阅读说明：本技术 一种水性碱减量超纤着色剂及其制备方法 (Aqueous alkali-decrement microfiber colorant and preparation method thereof ) 是由 袁志军 顾乾柳 陈德志 刘灰灰 于 2021-10-19 设计创作，主要内容包括：一种水性碱减量超纤着色剂,由分散剂、润湿剂、有机颜料、纯水和消泡剂制备而成；其中,分散剂的质量百分比为2-5%,润湿剂的质量百分比为5-8%；颜料的质量百分比为35-40%,纯水质量百分比为50-55%,消泡剂的质量百分比为0.2-0.5%。本发明超纤着色剂制备工艺包括配料、初步润湿搅拌、砂磨机研磨、粒径测试、调配,形成成品。本发明超纤着色剂能够有效提高颜料含量同时使颜料有良好的分散性及展色性,具有良好的储存稳定性。本发明将超纤合成革行业从溶剂型转为水性超纤革的颜料着色,替代染色工艺,大大减少了VOC的排放及废水产生,降低了能耗。(An aqueous alkali-decrement microfiber colorant is prepared from a dispersant, a wetting agent, an organic pigment, pure water and a defoaming agent; wherein, the mass percent of the dispersant is 2-5%, and the mass percent of the wetting agent is 5-8%; 35-40% of pigment, 50-55% of pure water and 0.2-0.5% of defoaming agent. The preparation process of the microfiber colorant comprises the steps of material proportioning, primary wetting and stirring, grinding by a sand mill, particle size testing and blending to form a finished product. The microfiber colorant can effectively improve the pigment content, enables the pigment to have good dispersibility and color developability, and has good storage stability. The invention changes the solvent type of the microfiber synthetic leather industry into the pigment coloring of the water-based microfiber leather, replaces the dyeing process, greatly reduces the discharge of VOC and the generation of waste water, and reduces the energy consumption.)

1. The aqueous alkali-deweighting microfiber colorant is characterized by being prepared from a dispersing agent, a wetting agent, an organic pigment, pure water and an antifoaming agent; wherein, the mass percent of the dispersant is 2-5%, and the mass percent of the wetting agent is 5-8%; 35-40% of pigment, 50-55% of pure water and 0.2-0.5% of defoaming agent;

the dispersant is an acrylic acid modified maleic anhydride dispersant; the wetting agent is isomeric alcohol polyoxyethylene ether; the organic pigment is phthalocyanine blue 15: 3. pigment red 254, furnace high pigment carbon black p.bl.6 or pigment yellow 83; the defoaming agent is an organic silicon defoaming agent.

2. The aqueous alkali-deweighted microfiber colorant according to claim 1, wherein said colorant is prepared by the following method:

(1) adding a wetting agent, a dispersing agent, a defoaming agent and water into a stirring kettle in sequence, and stirring for 10min at the rotating speed of a dispersion machine of 500 r/min;

(2) adding organic pigment, and stirring at 1500r/min for 1 h;

(3) adding the mixture obtained in the step (2) into a sand mill for grinding for 2-3 times, wherein the particle size D97 of the pigment is less than 5 um;

(4) and (4) adding the mixture obtained in the step (3) into a blending kettle for blending, detecting and packaging.

3. The aqueous alkali-reduced microfiber colorant according to claim 2, wherein said sand mill is a 5mm zirconium bead sand mill.

Technical Field

The invention relates to a water-based alkali-decrement microfiber colorant and a preparation method thereof, belonging to the technical field of microfiber leather preparation.

Background

Superfine fiber synthetic leather is a 3 rd generation synthetic leather product, takes non-woven fabric with a three-dimensional reticular structure made of superfine fibers as a base material, has a polyurethane elastomer reticular structure and a nylon bundle-shaped structure, simulates the microstructure of dermal collagen, and is endowed with excellent thermodynamic property, rebound resilience, softness and fullness just because of the existence of the special structures. The microfiber leather is the best substitute of natural leather, and is developed rapidly in China, and the national synthetic leather product in 2021 year is about 3 hundred million m²It accounts for more than 90% of the global yield.

The existing production process flow of the aqueous microfiber leather is shown in figure 1. According to the process characteristics of alkali weight reduction of the aqueous microfiber leather, the coloring agent is added in the impregnation section, so that the coloring agent is required not to change color at the temperature of 85-100 ℃ in a 10% sodium hydroxide solution.

At present, microfiber leather produced in China is almost all solvent-based, and the use of a large amount of organic solvents causes environmental pollution and resource waste. With the implementation of a series of national environmental protection laws and regulations, the industry of microfiber synthetic leather is bound to change from solvent type to water type. The dyeing process of the water-based microfiber leather is generally back-stage dyeing, a large amount of wastewater is generated in the process, and energy consumption is increased, so that the research and development of the coloring agent in the impregnation stage of the microfiber leather are particularly important.

Disclosure of Invention

The invention aims to solve the problem of coloring the front section of water-based microfiber leather so as to reduce the dyeing process of the rear section of the microfiber leather, and provides a water-based alkali-decrement microfiber colorant and a preparation method thereof.

The technical scheme of the invention is that the aqueous alkali-decrement microfiber colorant is prepared from a dispersant, a wetting agent, an organic pigment, pure water and a defoaming agent; wherein, the mass percent of the dispersant is 2-5%, and the mass percent of the wetting agent is 5-8%; 35-40% of pigment, 50-55% of pure water and 0.2-0.5% of defoaming agent.

The dispersant is an acrylic acid modified maleic anhydride dispersant; the wetting agent is isomeric alcohol polyoxyethylene ether; the organic pigment is phthalocyanine blue 15: 3. pigment red 254, furnace high pigment carbon black p.bl.6 or pigment yellow 83; the defoaming agent is an organic silicon defoaming agent.

The preparation method of the aqueous alkali-reduced microfiber colorant comprises the following steps:

(1) adding a wetting agent, a dispersing agent, a defoaming agent and water into a stirring kettle in sequence, and stirring for 10min at the rotating speed of a dispersion machine of 500 r/min;

(2) adding organic pigment, and stirring at 1500r/min for 1 h;

(3) adding the mixture obtained in the step (2) into a sand mill for grinding for 2-3 times, wherein the particle size D97 of the pigment is less than 5 um;

(4) and (4) adding the mixture obtained in the step (3) into a blending kettle for blending, detecting and packaging.

The sand mill adopts a 5mm zirconium bead sand mill.

The working principle of the invention is that as the colorant is added into the resin at the front section, the pigment particles are wrapped by the resin, and the color fastness to rubbing of the microfiber leather is effectively improved by the same-ratio rear-section dyeing; the invention selects high-physical-property pigment for coloring, and compared with the dye dyed in the later stage, the dye has higher heat resistance, weather resistance and environmental protection performance. The invention tests a large number of different types of pigments and additives, and selects alkali-resistant pigments and additives to solve the problem that the coloring agent achieves alkali resistance.

The invention aims at the problem of storage stability of the aqueous color paste: the higher the pigment content of the color paste, the more difficult the storage stability. According to the invention, through a large number of tests and data analysis, the ratio is finally determined, the acrylic acid modified maleic anhydride dispersing agent is selected and matched with the isomeric alcohol polyoxyethylene ether wetting agent, so that the microfiber colorant can effectively improve the pigment content, enables the pigment to have good dispersibility and color rendering property, and can be produced to have good storage stability.

The microfiber colorant has the beneficial effects that the microfiber colorant can effectively improve the pigment content, enables the pigment to have good dispersibility and color development, and has good storage stability. The invention changes the industry of the microfiber synthetic leather from solvent type to water-based microfiber leather coloring, and simultaneously greatly reduces the generation of waste water and energy consumption.

Drawings

FIG. 1 is a flow chart of a production process of aqueous microfiber leather;

FIG. 2 is a schematic flow chart of a method for preparing the aqueous alkali-deweighting microfiber colorants according to the present invention.

Detailed Description

An embodiment of the present invention is shown in fig. 2.

Example 1

The aqueous black colorant of this example has the following formulation, in mass fraction:

acrylic acid modified maleic anhydride dispersant: 5 percent;

isomeric alcohol polyoxyethylene ether wetting agent: 6 percent;

pure water: 53.7 percent;

defoaming agent: 0.3 percent;

carbon black: 35 percent.

Sequentially putting a dispersing agent, a wetting agent, pure water and a defoaming agent into a stirring kettle, and stirring for 10min at the rotating speed of a dispersion machine of 500 r/min; putting the carbon black into a stirring kettle, and stirring for 1h at the rotating speed of a dispersion machine of 1500 r/min; grinding for 2-3 times with a sand mill until the pigment particle diameter D97 is below 5 um.

Example 2

The aqueous red colorant of this example was formulated as follows, in mass fractions:

acrylic acid modified maleic anhydride dispersant: 3 percent;

isomeric alcohol polyoxyethylene ether wetting agent: 6 percent;

pure water: 50.7 percent;

defoaming agent: 0.3 percent;

pigment red 254: 40 percent.

Sequentially putting a dispersing agent, a wetting agent, pure water and a defoaming agent into a stirring kettle, and stirring for 10min at the rotating speed of a dispersion machine of 500 r/min; putting the pigment red 254 into a stirring kettle, and stirring for 1h at the rotating speed of a dispersion machine of 1500 r/min; grinding for 2-3 times with a sand mill until the pigment particle diameter D97 is below 5 um.

Example 3

The aqueous yellow colorant of this example was formulated as follows in parts by mass:

acrylic acid modified maleic anhydride dispersant: 3 percent;

isomeric alcohol polyoxyethylene ether wetting agent: 6 percent;

pure water: 50.7 percent;

defoaming agent: 0.3 percent;

pigment yellow 83: 40 percent.

Sequentially putting a dispersing agent, a wetting agent, pure water and a defoaming agent into a stirring kettle, and stirring for 10min at the rotating speed of a dispersion machine of 500 r/min; putting pigment yellow 83 into a stirring kettle, and stirring for 1h at the rotating speed of a dispersion machine of 1500 r/min; grinding for 2-3 times with a sand mill until the pigment particle diameter D97 is below 5 um.

Example 4

The aqueous blue colorant of this example was formulated as follows in mass fractions:

acrylic acid modified maleic anhydride dispersant: 5 percent;

isomeric alcohol polyoxyethylene ether wetting agent: 6 percent;

pure water: 50.7 percent;

defoaming agent: 0.3 percent;

phthalocyanine blue 15: 3: 40 percent.

Sequentially putting a dispersing agent, a wetting agent, pure water and a defoaming agent into a stirring kettle, and stirring for 10min at the rotating speed of a dispersion machine of 500 r/min; adding phthalocyanine blue 15: 3, putting the mixture into a stirring kettle, and stirring the mixture for 1 hour at the rotating speed of a dispersion machine of 1500 r/min; grinding for 2-3 times with a sand mill until the pigment particle diameter D97 is below 5 um.

The technical indexes achieved by the embodiment of the invention are as follows:

1. pigment particle size: d975 um or less;

2. environmental protection performance: EU (european union) heavy metals 6 projects: pb + Cd + Hg + Cr + PBB + PBDE <100 PPM;

3. heat resistance: heating at 180 deg.C for 5min to prevent discoloration;

4. weather resistance: QUV ultraviolet aging test for one week to reach grade 7-8;

5. alkali resistance: soaking in 10% sodium hydroxide solution at 85 deg.C for 2 hr, and comparing the color difference with standard gray card, and the color difference is above grade 4.

6. Dry and wet rubbing fastness of microfiber leather: rubbing color fastness instrument, 10N, make 10 round trips, color fading contrast standard gray card, more than grade 4.

7. Storage stability: stored at 60 ℃ for 1 week and has a particle size of D975 um or less.