阅读说明：本技术 一种具有虹彩效果的皮革颜料膏及其制备方法 (Leather pigment paste with iridescent effect and preparation method thereof ) 是由 段向阳 朱阳升 高梦华 杨斯盛 于 2020-06-02 设计创作，主要内容包括：本发明涉及一种具有虹彩效果的皮革颜料膏及其制备方法。所述具有虹彩效果的皮革颜料膏包括如下重量份的原料：去离子水50～65份、分散剂8～15份、润湿剂0.5～2份、pH调节剂0.5～2份、虹彩效果颜料15～25份、抑泡剂0.1～0.5份、定向助剂0.5～1.5份、流变改性剂1～5份、消泡剂0.1～0.5份、保湿剂1～5份和防腐剂0.1～0.5份。所述颜料膏具有分散稳定性好、虹彩效果明显、雾化性能佳的优势,并能根据反射的光量来实现虹彩度。适用于皮革涂饰层,与涂饰剂中的各类树脂的相容性好；所述制备方法工艺简单易控,有利于规模化产出。(The invention relates to leather pigment paste with iridescent effect and a preparation method thereof. The leather pigment paste with the iridescent effect comprises the following raw materials in parts by weight: 50-65 parts of deionized water, 8-15 parts of a dispersing agent, 0.5-2 parts of a wetting agent, 0.5-2 parts of a pH regulator, 15-25 parts of an iridescent effect pigment, 0.1-0.5 part of a foam inhibitor, 0.5-1.5 parts of an orientation auxiliary agent, 1-5 parts of a rheological modifier, 0.1-0.5 part of a defoaming agent, 1-5 parts of a humectant and 0.1-0.5 part of a preservative. The pigment paste has the advantages of good dispersion stability, obvious iridescence effect and good atomization performance, and can realize iridescence according to the reflected light quantity. The coating is suitable for leather coating layers, and has good compatibility with various resins in the coating agent; the preparation method is simple and easy to control in process and is beneficial to large-scale production.)

1. The leather pigment paste with the iridescent effect is characterized by comprising the following raw materials in parts by weight: 50-65 parts of deionized water, 8-15 parts of a dispersing agent, 0.5-2 parts of a wetting agent, 0.5-2 parts of a pH regulator, 15-25 parts of an iridescent effect pigment, 0.1-0.5 part of a foam inhibitor, 0.5-1.5 parts of an orientation auxiliary agent, 1-5 parts of a rheological modifier, 0.1-0.5 part of a defoaming agent, 1-5 parts of a humectant and 0.1-0.5 part of a preservative.

2. The leather pigment paste with iridescent effect according to claim 1, characterized by comprising the following raw materials in parts by weight: 57.5 parts of deionized water, 11.5 parts of dispersing agent, 1.25 parts of wetting agent, 1.25 parts of pH regulator, 20 parts of iridescent effect pigment, 0.3 part of foam inhibitor, 1 part of oriented assistant, 3 parts of rheology modifier, 0.3 part of defoaming agent, 3 parts of humectant and 0.3 part of preservative.

3. The leather pigment paste having an iridescent effect according to claim 1 or 2, wherein said wetting agent is one of polyoxyethylene alkylphenol ether, polyoxyethylene fatty alcohol ether or polyoxyethylene polyoxypropylene block copolymer; the pH regulator is triethanolamine, AMP-95 or NH₃·H₂One of O; the orientation auxiliary agent is one of water-based polyamide wax, ethylene-vinyl acetate copolymer or aralkyl modified organic silicon; the rheology modifier is one of ethylene glycol distearate, polyacrylate or sodium carboxymethylcellulose; the foam inhibitor is a polyether foam inhibitor; said medicineThe foaming agent is one of a water-based mineral oil defoaming agent, an organic silicon defoaming agent or an acetylene glycol defoaming agent; the humectant is one of propylene glycol, polyethylene glycol or isopropanol; the preservative is one of bronopol, a kasong preservative or a DCOIT mildew-proof bactericide.

4. A process for the preparation of a leather pigment paste with iridescent effect according to claim 1 or 2, characterized by comprising the following steps:

(1) dividing the deionized water into two parts to obtain deionized water a and deionized water b; mixing the deionized water a with a dispersing agent, a wetting agent, a foam inhibitor and a pH regulator, and then dispersing and stirring to obtain a prefabricated dispersion liquid a;

(2) increasing the stirring speed, sequentially adding the directional assistant and the iridescent effect pigment, continuously stirring, increasing the stirring speed for the second time, and obtaining a prefabricated dispersion liquid b after stirring;

(3) reducing the stirring speed, and adding a defoaming agent for defoaming to obtain a prefabricated dispersion liquid c;

(4) and (3) maintaining the stirring speed, adding the humectant and the preservative into the prefabricated dispersion liquid c, adding the rheology modifier, continuously stirring, adding the deionized water b, and filtering to obtain the leather pigment paste with the iridescent effect.

5. The method for preparing leather pigment paste with iridescent effect according to claim 4, wherein in step (1), the weight ratio of the deionized water a to the deionized water b is 40-55: 10.

6. The method for preparing leather pigment paste with iridescent effect according to claim 4, wherein in step (1), the rotation speed of the dispersion stirring is 200-500 r/min, and the time of the dispersion stirring is 15-60 min.

7. The method for preparing leather pigment paste with iridescent effect according to claim 4, wherein in step (2), the stirring speed is increased to 500-800 r/min, the stirring duration is 30-120 min, and the stirring speed is increased to 800-1200 r/min for the second time.

8. The method for preparing leather pigment paste with iridescent effect according to claim 4, wherein in step (2), the particle size of the system of the pre-prepared dispersion b is 30-40 μm.

9. The method for preparing leather pigment paste with iridescent effect according to claim 4, wherein in step (3), the stirring speed is reduced to 100-300 r/min.

10. The method for preparing leather pigment paste with iridescent effect according to claim 4, wherein in step (4), the stirring is continued for 60-70 min.

Technical Field

The invention belongs to the field of pigments, and particularly relates to leather pigment paste with an iridescent effect and a preparation method thereof.

Background

Aqueous leather pigment pastes, which are a generic name for aqueous dispersions of pigments in the leather industry, are the most common type of leather finishing colorant, primarily combined with film-forming leather finishes, and serve primarily to mask minor imperfections and undertones on the leather surface and impart various colors to the leather coating. In terms of color effect, common leather pigment pastes have solid color, double-color effect, fluorescence effect, common pearlescent effect and the like. In recent years, the demand for special colors in the leather fields such as bags and belts is higher and higher, and the iridescent pigment paste has a more fashionable and layered coloring effect, replaces the personalized demand which cannot be met by the common pigment paste, and is bound to be paid attention by the leather industry.

The iridescent effect pigment paste has interference conversion colors similar to rainbow yellow, red, purple, blue and green, the crystal structure of the used pigment is rutile type, and the pigment has good light stability and color migration resistance, but the characteristic of multilayer metal oxide coating of the pigment is not beneficial to anchoring of a dispersing agent and difficult to form stable dispersion by adsorption. Based on the application examples in the automobile paint industry at present, pigment powder is directly added into the automobile paint and is not prefabricated into pigment paste (or color paste) for use; in the leather industry, iridescent effect pigment paste and similar products are not yet available. In addition, the compatibility of different resin systems is different in the actual use process, and the atomization performance is difficult to control. For the technical field, the problem to be solved is to develop an iridescent effect pigment paste with good dispersibility, stable quality and simple process for the water-based coating direction of leather.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides leather pigment paste with an iridescent effect and a preparation method thereof. The pigment paste has the advantages of good dispersion stability, obvious iridescence effect and good atomization performance, and can realize iridescence according to the reflected light quantity. Is suitable for leather coating, and has good compatibility with various resins in the coating agent.

The scheme of the invention is to provide leather pigment paste with an iridescent effect, which comprises the following raw materials in parts by weight: 50-65 parts of deionized water, 8-15 parts of a dispersing agent, 0.5-2 parts of a wetting agent, 0.5-2 parts of a pH regulator, 15-25 parts of an iridescent effect pigment, 0.1-0.5 part of a foam inhibitor, 0.5-1.5 parts of an orientation auxiliary agent, 1-5 parts of a rheological modifier, 0.1-0.5 part of a defoaming agent, 1-5 parts of a humectant and 0.1-0.5 part of a preservative.

Preferably, the leather pigment paste with the iridescent effect comprises the following raw materials in parts by weight: 57.5 parts of deionized water, 11.5 parts of dispersing agent, 1.25 parts of wetting agent, 1.25 parts of pH regulator, 20 parts of iridescent effect pigment, 0.3 part of foam inhibitor, 1 part of oriented assistant, 3 parts of rheology modifier, 0.3 part of defoaming agent, 3 parts of humectant and 0.3 part of preservative.

Preferably, the wetting agent is one of polyoxyethylene alkylphenol ether, polyoxyethylene fatty alcohol ether or polyoxyethylene polyoxypropylene block copolymer; the pH regulator is triethanolamine, AMP-95 or NH₃·H₂One or more of O, or a combination of two or more of O; the orientation auxiliary agent is one of water-based polyamide wax, ethylene-vinyl acetate copolymer or aralkyl modified organic silicon, or the combination of more than two of the water-based polyamide wax, the ethylene-vinyl acetate copolymer or the aralkyl modified organic silicon; the rheology modifier is one of ethylene glycol distearate, polyacrylate, sodium carboxymethylcellulose, associative polyurethane thickener, fumed silica or hydroxyethyl cellulose; the foam inhibitor is a polyether foam inhibitor; the defoaming agent is one of a water-based mineral oil defoaming agent, an organic silicon defoaming agent or an acetylene glycol defoaming agent, or the combination of more than two of the water-based mineral oil defoaming agent, the organic silicon defoaming agent or the acetylene glycol defoaming agent; the humectant is one of propylene glycol, polyethylene glycol, isopropanol or m-butanediol, or the combination of more than two of the propylene glycol, the polyethylene glycol, the isopropanol or the m-butanediol; the preservative is one of bronopol, Kathon preservative or DCOIT mildew-proof bactericide, or the combination of more than two of the bronopol, the Kathon preservative or the DCOIT mildew-proof bactericide.

Wherein, the grain diameter of the iridescent effect pigment is 2-100 μm, and the iridescent interference color can be presented, and the interference color can present different iridescent effects according to different thicknesses of the coating (titanium dioxide or other metal oxides).

It is emphasized that, due to the difficult anchoring properties of the iridescent effect pigment surface, the dispersant used is a block polymer having a plurality of anchor groups (such as one of an acrylic block copolymer with pigment affinity groups or an ionic copolymer of silicone-modified polysiloxane). The dispersant has good anchoring effect on iridescent effect pigment and excellent stability after dispersion.

Based on the same technical concept, the invention further provides a preparation method of the leather pigment paste with the iridescent effect, which comprises the following steps:

(1) dividing the deionized water into two parts to obtain deionized water a and deionized water b; mixing the deionized water a with a dispersing agent, a wetting agent, a foam inhibitor and a pH regulator, and then dispersing and stirring to obtain a prefabricated dispersion liquid a;

(2) increasing the stirring speed, sequentially adding the directional assistant and the iridescent effect pigment, continuously stirring, increasing the stirring speed for the second time, and obtaining a prefabricated dispersion liquid b after stirring;

(3) reducing the stirring speed, and adding a defoaming agent for defoaming to obtain a prefabricated dispersion liquid c;

(4) and (3) maintaining the stirring speed, adding the humectant and the preservative into the prefabricated dispersion liquid c, adding the rheology modifier, continuously stirring, adding the deionized water b, and filtering to obtain the leather pigment paste with the iridescent effect.

Preferably, in the step (1), the weight ratio of the deionized water a to the deionized water b is 40-55: 10.

Preferably, in the step (1), the rotation speed of the dispersion stirring is 200-500 r/min, and the time of the dispersion stirring is 15-60 min.

Preferably, in the step (2), the stirring speed is increased to 500-800 r/min, the continuous stirring time is 30-120 min, and the stirring speed is increased to 800-1200 r/min for the second time.

Preferably, in the step (2), the system particle size of the pre-prepared dispersion liquid b is 30-40 μm.

Preferably, in the step (3), the stirring speed is reduced to 100-300 r/min.

Preferably, in the step (4), the continuous stirring time is 60-70 min.

The invention has the beneficial effects that:

1. the leather pigment paste with the iridescent effect ensures that the iridescent pigment has an excellent dispersion state through scientific proportioning and dispersion processes of all components. The pigment has good stability and is not easy to coarsen, sink and delaminate. In addition, the solvating chain segment of the dispersing agent has good compatibility in coating systems such as acrylic acid, polyurethane and the like, so that the colorful pigment paste has good applicability to different systems in the application process, no aggregation point in spraying and good atomization performance.

2. The preparation method of the leather pigment paste with the iridescent effect is simple and easy to control in process and is beneficial to large-scale production.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a photograph showing the state of the leather pigment paste having an iridescent effect according to the present invention after storage at 45 ℃ for 30 days.

FIG. 2 is a photograph showing the effects of applying the rainbow effect leather pigment paste according to the present invention.

FIG. 3 is a photograph showing the coating effect of the same type of commercially available products.

FIG. 4 is a photograph showing the effect of coating the leather pigment paste obtained in example 3.

FIG. 5 is a photograph showing the effect of coating the leather pigment paste obtained in the comparative example.

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 is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.