CN113529441A - Paint printing process with high thermal vacuum fastness - Google Patents
Paint printing process with high thermal vacuum fastness Download PDFInfo
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- CN113529441A CN113529441A CN202110834122.0A CN202110834122A CN113529441A CN 113529441 A CN113529441 A CN 113529441A CN 202110834122 A CN202110834122 A CN 202110834122A CN 113529441 A CN113529441 A CN 113529441A
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/46—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing natural macromolecular substances or derivatives thereof
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/52—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing synthetic macromolecular substances
- D06P1/5207—Macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- D06P1/525—Polymers of unsaturated carboxylic acids or functional derivatives thereof
- D06P1/5257—(Meth)acrylic acid
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/52—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing synthetic macromolecular substances
- D06P1/5264—Macromolecular compounds obtained otherwise than by reactions involving only unsaturated carbon-to-carbon bonds
- D06P1/5285—Polyurethanes; Polyurea; Polyguanides
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/64—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing low-molecular-weight organic compounds without sulfate or sulfonate groups
- D06P1/651—Compounds without nitrogen
- D06P1/65106—Oxygen-containing compounds
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/64—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing low-molecular-weight organic compounds without sulfate or sulfonate groups
- D06P1/651—Compounds without nitrogen
- D06P1/65106—Oxygen-containing compounds
- D06P1/65131—Compounds containing ether or acetal groups
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Coloring (AREA)
Abstract
The invention provides a paint printing process with high thermal vacuum fastness, which comprises the printing treatment of paint printing paste and the padding treatment of aqueous polyurethane emulsion. The pigment printing color paste comprises the following components in percentage by mass: 1 to 10 percent of pigment, 1 to 10 percent of wool fiber powder, 0.5 to 1 percent of silane coupling agent KH-560, 10 to 20 percent of adhesive, 2 to 3 percent of thickening agent, 0.5 to 1 percent of cross-linking agent and the balance of solvent. According to the invention, the wool fiber powder and the coupling agent with special structures are added into the color paste, and a layer of aqueous polyurethane coating film is padded after printing, so that the high thermal vacuum fastness of pigment molecules is obviously improved, and the problems of pigment sublimation and color migration fastness caused by the fact that the pigment molecules are sucked in a thermal vacuum manner under the high-vacuum degree and high-temperature environment of the colored textile are solved.
Description
Technical Field
The invention relates to the technical field of printing and dyeing, in particular to a paint printing process with high thermal vacuum fastness.
Background
Pigment printing is a printing process in which a pigment is adhered to a printed fibrous material by means of the action of a binder in a printing paste. The process is simple, the production flow is short, and particularly, water washing is not needed after pigment printing, so that a large amount of water is saved, the emission of pollutants is reduced, and the method is a clean and environment-friendly production and processing mode and is deeply welcomed by the printing and dyeing industry.
The pigment printing paste generally comprises main components such as a pigment, an adhesive, a thickening agent, other auxiliary agents, water and the like. The pigment is a paste prepared by grinding organic (or inorganic) pigment, corresponding dispersing agent, wetting agent, colloid protective agent, preservative and other auxiliary agents with water. When the pigment is used for printing, the pigment particles in the paint are insoluble in water and conventional organic solvents, so that the paint has no directness to fibers, almost all fiber materials can be printed as long as the adhesive in the printing paste has enough adhesion, the problem caused by printing with different pigments and different pastes can be avoided when the pigment is used for printing, a good solution is provided for printing of various fiber blended products, and the paint printing process is particularly suitable for printing of polyester-cotton blended fabrics.
The particle size of the pigment particles should be controlled between 0.1-1 μm, the uniformity of the particles is good, and the particle size of individual coarse particles should not exceed 2 μm. The pigment particles should have good thermal, chemical and dispersion stability. Because the pigment particles are formed by piling up pigment crystals, and pigment crystals and pigment molecules forming the pigment crystals are combined together mainly by means of intermolecular force, the intermolecular force is weak, and the pigment particles can escape from the mutual constraint action among the molecules under certain energy conditions. With the continuous development of science and technology, the service environment of colored textiles is gradually enriched, for example, in a high-heat environment, when pigment printing fabrics are heated, pigment molecules printed on the fabrics absorb heat, the binding effect of the acting force among the pigment molecules is removed, so that the sublimation phenomenon is generated, and the phenomenon of staining and color mixing of the pigment on the fabrics due to thermal sublimation is caused. Patent CN107841891A discloses a color paste preparation method for improving the dye-sublimation fastness of textile pigment printing, which is characterized in that the heat-sublimation fastness of the textile pigment printing is improved by adding high-heat-resistance dyed protein powder into the color paste to reduce the proportion of easily-regenerated paint. However, the prior art still lacks in the research on the stability of the printing paste in the vacuum environment, and the technical scheme special for improving the heat-resistant vacuum fastness of the colored textile basically falls into the blank, and the heat-resistant vacuum environment is more severe than the high-heat environment, so that the requirement on the stability of the paste is higher.
In view of the above, there is a need to design an improved high thermal vacuum fastness paint printing process to solve the above problems.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a paint printing process with high thermal vacuum fastness, which is characterized in that wool fiber powder and a coupling agent with special structures are added into color paste, and a layer of waterborne polyurethane coating film is padded after printing, so that the high thermal vacuum fastness of pigment molecules is obviously improved, and the problems of pigment sublimation and color migration fastness caused by the fact that the pigment molecules are sucked in a thermal vacuum manner under the conditions of high vacuum degree and high temperature of a colored textile are solved.
In order to realize the aim, the invention provides a paint printing process with high thermal vacuum fastness, which comprises the steps of printing treatment of paint printing paste and padding treatment of aqueous polyurethane emulsion; the pigment printing paste comprises the following components in percentage by mass: 1 to 10 percent of pigment, 1 to 10 percent of wool fiber powder, 0.5 to 1 percent of silane coupling agent KH-560, 10 to 20 percent of adhesive, 2 to 3 percent of thickening agent, 0.5 to 1 percent of cross-linking agent and the balance of solvent.
As a further improvement of the invention, the wool fiber powder is a semi-fine wool fiber powder containing a discontinuous medullary layer inside.
As a further improvement of the invention, the particle size of the wool fiber powder is 30-40 μm.
As a further improvement of the invention, the wool fiber powder is treated by the following steps: and (3) soaking the wool fiber powder for 10 to 30 minutes by adopting ammonia water with the concentration of 2 to 8 percent, and activating the wool fiber powder.
As a further improvement of the invention, the addition amount of the wool fiber powder is equal to that of the pigment.
As a further improvement of the invention, the particle size of the aqueous polyurethane emulsion is 200-500 nm.
As a further improvement of the present invention, the adhesive is an acrylic copolymer, the crosslinking agent is a copolymer of isocyanate and acrylate, and the thickener is an acrylic thickener; the solvent is distilled water.
As a further improvement of the invention, the preparation method of the pigment printing paste comprises the following steps:
s1, adding the 1-10% of pigment, 1-10% of wool fiber powder and 0.5-1% of silane coupling agent into the solvent, and stirring and mixing uniformly;
and S2, adding the 10-20% of adhesive, 2-3% of thickening agent and 0.5-1% of cross-linking agent into the mixture, and uniformly stirring to obtain the pigment printing paste.
As a further improvement of the invention, in step S1, the stirring speed is 600-800 r/min, and the time is 20-30 min.
As a further improvement of the invention, in step S2, the stirring speed is 600-800 r/min, and the time is 20-40 min.
The invention has the beneficial effects that:
1. according to the paint printing process with high thermal vacuum fastness, the wool fiber powder with a special structure and the coupling agent are added into the color paste, and after printing, a layer of water-based polyurethane coating film is padded, so that the high thermal vacuum fastness of pigment molecules is obviously improved. Wherein, the silane coupling agent KH-560 is used to improve the dispersibility and the bonding fastness of the pigment molecules and the wool fiber powder; by utilizing the protein molecular structure and a proper amount of medullary layer structure of the wool fiber powder, the pigment molecules can be effectively immobilized, so that the pigment molecules are not easy to extrude and migrate by negative pressure in a thermal vacuum environment; the water-based polyurethane, the wool fiber powder in the printing paste and the KH-560 are utilized to generate a hydrogen bond effect, so that the pigment in the printing paste is well blocked and protected, the heat-resistant vacuum fastness of pigment molecules is remarkably improved, the blank of research on the heat-resistant vacuum paste in the prior art is filled, and the problems of pigment sublimation and color migration fastness caused by heat vacuum suction of the pigment molecules of the colored textile under the conditions of high vacuum degree and high temperature environment are solved.
2. According to the paint printing process with high thermal vacuum fastness, wool fiber powder with the grain diameter of 30-40 mu m subjected to ammonia water activation treatment is preferably selected, the wool fiber powder is slightly dissolved under the action of ammonia water, and more reactive groups can be displayed, so that the specific surface area and the surface activity of the wool fiber powder are improved, the immobilization of the wool fiber powder on pigment particles is further promoted, pigment molecules can be sufficiently immobilized on the wool fiber powder and are not easy to migrate out, the uniformity and the stability of color paste can be ensured, and the thermal vacuum fastness of the printing color paste is remarkably improved.
3. According to the paint printing process with high thermal vacuum fastness, the pigment, the wool fiber powder and the silane coupling agent are mixed to form a uniform dispersion, the special composition and structure of the wool fiber powder enable pigment molecules to form a stable mixed dyeing structure with the pigment molecules, and then the adhesive, the thickening agent and the crosslinking agent are added, so that uniform and stable color paste is formed, the printing performance is improved, and the thermal vacuum fastness grade of the printing color paste is further improved. The preparation method of the color paste is simple and easy to operate, has high repeatability, is convenient to popularize and apply, and has remarkable economic benefit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail below with reference to specific embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme of the present invention are shown in the specific embodiments, and other details not closely related to the present invention are omitted.
In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a paint printing process with high thermal vacuum fastness, which comprises the printing treatment of paint printing paste and the padding treatment of aqueous polyurethane emulsion. The pigment printing color paste comprises the following components in percentage by mass: 1 to 10 percent of pigment, 1 to 10 percent of wool fiber powder, 0.5 to 1 percent of silane coupling agent KH-560 (gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane), 10 to 20 percent of adhesive, 2 to 3 percent of thickening agent, 0.5 to 1 percent of cross-linking agent and the balance of solvent.
By adding the wool fiber powder with a special structure and the coupling agent into the color paste and padding a layer of aqueous polyurethane coating film after printing, the aqueous polyurethane can generate hydrogen bond with the wool fiber powder and KH-560 in the printing color paste, so that the pigment in the printing color paste is well blocked and protected, and the heat-resistant vacuum fastness of pigment molecules is remarkably improved.
The wool fiber powder is preferably a semi-fine wool fiber powder containing a discontinuous pith layer inside. The research result of the invention shows that the wool fiber powder with the structure is more beneficial to the immobilization of pigment molecules, the pigment molecules are not easy to extrude and migrate under negative pressure in a thermal vacuum environment, and the stability is high. The reason is probably that the medullary layer of the semi-fine wool fiber powder containing the discontinuous medullary layer is a cavity with medullary hair and consists of loose and irregularly-shaped keratin cells, so that pigment molecules are conveniently immobilized, the wool fiber powder is cut into powder with micron-sized length from wool fibers, and the cut two-end fracture is also favorable for the permeation and immobilization of the pigment molecules, so that the vacuum resistance and the high-temperature resistance of the powder are improved.
The particle size of the wool fiber powder is 30-40 mu m. The pigment has a particle size of 0.1 to 1 μm. The wool powder is formed by mechanically cutting and grinding wool fibers, the particle size of the wool powder is determined by the length and the fineness of the wool fiber, and the length and the fineness of the wool powder are both about 30-40 mu m. The length of the wool fiber powder also has an important influence on the heat-resistant vacuum fastness of the color paste, when the length is too small, the processing difficulty is high, the production cost is increased, and when the length is too small, pigment molecules immobilized in the wool fiber powder are easy to migrate out from ports at two ends, so that the heat-resistant vacuum fastness of the wool fiber powder is reduced; the longer length may result in the decrease of rubbing fastness of the subsequent pigment printed fabric, and the reduction of exposed fracture, the decrease of permeation rate and permeation amount of pigment molecules to the pith layer, and the decrease of heat-resistant vacuum fastness.
The wool fiber powder is preferably treated as follows: and (3) soaking the wool fiber powder for 10-30 minutes by adopting ammonia water with the concentration of 2-8 wt%, and activating the wool fiber powder. The wool fiber powder generates slight dissolution under the action of ammonia water, and can show more reactive groups, so that the specific surface area and the surface activity of the wool fiber powder are improved, the immobilization of the wool fiber powder on pigment particles is promoted, and the heat-resistant vacuum fastness is improved.
Preferably, the addition amount of the wool fiber powder is equal to that of the pigment. So set up, can the maximize with pigment particle solid carry in wool fiber powder to can guarantee the degree of consistency of mill base. As the particle size of the wool fiber powder is larger, when the addition amount of the wool fiber powder is too much, the color rendering property of the color paste can be reduced.
By adding the silane coupling agent of KH-560, the dispersibility and the bonding fastness of the pigment molecules and the wool fiber powder can be improved. The research of the invention shows that the KH-560 has better effect than other coupling agents, which is probably due to the fact that the epoxy group structure is easy to react, simple in structure, small in molecule and easy to hydrolyze. The heat-resistant vacuum fastness result is half grade higher than that of KH-550 (gamma-aminopropyl triethoxysilane) and KH-570 (gamma-methacryloxypropyl trimethoxysilane).
The binder is binder UDT (acrylic copolymer), the crosslinker is crosslinker AF6900 (copolymer of isocyanate and acrylate), and the thickener is an acrylic thickener, such as PTF paste. The solvent is distilled water.
The particle size of the waterborne polyurethane emulsion is 200-500 nm.
The preparation method of the pigment printing paste comprises the following steps:
s1, adding the 1-10% of pigment, 1-10% of wool fiber powder and 0.5-1% of silane coupling agent into the solvent, and stirring and mixing uniformly;
and S2, adding the 10-20% of adhesive, 2-3% of thickening agent and 0.5-1% of cross-linking agent into the mixture, and uniformly stirring to obtain the pigment printing paste.
In step S1, the stirring speed is 600-800 r/min, and the time is 20-30 min.
In step S2, the stirring speed is 600-800 r/min, and the time is 20-40 min.
By adopting the technical scheme, the pigment, the wool fiber powder and the silane coupling agent are mixed to form uniform dispersion, the special composition and structure of the wool fiber powder enable pigment molecules to form a stable mixed dyeing structure with the pigment molecules, and then the additive, the thickening agent and the crosslinking agent are added. The pigment printing paste can be firmly adhered to the surface of a textile, pigment molecules are not easy to sublimate or migrate under a thermal vacuum environment, and the problems of pigment sublimation and color migration fastness caused by the fact that the pigment molecules are sucked in the thermal vacuum mode under the high-vacuum degree and high-temperature environment conditions of the colored textile are solved.
Examples 1 to 3 and comparative examples 4 to 6
A paint printing process with high thermal vacuum fastness comprises printing treatment of paint printing paste and padding treatment of waterborne polyurethane emulsion (particle size is 200-500 nm), namely, blending printing is carried out on polyester-cotton fabric by the prepared paint printing paste, then a layer of waterborne polyurethane coating film is padded, and then curing and drying are carried out. The pigment printing color paste comprises the following components in percentage by mass:
1-10% of pigment;
1-10% of wool fiber powder; the particle size of the wool fiber powder is 35 μm (including discontinuous medullary layer);
2-3% of PTF paste;
0.5-1% of a coupling agent KH-560;
10-20% of binder UDT;
0.5-1% of a cross-linking agent AF 6900;
the balance of distilled water.
The configuration method comprises the following steps: s1, adding 1-10% of pigment, 1-10% of wool fiber powder and 0.5-1% of silane coupling agent into distilled water, and stirring at the speed of 600-800 r/min for 20-30 min;
and S2, then adding 10-20% of adhesive, 2-3% of thickening agent and 0.5-1% of cross-linking agent, and stirring at the speed of 600-800 r/min for 20-40 min to obtain the pigment printing paste.
The printed fabric is processed under the vacuum degree of 7 multiplied by 10-3And (4) carrying out continuous heat treatment at the temperature of 150 ℃ for 30h under Pa, and then carrying out thermal vacuum fastness grade grading according to a grading gray card. Rating standard: GB/T250-.
TABLE 1 color paste formulations and vacuum fastness to heat grades for examples 1-3 and comparative examples 4-6
As can be seen from Table 1, the vacuum heat fastness rating was reduced when no wool fiber powder and KH-560 were added, and the vacuum heat fastness rating was also reduced to a different extent when wool fiber powder or KH-560 was added alone. Therefore, the invention solves the problems of pigment sublimation and color migration fastness caused by the heat vacuum suction of pigment molecules of colored textiles under the conditions of high vacuum degree and high temperature by simultaneously adding the wool fiber powder with a special structure and the coupling agent into the color paste.
Example 4
Compared with the example 2, the difference of the printing process of the paint with high thermal vacuum fastness is that wool fiber powder is soaked in 5 percent ammonia water for 20 minutes. The rest is substantially the same as embodiment 2, and will not be described herein.
Comparative examples 4 to 5
Compared with example 2, the difference of the printing process of the paint with high thermal vacuum fastness is that the adopted coupling agents are KH-550 and KH-570 respectively. The rest is substantially the same as embodiment 2, and will not be described herein.
Comparative example 6
Compared with the example 2, the difference of the printing process of the paint with high thermal vacuum fastness is that the padding treatment process of the water-based polyurethane emulsion is not carried out. The rest is substantially the same as embodiment 2, and will not be described herein.
TABLE 2 vacuum fastness to Heat ratings for examples 2, 4 and comparative examples 4-6
| Test examples | Heat vacuum fastness/grade |
| Example 2 | 4-5 |
| Example 4 | 5 |
| Comparative example 4 | 4 |
| Comparative example 5 | 4 |
| Comparative example 6 | 4 |
From table 2, it can be seen that after the wool fiber powder is immersed in 5% ammonia water for 20 minutes, the thermal vacuum fastness level is further improved, which indicates that the wool fiber powder generates slight dissolution under the action of the ammonia water, can exhibit more reactive groups, and improves the specific surface area and the surface activity of the wool fiber powder, thereby promoting the solid loading of the wool fiber powder to the pigment particles, and further improving the thermal vacuum fastness. When KH-550 and KH-570 are selected, the thermal vacuum fastness grade is slightly reduced, which shows that KH-560 epoxy groups are more favorable for improving the solid-carrying effect of the wool fiber powder on pigment particles. When the padding treatment of the waterborne polyurethane emulsion is not carried out, the thermal vacuum fastness level is also reduced, which shows that the invention plays a good role in blocking and protecting the pigment in the printing paste by padding a layer of waterborne polyurethane coating film, and obviously improves the thermal vacuum fastness of the pigment molecules.
In conclusion, the paint printing process with high thermal vacuum fastness utilizes the silane coupling agent KH-560 to improve the dispersibility and the bonding fastness of the pigment molecules and the wool fiber powder; the protein molecular structure and a proper amount of medullary layer structure of the wool fiber powder are utilized to effectively immobilize pigment molecules; in addition, the wool fiber powder is activated by ammonia water to generate slight dissolution and show more reactive groups, so that the specific surface area and the surface activity of the wool fiber powder are improved, the immobilization of the wool fiber powder on pigment particles is promoted, and pigment molecules are not easy to extrude and migrate by negative pressure in a thermal vacuum environment; the water-based polyurethane, the wool fiber powder in the printing paste and KH-560 are utilized to generate hydrogen bond effect, thereby playing a good role in blocking and protecting the pigment in the printing paste, and finally obviously improving the heat-resistant vacuum fastness of the pigment molecules.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (10)
1. A paint printing process with high thermal vacuum fastness is characterized by comprising the printing treatment of paint printing paste and the padding treatment of aqueous polyurethane emulsion; the pigment printing paste comprises the following components in percentage by mass: 1 to 10 percent of pigment, 1 to 10 percent of wool fiber powder, 0.5 to 1 percent of silane coupling agent KH-560, 10 to 20 percent of adhesive, 2 to 3 percent of thickening agent, 0.5 to 1 percent of cross-linking agent and the balance of solvent.
2. The high hot vacuum fastness paint printing process according to claim 1, wherein the wool fiber powder is semi-fine wool fiber powder containing discontinuous pith layer inside.
3. The paint printing process with high thermal vacuum fastness according to claim 2, characterized in that the particle size of the wool fiber powder is 10-40 μm.
4. The paint printing process with high thermal vacuum fastness according to claim 2, characterized in that the wool fiber powder is treated by the following steps: and (3) soaking the wool fiber powder for 10 to 30 minutes by adopting ammonia water with the concentration of 2 to 8 percent, and activating the wool fiber powder.
5. The high-heat-vacuum-fastness paint printing process according to claim 1, wherein the addition amount of the wool fiber powder is equal to that of the pigment.
6. The paint printing process with high thermal vacuum fastness according to claim 1, characterized in that the particle size of the aqueous polyurethane emulsion is 200-500 nm.
7. The high hot vacuum fastness paint printing process according to claim 1, wherein the binder is an acrylic acid copolymer, the cross-linking agent is a copolymer of isocyanate and acrylate, and the thickener is an acrylic thickener; the solvent is distilled water.
8. The process for printing the paint with high thermal vacuum fastness according to claim 1, wherein the preparation method of the paint printing paste comprises the following steps:
s1, adding the 1-10% of pigment, 1-10% of wool fiber powder and 0.5-1% of silane coupling agent into the solvent, and stirring and mixing uniformly;
and S2, adding the 10-20% of adhesive, 2-3% of thickening agent and 0.5-1% of cross-linking agent into the mixture, and uniformly stirring to obtain the pigment printing paste.
9. The printing process of the high-heat-vacuum-fastness paint is characterized in that in the step S1, the stirring speed is 600-800 r/min, and the stirring time is 20-30 min.
10. The printing process of the high-heat-vacuum-fastness paint is characterized in that in the step S2, the stirring speed is 600-800 r/min, and the time is 20-40 min.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115785770A (en) * | 2022-11-25 | 2023-03-14 | 武汉纺织大学 | Paint doped with wool powder and preparation method thereof |
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| CN113529441B (en) | 2022-05-27 |
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