CN109629341B - Sun-proof antibacterial thermosensitive paper and preparation method thereof - Google Patents
Sun-proof antibacterial thermosensitive paper and preparation method thereof Download PDFInfo
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- CN109629341B CN109629341B CN201910069534.2A CN201910069534A CN109629341B CN 109629341 B CN109629341 B CN 109629341B CN 201910069534 A CN201910069534 A CN 201910069534A CN 109629341 B CN109629341 B CN 109629341B
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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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
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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
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/385—Oxides, hydroxides or carbonates
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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
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
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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
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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
- D21H19/58—Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
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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
- 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
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Abstract
The invention discloses sun-proof bacteriostatic heat-sensitive paper which is characterized by comprising a raw paper layer, a heat-sensitive color-changing layer and a protective layer, wherein the heat-sensitive color-changing layer is clamped between the raw paper layer and the protective layer, and sun-proof bacteriostatic layers are arranged on the front surface and the back surface of the raw paper layer; the sun-proof antibacterial layer is prepared from the following raw materials, by weight, 80-100 parts of acrylate adhesives, 30-40 parts of nano inorganic fillers, 50-60 parts of organic solvents, 5-8 parts of sun-screening agents, 1-5 parts of aloe extract, 1-5 parts of antioxidants and 1-3 parts of beewax; the solvent is selected from organic solvent capable of dissolving beeswax. The heat-sensitive paper has the advantages of good sun resistance, lasting color after color development, excellent antibacterial activity and wide applicability. The invention also correspondingly discloses a preparation method of the thermal sensitive paper.
Description
Technical Field
The invention relates to the technical field of thermal sensitive paper and preparation thereof, in particular to sun-proof antibacterial thermal sensitive paper and a preparation method thereof.
Background
Thermal paper is also called thermal facsimile paper, thermal recording paper, thermal transfer paper, and thermal transfer paper in taiwan. Thermal paper is a processed paper, and is produced by coating a layer of "thermal coating" (thermal discoloration layer) on a high-quality base paper, and then developing the "thermal coating" by thermal printing to form characters or patterns.
In the prior art, the publication number of authorization is CN203487413U, which discloses a thermal paper, comprising base paper and a thermal coating coated on the front surface of the base paper, wherein the back surface of the base paper is evenly cast with a coating layer, so that the thermal paper can be printed in a positive and negative way.
However, the thermal paper has a general problem of most thermal printing papers: the color durability is poor. The problems of unclear color development or fading are easily caused no matter the thermal paper is exposed to the sun during storage and transportation or after printing and color development, so that the use of the thermal paper is limited. On the other hand, the thermal paper is a plant fiber product, and is often used for paper with strong circulation such as supermarket receipt printing, ticket printing and the like, and the thermal paper after being wetted is easy to become a hotbed for bacterial growth and is extremely easy to become a medium for bacterial propagation in the using process. Therefore, for some heat-sensitive papers used in public places such as supermarket receipt printing, bus ticket printing and the like, certain bacteria breeding prevention function is required to be achieved, so that the breeding of bacteria in the storage and use processes is reduced.
Aiming at the problems, the invention aims to provide the sun-proof bacteriostatic heat-sensitive paper and the preparation method thereof.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the light-fast bacteriostatic heat-sensitive paper which has the advantages of good light-fast property, lasting color after color development, excellent bacteriostatic property and wide applicability.
In order to achieve the purpose, the invention provides the following technical scheme:
a sun-proof bacteriostatic thermosensitive paper comprises a raw paper layer, a thermosensitive color-changing layer and a protective layer, wherein the thermosensitive color-changing layer is clamped and embedded between the raw paper layer and the protective layer, and sun-proof bacteriostatic layers are arranged on the front surface and the back surface of the raw paper layer; the sun-proof antibacterial layer is prepared from the following raw materials in parts by weight,
80-100 parts of acrylate adhesive
30-40 parts of nano inorganic filler
50-60 parts of organic solvent
5-8 parts of sun-screening agent
1-5 parts of aloe extract
1-5 parts of antioxidant
1-3 parts of beeswax;
the solvent is selected from organic solvent capable of dissolving beeswax.
Through adopting above-mentioned technical scheme, set up the lightfast antibacterial layer through the raw paper layer of temperature-sensitive paper just anti-both sides and greatly promoted temperature-sensitive paper's lightfast stability and antibacterial nature for temperature-sensitive paper is difficult for causing the color development after printing unclear or fade because of the solarization in storage, transportation, is difficult for breeding the bacterium in storage or use simultaneously, is applicable to as the paper products that have extensive circulation nature such as bus ticket printing paper, supermarket receipt printing paper. The sun-proof and bacteriostatic functions of the thermal sensitive paper are mainly derived from the sun-proof and bacteriostatic layer: 1. the appropriate nano inorganic filler has high adhesion fastness on the raw paper layer and good light resistance; 2. the aloe extract contains natural sun-proof components, is beneficial to keeping the heat-sensitive paint in the heat-sensitive paper from being influenced by sunlight and keeping long-term stability, and meanwhile, the natural aloe extract also contains sterilization and inflammation-diminishing components, so that the aloe extract has an inhibiting effect on the breeding of bacteria; 3. the sunscreen agent and the antioxidant have the effects of protecting the aloe extract from being damaged in the preparation process of the thermal sensitive paper on one hand, and can synergistically play the roles of resisting sunlight and improving the sunlight stability of the thermal sensitive paper together with the aloe extract on the other hand; 4. the beeswax of above-mentioned mixing amount can reduce the loss of preparation heat-sensitive paper in-process aloe extract, sun-proof agent, antioxidant, and on the other hand can promote the waterproof nature of base paper layer, still contains natural antibacterial component in the beeswax in addition, does benefit to the antibacterial ability who promotes heat-sensitive paper. Although the sun-proof antibacterial layer is positioned between the thermosensitive discoloring layer and the raw paper layer, the thermosensitive discoloring layer and the sun-proof antibacterial layer are thin, so that mutual solubility exists to a certain degree after preparation, and effective components extracted from the sun-proof agent, the antioxidant and the aloe are diffused to the thermosensitive discoloring layer to a certain degree, so that the sun-proof and antibacterial effects of the sun-proof antibacterial layer are not hindered.
Further, the nano inorganic filler is formed by mixing nano silicon dioxide, nano zinc oxide and nano titanium dioxide according to the mass ratio of 1:0.5: 0.5.
By adopting the technical scheme, the nano silicon dioxide, the nano zinc oxide and the nano titanium dioxide have good sunlight resistance, and have excellent adhesion fastness on the surface of the raw paper layer. In addition, the high adsorbability of the nano silicon dioxide can enable aloe extract, the sun-proof agent and antioxidant molecules to be adsorbed, so that the aloe extract, the sun-proof agent and the antioxidant molecules are slowly released, and the thermosensitive paper has long-time sun-proof and bacteriostatic properties.
Further, the organic solvent is acetone.
By adopting the technical scheme, the acetone has good dissolubility to the beeswax and is easy to remove.
Further, the sun-screening agent is bis-ethylhexyloxyphenol methoxyphenyl triazine.
By adopting the technical scheme, the bisethylhexyloxyphenol methoxyphenyl triazine has high heat resistance and extremely strong ultraviolet absorption capacity, and can effectively improve the sun-proof performance of the thermal sensitive paper, so that the thermal sensitive paper is not easy to have the problems of unclear color development or fading caused by sunshine.
Further, the antioxidant is antioxidant BHT.
By adopting the technical scheme, the antioxidant BHT is a safe antioxidant for food processing, can effectively play a role in delaying the oxidative aging of other substances, and increases the tolerance of the thermal sensitive paper to external heat sources and sunlight.
The invention also aims to provide a preparation method of the light-fast bacteriostatic heat-sensitive paper, and the heat-sensitive paper prepared by the method has the advantages of good light-fast property, durable color after color development, excellent bacteriostatic property and wide applicability.
In order to achieve the purpose, the invention provides the following technical scheme:
a preparation method of the sun-proof bacteriostatic heat-sensitive paper is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
pre-dissolving beeswax: weighing beeswax and an organic solvent according to a certain proportion, mixing, and stirring until the beeswax is completely dissolved to obtain a beeswax solution;
preparing a sun-proof antibacterial material: weighing the aloe extract, the antioxidant and the nano inorganic filler according to the proportion, and stirring and mixing uniformly; sequentially adding the prepared beeswax solution and the sun-proof agent in sequence, and continuously stirring until the mixture is uniformly mixed to obtain a mixture;
and (3) solvent removal: removing the solvent in the mixture by adopting a reduced pressure evaporation method, grinding and sieving to obtain the sun-proof antibacterial material for later use;
coating a sun-proof antibacterial layer: mixing the sun-proof antibacterial material and the acrylate adhesive weighed in proportion, uniformly stirring, and uniformly coating on the front and back surfaces of the raw paper layer to form a sun-proof antibacterial layer;
coating a thermosensitive coating layer: uniformly coating a thermosensitive coating on the surface of the raw paper layer coated with the sun-proof antibacterial layer to form a thermosensitive color-changing layer;
and (3) arranging a protective layer: and (4) pressing and covering a polyester film layer on the surface of the thermosensitive color-changing layer after the thermosensitive paint is coated.
By adopting the technical scheme, beeswax can be beeswax powder, and the beeswax powder is insoluble in water, so that the beeswax powder needs to be dissolved by an organic solvent in advance; the preparation of the sun-proof antibacterial material is completed in a high-speed mixer, the nano inorganic filler, the aloe extract and the antioxidant are added firstly, and the mixture is fully mixed, so that the nano inorganic filler can uniformly adsorb the aloe extract and the antioxidant, and the damage of the sun-proof antibacterial active ingredients in the aloe extract can be reduced due to the addition of the antioxidant in the process; then, continuously adding the beeswax solution and the sun-proof agent and continuously mixing to ensure that the nano inorganic filler can uniformly adsorb the beeswax solution and the sun-proof agent to obtain a mixture; before the mixture is used, the organic solvent needs to be removed, grinding and sieving are carried out, so that the obtained sun-proof antibacterial material is fine and uniform in particles, is beneficial to uniform dispersion in subsequent steps, and is firmly attached to the surface of the raw paper layer; the acrylate adhesive has water solubility, so that the nano inorganic filler is easily and uniformly dispersed, and can be firmly attached to the raw paper layer after being coated to form a sun-proof antibacterial layer; and finally, coating the heat-sensitive coating on the light-fast bacteriostatic layer by adopting a conventional heat-sensitive paper preparation process to form a heat-sensitive discoloring layer, and then laminating a protective layer on the heat-sensitive discoloring layer to obtain the heat-sensitive paper with the light-fast bacteriostatic property.
Further, the preparation steps of the sun-proof antibacterial material are completed in a high-speed mixer, and the rotating speed is controlled to be 3000-5000rpm in the mixing process.
By adopting the technical scheme, the material mixing time can be shortened to the greatest extent, so that the components are fully and uniformly mixed.
Further, the aloe extract is prepared by the following process,
step one, peeling aloe, mashing, adding 1.0-3.0mol/L sodium carbonate solution with the same volume, and uniformly stirring to obtain a mixture;
step two: placing the mixture obtained in the step one at the temperature of 28-35 ℃ for heat preservation and extraction for 30-45min, and filtering to obtain an extract liquid after the heat preservation is finished;
step three: adding activated carbon powder 1-5wt% of the extract into the extract obtained in the second step, performing ultrasonic treatment for 10-15min, and filtering to obtain aloe extract for later use.
By adopting the technical scheme, the activity of the sun-proof and bacteriostatic components in the aloe extract prepared by the process can be retained to the greatest extent, and meanwhile, the plant pigment and solid impurities are reduced after the aloe extract is treated by the activated carbon, so that the prepared aloe extract is pure, and the color of paper or the formation of defects cannot be influenced. The aloe extract may also be suitably concentrated as required to reduce the moisture content of the extract.
In conclusion, the invention has the following beneficial effects:
the sun-proof antibacterial layers are arranged on the front surface and the back surface of the raw paper layer of the thermal sensitive paper, so that the sun-proof stability and the antibacterial property of the thermal sensitive paper are greatly improved, the thermal sensitive paper is not easy to develop color or fade after being printed due to sunlight in the processes of storage and transportation, bacteria are not easy to breed in the processes of storage or use, and the paper is suitable for being used as paper products with wide circulation, such as automobile ticket printing paper, supermarket receipt printing paper and the like.
Drawings
FIG. 1 is a flow chart of a preparation process of the sun-proof bacteriostatic heat-sensitive paper in the embodiment;
FIG. 2 is a flow chart of the process for preparing the aloe vera extract in the example.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1:
the utility model provides a resistant antibacterial heat-sensitive paper that shines, its is including protective layer, temperature sensing discoloration layer, the resistant layer of restraining the fungus of shining, raw paper layer, the resistant layer of restraining the fungus of shining, temperature sensing discoloration layer and protective layer that the laminating set gradually, and its both sides all can be printed. The protective layer is a polyester film layer, and the thermosensitive color-changing layer is formed by coating thermosensitive paint by adopting a conventional coating process. In order to improve the storage stability of the thermal sensitive paper, the sun resistance and the antibacterial performance after color development, the sun-resistant antibacterial layer which is clamped and embedded between the thermal sensitive color-changing layer and the raw paper layer is formed by coating the raw materials according to the following proportion: 800g of acrylate adhesive, 150g of nano silicon dioxide, 75g of nano zinc oxide, 75g of nano titanium dioxide, 500g of acetone, 50g of bis (ethylhexyloxyphenol) methoxyphenyl triazine, 10g of aloe extract, 10g of antioxidant BHT (butylated hydroxytoluene), and 10g of beeswax.
As shown in fig. 1, the specific thermal paper preparation process includes the following steps,
pre-dissolving beeswax: mixing the beeswax and acetone according to the proportion, and stirring until the beeswax is completely dissolved to obtain a beeswax solution; in order to accelerate the dissolution of beeswax, beeswax may be ground to a powder state beforehand.
Preparing a sun-proof antibacterial material: weighing the aloe extract, the antioxidant BHT, the nano silicon dioxide, the nano zinc oxide and the nano titanium dioxide according to the proportion, adding into a high-speed mixer, and stirring and mixing uniformly at the rotating speed of 3000 rpm; then sequentially adding the prepared beeswax solution and the bis (ethylhexyloxyphenol methoxyphenyl) triazine, and continuously stirring until the mixture is uniformly mixed to obtain a mixture;
wherein the aloe extractive solution is prepared by the process shown in figure 2,
step one, peeling aloe, mashing, adding 1.0mol/L sodium carbonate solution with the same volume, and uniformly stirring to obtain a mixture;
step two: placing the mixture obtained in the step one at 28 ℃ for heat preservation and extraction for 45min, and filtering to obtain an extract liquid after the heat preservation is finished;
step three: adding activated carbon powder accounting for 1wt% of the extract into the extract obtained in the second step, performing ultrasonic treatment for 10min, and filtering to obtain aloe extract for later use.
And (3) solvent removal: removing acetone in the mixture by adopting a reduced pressure evaporation method, grinding, and sieving with a 400-mesh sieve to obtain the sun-proof antibacterial material for later use.
Coating a sun-proof antibacterial layer: and mixing the sun-proof antibacterial material and the acrylate adhesive weighed according to the proportion, uniformly stirring, uniformly coating the mixture on the front side and the back side of the raw paper layer, and curing the acrylate adhesive to form the sun-proof antibacterial layer.
Coating a thermosensitive coating layer: uniformly coating a thermosensitive coating on the surface of the raw paper layer coated with the sun-proof antibacterial layer to form a thermosensitive color-changing layer; the processing method of the thermosensitive color-changing layer adopts the conventional thermosensitive paint coating process to coat and process.
And (3) arranging a protective layer: and after finishing coating the thermosensitive paint, laminating a polyester film layer on the surface of the thermosensitive color-changing layer to obtain the sun-proof antibacterial thermosensitive paper.
Example 2:
the utility model provides a resistant antibacterial thermal sensitive paper that shines, its is including the protective layer, the thermochromic layer, the resistant antibacterial layer that shines, the raw paper layer, the resistant antibacterial layer that shines, thermochromic layer and protective layer that laminate setting in proper order, and two sides all can be printed. The protective layer is a polyester film layer, and the thermosensitive color-changing layer is formed by coating thermosensitive paint by adopting a conventional coating process. In order to improve the storage stability of the thermal sensitive paper, the sun resistance and the antibacterial performance after color development, the sun-resistant antibacterial layer which is clamped and embedded between the thermal sensitive color-changing layer and the raw paper layer is formed by coating the raw materials according to the following proportion: 850g of acrylate adhesive, 160g of nano silicon dioxide, 80g of nano zinc oxide, 80g of nano titanium dioxide, 520g of acetone, 55g of bis (ethylhexyloxyphenol) methoxyphenyl triazine, 20g of aloe extract, 20g of antioxidant BHT (butylated hydroxytoluene) 20g and 15g of beeswax.
As shown in fig. 1, the specific thermal paper preparation process includes the following steps,
pre-dissolving beeswax: mixing the beeswax and acetone according to the proportion, and stirring until the beeswax is completely dissolved to obtain a beeswax solution; in order to accelerate the dissolution of beeswax, beeswax may be ground to a powder state beforehand.
Preparing a sun-proof antibacterial material: weighing the aloe extract, the antioxidant BHT, the nano silicon dioxide, the nano zinc oxide and the nano titanium dioxide according to the proportion, adding into a high-speed mixer, and stirring and mixing uniformly at the rotating speed of 3500 rpm; then sequentially adding the prepared beeswax solution and the bis (ethylhexyloxyphenol methoxyphenyl) triazine, and continuously stirring until the mixture is uniformly mixed to obtain a mixture;
wherein the aloe extractive solution is prepared by the process shown in figure 2,
step one, peeling aloe, mashing, adding 1.5mol/L sodium carbonate solution with the same volume, and uniformly stirring to obtain a mixture;
step two: placing the mixture obtained in the step one at 28 ℃ for heat preservation and extraction for 45min, and filtering to obtain an extract liquid after the heat preservation is finished;
step three: and adding activated carbon powder accounting for 2wt% of the extraction liquid into the extraction liquid obtained in the step two, carrying out ultrasonic treatment for 10min, and filtering to obtain an aloe extraction liquid for later use.
And (3) solvent removal: removing acetone in the mixture by adopting a reduced pressure evaporation method, grinding, and sieving with a 400-mesh sieve to obtain the sun-proof antibacterial material for later use.
Coating a sun-proof antibacterial layer: and mixing the sun-proof antibacterial material and the acrylate adhesive weighed according to the proportion, uniformly stirring, uniformly coating the mixture on the front side and the back side of the raw paper layer, and curing the acrylate adhesive to form the sun-proof antibacterial layer.
Coating a thermosensitive coating layer: uniformly coating a thermosensitive coating on the surface of the raw paper layer coated with the sun-proof antibacterial layer to form a thermosensitive color-changing layer; the processing method of the thermosensitive color-changing layer adopts the conventional thermosensitive paint coating process to coat and process.
And (3) arranging a protective layer: and after finishing coating the thermosensitive paint, laminating a polyester film layer on the surface of the thermosensitive color-changing layer to obtain the sun-proof antibacterial thermosensitive paper.
Example 3:
the utility model provides a resistant antibacterial thermal sensitive paper that shines, its is including the protective layer, the thermochromic layer, the resistant antibacterial layer that shines, the raw paper layer, the resistant antibacterial layer that shines, thermochromic layer and protective layer that laminate setting in proper order, and two sides all can be printed. The protective layer is a polyester film layer, and the thermosensitive color-changing layer is formed by coating thermosensitive paint by adopting a conventional coating process. In order to improve the storage stability of the thermal sensitive paper, the sun resistance and the antibacterial performance after color development, the sun-resistant antibacterial layer which is clamped and embedded between the thermal sensitive color-changing layer and the raw paper layer is formed by coating the raw materials according to the following proportion: 900g of acrylate adhesive, 180g of nano silicon dioxide, 90g of nano zinc oxide, 90g of nano titanium dioxide, 560g of acetone, 65g of bis (ethylhexyloxyphenol) methoxyphenyl triazine, 30g of aloe extract, 30g of antioxidant BHT (butylated hydroxytoluene), and 20g of beeswax.
As shown in fig. 1, the specific thermal paper preparation process includes the following steps,
pre-dissolving beeswax: mixing the beeswax and acetone according to the proportion, and stirring until the beeswax is completely dissolved to obtain a beeswax solution; in order to accelerate the dissolution of beeswax, beeswax may be ground to a powder state beforehand.
Preparing a sun-proof antibacterial material: weighing the aloe extract, the antioxidant BHT, the nano silicon dioxide, the nano zinc oxide and the nano titanium dioxide according to the proportion, adding into a high-speed mixer, and stirring and mixing uniformly at the rotating speed of 4000 rpm; then sequentially adding the prepared beeswax solution and the bis (ethylhexyloxyphenol methoxyphenyl) triazine, and continuously stirring until the mixture is uniformly mixed to obtain a mixture;
wherein the aloe extractive solution is prepared by the process shown in figure 2,
step one, peeling aloe, mashing, adding 2.0mol/L sodium carbonate solution with the same volume, and uniformly stirring to obtain a mixture;
step two: placing the mixture obtained in the step one at 30 ℃ for heat preservation and extraction for 40min, and filtering to obtain an extract liquid after the heat preservation is finished;
step three: and adding activated carbon powder accounting for 3wt% of the extraction liquid into the extraction liquid obtained in the step two, carrying out ultrasonic treatment for 13min, and filtering to obtain an aloe extraction liquid for later use.
And (3) solvent removal: removing acetone in the mixture by adopting a reduced pressure evaporation method, grinding, and sieving with a 400-mesh sieve to obtain the sun-proof antibacterial material for later use.
Coating a sun-proof antibacterial layer: and mixing the sun-proof antibacterial material and the acrylate adhesive weighed according to the proportion, uniformly stirring, uniformly coating the mixture on the front side and the back side of the raw paper layer, and curing the acrylate adhesive to form the sun-proof antibacterial layer.
Coating a thermosensitive coating layer: uniformly coating a thermosensitive coating on the surface of the raw paper layer coated with the sun-proof antibacterial layer to form a thermosensitive color-changing layer; the processing method of the thermosensitive color-changing layer adopts the conventional thermosensitive paint coating process to coat and process.
And (3) arranging a protective layer: and after finishing coating the thermosensitive paint, laminating a polyester film layer on the surface of the thermosensitive color-changing layer to obtain the sun-proof antibacterial thermosensitive paper.
Example 4:
the utility model provides a resistant antibacterial thermal sensitive paper that shines, its is including the protective layer, the thermochromic layer, the resistant antibacterial layer that shines, the raw paper layer, the resistant antibacterial layer that shines, thermochromic layer and protective layer that laminate setting in proper order, and two sides all can be printed. The protective layer is a polyester film layer, and the thermosensitive color-changing layer is formed by coating thermosensitive paint by adopting a conventional coating process. In order to improve the storage stability of the thermal sensitive paper, the sun resistance and the antibacterial performance after color development, the sun-resistant antibacterial layer which is clamped and embedded between the thermal sensitive color-changing layer and the raw paper layer is formed by coating the raw materials according to the following proportion: 950g of acrylate adhesive, 190g of nano silicon dioxide, 95g of nano zinc oxide, 95g of nano titanium dioxide, 580g of acetone, 75g of bis (ethylhexyloxyphenol) methoxyphenyl triazine, 40g of aloe extract, 40g of antioxidant BHT (butylated hydroxytoluene), and 25g of beeswax.
As shown in fig. 1, the specific thermal paper preparation process includes the following steps,
pre-dissolving beeswax: mixing the beeswax and acetone according to the proportion, and stirring until the beeswax is completely dissolved to obtain a beeswax solution; in order to accelerate the dissolution of beeswax, beeswax may be ground to a powder state beforehand.
Preparing a sun-proof antibacterial material: weighing the aloe extract, the antioxidant BHT, the nano silicon dioxide, the nano zinc oxide and the nano titanium dioxide according to the proportion, adding into a high-speed mixer, and stirring and mixing uniformly at the rotating speed of 4500 rpm; then sequentially adding the prepared beeswax solution and the bis (ethylhexyloxyphenol methoxyphenyl) triazine, and continuously stirring until the mixture is uniformly mixed to obtain a mixture;
wherein the aloe extractive solution is prepared by the process shown in figure 2,
step one, peeling aloe, mashing, adding 2.5mol/L sodium carbonate solution with the same volume, and stirring uniformly to obtain a mixture;
step two: placing the mixture obtained in the step one at 30 ℃ for heat preservation and extraction for 40min, and filtering to obtain an extract liquid after the heat preservation is finished;
step three: adding activated carbon powder accounting for 4wt% of the extract into the extract obtained in the second step, performing ultrasonic treatment for 13min, and filtering to obtain aloe extract for later use.
And (3) solvent removal: removing acetone in the mixture by adopting a reduced pressure evaporation method, grinding, and sieving with a 400-mesh sieve to obtain the sun-proof antibacterial material for later use.
Coating a sun-proof antibacterial layer: and mixing the sun-proof antibacterial material and the acrylate adhesive weighed according to the proportion, uniformly stirring, uniformly coating the mixture on the front side and the back side of the raw paper layer, and curing the acrylate adhesive to form the sun-proof antibacterial layer.
Coating a thermosensitive coating layer: uniformly coating a thermosensitive coating on the surface of the raw paper layer coated with the sun-proof antibacterial layer to form a thermosensitive color-changing layer; the processing method of the thermosensitive color-changing layer adopts the conventional thermosensitive paint coating process to coat and process.
And (3) arranging a protective layer: and after finishing coating the thermosensitive paint, laminating a polyester film layer on the surface of the thermosensitive color-changing layer to obtain the sun-proof antibacterial thermosensitive paper.
Example 5:
the utility model provides a resistant antibacterial thermal sensitive paper that shines, its is including the protective layer, the thermochromic layer, the resistant antibacterial layer that shines, the raw paper layer, the resistant antibacterial layer that shines, thermochromic layer and protective layer that laminate setting in proper order, and two sides all can be printed. The protective layer is a polyester film layer, and the thermosensitive color-changing layer is formed by coating thermosensitive paint by adopting a conventional coating process. In order to improve the storage stability of the thermal sensitive paper, the sun resistance and the antibacterial performance after color development, the sun-resistant antibacterial layer which is clamped and embedded between the thermal sensitive color-changing layer and the raw paper layer is formed by coating the raw materials according to the following proportion: 1000g of acrylate adhesive, 200g of nano silicon dioxide, 100g of nano zinc oxide, 100g of nano titanium dioxide, 600g of acetone, 80g of bis (ethylhexyloxyphenol) methoxyphenyl triazine, 50g of aloe extract, 50g of antioxidant BHT (butylated hydroxytoluene), and 30g of beeswax.
As shown in fig. 1, the specific thermal paper preparation process includes the following steps,
pre-dissolving beeswax: mixing the beeswax and acetone according to the proportion, and stirring until the beeswax is completely dissolved to obtain a beeswax solution; in order to accelerate the dissolution of beeswax, beeswax may be ground to a powder state beforehand.
Preparing a sun-proof antibacterial material: weighing the aloe extract, the antioxidant BHT, the nano silicon dioxide, the nano zinc oxide and the nano titanium dioxide according to the proportion, adding into a high-speed mixer, and stirring and mixing uniformly at the rotating speed of 5000 rpm; then sequentially adding the prepared beeswax solution and the bis (ethylhexyloxyphenol methoxyphenyl) triazine, and continuously stirring until the mixture is uniformly mixed to obtain a mixture;
wherein the aloe extractive solution is prepared by the process shown in figure 2,
step one, peeling aloe, mashing, adding 3.0mol/L sodium carbonate solution with the same volume, and uniformly stirring to obtain a mixture;
step two: placing the mixture obtained in the step one at 35 ℃ for heat preservation and extraction for 30min, and filtering to obtain an extract liquid after the heat preservation is finished;
step three: and adding activated carbon powder accounting for 5wt% of the extraction liquid into the extraction liquid obtained in the step two, carrying out ultrasonic treatment for 15min, and filtering to obtain an aloe extraction liquid for later use.
And (3) solvent removal: removing acetone in the mixture by adopting a reduced pressure evaporation method, grinding, and sieving with a 400-mesh sieve to obtain the sun-proof antibacterial material for later use.
Coating a sun-proof antibacterial layer: and mixing the sun-proof antibacterial material and the acrylate adhesive weighed according to the proportion, uniformly stirring, uniformly coating the mixture on the front side and the back side of the raw paper layer, and curing the acrylate adhesive to form the sun-proof antibacterial layer.
Coating a thermosensitive coating layer: uniformly coating a thermosensitive coating on the surface of the raw paper layer coated with the sun-proof antibacterial layer to form a thermosensitive color-changing layer; the processing method of the thermosensitive color-changing layer adopts the conventional thermosensitive paint coating process to coat and process.
And (3) arranging a protective layer: and after finishing coating the thermosensitive paint, laminating a polyester film layer on the surface of the thermosensitive color-changing layer to obtain the sun-proof antibacterial thermosensitive paper.
Comparative example:
a thermal paper differing from example 5 only in that: no sunscreen layer was included.
Performance testing
Light resistance test: the thermal papers of examples 1 to 5 and the comparative example were used as test samples, and each test sample was classified into A, B, C groups, which were treated differently.
A. Without any treatment, the printing is directly used for printing, and the color of the printed character pattern is observed under a light source D65;
B. after irradiating for 1h by using a 200W ultraviolet lamp, printing, and observing the color of the printed character pattern under a D65 light source;
C. after printing, irradiating for 1h by using a 200W ultraviolet lamp, and observing the color of the printed character pattern under a D65 light source;
the gray scale (1-9 levels) was determined by comparing the colors of three sets of test samples of the same specimen with a standard color chart.
And (3) bacteriostatic test: the heat-sensitive papers of examples 1 to 5 and the comparative example were used as test samples, each of which was divided into two groups of D, E, group D was placed in a closed container, group E was placed in an open container, and after storage at 25 ℃ and 60% humidity for 24 hours, the number of E.coli colonies (X) on the samples was measured, respectivelyD、XE) And calculating the growth rate alpha, alpha = { (X) of Escherichia coliE-XD）/XD}×100%。
The test results are reported in table 1:
table 1.
The test data of the comparative examples and comparative examples show that: the thermal sensitive paper has excellent light fastness, and the final color change is small no matter the thermal sensitive paper is subjected to sunshine before printing or after printing, so that the bright and durable color can be protected after the thermal sensitive paper is printed. Meanwhile, experimental data show that the thermal sensitive paper has good antibacterial performance, can effectively inhibit the breeding of bacteria, and is suitable for being used as printing paper with wide circulation, such as ticket printing, supermarket receipt printing and the like.
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can modify the embodiments without inventive contribution as required after reading this specification, but only fall within the scope of the claims of the present invention.
Claims (3)
1. The utility model provides a resistant antibacterial thermal sensitive paper that shines, includes raw paper layer, temperature sensing discoloration layer and protective layer, temperature sensing discoloration layer is pressed from both sides and is inlayed between raw paper layer and protective layer, its characterized in that: the sun-proof antibacterial layers are arranged on the front surface and the back surface of the raw paper layer; the sun-proof antibacterial layer is prepared from the following raw materials in parts by weight,
80-100 parts of acrylate adhesive
30-40 parts of nano inorganic filler
50-60 parts of acetone
5-8 parts of bis (ethylhexyloxyphenol) methoxyphenyl triazine
1-5 parts of aloe extract
1-5 parts of antioxidant BHT
1-3 parts of beeswax;
the nano inorganic filler is formed by mixing nano silicon dioxide, nano zinc oxide and nano titanium dioxide according to the mass ratio of 1:0.5: 0.5;
the preparation method of the sun-proof bacteriostatic thermosensitive paper comprises the following steps,
pre-dissolving beeswax: weighing beeswax and acetone according to a certain proportion, mixing, and stirring until the beeswax is completely dissolved to obtain a beeswax solution;
preparing a sun-proof antibacterial material: weighing the aloe extract, the antioxidant BHT and the nano inorganic filler according to the proportion, and stirring and mixing uniformly; then sequentially adding the prepared beeswax solution and the bis (ethylhexyloxyphenol methoxyphenyl) triazine, and continuously stirring until the mixture is uniformly mixed to obtain a mixture;
and (3) solvent removal: removing acetone in the mixture by a reduced pressure evaporation method, grinding and sieving to obtain a sun-proof antibacterial material for later use;
coating a sun-proof antibacterial layer: mixing the sun-proof antibacterial material and the acrylate adhesive weighed in proportion, uniformly stirring, and uniformly coating on the front and back surfaces of the raw paper layer to form a sun-proof antibacterial layer;
coating a thermosensitive coating layer: uniformly coating a thermosensitive coating on the surface of the raw paper layer coated with the sun-proof antibacterial layer to form a thermosensitive color-changing layer;
and (3) arranging a protective layer: and pressing and covering a polyester film layer on the surface of the thermosensitive color-changing layer after the thermosensitive paint is coated to obtain the protective layer.
2. The sun-proof bacteriostatic heat-sensitive paper according to claim 1, characterized in that: the preparation steps of the sun-proof antibacterial material are completed in a high-speed mixer, and the rotating speed is controlled to be 3000-5000rpm in the material mixing process.
3. The sun-proof bacteriostatic heat-sensitive paper according to claim 1, characterized in that: the aloe extract is prepared by the following process,
step one, peeling aloe, mashing, adding 1.0-3.0mol/L sodium carbonate solution with the same volume, and uniformly stirring to obtain a mixture;
step two: placing the mixture obtained in the step one at the temperature of 28-35 ℃ for heat preservation and extraction for 30-45min, and filtering to obtain an extract liquid after the heat preservation is finished;
step three: adding activated carbon powder 1-5wt% of the extract into the extract obtained in the second step, performing ultrasonic treatment for 10-15min, and filtering to obtain aloe extract for later use.
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| CN111827004A (en) * | 2020-05-26 | 2020-10-27 | 湖南天琪智慧印刷有限公司 | Thermal sensitive paper suitable for backing-paper-free label and manufacturing method thereof |
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