mixed slurry of wet-process base, polyether silicone oil leveling agent is used to reduce tension, dimethyl silicone oil defoaming agent is used for defoaming, and diorganopolysiloxane flexibilizer is used to improve the flexibility of the resin after curing, and the usage amount is very small. The silicone softener used in the post-finishing process generally has an organic silicone content of 8%, and then added to the water rubbing water tank at a usage of 3%, and then calculated at a liquid carrying rate of 30%, it can be known that the proportion of attached silicone in the base is 0.72‰; in this embodiment, the proportion of attached silicone in the base is about 4%, which is obviously much higher than the proportion of silicone in the base in the post-finishing process. Therefore, the softening effect of silicone softener in wet mixed material far exceeds the effect of silicone softener in the post-finishing process.

[0116] Embodiment 8: Another ratio of the wet mixture of the elastic and soft synthetic leather is composed of the following components in parts by weight:

[0117] 700 parts of wet polyurethane resin solvent liquid with modulus 5kgf / c㎡,

[0118] 300 parts of wet polyurethane resin solvent liquid with modulus 10kgf / c㎡,

[0119] 80 parts of soft silicone emulsion,

[0120] 1200 parts of N,N-dimethylformamide,

[0121] 300 parts of wood fiber powder,

[0122] 125 parts of light calcium powder.

[0123] Embodiment 9: The wet mixed material in the elastic soft synthetic leather is composed of the following components in parts by weight:

[0124] 700 parts of wet polyurethane resin solvent liquid with modulus 5kgf / c㎡,

[0125] 300 parts of wet polyurethane resin solvent liquid with modulus 10kgf / c㎡,

[0126] Soft silicone emulsion 60 parts,

[0127] Polyvinyl alcohol powder 100 parts

[0128] 1200 parts of N,N-dimethylformamide,

[0129] 250 parts of wood fiber powder.

[0130] In this ratio, polyvinyl alcohol can provide dense micropores, and the inner wall of the micropores absorbs silicone softener, so the produced bass is particularly soft. Compared with the current mixture of soft protein synthetic leather bass, this greatly reduces the amount of polyvinyl alcohol used, which makes the blockage period of polyvinyl alcohol in the solvent recovery system much longer.

[0131] The following provides specific examples of two ratios of the silicone softener in the wet mixture of the elastic and soft synthetic leather:

[0132] Embodiment 10: The organic silicon softener in the wet mixture of the elastic and soft synthetic leather is composed of the following components in parts by weight:

[0133] 60 parts of amino polyether block silicone oil;

[0134] 9-18 parts of acetic acid, with 12 parts being the best;

[0135] Ethylene glycol monobutyl ether, isopropyl alcohol 35-50 parts, the best is 40 parts;

[0136] Water, N,N-dimethylformamide 35-185 parts, the best is 150 parts.

[0137] Amino polyether block silicone has excellent heat stability and shear resistance. It not only maintains the softer and silkier feel of amino silicone oil, but is also non-sticky and resistant to yellowing. It also provides ideal moisture absorption and antistatic properties. The leather has a good drape after moisture absorption.

[0138] Example 11: Another proportion of the weight of the silicone softener in the wet mixture of the elastic and soft synthetic leather is as follows:

[0139] 60 parts of amino polyether block silicone oil;

[0140] 9-18 parts of acetic acid, preferably 12 parts;

[0141] Ethylene glycol monobutyl ether, isopropyl alcohol 35-50 parts, preferably 40 parts;

[0142] N,N-dimethylformamide 35-185 parts, optimally 150 parts.

[0143] Among them, butyl ether, isopropanol and N,N-dimethylformamide are solvents. The pigment paste in the wet mixed slurry has poor compatibility with water. Too much water in the wet mixed slurry will affect the peeling strength. Therefore, after the water in the ratio is replaced by N,N-dimethylformamide, the pigment is not easy to run into the water during the water washing process in the coagulation tank of the wet mixed slurry, and the base fabric is not easy to be contaminated by color. Secondly, the peeling strength is improved, the softness is better, and the fourth is conducive to the dispersion of the mixed slurry.

[0144] Embodiment 12: The steps of the manufacturing process of the softener are as follows:

[0145] 1) Preparation of amino polyether block silicone oil with 60% silicone content,

[0146] The first step is addition reaction, the reaction temperature is about 70 degrees, and the temperature is kept for about 5 hours. It is prepared from the following raw materials by weight:

[0147] 8000 molecular weight end-epoxy polyether silicone oil 800 kg,

[0148] Polyether 96 kg,

[0149] Chloroplatinic acid 12 g,

[0150] 370 kg of isopropyl alcohol.

[0151] The second step is amination reaction, the reaction temperature is about 80 degrees, and the temperature is kept for about 8 hours. It is prepared from the following raw materials by weight:

[0152] In the first step, 1266 kg of amino polyether block silicone oil with 60% silicone content was obtained.

[0153] Polyetheramine 20 kg,

[0154] 240 kg of ethylene glycol monobutyl ether.

[0155] 2) Preparation of amino polyether block silicone oil emulsion with 25% silicone content. The Bess softener can be obtained by emulsification in a stirred tank with a scraper and high shear machine. The emulsified materials are as follows:

[0156] 1526 kg of amino polyether block silicone oil with 60% silicone content,

[0157] Acetic acid 180 kg,

[0158] 1956 kg of water.

[0159] Example 13: It is basically the same as Example 12, except that: an amino polyether block silicone oil emulsion with a silicone content of 25% is prepared. The Bess softener can be obtained by emulsification in a stirred kettle with a scraper and a high shear machine. The emulsified materials are as follows:

[0160] 1526 kg of amino polyether block silicone oil with 60% silicone content,

[0161] Acetic acid 180 kg,

[0162] 956 kg of water,

[0163] 1000 kg of N,N-dimethylformamide.

[0164] Example 14: The same as Example 11, except that: the amino polyether block silicone oil solution with 25% silicone content is prepared. The Bess softener can be obtained by mixing, stirring and dispersing in a stirring kettle with a scraper and a high shear machine. The mixed components are as follows:

[0165] 1526 kg of amino polyether block silicone oil with 60% silicone content,

[0166] Acetic acid 180 kg,

[0167] 1956 kg of N,N-dimethylformamide.

[0168] Further, an amino polyether block silicone oil solution with a 25% silicone content was prepared.

[0169] The Bess softener can be obtained by mixing, stirring and dispersing in a stirring kettle with a scraper and high shear machine. The mixed components are as follows:

[0170] 1526 kg of amino polyether block silicone oil with 60% silicone content,

[0171] Acetic acid 180 kg,

[0172] Polyvinyl alcohol 156 kg,

[0173] 1800 kg of water.

[0174] Embodiment 15: Another ratio of the dry mixture of the elastic soft synthetic leather is provided, wherein the dry mixture comprises a dry outer layer mixture and a dry inner layer mixture, and is composed of the following components in parts by weight:

[0175] The dry outer layer mixture is prepared from the following raw materials in percentage by weight:

[0176] 40 parts of dry polyurethane resin with modulus 80kgf / cm2,

[0177] 30 parts of N,N-dimethylformamide,

[0178] 21.8 parts of butanone,

[0179] 0.2 parts of leveling agent,

[0180] 8 parts of color powder.

[0181] The dry inner layer mixed liquid is prepared from the following raw materials in percentage by weight:

[0182] 30 parts of dry polyurethane resin with modulus 10kgf / c㎡,

[0183] Modulus 15kgf / c㎡ dry polyurethane resin 10 parts,

[0184] 30 parts of N,N-dimethylformamide,

[0185] 21.5 parts of butanone,

[0186] 0.2 parts of leveling agent,

[0187] Emulsifier AEO-3 is 0.3 parts,

[0188] 8 parts of color powder.

[0189] Embodiment 16: A wet-process polyurethane resin solvent liquid is prepared by mixing a softener in a wet-process base and a wet-process polyurethane resin solvent liquid. The wet-process polyurethane resin solvent liquid with a softener comprises a nonionic wet-process polyurethane resin, an amino polyether block silicone oil, acetic acid, and a solvent. The solvent is selected from the group consisting of butyl ether, isopropyl alcohol, and N,N-dimethylformamide.

[0190] The preparation process of the wet polyurethane resin solvent liquid with a 30% solid content and a softener is to mix, stir and disperse by a stirring kettle with a wall scraper and a high-speed disperser. The mixed components are as follows:

[0191] 1000 kg of 30% solid content non-ionic wet polyurethane resin solvent liquid,

[0192] 100 kg of amino polyether block silicone oil with 60% silicone content,

[0193] 10 kg of acetic acid,

[0194] 90 kg of N,N-dimethylformamide.

[0195] Since the siloxane in the amino polyether block silicone oil is connected with a large amount of polyether, the mixture of non-ionic wet polyurethane resin solvent liquid, N,N-dimethylformamide and cationic amino polyether block silicone oil is stable and can be stored for a long time.

[0196] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An elastic and soft synthetic leather, comprising a base fabric, a wet-process base and a dry-process veneer, Features: The wet-fabric base includes polyurethane resin, organic silicon and filler, and organic silicon is attached to the fiber micropores of the filler and the micropores and gaps inside the polyurethane resin; The organosilicon is one or two of amino silicone oil and amino polyether block silicone oil; The filler includes animal leather powder or wood fiber powder.

2. The elastic soft synthetic leather as claimed in claim 1, It is characterized in that The filler is composed of a mixture of animal leather powder and fiber powder.

3. The elastic soft synthetic leather as claimed in claim 2, It is characterized in that The fiber powder includes one or more components of wood fiber powder and pulp fiber powder.

4. The elastic soft synthetic leather as claimed in claim 2, It is characterized in that The weight ratio of the polyurethane resin to the animal leather powder is 30:5-30.

5. The elastic soft synthetic leather as claimed in claim 3, It is characterized in that The weight ratio of the polyurethane resin, animal leather powder and fiber powder is 30:5-30:10-35.

6. An elastic soft synthetic leather as claimed in any one of claims 1 to 5, It is characterized in that The weight ratio of the polyurethane resin to the silicone in the wet-fabric base is 30:0.5-3.

8.

7. An elastic soft synthetic leather as claimed in claim 1 or 2 or 3 or 4 or 5, It is characterized in that The wet-process base is prepared from a wet-process mixture coated on a base fabric, wherein the wet-process mixture includes a polyurethane resin solvent liquid, a softener, N,N-dimethylformamide and a filler, and the softener includes silicone or a silicone softener containing silicone.

8. The elastic soft synthetic leather as claimed in claim 7, It is characterized in that The ion type of the softener is a cation, and the pH value of the silicone softener is less than 5.

9. The elastic soft synthetic leather as claimed in claim 8, It is characterized in that The weight ratio of the polyurethane resin solvent liquid to the silicone softener is 100:2-15.

10. The elastic soft synthetic leather as claimed in claim 7, It is characterized in that The molecular weight of the amino polyether block silicone oil is 5000-30000, and the amino polyether block silicone oil is composed of two or more amino polyether block silicone oils with different molecular weights.

11. The elastic soft synthetic leather as claimed in claim 9, It is characterized in that The molecular weight of the amino polyether block silicone oil is 5000-30000, and the amino polyether block silicone oil is composed of two or more amino polyether block silicone oils with different molecular weights.

12. The elastic soft synthetic leather according to claim 10 or 11, It is characterized in that The wood fiber powder or pulp fiber powder is a high-expansion fiber powder with an expansion rate of 17-25 and a mesh number of 350-700.

13. The elastic soft synthetic leather according to claim 2 or 3 or 4 or 5 or 11, It is characterized in that The animal leather powder is composed of one or more of cowhide leather powder, sheepskin leather powder and pigskin leather powder, and the mesh number of the animal leather powder is 200-1000.