Cattle two-layer PU (polyurethane) dry-process leather feeling agent and preparation method thereof

Abstract

The invention relates to a hand feeling agent for leather production, provides a cow split PU dry-process leather hand feeling agent and a preparation method thereof, and solves the defects of non-uniform dispersion of raw material components and general hand feeling performance of a hand feeling agent for leather in the prior art. Comprising the following raw materials in parts by weight: 70 to 80 parts of tween-60, 5 to 10 parts of polyoxyethylene sorbitol monostearate, 30 to 50 parts of sucrose stearate, 20 to 40 parts of octadecanoic acid, 40 to 200 parts of polyol, 2 to 15 parts of a flatting agent, 50 to 60 parts of polyether modified polysiloxane, 20 to 30 parts of amino silicon oil, 10 to 20 parts of a silane coupling agent, 5 to 10 parts of silicon dioxide matting powder and 30 to 50 parts of aziridine. 5 to 8 parts of organic siloxane defoaming agent, 100 to 500 parts of deionized water and 5 to 15 parts of antibacterial finishing liquid.

Description

Technical Field

[0001] The invention relates to a feel agent for leather production, in particular to a cow split PU dry-process leather feel agent and a preparation method thereof. Background Art

[0002] Hand feeling agent is an important auxiliary agent for preparing high-grade leather. It is used in leather finishing to increase the silky, oily, cottony and other hand feelings of the leather surface. Commonly used hand feeling agents in the prior art include waxy hand feeling agents, which are not easy to emulsify, have a general emulsion state, and have fewer hand feeling types.

[0003] Chinese patent application No. 201610405235.8 discloses a formula of leather cotton wax hand wax and its production process, wherein the weight percentage of each component in the formula of leather cotton wax hand wax is: wax emulsion 2.5%-10.2%, oleic acid 0.7%-2.8%, diethanolamine 0.7%-2.8%, silicone 10%-40%, and the remaining component is water. The leather obtained by adopting this formula has a certain cotton and waxy feel, but there is a defect that the wax emulsion is not easy to be dispersed evenly, and the feel is relatively general. Summary of the invention

[0004] Therefore, in view of the above problems, the present invention provides a cow split PU dry leather feel agent and a preparation method thereof, which solves the defects of the prior art that the raw material components of the leather feel agent are unevenly dispersed and the feel performance is relatively general.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a cow split PU dry leather feel agent, comprising the following raw materials in parts by weight: 70-80 parts of Tween-60, 5-10 parts of polyoxyethylene sorbitan monostearate, 30-50 parts of sucrose stearate, 20-40 parts of octadecanoic acid, 40-200 parts of polyols, 2-15 parts of leveling agents, 50-60 parts of polyether modified polysiloxane, 20-30 parts of amino silicone oil, 10-20 parts of silane coupling agents, 5-10 parts of silicon dioxide matting powder, 30-50 parts of aziridine, 5-8 parts of defoaming agents, 100-500 parts of deionized water, and 5-15 parts of antibacterial finishing liquid.

[0006] Furthermore: the leveling agent is a polyacrylic leveling agent.

[0007] Further: the matting powder is silicon dioxide matting powder.

[0008] Furthermore: the silane coupling agent is propyltrimethoxysilane.

[0009] Furthermore, the antibacterial finishing liquid comprises the following components in parts by weight: 30-50 parts by weight of a guanidine-based antibacterial agent containing a double bond and 100-150 parts of deionized water.

[0010] Further: the polyol is polyethylene glycol.

[0011] A method for preparing a cow split PU dry-process leather feel agent comprises the following preparation steps: (1) constructing a composite emulsifier system: mixing the following raw materials in parts by weight: Tween-60, polyoxyethylene sorbitan monostearate, sucrose stearate, and octadecanoic acid, stirring evenly, and adding a polyol to obtain a material A; (2) emulsifying an organic siloxane: adding polyether-modified polysiloxane, amino silicone oil, silane coupling agent, silica matting powder, aziridine, an organic siloxane defoaming agent, and deionized water to the material A, and dispersing and emulsifying the material for 1-2 hours to obtain an emulsified organic siloxane; (3) antibacterial finishing: adding an antibacterial finishing liquid to the organic siloxane obtained in step (2), stirring evenly, and obtaining a leather feel agent.

[0012] Furthermore: the dispersion and emulsification treatment in step (2) uses a homogenizer, and the rotation speed is controlled at 5000-10000r / min.

[0013] Furthermore: the polyether-modified polysiloxane is prepared by using polysiloxane containing SiH bonds, polyethylene glycol and polypropylene glycol as raw materials and chloroplatinic acid as a catalyst through a hydrosilylation reaction.

[0014] By adopting the above technical solution, the beneficial effects of the present invention are:

[0015] 1. The present invention uses polyether-modified polysiloxane and amino silicone oil for compounding, and when used as a hand-feeling agent on leather, it has a good smooth and oily feel.

[0016] 2. The present invention uses a composite emulsifier system to emulsify and disperse the organosilane, which can make the organosilane dispersed evenly and with stable performance.

[0017] 3. The hydrophilic polyether group is introduced into the polyether-modified polysiloxane of the present invention, which can make the silicone have better anti-classic properties, and at the same time can improve the wettability, emulsification and water solubility of the hand feeling agent, so that the emulsion is not prone to demulsification and oil floating during use.

[0018] 4. Silicone is connected to the molecular chain of waterborne polyurethane, the emulsion has good stability, the coating film has high water resistance, smooth feel and improved smoothness.

[0019] 5. The hand feeling agent of the present invention has aziridine ring added in the raw material, and the aziridine ring can react with carboxyl, amino and other groups in leather fibers to make the hand feeling agent and leather fibers more firmly bonded, making the leather plump and elastic, and at the same time making the leather have better waterproof performance. DETAILED DESCRIPTION

[0020] Embodiment 1

[0021] A cow split PU dry-process leather feel agent comprises the following raw materials in parts by weight: 70 parts of Tween-60, 5 parts of polyoxyethylene sorbitan monostearate, 30 parts of sucrose stearate, 20 parts of octadecanoic acid, 40 parts of polyethylene glycol, 2 parts of polyacrylic leveling agent, 50 parts of polyether modified polysiloxane, 20 parts of amino silicone oil, 10 parts of propyltrimethoxysilane, 5 parts of silicon dioxide matting powder, 30 parts of aziridine, 5 parts of organosiloxane defoaming agent, 100 parts of deionized water and 5 parts of antibacterial finishing liquid.

[0022] The antibacterial finishing liquid comprises the following components in parts by weight: 30 parts by weight of a guanidine-based antibacterial agent containing a double bond and 100 parts by weight of deionized water.

[0023] The preparation method of the above-mentioned cow split PU dry leather feel agent comprises the following preparation steps: (1) constructing a composite emulsifier system: mixing the following raw materials in parts by weight: Tween-60, polyoxyethylene sorbitan monostearate, sucrose stearate, octadecanoic acid, stirring evenly, adding polyols to obtain material A; (2) emulsifying the organosiloxane: adding polyether modified polysiloxane, amino silicone oil, silane coupling agent, silica matting powder, aziridine, organosiloxane defoaming agent, and deionized water to material A, and dispersing and emulsifying for 1 hour to obtain emulsified organosiloxane; the dispersing and emulsifying treatment adopts a homogenizer, and the speed is controlled at 5000r / min; (3) antibacterial finishing: adding antibacterial finishing liquid to the organosiloxane obtained in step (2), stirring evenly, and obtaining a leather feel agent.

[0024] The polyether-modified polysiloxane is prepared by using polysiloxane containing SiH bonds, polyethylene glycol and polypropylene glycol as raw materials and chloroplatinic acid as a catalyst through a hydrosilylation reaction.

[0025] Embodiment 2

[0026] A cow split PU dry leather feel agent comprises the following raw materials in parts by weight: 75 parts of Tween-60, 8 parts of polyoxyethylene sorbitol monostearate, 30-50 parts of sucrose stearate, 30 parts of octadecanoic acid, 100 parts of polyethylene glycol, 8 parts of polyacrylic leveling agent, 55 parts of polyether modified polysiloxane, 25 parts of amino silicone oil, 15 parts of propyltrimethoxysilane, 7 parts of silicon dioxide matting powder, 40 parts of aziridine, 6 parts of organic silicone defoaming agent, 200 parts of deionized water and 10 parts of antibacterial finishing liquid.

[0027] The antibacterial finishing liquid comprises the following components in parts by weight: 40 parts by weight of a guanidine-based antibacterial agent containing a double bond and 120 parts by weight of deionized water.

[0028] The preparation method of the above-mentioned cow split PU dry leather feel agent comprises the following preparation steps: (1) constructing a composite emulsifier system: mixing the following raw materials in parts by weight: Tween-60, polyoxyethylene sorbitan monostearate, sucrose stearate, octadecanoic acid, stirring evenly, adding polyols to obtain material A; (2) emulsifying the organosiloxane: adding polyether modified polysiloxane, amino silicone oil, silane coupling agent, silica matting powder, aziridine, organosiloxane defoaming agent, and deionized water to material A, and dispersing and emulsifying for 1-2 hours to obtain emulsified organosiloxane; the dispersing and emulsifying treatment adopts a homogenizer, and the speed is controlled at 7000r / min; (3) antibacterial finishing: adding antibacterial finishing liquid to the organosiloxane obtained in step (2), stirring evenly, and obtaining a leather feel agent.

[0029] The polyether-modified polysiloxane is prepared by using polysiloxane containing SiH bonds, polyethylene glycol and polypropylene glycol as raw materials and chloroplatinic acid as a catalyst through a hydrosilylation reaction.

[0030] Embodiment 3

[0031] A cow split PU dry leather feel agent comprises the following raw materials in parts by weight: 80 parts of Tween-60, 10 parts of polyoxyethylene sorbitan monostearate, 50 parts of sucrose stearate, 40 parts of octadecanoic acid, 200 parts of polyethylene glycol, 15 parts of polyacrylic leveling agent, 60 parts of polyether modified polysiloxane, 30 parts of amino silicone oil, 20 parts of propyltrimethoxysilane, 10 parts of silicon dioxide matting powder, 50 parts of aziridine, 8 parts of organosiloxane defoaming agent, 500 parts of deionized water and 15 parts of antibacterial finishing liquid.

[0032] The antibacterial finishing liquid comprises the following components in parts by weight: 30-50 parts by weight of a guanidine-based antibacterial agent containing a double bond and 150 parts of deionized water.

[0033] The preparation method of the above-mentioned cow split PU dry leather feel agent comprises the following preparation steps: (1) constructing a composite emulsifier system: mixing the following raw materials in parts by weight: Tween-60, polyoxyethylene sorbitan monostearate, sucrose stearate, octadecanoic acid, stirring evenly, adding polyols to obtain material A; (2) emulsifying the organosiloxane: adding polyether modified polysiloxane, amino silicone oil, silane coupling agent, silica matting powder, aziridine, organosiloxane defoaming agent, and deionized water to material A, and dispersing and emulsifying for 1-2 hours to obtain emulsified organosiloxane; the dispersing and emulsifying treatment adopts a homogenizer, and the speed is controlled at 5000-10000 r / min; (3) antibacterial finishing: adding antibacterial finishing liquid to the organosiloxane obtained in step (2), stirring evenly, and obtaining a leather feel agent.

[0034] The polyether-modified polysiloxane is prepared by using polysiloxane containing SiH bonds, polyethylene glycol and polypropylene glycol as raw materials and chloroplatinic acid as a catalyst through a hydrosilylation reaction.

[0035] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A cow split PU dry leather feel agent, characterized in that: The invention comprises the following raw materials in parts by weight: 70-80 parts of Tween-60, 5-10 parts of polyoxyethylene sorbitol monostearate, 30-50 parts of sucrose stearate, 20-40 parts of octadecanoic acid, 40-200 parts of polyols, 2-15 parts of leveling agents, 50-60 parts of polyether-modified polysiloxanes, 20-30 parts of amino silicone oils, 10-20 parts of silane coupling agents, 5-10 parts of matting powders, 30-50 parts of aziridines, 5-8 parts of organosiloxane defoaming agents, 100-500 parts of deionized water and 5-15 parts of antibacterial finishing liquids.

2. The cow split PU dry leather feel agent according to claim 1, characterized in that: The leveling agent is a polyacrylic leveling agent.

3. The cow split PU dry leather feel agent according to claim 1, characterized in that: The matting powder is silicon dioxide matting powder.

4. The cow split PU dry leather feel agent according to claim 1, characterized in that: The silane coupling agent is propyltrimethoxysilane.

5. The cow split PU dry leather feel agent according to claim 1, characterized in that: The antibacterial finishing liquid comprises the following components in parts by weight: 30-50 parts by weight of a guanidine-based antibacterial agent containing a double bond and 100-150 parts by weight of deionized water.

6. The cow split PU dry leather feel agent according to claim 1, characterized in that: The polyol is polyethylene glycol.

7. A method for preparing a cow split PU dry leather feel agent, characterized in that: The method comprises the following preparation steps: (1) constructing a composite emulsifier system: mixing the following raw materials in parts by weight as described in claim 1: Tween-60, polyoxyethylene sorbitan monostearate, sucrose stearate, octadecanoic acid, stirring evenly, adding polyols, and obtaining material A; (2) emulsifying the organosiloxane: adding polyether-modified polysiloxane, amino silicone oil, silane coupling agent, silica matting powder, aziridine, organosiloxane defoaming agent, and deionized water to material A, and dispersing and emulsifying for 1-2 hours to obtain emulsified organosiloxane; (3) antibacterial finishing: adding antibacterial finishing liquid to the organosiloxane obtained in step (2), stirring evenly, and obtaining a leather feel agent.

8. The method for preparing a cow split PU dry leather feel agent according to claim 7, characterized in that: The dispersion and emulsification treatment in step (2) uses a homogenizer with a rotation speed controlled at 5000-10000 r / min.

9. The method for preparing a cow split PU dry leather feel agent according to claim 7, characterized in that: The polyether-modified polysiloxane is prepared by using polysiloxane containing Si-H bonds, polyethylene glycol and polypropylene glycol as raw materials and chloroplatinic acid as a catalyst through a hydrosilylation reaction.