CN115322667B - Polyurethane medium-gloss brightening agent for sheepskin and preparation method thereof - Google Patents
Polyurethane medium-gloss brightening agent for sheepskin and preparation method thereof Download PDFInfo
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- CN115322667B CN115322667B CN202210949244.9A CN202210949244A CN115322667B CN 115322667 B CN115322667 B CN 115322667B CN 202210949244 A CN202210949244 A CN 202210949244A CN 115322667 B CN115322667 B CN 115322667B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/08—Polyurethanes from polyethers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/08—Printing inks based on natural resins
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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Abstract
The invention relates to a polyurethane medium-gloss brightening agent for sheep skin and a preparation method thereof. The polyurethane medium gloss brightening agent for sheep skin comprises the following raw materials in parts by weight: 30-40 parts of deionized water, 10-20 parts of aqueous aliphatic polyether self-extinction polyurethane dispersion, 10-15 parts of aqueous medium-soft high-physical-property aliphatic polycarbonate polyurethane emulsion, 20-30 parts of aqueous medium-soft transparent aliphatic polyether polyurethane emulsion, 10-15 parts of aqueous nonionic polyurethane emulsion, 1-2 parts of polysiloxane-polyether copolymer, 1-2 parts of polysiloxane emulsion, 1-2 parts of sulfated castor oil, 0.5-3 parts of suspension stabilizer, 0.2-1 part of preservative and 0.1-1 part of pH regulator. The light brightening agent in the polyurethane for the sheepskin is compounded by a plurality of emulsions, has good comprehensive performance, can obviously improve the physical properties of a coating, and does not influence the softness and light foam feel of the sheepskin.
Description
Technical Field
The invention belongs to the field of leather finishing, and particularly relates to a polyurethane medium-gloss brightening agent for sheep skin and a preparation method thereof.
Background
The brightening agent is used as the top layer material for leather finishing and has important influence on the external appearance, hygienic property and physical and mechanical properties of leather products. At present, the types of the intermediate gloss brightening agent used for leather finishing mainly comprise two types of aqueous polyurethane resin and nitrocotton.
For the base material, the sheepskin has loose and fine fiber braiding and fine grain pores, has general mechanical properties, but has soft and light handfeel, so the coating is required to be light, thin and soft, and has good adhesion degree with the skin embryo, and the handfeel of the sheepskin is not influenced. At present, although the light brightening agent in nitrocotton with dominant top layer coating of sheepskin has comfortable hand feeling and natural luster, the yellowing resistance is poor, the physical properties are general, and the product is compounded by a large amount of organic solvents, so that the requirements of environmental protection and green development are not met. The traditional light brightening agent in the aqueous polyurethane can obviously improve the physical properties of dry resistance, wet resistance, abrasion resistance and the like of the leather coating, but has a hard and thick hand feeling, and can only be used for sheepskin in a small amount. In recent years, although some softer products have been proposed in the market, there are drawbacks such as tackiness by standing and deterioration of physical properties. Other types of brighteners have their inherent disadvantages: acrylic resins have a general feel and physical properties; casein has poor dry and wet rub resistance and hygroscopicity; the oil wax product is similar to nitrocotton, has good hand feeling, yellowing and poor physical property.
Therefore, the technical scheme of the invention is provided based on the above.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a brightening agent in polyurethane for sheepskin and a preparation method thereof. The light brightening agent in the polyurethane for the sheepskin is compounded by a plurality of emulsions, has good comprehensive performance, can obviously improve the physical properties of a coating, and does not influence the softness and light foam feel of the sheepskin.
The scheme of the invention provides a polyurethane medium-gloss brightening agent for sheep skin, which comprises the following raw materials in parts by weight: 30-40 parts of deionized water, 10-20 parts of aqueous aliphatic polyether self-extinction polyurethane dispersion, 10-15 parts of aqueous medium-soft high-physical-property aliphatic polycarbonate polyurethane emulsion, 20-30 parts of aqueous medium-soft transparent aliphatic polyether polyurethane emulsion, 10-15 parts of aqueous nonionic polyurethane emulsion, 1-2 parts of polysiloxane-polyether copolymer, 1-2 parts of polysiloxane emulsion, 1-2 parts of sulfated castor oil, 0.5-3 parts of suspension stabilizer, 0.2-1 part of preservative and 0.1-1 part of pH regulator.
Preferably, the light brightening agent in the polyurethane for sheepskin comprises the following raw materials in parts by weight: 35 parts of deionized water, 15 parts of aqueous aliphatic polyether self-extinction polyurethane dispersion, 12.5 parts of aqueous medium-soft high-physical-property aliphatic polycarbonate polyurethane emulsion, 25 parts of aqueous medium-soft transparent aliphatic polyether polyurethane emulsion, 12.5 parts of aqueous nonionic polyurethane emulsion, 1.5 parts of polysiloxane-polyether copolymer, 1.5 parts of polysiloxane emulsion, 1.5 parts of sulfated castor oil, 1.7 parts of suspension stabilizer, 0.6 part of preservative and 0.5 part of pH regulator.
Preferably, the pH regulator is one or a combination of more than two of sodium hydroxide solution, ammonia water and organic amine alkaline auxiliary agents; the suspension stabilizer comprises one or more than two of a commercially available conventional inorganic anti-settling agent, a cellulose thickener and an acrylic acid and polyurethane thickener.
Based on the same technical concept, the invention also provides a preparation method of the light brightening agent in the polyurethane for sheep skin, which comprises the following steps:
(1) Adding deionized water, polysiloxane-polyether copolymer and sulfated castor oil into a dispersing kettle, and uniformly stirring and dispersing to obtain a first mixed solution;
(2) Adding aqueous aliphatic polyether self-extinction polyurethane dispersion, aqueous medium-soft high-physical-property aliphatic polycarbonate polyurethane emulsion, aqueous medium-soft transparent aliphatic polyether polyurethane emulsion, aqueous nonionic polyurethane emulsion, polysiloxane emulsion and preservative into the first mixed solution, and uniformly stirring and dispersing to obtain a second mixed solution;
(3) Diluting the pH regulator and then adding the diluted pH regulator into the second mixed solution to obtain a third mixed solution;
(4) Slowly adding the suspension stabilizer into the third mixed solution, and uniformly dispersing to obtain the light brightening agent in the polyurethane for the sheep skin.
Preferably, in the step (2), the stirring time is 30-50 min.
Preferably, in the step (2), the stirring rotation speed is 300-400 r/min.
Preferably, in the step (3), the pH of the third mixed solution is 8.0 to 9.0.
Preferably, in the step (4), the viscosity of the gloss agent in the polyurethane for sheepskin is 1500-2000 mpa·s.
The beneficial effects of the invention are as follows:
the brightening agent in the polyurethane for the sheepskin is prepared by compounding a plurality of emulsions, wherein: the aqueous aliphatic polyether self-extinction polyurethane dispersoid is dispersoid particles with large particle size (generally between 1 and 10 mu m) and difficult deformation, and in the film forming process, the particles are mutually fused and assembled to form a continuous rough surface, so that the diffuse reflection of a coating film is increased to obtain extinction performance. The hand feeling is dry and fine, the plastic feeling and the load feeling of the common polyurethane resin film can be reduced, and the sticky problem is avoided; the aqueous medium-soft high-physical property aliphatic carbon polyurethane emulsion is soft in film formation, and has excellent wear resistance, water resistance and solvent resistance; the aqueous medium soft transparent aliphatic polyether polyurethane emulsion is soft and transparent in film formation, high in elongation and good in rebound resilience, and can remarkably improve the flexibility resistance and wet rub resistance of the coating; the aqueous nonionic polyurethane emulsion film is very soft, light and thin, and can endow leather with elegant luster and natural light coating feel; the sulfated castor oil emulsion can further reduce the plastic feel of the coating, endow the coating with fine and soft touch feeling, and has good inhibition effect on bubbles generated by mechanical stirring because the sulfated castor oil emulsion has hydrophilic and lipophilic groups; the polysiloxane emulsion has low molecular weight compared with the common silicon handfeel agent products, and has fine and natural handfeel and no fake slip; the polysiloxane-polyether copolymer can reduce the surface tension of the system, so that the emulsion is more compatible with the substrate. In conclusion, the combination of the resin after compounding not only can keep the excellent physical properties of the product, but also does not influence the softness and light foam feeling of the sheepskin, and has excellent comprehensive performance.
The preparation method of the brightening agent in the polyurethane for the sheepskin provided by the invention can be used for sequentially mixing the components, has a controllable process, and is beneficial to large-scale production.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.
Example 1
The embodiment provides a preparation method of a light brightening agent in polyurethane for sheepskin, which comprises the following steps:
(1) Adding deionized water, polysiloxane-polyether copolymer and sulfated castor oil into a dispersing kettle, and uniformly stirring and dispersing to obtain a first mixed solution;
(2) Adding aqueous aliphatic polyether self-extinction polyurethane dispersion, aqueous medium-soft high-physical-property aliphatic polycarbonate polyurethane emulsion, aqueous medium-soft transparent aliphatic polyether polyurethane emulsion, aqueous nonionic polyurethane emulsion, polysiloxane emulsion and preservative into the first mixed solution, stirring at the speed of 400r/min for 30min, and uniformly dispersing to obtain a second mixed solution;
(3) Diluting sodium hydroxide solution, adding the diluted sodium hydroxide solution into the second mixed solution, and regulating the pH of the system to 8.0 to obtain a third mixed solution;
(4) Slowly adding the suspension stabilizer into the third mixed solution, regulating the viscosity to 1500 mpa.s, and uniformly dispersing to obtain the light brightening agent in the polyurethane for the sheep skin.
Wherein the amounts of the raw materials used are shown in Table 1.
TABLE 1 raw materials amounts for example 1
Example 2
The embodiment provides a preparation method of a light brightening agent in polyurethane for sheepskin, which comprises the following steps:
(1) Adding deionized water, polysiloxane-polyether copolymer and sulfated castor oil into a dispersing kettle, and uniformly stirring and dispersing to obtain a first mixed solution;
(2) Adding aqueous aliphatic polyether self-extinction polyurethane dispersion, aqueous medium-soft high-physical-property aliphatic polycarbonate polyurethane emulsion, aqueous medium-soft transparent aliphatic polyether polyurethane emulsion, aqueous nonionic polyurethane emulsion, polysiloxane emulsion and preservative into the first mixed solution, stirring at the speed of 300r/min for 50min, and uniformly dispersing to obtain a second mixed solution;
(3) Diluting ammonia water, adding the diluted ammonia water into the second mixed solution, and regulating the pH value of the system to 9.0 to obtain a third mixed solution;
(4) Slowly adding the suspension stabilizer into the third mixed solution, regulating the viscosity to 2000 mpa.s, and uniformly dispersing to obtain the light brightening agent in the polyurethane for the sheep skin.
Wherein the amounts of the raw materials used are shown in Table 2.
TABLE 2 raw material usage of example 2
| Raw materials | Dosage of |
| Deionized water | 40kg |
| Aqueous aliphatic polyether self-extinction polyurethane dispersoid | 20kg |
| Aqueous medium-soft high-physical-property aliphatic carbon-polymerized polyurethane emulsion | 15kg |
| Aqueous medium soft transparent aliphatic polyether polyurethane emulsion | 30kg |
| Aqueous nonionic polyurethane emulsion | 15kg |
| Polysiloxane-polyether copolymer | 2kg |
| Polysiloxane emulsion | 2kg |
| Sulfated castor oil | 2kg |
| Suspension stabilizer | 3kg |
| Preservative agent | 1kg |
| Ammonia water | 1kg |
Example 3
The embodiment provides a preparation method of a light brightening agent in polyurethane for sheepskin, which comprises the following steps:
(1) Adding deionized water, polysiloxane-polyether copolymer and sulfated castor oil into a dispersing kettle, and uniformly stirring and dispersing to obtain a first mixed solution;
(2) Adding aqueous aliphatic polyether self-extinction polyurethane dispersion, aqueous medium-soft high-physical-property aliphatic polycarbonate polyurethane emulsion, aqueous medium-soft transparent aliphatic polyether polyurethane emulsion, aqueous nonionic polyurethane emulsion, polysiloxane emulsion and preservative into the first mixed solution, stirring at the speed of 300r/min for 50min, and uniformly dispersing to obtain a second mixed solution;
(3) Diluting an organic amine alkaline auxiliary agent, adding the diluted organic amine alkaline auxiliary agent into the second mixed solution, and regulating the pH value of the system to 9.0 to obtain a third mixed solution;
(4) Slowly adding the suspension stabilizer into the third mixed solution, regulating the viscosity to 2000 mpa.s, and uniformly dispersing to obtain the light brightening agent in the polyurethane for the sheep skin.
Wherein the amounts of the raw materials used are shown in Table 3.
TABLE 3 raw material usage of example 3
| Raw materials | Dosage of |
| Deionized water | 35kg |
| Aqueous aliphatic polyether self-extinction polyurethane dispersoid | 15kg |
| Aqueous medium-soft high-physical-property aliphatic carbon-polymerized polyurethane emulsion | 12.5kg |
| Aqueous medium soft transparent aliphatic polyether polyurethane emulsion | 25kg |
| Aqueous nonionic polyurethane emulsion | 12.5kg |
| Polysiloxane-polyether copolymer | 1.5kg |
| Polysiloxane emulsion | 1.5kg |
| Sulfated castor oil | 1.5kg |
| Suspension stabilizer | 1.7kg |
| Preservative agent | 0.6kg |
| Organic amine alkaline auxiliary agent | 0.5kg |
Application example
The application example provides an application method of a brightening agent, which comprises the following steps:
(1) Selecting sheepskin clothing leather, carrying out cationic back cover for 1 time, standing for 4 hours and scalding;
(2) Spraying the flour paste for 2 times, ironing and spraying the flour paste for 2 times;
(3) Spraying brightening agent for 2 times (spraying amount is 1.2-1.4 g/sf), and milling until the grains are natural;
(4) Observing the glossiness uniformity, blackness and touch feeling, and checking after 24 hours.
Test case
The following 3 brighteners were selected for testing:
(1) The neutral gloss reducing agent obtained in example 3 (experimental group);
(2) Commercially available conventional nitrocotton brightening agents (comparative group 1);
(3) The light brightener in the conventional polyurethane commercially available (comparative group 2).
The test results are shown in Table 4.
TABLE 4 detection results
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. The polyurethane medium-gloss brightening agent for sheep skin is characterized by comprising the following raw materials in parts by weight: 30-40 parts of deionized water, 10-20 parts of aqueous aliphatic polyether self-extinction polyurethane dispersion, 10-15 parts of aqueous medium soft high physical property aliphatic polycarbonate polyurethane emulsion, 20-30 parts of aqueous medium soft transparent aliphatic polyether polyurethane emulsion, 10-15 parts of aqueous nonionic polyurethane emulsion, 1-2 parts of polysiloxane-polyether copolymer, 1-2 parts of polysiloxane emulsion, 1-2 parts of sulfated castor oil, 0.5-3 parts of suspension stabilizer, 0.2-1 part of preservative and 0.1-1 part of pH regulator;
the pH regulator is one or the combination of more than two of sodium hydroxide solution, ammonia water and organic amine alkaline auxiliary agents;
the preparation method of the brightening agent in the polyurethane for the sheepskin comprises the following steps:
(1) Adding deionized water, polysiloxane-polyether copolymer and sulfated castor oil into a dispersing kettle, and uniformly stirring and dispersing to obtain a first mixed solution;
(2) Adding aqueous aliphatic polyether self-extinction polyurethane dispersion, aqueous medium-soft high-physical-property aliphatic polycarbonate polyurethane emulsion, aqueous medium-soft transparent aliphatic polyether polyurethane emulsion, aqueous nonionic polyurethane emulsion, polysiloxane emulsion and preservative into the first mixed solution, and uniformly stirring and dispersing to obtain a second mixed solution;
(3) Diluting the pH regulator and then adding the diluted pH regulator into the second mixed solution to obtain a third mixed solution;
(4) Slowly adding the suspension stabilizer into the third mixed solution, and uniformly dispersing to obtain the light brightening agent in the polyurethane for the sheep skin.
2. The light brightening agent for sheepskin polyurethane according to claim 1, comprising the following raw materials in parts by weight: 35 parts of deionized water, 15 parts of aqueous aliphatic polyether self-extinction polyurethane dispersion, 12.5 parts of aqueous medium-soft high-physical-property aliphatic polycarbonate polyurethane emulsion, 25 parts of aqueous medium-soft transparent aliphatic polyether polyurethane emulsion, 12.5 parts of aqueous nonionic polyurethane emulsion, 1.5 parts of polysiloxane-polyether copolymer, 1.5 parts of polysiloxane emulsion, 1.5 parts of sulfated castor oil, 1.7 parts of suspension stabilizer, 0.6 part of preservative and 0.5 part of pH regulator.
3. The light brightening agent for sheepskin polyurethane according to claim 1, wherein in the step (2), the stirring time is 30-50 min.
4. The light brightening agent for sheepskin polyurethane according to claim 1, wherein in step (2), the stirring speed is 300-400 r/min.
5. The light-polishing agent for sheepskin polyurethane according to claim 1, wherein in the step (3), the pH of the third mixed solution is 8.0 to 9.0.
6. The polishing agent for sheepskin polyurethane according to claim 1, wherein in the step (4), the viscosity of the polishing agent for sheepskin polyurethane is 1500 to 2000mpa·s.
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| CN202210949244.9A CN115322667B (en) | 2022-08-09 | 2022-08-09 | Polyurethane medium-gloss brightening agent for sheepskin and preparation method thereof |
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| CN202210949244.9A CN115322667B (en) | 2022-08-09 | 2022-08-09 | Polyurethane medium-gloss brightening agent for sheepskin and preparation method thereof |
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| CN115322667B true CN115322667B (en) | 2023-08-25 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007084730A (en) * | 2005-09-22 | 2007-04-05 | Nippon Polyurethane Ind Co Ltd | Aqueous polyurethane resin coating agent composition and coating composition having excellent soft feel property |
| JP2008303284A (en) * | 2007-06-07 | 2008-12-18 | Asahi Kasei Chemicals Corp | Aqueous polyurethane dispersion, and aqueous dispersion composition for soft feel paint using the same |
| CN105419606A (en) * | 2015-12-23 | 2016-03-23 | 四川达威科技股份有限公司 | Aqueous polyurethane matting agent and preparation method of same |
| CN111718646A (en) * | 2020-07-07 | 2020-09-29 | 上海金狮化工有限公司 | Waterborne polyurethane leather brightener and preparation method thereof |
| CN112500776A (en) * | 2020-11-19 | 2021-03-16 | 明新孟诺卡(江苏)新材料有限公司 | Zero-solvent waterborne polyurethane external-matting leather finishing agent and preparation method thereof |
-
2022
- 2022-08-09 CN CN202210949244.9A patent/CN115322667B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007084730A (en) * | 2005-09-22 | 2007-04-05 | Nippon Polyurethane Ind Co Ltd | Aqueous polyurethane resin coating agent composition and coating composition having excellent soft feel property |
| JP2008303284A (en) * | 2007-06-07 | 2008-12-18 | Asahi Kasei Chemicals Corp | Aqueous polyurethane dispersion, and aqueous dispersion composition for soft feel paint using the same |
| CN105419606A (en) * | 2015-12-23 | 2016-03-23 | 四川达威科技股份有限公司 | Aqueous polyurethane matting agent and preparation method of same |
| CN111718646A (en) * | 2020-07-07 | 2020-09-29 | 上海金狮化工有限公司 | Waterborne polyurethane leather brightener and preparation method thereof |
| CN112500776A (en) * | 2020-11-19 | 2021-03-16 | 明新孟诺卡(江苏)新材料有限公司 | Zero-solvent waterborne polyurethane external-matting leather finishing agent and preparation method thereof |
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