CN111041891A - Waterproof highlight color-spray coating and preparation method thereof - Google Patents
Waterproof highlight color-spray coating and preparation method thereof Download PDFInfo
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- CN111041891A CN111041891A CN201911394438.1A CN201911394438A CN111041891A CN 111041891 A CN111041891 A CN 111041891A CN 201911394438 A CN201911394438 A CN 201911394438A CN 111041891 A CN111041891 A CN 111041891A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/60—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/385—Oxides, hydroxides or carbonates
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/46—Non-macromolecular organic compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/52—Cellulose; Derivatives thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/58—Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
- D21H23/34—Knife or blade type coaters
Abstract
The invention discloses a waterproof highlight color-spray coating and a preparation method thereof. The coating consists of a closed isocyanate type cross-linking agent, nano-cellulose, an adhesive, a dispersion liquid, a leveling agent and a dissolution promoter. According to the invention, the blocked isocyanate is used as a cross-linking agent in the coating, so that the uniformity and the hydrolytic stability of the coating are improved; the nano-cellulose is introduced, so that the friction resistance and the scratch resistance of the coating are improved, the durability of the coating is improved, the coating is more stable, and the cracking is favorably improved. Finally, the coating has the advantages of good waterproof performance, stability, good scratch resistance and the like.
Description
Technical Field
The invention relates to a waterproof highlight color spray coating and a preparation method thereof, in particular to a waterproof highlight color spray coating containing a closed isocyanate type cross-linking agent and nano-cellulose and a preparation method thereof.
Background
The color spray coating is a good printing ink receiving layer formed by coating a layer of porous pigment with ink absorbability on the surface of color spray paper or a material capable of forming a micropore network in the coating. The coating can absorb ink and prevent ink from penetrating into the bottom layer, control the diffusion thickness of ink particles, separate water-soluble organic dye from water carrier, and keep the dye on the surface layer and not penetrate into base paper or cloth, so that the printed image has high saturation and definition.
Color-jet ink-receptive coatings can be categorized into basically two types: the ink drop absorbing layer is a swelling type ink absorbing layer and a gap type ink absorbing layer, wherein resin is used as a main ink absorbing layer in the swelling type ink absorbing layer, and the coating is slightly swelled after receiving ink drops to form a network to absorb the ink drops. However, this medium has poor water resistance, and the ink absorption is reduced by the crosslinking agent after the water resistance is improved, i.e., the ink absorption and the water resistance are contradictory. The gap type is mainly pigment, and the coating layer contains a network of a large number of gap micropores, so that the gap type has the functions of adsorbing and fixing ink drops. The clearance type coating is divided into an aluminum system and a silicon system, wherein the silicon system clearance type coating has a dull appearance after being used, a later-stage adding process is needed to improve the glossiness, and the aluminum system clearance type coating has high appearance glossiness, good waterproof effect and low cost, but when the aluminum system clearance type coating is applied to the coating on the base materials with strong and clear cloth textures such as canvas, the problems of ink absorption coating breakage, uneven printing and spray painting effect and the like are easy to occur.
Disclosure of Invention
The invention provides a waterproof highlight color-spray coating and a preparation method thereof, wherein a closed polyisocyanate type cross-linking agent and nano-cellulose are introduced to improve the ink absorption and scratch resistance of the coating and keep the appearance glossiness of the coating, so that the color-spray coating with good ink absorption, good water resistance, uniform coating, high glossiness and good scratch resistance is finally obtained.
In order to realize the characteristics, the invention adopts the following technical scheme:
a waterproof highlight color spray coating and a preparation method thereof are characterized by comprising the following components in parts by weight:
0.1-1 part of a cross-linking agent;
0.1-1 part of nano-cellulose;
62-79 parts of a dispersion liquid;
15-20 parts of an adhesive;
0.01-0.1 part of flatting agent;
5-10 parts of a dissolving promoter;
the general structural formula of the blocked isocyanate crosslinking agent is as follows:
wherein R represents aromatic hydrocarbon or aliphatic hydrocarbon, B represents active hydrogen atom compound containing monofunctional group (such as alcohol, amino compound and oxime).
The diameter of the nano-cellulose is 20-50nm, and the length of the nano-cellulose is 1-10 mu m.
The adhesive is one or more of polyvinyl alcohol, styrene-butadiene latex, polyurethane and pure acrylic latex.
The dispersion liquid comprises 35-40 parts of deionized water, 1-2 parts of pH regulator, 1-2 parts of silane coupling agent and 10-15 parts of cosolvent; 15-20 parts of alumina powder.
The pH regulator is one or more of nitric acid, acetic acid and hydrochloric acid.
The cosolvent is one or more of isopropanol, n-butanol, dimethylformamide, propylene glycol monomethyl ether, dipropylene glycol methyl ether and butyl acetate.
The leveling agent is fluorine modified acrylic copolymer.
The cosolvent is butyl acetate.
The invention relates to a waterproof high-gloss color spray coating and a preparation method thereof, wherein the preparation steps of the coating comprise the following specific steps:
(1) preparation of the Dispersion
Under the condition of stirring, adding 15-20 parts of alumina powder, 10-15 parts of cosolvent, 1.0-2.0 parts of pH regulator and 1.0-2.0 parts of silane coupling agent into deionized water, slowly increasing the stirring speed to be more than 2300r/min, and dispersing at high speed for 30-90min to prepare dispersion liquid with solid content of 20-30% and pH of 3-5 for later use.
(2) Aging of the dispersion
And (3) placing the dispersion liquid in a water bath box with the temperature of 65 +/-5 ℃, curing for more than 12 hours, keeping the pH value of the dispersion liquid between 3 and 5, and ensuring that the silane coupling agent is fully hydrolyzed for later use.
(3) Preparation of finished product
Under the conditions of 50 +/-5 ℃ and stirring speed of 300-500r/min, 15-20 parts of adhesive, 0.01-0.1 part of flatting agent (the flatting agent is added into 5-10 parts of dissolution promoter), 0.1-1 part of nano-cellulose and 0.1-1 part of cross-linking agent are slowly added into the cured dispersion liquid, the mixture is stirred for 20-30min, and the mixture is filtered by a 300-mesh filter screen and defoamed for later use.
The blocked polyisocyanate type crosslinking agent consists of a blocked polyisocyanate glycol-based solvent solution. The coating is applied to a color spray coating, the molecular structure of the coating contains a large number of blocked high-activity isocyanate (-NCO) groups, the blocked high-activity isocyanate (-NCO) groups are deblocked after the deblocking temperature of the blocking agent is reached to obtain the-NCO groups and the blocking agent, and the released-NCO groups have strong reactivity on active hydrogen atoms and can further react with hydroxyl compounds to generate more stable chemical bonds. Therefore, the cross-linking agent has good cross-linking effect in a coating system containing active hydrogen atoms, can effectively improve the water resistance and stability of a coating, and the blocked polyisocyanate does not react before the deblocking temperature is reached, so that the cross-linking cannot occur in the coating storage process at normal temperature, the long-time large-scale production is realized, and the operation is quicker and more convenient.
The nano cellulose is Nano Fibrillated Cellulose (NFC), the structure of the nano fibrillated cellulose contains a crystalline area and an amorphous area, the length of fibers exceeds 1 mu m, and the filaments can form a network, adhere to each other and generate connecting bonds, so that the nano fibrillated cellulose has the advantages of high availability, high strength, large specific surface area, large length-diameter ratio, barrier property, dimensional stability, biodegradability, biocompatibility and the like of renewable raw materials. When the nano-silver powder is applied to a color spray coating, cellulose, a cross-linking agent, polyurethane and the like can form a stable network structure, so that the coating is uniform, and the hardness and the scratch resistance of the coating are improved. When the blocked polyisocyanate, the nanocellulose and the prepared solution are mixed, the blocked polyisocyanate and the nanocellulose react with hydroxyl in the solution respectively to form a stable grid structure, and the grid structure further increases the water resistance and hardness of the coating and enables the coating to be more stable.
Innovation and beneficial effects of the invention
As mentioned above, the technical key point of the present invention is to use a blocked polyisocyanate-type cross-linking agent and introduce nanocellulose into the color spray coating. The cellulose, the cross-linking agent, the polyvinyl alcohol and the like form a stable network structure, so that the coating is uniform, the scratch resistance of the coating is improved, and the waterproof performance of the coating is enhanced.
Detailed Description
The invention is further illustrated in detail below with reference to specific examples:
example 1
A waterproof highlight color spray coating and a preparation method thereof are characterized by comprising the following components in parts by weight:
0.3 part of a crosslinking agent;
0.5 part of nano-cellulose;
70 parts of a dispersion liquid;
15 parts of an adhesive;
0.02 part of leveling agent;
5 parts of a dissolving promoter.
The general structural formula of the blocked isocyanate crosslinking agent is as follows:
wherein R represents aromatic hydrocarbon or aliphatic hydrocarbon, B represents active hydrogen atom compound containing monofunctional group (such as alcohol, amino compound and oxime);
the diameter of the nano-cellulose is 20-50nm, and the length of the nano-cellulose is 1-10 mu m;
the adhesive is polyvinyl alcohol;
the dispersion liquid comprises 40 parts of deionized water, 1 part of pH regulator, 1 part of silane coupling agent and 18 parts of cosolvent; 15 parts of alumina powder;
the pH regulator is acetic acid;
the cosolvent is 13 parts of isopropanol;
the flatting agent is fluorine modified acrylic copolymer;
the cosolvent is butyl acetate.
A waterproof high-gloss color spray coating and a preparation method thereof, wherein the preparation steps of the coating comprise the following specific steps:
(1) preparation of the Dispersion
Under the condition of stirring, adding 15 parts of powder, 13 parts of cosolvent, 1 part of pH regulator and 1 part of silane coupling agent into deionized water, slowly increasing the stirring speed to be more than 2300r/min, and dispersing at a high speed for 30-90min to prepare dispersion liquid for later use.
(2) Aging of the dispersion
And (3) placing the dispersion liquid in a water bath box with the temperature of 65 +/-5 ℃, curing for more than 12 hours, keeping the pH value of the dispersion liquid between 3 and 5, and ensuring that the silane coupling agent is fully hydrolyzed for later use.
(3) Preparation of finished product
Under the conditions of 50 +/-5 ℃ and stirring speed of 300-500r/min, 15 parts of adhesive, 0.02 part of flatting agent (the flatting agent is added into 5 parts of vinegar dissolution promoter), 0.5 part of nano-cellulose and 0.3 part of cross-linking agent are slowly added into the cured dispersion liquid, the mixture is stirred for 20-30min, and a 300-mesh filter screen is used for filtering and defoaming for later use.
The coating was carried out on a PET substrate using a screw gap type bar and oven-dried at 70 to 110 ℃ at a coating weight of 30 g/m to give the color spray coating of example 1, the evaluation results of which are shown in Table 1.
Example 2
This embodiment is the same as embodiment 1 except that: in the formula of the waterproof highlight color spray coating, 0.5 part of cross-linking agent and 0.5 part of nano-cellulose are adopted to obtain the color spray coating of the example 2, and the evaluation results are shown in the table 1.
Example 3
This embodiment is the same as embodiment 1 except that: in the formula of the waterproof highlight color spray coating, 0.7 part of cross-linking agent and 0.5 part of nano-cellulose are adopted. The color spray coating of example 3 was obtained and the results of the evaluation are shown in Table 1.
Comparative example 1
This embodiment is the same as embodiment 1 except that: in the formula of the waterproof highlight color spray coating, the cross-linking agent is borax with the solid content of 10 percent, the parts are 1.5 parts, and no nano-cellulose exists. A color spray coating of comparative example 1 was obtained, and the evaluation results are shown in Table 1.
Comparative example 2
This embodiment is the same as embodiment 1 except that: in the formula of the waterproof highlight color spray coating, the cross-linking agent is borax with the solid content of 10%, the parts are 1.5 parts, and the parts are 0.5 part of nano-cellulose. A color spray coating of comparative example 2 was obtained, and the evaluation results are shown in Table 1.
Table 1:
| glossiness (60 degree) | Ink absorption time | Water-proof property | Hardness of | |
| Example 1 | 62 | <3s | Good taste | H |
| Example 2 | 60 | <3s | Good taste | B |
| Example 3 | 61 | <3s | Good taste | H |
| Comparative example 1 | 90 | <5s | Good taste | H |
| Comparative example 2 | 89 | <5s | Good taste | B |
The properties in Table 1 were tested by the following methods:
1. degree of gloss
The gloss of the waterproof high-gloss color spray coatings obtained in the examples and the comparative examples is tested according to the method specified in GB/T8941-2007.
2. Ink absorption time
Printing was performed on the coating using an Epson Photo R330 printer comparing the time required for the ink to completely dry.
3. Water-proof property
The ink jet recording medium was cut into 10cm × 10cm blocks, immersed in water at 25 ℃ for 60 seconds, hung in a 80 ℃ drying cabinet, and after the medium was completely dried, the number of cracks appeared was visually observed. Evaluation was performed according to the following criteria.
4. The surface hardness of the waterproof high-gloss color spray coatings obtained in the examples and the comparative examples is tested according to the method specified in GB/T6739-2006.
The data in the table show that the ink absorption and the hardness of the product are improved, the waterproof performance is basically unchanged, and the waterproof high-gloss color spray coating with a high-gloss surface, quick drying after printing, good waterproof performance and good scratch resistance is obtained.
The embodiments described above are only a part of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (8)
1. A waterproof highlight color spray coating and a preparation method thereof are characterized by comprising the following components in parts by weight:
0.1-1 part of a cross-linking agent;
0.1-1 part of nano-cellulose;
62-79 parts of a dispersion liquid;
15-20 parts of an adhesive;
0.01-0.1 part of flatting agent;
5-10 parts of a dissolving promoter.
2. The waterproof high-gloss color spray coating and the preparation method thereof according to claim 1, wherein the structural general formula of the blocked isocyanate crosslinking agent is as follows:
wherein R represents aromatic hydrocarbon or aliphatic hydrocarbon, B represents active hydrogen atom compound containing monofunctional group (such as alcohol, amino compound and oxime).
3. The waterproof high-gloss color spray coating and the preparation method thereof according to claim 1, wherein the diameter of the nano-cellulose is 20-50nm, and the length is 1-10 μm.
4. The waterproof high-gloss color spray coating and the preparation method thereof according to claim 1, wherein the adhesive is one or more of polyvinyl alcohol, styrene-butadiene latex, polyurethane and pure acrylic latex.
5. The waterproof highlight color spray coating and the preparation method thereof according to claim 1, wherein the dispersion comprises 35-40 parts of deionized water, 1-2 parts of pH regulator, 1-2 parts of silane coupling agent and 10-15 parts of cosolvent; 15-20 parts of alumina powder;
the pH regulator is one or more of nitric acid, acetic acid and hydrochloric acid;
the cosolvent is one or more of isopropanol, n-butanol, dimethylformamide, propylene glycol monomethyl ether and dipropylene glycol methyl ether.
6. The waterproof high-gloss color spray coating and the preparation method thereof according to claim 1, wherein the leveling agent is fluorine-modified acrylic copolymer.
7. The waterproof high-gloss color spray coating and the preparation method thereof as claimed in claim 1, wherein the dissolution promoter is butyl acetate.
8. A waterproof high-gloss color spray coating and a preparation method thereof are characterized in that the preparation steps of the coating comprise the following specific steps:
(1) preparation of the Dispersion
Under the condition of stirring, adding 15-20 parts of alumina powder, 10-15 parts of cosolvent, 1-2 parts of pH regulator and 1-2 parts of silane coupling agent into deionized water, slowly increasing the stirring speed to be more than 2300r/min, and dispersing at high speed for 30-90min to prepare dispersion liquid for later use;
(2) aging of the dispersion
Placing the dispersion liquid in a water bath box at 65 +/-5 ℃, curing for more than 12 hours, keeping the pH value of the dispersion liquid between 3 and 5, and ensuring that the silane coupling agent is fully hydrolyzed for later use;
(3) preparation of finished product
Slowly adding 15-20 parts of adhesive, 0.01-0.1 part of flatting agent (adding the flatting agent into 5-10 parts of dissolution promoter), 0.1-1 part of nano-cellulose and 0.1-1 part of cross-linking agent into the cured dispersion liquid at the temperature of 50 +/-5 ℃ and the stirring speed of 300-500r/min, stirring for 20-30min, filtering by a 300-mesh filter screen, and defoaming for later use;
the general structural formula of the blocked isocyanate crosslinking agent is as follows:
wherein R represents aromatic hydrocarbon or aliphatic hydrocarbon, B represents active hydrogen atom compound containing monofunctional group (such as alcohol, amino compound and oxime).
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| CN115612346A (en) * | 2022-10-08 | 2023-01-17 | 无锡学院 | Environment-friendly water-based stamp-pad ink and preparation method thereof |
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