CN115991944A - Water-based phase change ink particles and preparation method and application thereof - Google Patents
Water-based phase change ink particles and preparation method and application thereof Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Abstract
The invention discloses an aqueous phase change ink particle, which comprises a core layer and a skin layer wrapping the outside of the core layer, wherein the core layer comprises polyethylene glycol and unsaturated polyester resin, and the skin layer comprises polyurethane solution and cesium tungsten bronze. The preparation method of the water-based phase change ink particles has excellent phase change performance, heat absorption and heat preservation capability, and cesium tungsten bronze has strong temperature control performance and fireproof flame retardant performance, and the polyurethane solution has the stability maintenance effect of the base liquid, so that the cesium tungsten bronze is not easy to scatter, and the overall particle effect is stable.
Description
Technical Field
The invention relates to the technical field of composite material phase change ink, in particular to a preparation method of polyurethane and polyethylene glycol composite water-based phase change ink particles with a heat preservation function, water-based phase change ink particles prepared by the preparation method and application thereof.
Background
The ink is an important material for printing, and comprises main components and auxiliary components which are uniformly mixed and repeatedly rolled to form a viscous colloidal fluid, and the viscous colloidal fluid consists of a binder (resin), pigment, filler, auxiliary agent, solvent and the like. As social demands increase, ink varieties and yields expand and grow accordingly. However, the existing water-based phase change ink particles do not have excellent heat absorption and insulation functions, and the preparation method is not strict and perfect.
For example, patent CN112111193a discloses a phase change ink with temperature control effect, the ink uses microcapsule to encapsulate the phase change material, which has good environmental protection effect, smaller particles are easy to adhere, however, the ink can only achieve the effect of delaying temperature mutation or heat preservation and temperature control, and has insufficient fireproof performance. Patent CN114181563a discloses a low-resistance self-temperature-control ink, which is prepared by combining raw materials such as graphene materials, conductive carbon black powder, polymer emulsion and the like to prepare a temperature-control coating, and has excellent temperature control effect, but the adhesive force of the ink is not high and the application is inconvenient. Patent CN103694790B discloses a water-based ink formulation for flame-retardant wallpaper, which uses distilled water as a solvent in a large amount, and mainly plays the role of flame retardance, however, the application level is small, the corresponding effect is lost when the water-based ink formulation is away from the applicable wallpaper, and the water-based ink formulation has no universality. Patent CN109504167a discloses a water-based ink using water-based epoxy resin and modified acrylic resin as main components, and the main preparation method is physical grinding, so that the use of solvents is avoided, the safety of the ink is improved to a certain extent, the risk of inflammability and explosiveness is reduced, but the problems of unbalanced ink performance, unstable application effect and the like are caused.
Disclosure of Invention
In view of the above, it is an object of the present invention to provide a method for preparing aqueous phase change ink particles.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an aqueous phase change ink particle comprising a core layer and a skin layer surrounding the core layer, the core layer comprising polyethylene glycol and an unsaturated polyester resin, the skin layer comprising a polyurethane solution and cesium tungsten bronze. Wherein the skin layer plays a role in flame retardance, heat preservation, heat storage and temperature adjustment, the core layer mainly has a phase change function, the prepared core layer is in a molten state, the skin layer is in a solution in the early stage of preparation, and the core layer becomes solid after being cooled until the prepared particles are cooled.
According to some preferred embodiments of the present invention, the mass ratio between polyethylene glycol and unsaturated polyester resin in the core layer is 5:5-8, preferably 5:6.
according to some preferred embodiments of the invention, the mass ratio between the polyurethane solution and cesium tungsten bronze in the skin layer is 15-25: 1, preferably 20:1.
According to some preferred embodiments of the invention, the ratio between the thickness of the skin layer and the radius of the core layer is between 0.8 and 1.2:1, preferably 1:1, i.e. the radius of the particle as a whole is twice the radius of the inner core layer.
According to some preferred embodiments of the invention, the core layer is prepared by the following method: and pouring polyethylene glycol in a hot-melt state into unsaturated polyester resin, and uniformly mixing at 60 ℃ to obtain a molten core layer.
According to some preferred embodiments of the present invention, the polyurethane material contained in the polyurethane solution is PPC-TPU (polypropylene carbonate diol thermoplastic polyurethane elastomer).
According to some preferred embodiments of the present invention, the polyurethane solution comprises, in parts by weight, 6 parts of PPC-TPU, 22-26 parts of dimethylformamide and 0.5-3 parts of toluene. Preferably 24 parts of dimethylamide, 6 parts of PPCTPU and 1 part of toluene. The mass fraction of the prepared polyurethane solution is 18% -22%.
According to some preferred embodiments of the invention, the polyurethane solution is prepared by: PPC-TPU was dissolved in 40% by weight dimethylformamide and toluene (C) 7 H 8 ) And uniformly mixing to obtain the polyurethane solution. The dissolution temperature is 38-45 ℃, the stirring time is 3-4 hours, the PPT-TPU solution is thoroughly fused, and the solute is uniformly dispersed in the solution. The concentration of DMF is 40wt% and is properThe cesium tungsten bronze has better use effect in the proportion of cesium tungsten bronze.
According to some preferred embodiments of the present invention, the aqueous phase change ink particles have a particle size of 10 to 15 μm.
The invention also provides a preparation method of the aqueous phase change ink particles, which comprises the following steps:
respectively preparing polyurethane solution and a molten core layer;
adding cesium tungsten bronze powder into the polyurethane solution and uniformly mixing to obtain a cortex solution;
filling the sheath solution into an external needle tube, filling the molten core layer into an internal needle tube, sleeving the external needle tube on the outer side of the internal needle tube, taking out the sheath solution and the molten core layer by adopting an air spraying method, and wrapping the sheath solution on the outer side of the molten core layer to form liquid drops;
and the liquid drops fall into a cooling medium, and the water-based phase change ink particles are obtained after filtering and drying.
According to some preferred embodiments of the invention, the inner diameter of the air jet pipeline is 20-40mm, the air pressure is 0.3-0.5MPa, and the air flow speed is 8-10m/s.
According to some preferred embodiments of the invention, the distilled water in the vessel is kept at normal temperature.
The invention also provides application of the aqueous phase change ink particles in ink and application of the aqueous phase change ink particles in preparation of printed fabrics. For example, the printing ink is heated at 180-190 ℃ and then is adhered and transferred to fabric fibers, and the fabric adhered with the aqueous phase change printing ink has a certain heat absorption and insulation function, can be widely applied to products such as heat insulation covers of electric vehicles and snow covers of automobiles, and can effectively keep warm and prevent cold in winter.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages: the preparation method of the water-based phase change ink particles has excellent phase change performance, heat absorption and heat preservation capability, and cesium tungsten bronze has strong temperature control performance and fireproof flame retardant performance, and the polyurethane solution has the stability maintenance effect of the base liquid, so that the cesium tungsten bronze is not easy to scatter, and the overall particle effect is stable.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic cross-sectional view of an aqueous phase change ink particle prepared in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic view of a portion of a needle according to a preferred embodiment of the present invention;
FIG. 3 is a graph showing the results of testing the thermal insulation effect according to the preferred embodiment of the present invention;
in the drawings, 1-1 is cesium tungsten bronze Cs in aqueous phase change ink particles 0.33 WO 3 Is a powder particle of (2); 1-2 is a composite core layer formed by PEG and UPR; 1-3 is polyurethane solution; 1 is water phase change ink particles extruded from a needle tube; 2 is an inner needle head with the thickness of 21G, and 3 is an outer needle head with the thickness of 17G; 4 is a receiving vessel after the particles are extruded; 5 is a sleeve outside the needle tube; and 6, normal-temperature distilled water in the receiving vessel.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
In order to solve the problems of complex preparation method, unstable effect, poor pertinence, insufficient fireproof performance and the like of the heat-preservation water-based phase change ink in the prior art. The invention provides water-based ink particles with a phase change function and a preparation method thereof.
Wherein the particle size of the water-based ink particles with the phase change function is 10-15 mu m, the water-based ink particles comprise a skin layer and a core layer, and the skin layer is prepared from polyurethane solution and cesium tungsten bronze Cs 0.33 WO 3 Composition of cesium tungsten bronze Cs 0.33 WO 3 The particles are uniformly embedded and distributed in the porous structure of the polyester polyurethane, and the polyurethane solution mainly comprises 6 parts of PPC-TPU, 22-26 parts of 40wt% Dimethylformamide (DMF) and 0.5-3 parts of toluene (C) 7 H 8 ) Composition; the core layer adopts a composite molten state material formed by 5 parts of phase-change polyethylene glycol (PEG) and 5-8 parts of polyester resin (UPR).
Polyurethane solution in skin layer and cesium tungsten bronze Cs 0.33 WO 3 The mass ratio of the cesium tungsten bronze to the polyurethane solution is 15-25:1, the cesium tungsten bronze has strong temperature control performance and fireproof flame retardant performance, the polyurethane solution has the stability maintaining effect of the base solution, the cesium tungsten bronze is not easy to scatter, and the overall particle effect is stable.
The ratio between the thickness of the skin layer and the radius of the core layer is 0.8-1.2: 1, preferably 1:1, i.e. the radius of the particle as a whole is twice the radius of the inner core layer.
The preparation method of the water-based phase change ink particles comprises the following steps:
step S1, preparing polyurethane solution and a molten core layer
Preparation of polyurethane solutions
PPC-TPU was dissolved in 40% by weight dimethylformamide and toluene (C) 7 H 8 ) And uniformly mixing to obtain the polyurethane solution. The dissolution temperature is 38-45 ℃, the stirring time is 3-4 hours, the PPT-TPU solution is thoroughly fused, and the solute is uniformly dispersed in the solution. The cesium tungsten bronze has better use effect by selecting 40wt% of DMF concentration and proper proportion of cesium tungsten bronze.
Preparation of a molten core layer
The core layer is prepared by the following method: and pouring polyethylene glycol in a hot-melt state into unsaturated polyester resin, and uniformly mixing at 60 ℃ to obtain a molten core layer.
The prepared meltingThe phase transition temperature of the state composite core layer is 59.6-60.7 ℃, the boiling point of Dimethylformamide (DMF) in the polyurethane solution is 153 ℃, and toluene (C) 7 H 8 ) The boiling point of (2) is 110 ℃.
Step S2, preparing cortical solution
Adding cesium tungsten bronze Cs with preset proportion into polyurethane solution 0.33 WO 3 Powder and evenly mixed by magnetic stirring. The magnetic stirring time is 3-4h, so that cesium tungsten bronze Cs 0.33 WO 3 The powder can be uniformly dispersed, and the overall performance of the particles is uniform and stable.
Step S3, filling needle tube
Filling the sheath solution into an external needle tube, and filling the molten core layer into an internal needle tube; simultaneously, the speed and the gas pressure of the gas spraying pipeline are adjusted. The inner diameter of the external air spraying pipeline is 20-40mm, the air pressure is 0.3-0.5MPa, the air flow speed is 8-10m/s, and the pressure speed of the air flow ensures that particles can uniformly and efficiently fall into a lower receiving vessel at a uniform speed.
Step S4, air spraying to form particles
The particles sprayed by the air fall into a receiving vessel below, and normal-temperature distilled water with a certain depth in the vessel can quickly and effectively cool and shape the particles in the solution, and the water-based phase change ink particles can be obtained through filtering and drying.
The PPC-TPU material in the examples below was purchased from Jingjiang, kost.
Example 1
Referring to fig. 1 and 2, the preparation method of the aqueous ink particles with phase change function in this embodiment specifically includes the following steps:
step S1, preparing a sheath solution and a molten core layer
Preparation of cortical solution
The sheath solution includes cesium tungsten bronze Cs 0.33 WO 3 Powder particles 1-1 and PPC-TPU polyurethane solution 1-3. In preparation, PPC-TPU was dissolved in 40% by weight Dimethylformamide (DMF) and toluene (C) was added 7 H 8 ) And then evenly mixing to obtain the product. In this example, the mass ratio of PPC-TPU to tolueneIs 6:1, the dissolution temperature is 38 ℃, and the stirring time is 3h.
Cesium tungsten bronze Cs is added into the prepared polyurethane solution 0.33 WO 3 Powder, polyurethane resin solution and cesium tungsten bronze Cs 0.33 WO 3 The mass ratio of the powder is 20:1, and the powder is stirred for 3 hours by magnetic force to obtain a cortical solution.
Preparation of a molten core layer
The core layer is made of a composite material formed by phase-change polyethylene glycol (PEG) and Unsaturated Polyester Resin (UPR), and the preparation process is as follows: and pouring the PEG in the hot melting state into the UPR test solution, and stirring at 60 ℃ to uniformly mix the PEG and the UPR test solution to obtain the molten core layer.
S2, filling the needle tube and spraying air to form particles
The needles of the two thicknesses (an inner needle of thickness 21G and an outer needle of thickness 17G) were welded in advance to prepare a coaxial air jet device.
In order to prevent the solution from being completely solidified and cooled, the prepared skin layer solution is filled into an external needle tube within 10 minutes, a molten core layer is filled into an internal needle tube, the combined needle tube is stretched into an air injection pipeline, and meanwhile, the air pressure in the air injection pipeline is regulated to be 0.5MPa, and the air flow speed is regulated to be 10m/s.
And (3) performing air spraying, wherein particles sprayed by the air fall into a receiving vessel below, distilled water at normal temperature is arranged in the vessel, and the water-based phase change ink particles can be obtained through filtering and drying.
The outer needle mentioned in this example was 17G (outer 1.50mm,inner 1.04mm), the inner needle was 21G (outer 0.81mm,inner 0.51mm), and the inner diameter of the outer air jet pipe was 30mm.
Example 2
Referring to fig. 1 and 2, the preparation method of the aqueous ink particles with phase change function in this embodiment specifically includes the following steps:
step S1, preparing a sheath solution and a molten core layer
Preparation of cortical solution
The sheath solution includes cesium tungsten bronze Cs 0.33 WO 3 Powder particles 1-1 and PPC-TPU polyurethane solution 1-3.In preparation, PPC-TPU was dissolved in 40% by weight Dimethylformamide (DMF) and toluene (C) was added 7 H 8 ) And then evenly mixing to obtain the product. In this example, PPC-TPU is reacted with toluene (C 7 H 8 ) The mass ratio of (2) is 6:1, the dissolution temperature is 38 ℃, and the stirring time is 4h.
Cesium tungsten bronze Cs is added into the prepared polyurethane solution 0.33 WO 3 Powder, polyurethane resin solution and cesium tungsten bronze Cs 0.33 WO 3 The mass ratio of the powder is 25:1, and the powder is stirred for 4 hours by magnetic force to obtain a cortical solution.
Preparation of a molten core layer
The core layer is made of a composite material formed by phase-change polyethylene glycol (PEG) and Unsaturated Polyester Resin (UPR), and the preparation process is as follows: and pouring the PEG in the hot melting state into the UPR test solution, and stirring at 60 ℃ to uniformly mix the PEG and the UPR test solution to obtain the molten core layer.
S2, filling the needle tube and spraying air to form particles
The two kinds of thick and thin needle heads are combined and welded in advance to prepare the coaxial air spraying device. In order to prevent the solution from being completely solidified and cooled, the prepared skin layer solution is filled into an external needle tube within 10min, the molten core layer is filled into an internal needle tube, the combined needle tube is stretched into an air injection pipeline, and meanwhile, the air pressure in the air injection pipeline is regulated to be 0.5MPa, and the air flow speed is regulated to be 12m/s.
And (3) performing air spraying, wherein particles sprayed by the air fall into a receiving vessel below, distilled water at normal temperature is arranged in the vessel, and the water-based phase change ink particles can be obtained through filtering and drying.
The proportion of cesium tungsten bronze powder in the embodiment is increased, so that the infrared heat insulation performance is better.
Example 3
Referring to fig. 1 and 2, the preparation method of the aqueous ink particles with phase change function in this embodiment specifically includes the following steps:
step S1, preparing a sheath solution and a molten core layer
Preparation of cortical solution
The sheath solution includes cesium tungsten bronze Cs 0.33 WO 3 Powder particles 1-1 and PPC-TPU polyurethane solution 1-3. In preparation, PPC-TPU was dissolved in 40% by weight Dimethylformamide (DMF) and toluene (C) was added 7 H 8 ) And then evenly mixing to obtain the product. In this example, PPC-TPU is reacted with toluene (C 7 H 8 ) The mass ratio of (2) is 6:1, the dissolution temperature is 38 ℃, and the stirring time is 3h.
Cesium tungsten bronze Cs is added into the prepared polyurethane solution 0.33 WO 3 Powder, polyurethane resin solution and cesium tungsten bronze Cs 0.33 WO 3 The mass ratio of the powder is 15:1, and the powder is stirred for 3 hours by magnetic force to obtain a cortical solution.
Preparation of a molten core layer
The core layer is made of a composite material formed by phase-change polyethylene glycol (PEG) and Unsaturated Polyester Resin (UPR), and the preparation process is as follows: and pouring the PEG in the hot melting state into the UPR test solution, and stirring at 60 ℃ to uniformly mix the PEG and the UPR test solution to obtain the molten core layer.
S2, filling the needle tube and spraying air to form particles
And combining and welding the two thick and thin needle heads in advance to prepare the coaxial electrostatic gas spraying device. In order to prevent the solution from being completely solidified and cooled, the prepared skin layer solution is filled into an external needle tube within 10 minutes, a molten core layer is filled into an internal needle tube, the combined needle tube is stretched into an air injection pipeline, and meanwhile, the air pressure in the air injection pipeline is regulated to be 0.5MPa, and the air flow speed is regulated to be 10m/s.
And (3) performing air spraying, wherein particles sprayed by the air fall into a receiving vessel below, distilled water at normal temperature is arranged in the vessel, and the water-based phase change ink particles can be obtained through filtering and drying.
Comparative example 1
The difference between this comparative example and example 1 is that no cesium tungsten bronze Cs was added to the skin layer solution in this comparative example 0.33 WO 3 The powder particles, remaining steps and parameters were substantially identical to those of example 1.
Since cesium tungsten bronze Cs is not contained in this comparative example 0.33 WO 3 The powder particles can reduce the heat absorption and heat preservation functions of the prepared ink particles, and not only the overall heat stability is reduced, but also the heat absorption is reducedThe exothermic function is also incomplete.
Comparative example 2
The difference between the comparative example and the example 1 is that the comparative example does not adopt a coaxial temperature control blowing method to carry out particle molding manufacture, and the extrusion of a needle head only causes unstable shape and size of the formed particles, uneven forming speed and uneven performance under the condition of using a large amount of particles, and the overall phase change heat preservation efficiency is reduced.
Example 4
The aqueous phase change ink particle ink prepared in the embodiment is subjected to heat treatment at 180-190 ℃ and then is adhered and transferred to fabric fibers, and the fabric adhered with the aqueous phase change ink has a certain heat absorption and insulation function, can be widely applied to products such as heat insulation covers of electric vehicles and snow protection covers of vehicles, and can effectively keep warm and prevent cold in winter.
Testing and results
In hot and cold environments, the common aqueous ink particles without phase change material polyethylene glycol (PEG) and cesium tungsten bronze powder, the ink particles prepared in comparative example 1, and the ink particles prepared in example 1 were numbered i, ii, and iii, respectively, and after each number was attached to six identical fabrics, two groups of experimental particles were taken, the first group was placed under an infrared lamp for 120 seconds and then the infrared lamp was removed to observe the temperature change of the fabric, the second group was placed on the fabric for 120 seconds and then the ice was removed to observe the temperature change of the fabric, and a graph was drawn as shown in fig. 3.
As can be seen from fig. 3, the ink particles prepared in the embodiment 1 of the present invention have good heat storage, temperature adjustment and temperature control effects under hot and cold conditions, and people can alleviate discomfort caused by a large environmental temperature difference under the fabric to which the ink is attached.
Compared with the prior art, the technical scheme of the invention has the following advantages:
(1) The water-based phase change ink particles have excellent phase change performance, have heat absorption, heat preservation and water resistance, can meet the use requirements of the ink under various conditions, have wide applicability and practicability, can be effectively used for keeping warm and preventing cold in winter when applied to outdoor textiles such as heat preservation covers of electric vehicles and snow covers of automobiles, and provide basic water resistance, so that users have better experience.
(2) The preparation method of the water-based phase change ink particles adopts the combination of a melting method, a solvent method, an air-jet method and the like, and simplifies the preparation method of the sheath-core particles to a certain extent.
(3) The water-based phase change ink particles adopt the design of combining the coaxial needle tubes of the skin layer and the core layer, so that the particle structure and the performance are stable, the overall performance is fused, the core layer and the skin layer are tightly bonded, the internal structure is fixed, and the particles are not easy to scatter.
(4) The water-based phase change ink particles of the invention adopt cesium tungsten bronze Cs 0.33 WO 3 UPR material and PPC-TPU material, so that the heat absorbing and releasing performance and the heat preserving performance are further improved, and the PPC-TPU material is heated to release CO 2 The gas can effectively resist flame, the material is uniformly dispersed in the particles by the preparation method, the whole particles retain the original performance of the ink, and meanwhile, the fireproof performance is uniform, and the effect is stable.
The basic principle of the invention is as follows: cesium tungsten bronze is an excellent near infrared absorber and has near infrared shielding effect, and the addition of cesium tungsten bronze powder can reduce the near infrared transmittance of TPU fibers. The phase change material can realize the ordered and disordered reversible conversion of phase change molecules according to the change of the ambient temperature, and plays a role in buffering the environmental change. Meanwhile, according to the graph result, cesium tungsten bronze has good temperature-regulating and heat-accumulating effects; the PPC-TPU material emits CO when heated 2 The gas can also play an effective role in flame retardance.
The above embodiments of the present invention are only for illustrating the technical concept and features of the present invention, and are not intended to limit the scope of the present invention to those skilled in the art to understand the present invention and implement the same. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
Claims (10)
1. An aqueous phase change ink particle comprising a core layer and a skin layer surrounding the core layer, wherein the core layer comprises polyethylene glycol and an unsaturated polyester resin, and the skin layer comprises a polyurethane solution and cesium tungsten bronze.
2. The aqueous phase change ink particles of claim 1 wherein the mass ratio between polyethylene glycol and unsaturated polyester resin in the core layer is 5:5-8.
3. The aqueous phase change ink particles of claim 1 wherein the mass ratio between the polyurethane solution and cesium tungsten bronze in the skin layer is 15 to 25:1.
4. the aqueous phase change ink particles of claim 1 wherein the ratio between the thickness of the skin layer and the radius of the core layer is 0.8 to 1.2:1.
5. the aqueous phase change ink particles of claim 1 wherein the core layer is prepared by a process comprising: and pouring polyethylene glycol in a hot-melt state into unsaturated polyester resin, and uniformly mixing at 60 ℃ to obtain a molten core layer.
6. The aqueous phase change ink particles of claim 5 wherein the polyurethane solution comprises, in parts by weight, 6 parts PPC-TPU, 22-26 parts dimethylformamide, and 0.5-3 parts toluene.
7. The aqueous phase change ink particles of claim 5 wherein the polyurethane solution is prepared by a process comprising: and dissolving the PPC-TPU in dimethylformamide and toluene, and uniformly mixing to obtain the polyurethane solution.
8. The aqueous phase change ink particles of any one of claims 1-7 having a particle size of 10-15 μm.
9. A method of preparing the aqueous phase change ink particles of any one of claims 1-8, comprising the steps of:
respectively preparing polyurethane solution and a molten core layer;
adding cesium tungsten bronze powder into the polyurethane solution and uniformly mixing to obtain a cortex solution;
filling the sheath solution into an external needle tube, filling the molten core layer into an internal needle tube, sleeving the external needle tube on the outer side of the internal needle tube, taking out the sheath solution and the molten core layer in the needle tube by adopting an air spraying method, and wrapping the sheath solution on the outer side of the molten core layer to form liquid drops;
and the liquid drops fall into a cooling medium, and the water-based phase change ink particles are obtained after filtering and drying.
10. Use of the aqueous phase change ink particles of any one of claims 1 to 8 in inks and textiles.
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Cited By (1)
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