Raschel blanket with photonic crystal structure for coloring and preparation method of Raschel blanket

Abstract

The invention relates to the technical field of blanket preparation, in particular to a Raschel blanket with a photonic crystal structure for coloring, which comprises a polyester / acrylic Raschel blanket woven on a double-needle bed Raschel warp knitting machine by taking acrylic fibers as velvet yarns and polyester as bottom yarns, and after pretreatment, a photonic crystal liquid color paste spraying process is carried out to prepare the Raschel blanket with the photonic crystal structure for color production. The invention further provides a preparation method of the blanket. The blank of the photonic crystal structure salaschel blanket is filled, the photonic crystal structure salaschel blanket meets the development requirements of textiles in the era, no waste water is generated in the preparation process, no chemical coloring agent is needed, and the photonic crystal structure salaschel blanket is green and free of pollution and has huge development potential and wide market prospects.

Description

Technical Field

[0001] The invention relates to the technical field of blanket preparation, and in particular to a Raschel blanket with photonic crystal structure color and a preparation method thereof. Background Art

[0002] Textiles are usually colored with chemical colorants such as dyes or pigments. This traditional printing and dyeing technology usually uses a large amount of water, alkali and salt, and is difficult to treat wastewater in the later stage, resulting in serious water resource waste and pollution problems. In nature, many organisms have colorful structural colors. Compared with pigment colors, structural colors have many advantages, which are mainly reflected in the following three aspects: First, structural color is the result of the interaction between natural light and the internal microstructure of the material, so the structural color is mainly closely related to the structure of the material. As long as the microstructure of the material does not change, the structural color will not change; second, the structural color is not doped with any chemical dyes and will not cause pollution to the environment, so the structural color is more environmentally friendly than artificial pigments; third, the structural color has an iridescent effect, and the observer can see that different structural colors appear as the angle changes. Photonic crystal structural color is one of the important forms of expression. Photonic crystal is a nanomaterial with a periodic dielectric structure, and its most basic feature is that it has a photonic bandgap. Due to the existence of the photon bandgap, visible light equivalent to the bandgap can be prevented from passing through the photonic crystal, so that it is selectively reflected and forms constructive interference on its surface, thus forming colorful structural colors. According to current research, the application of structural color in the textile field can produce colorful, high-saturation, non-fading, environmentally friendly, green and pollution-free structural color textiles, which can well solve the environmental problems caused by traditional chemical dyeing.

[0003] The nanospheres used to prepare photonic crystals are usually made of hard nanospheres such as polystyrene (PS), silicon dioxide (SiO2) and polymethyl methacrylate (PMMA). Since the prepared photonic crystals are only supported by weak binding forces such as hydrogen bonds and van der Waals forces between nanospheres, the regular structure of the photonic crystals is easily destroyed under the action of external forces, resulting in the disappearance of structural colors, which greatly limits the practical application of photonic crystal structural color technology in the textile field. After decades of development, research on constructing photonic crystal structural colors on fabrics has gradually deepened.

[0004] For example, Chai Liqin et al. [1] The structural stability of PS photonic crystals and SiO2 photonic crystals under different application environments was studied on polyester fabrics. It was found that water medium had little effect on photonic crystals, while the photonic crystal structure would be damaged to varying degrees under strong acid and alkali conditions. Liu Guojin et al. [2] Successfully prepared yarn with photonic crystal structural color, but it is only applicable to knitted fabrics; Shao Jianzhong et al. [3]A method for preparing a photonic crystal structure color-producing fabric is realized by preparing a photonic crystal nano-microsphere dispersion liquid, coating it and using an encapsulant. However, the process described in the above method does not involve the structural design and construction of a photonic crystal structure color Raschel blanket. Summary of the invention

[0005] In view of the shortcomings and deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a Raschel blanket with photonic crystal structure color and a preparation method thereof, which mainly includes using acrylic fiber as velvet yarn and polyester yarn as base yarn to weave on a double needle bed Raschel warp knitting machine and then spraying photonic crystal liquid color paste to obtain the Raschel blanket with photonic crystal structure color. The Raschel blanket to be provided by the present invention has excellent high reflectivity of the solar spectrum, and the acrylic fiber has excellent photonic crystal color characteristics, thereby achieving bright colors under sunlight, flexible and changeable visual effects, and no wastewater discharge in the production process, no need to use dyes, pigments and other chemical colorants, and has the characteristics of low cost, good durability, softness, antistatic, green and pollution-free.

[0006] In order to achieve the purpose of the present invention, the inventor provides the following technical solution:

[0007] The present invention first provides a Raschel blanket with photonic crystal structure color, comprising acrylic fiber as pile yarn and polyester as base yarn, weaving a polyester / acrylic Raschel blanket on a double needle bed Raschel warp knitting machine, and then performing a photonic crystal liquid color paste spraying process after pre-treatment to obtain the Raschel blanket with photonic crystal structure color, wherein:

[0008] The pre-treatment is as follows: firstly, the polyester / acrylic Raschel blanket is subjected to air plasma etching, then washed and dried.

[0009] The photonic crystal liquid color paste is prepared according to the following method:

[0010] Nitrogen is introduced into the reaction kettle for 20 to 30 minutes, and then monomers and deionized water are added in sequence in a volume ratio of 1:8 to 1:12 and the temperature is started to rise; when the temperature reaches 70°C, a potassium persulfate initiator with a concentration of 0.1 g / ml is added and timing is started, the amount of the initiator is 0.5 wt% to 2 wt% of the monomer, and the reaction liquid is taken out after the polymerization reaction for 6 to 8 hours to obtain a microsphere emulsion, and the stirring rate of the polymerization reaction is 250 to 350 r / min; the microsphere emulsion is centrifuged at 6000 to 10000 rpm for 20 to 30 minutes, the upper clear liquid is removed, the lower paste liquid is taken out, and a silane coupling agent, carbon black, a binder, an anti-film cracking agent and deionized water are added to obtain the photonic crystal liquid color paste.

[0011] The inventors have found that the various additives in the photonic crystal liquid color paste have a significant effect on the regularity and uniformity of the arrangement of the photonic crystal microspheres on the surface of the Raschel blanket. The Raschel blankets prepared with photonic crystal liquid color pastes with different component ratios have great differences in the reflection intensity of light.

[0012] Preferably, in the Raschel blanket having a photonic crystal structure according to the present invention, the monomer is selected from one or more of styrene (St), methyl methacrylate (MMA) and methacrylic acid (MAA).

[0013] Preferably, in the Raschel blanket with photonic crystal structure coloring according to the present invention, the particle size of the microsphere emulsion is 180-300 nm, and the monodispersity index (PDI) is lower than 0.1.

[0014] Preferably, in the Raschel blanket with photonic crystal structure coloring according to the present invention, the content of microspheres in the photonic crystal liquid color paste is 20wt% to 40wt%.

[0015] Preferably, in the Raschel blanket with photonic crystal structure coloring according to the present invention, the carbon black content in the photonic crystal liquid color paste is 0.1wt% to 0.15wt%.

[0016] Preferably, according to the Raschel blanket with photonic crystal structure coloring described in the present invention, in the photonic crystal liquid color paste, the binder is one or more of water-based polyurethane or water-based acrylate, and the amount used is 1wt% to 5wt% based on the photonic crystal liquid color paste.

[0017] Preferably, according to the Raschel blanket with photonic crystal structure coloring described in the present invention, in the photonic crystal liquid color paste, the silane coupling agent is one or more of the hydrophobic fluorine-containing silane coupling agents PFOTMS, PFOTES, and HFTMS, and the amount used is 3wt% to 5wt% based on the photonic crystal liquid color paste.

[0018] Preferably, in the Raschel blanket with photonic crystal structure coloring according to the present invention, the anti-film cracking agent in the photonic crystal liquid color paste is one or more of 1-4 butanediol and isopropanol, and the amount used is 6wt% to 8wt% based on the photonic crystal liquid color paste.

[0019] Preferably, according to the Raschel blanket with photonic crystal structure coloring described in the present invention, the specific process of the air plasma etching treatment is: placing a polyester / acrylic Raschel blanket in a plasma treatment chamber, modulating the output power to 100-300W, and when the pressure reaches 30-50Pa, introducing any one of nitrogen, argon or xenon for 30-60s.

[0020] Preferably, in the Raschel blanket with photonic crystal structure coloring according to the present invention, in the pre-treatment: the drying temperature is 60° C. to 90° C., and the drying time is 20 min to 1 h.

[0021] The present invention also provides a method for preparing a Raschel blanket having a photonic crystal structure, which mainly comprises the following steps:

[0022] (1) Preparation of photonic crystal liquid color paste: nitrogen is introduced into a reaction kettle for 20 to 30 minutes, and then monomers and deionized water are added in turn, with a volume ratio of 1:8 to 1:12 and the temperature is raised; when the temperature reaches 70°C, potassium persulfate initiator with a concentration of 0.1 g / ml is added and timing is started, the amount of initiator used is 0.5 wt% to 2 wt% of the monomer, and the reaction liquid is taken out after the polymerization reaction for 6 to 8 hours to obtain a microsphere emulsion, and the stirring rate of the polymerization reaction is 250 to 350 r / min; the microsphere emulsion is centrifuged at 6000 to 10000 rpm for 20 to 30 minutes, the upper clear liquid is removed, and 20 wt% to 40 wt% of the lower paste liquid is taken out, and 3 wt% to 5 wt% of a silane coupling agent, 0.1 wt% to 0.15 wt% of carbon black, 1 wt% to 5 wt% of a binder, 6 wt% to 8 wt% of a film crack prevention agent and deionized water are added to obtain the photonic crystal liquid color paste,

[0023] (2) Low-temperature plasma pretreatment: First, the polyester / acrylic Raschel blanket is immersed in an anhydrous ethanol solution, then washed and dried; then the polyester / acrylic Raschel blanket is etched by air plasma, then washed and dried.

[0024] (3) Photonic crystal structure color finishing of polyester / acrylic Raschel blanket: Fill the photonic crystal liquid color paste into a spray device, and use the spray device to spray the acrylic yarn on the surface of the Raschel blanket pretreated with low-temperature plasma, with a spray thickness of 60 to 100 μm; place it at 60 to 90° C. for drying to obtain the Raschel blanket with photonic crystal structure color.

[0025] The above steps can produce a Raschel blanket with photonic crystal structure color. In order to make the purpose of the invention, product features and advantages of the present invention more obvious and easy to understand, the present invention will be further described in detail below in conjunction with specific embodiments.

[0026] Preferably, according to the method for preparing a Raschel blanket having a photonic crystal structure color according to the present invention, the monomer in step (1) is selected from one or more of styrene (St), methyl methacrylate (MMA), and methacrylic acid (MAA).

[0027] Preferably, according to the method for preparing a Raschel blanket having a photonic crystal structure color, the particle size of the microsphere emulsion in step (1) is 180 to 300 nm, and the monodispersity index is less than 0.1.

[0028] Preferably, according to the method for preparing a Raschel blanket having a photonic crystal structure color according to the present invention, in the photonic crystal liquid color paste in step (1), the binder is one or more of water-based polyurethane or water-based acrylate.

[0029] Preferably, according to the method for preparing a Raschel blanket having a photonic crystal structure color according to the present invention, in the photonic crystal liquid color paste in step (1), the silane coupling agent is one or more of the hydrophobic fluorinated silane coupling agents PFOTMS, PFOTES, and HFTMS.

[0030] Preferably, according to the method for preparing a Raschel blanket having a photonic crystal structure color according to the present invention, in the photonic crystal liquid color paste in step (1), the anti-film cracking agent is one or more of 1-4-butanediol and isopropanol.

[0031] Preferably, according to the method for preparing a Raschel blanket having a photonic crystal structure color according to the present invention, the specific process of the air plasma etching treatment in the step (2) is as follows: placing the polyester / acrylic Raschel blanket in a plasma treatment chamber, modulating the output power to 100 to 300 W, and when the pressure reaches 30 to 50 Pa, introducing any one of nitrogen, argon or xenon for 30 to 60 seconds.

[0032] Preferably, according to the method for preparing a Raschel blanket having a photonic crystal structure color according to the present invention, in the pretreatment in step (2), the drying temperature is 60° C. to 90° C., and the drying time is 20 min to 1 h.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] (1) The present invention uses a simple spraying method to spray photonic crystal liquid color paste on the surface of the Raschel blanket acrylic yarn to prepare a Raschel blanket with photonic crystal structure color. At the same time, the addition of fluorine-containing silane coupling agent makes the Raschel blanket have good softness and obtains a flexible and changeable visual effect. At the same time, the fluorine-containing silane coupling agent will be deposited in the gaps between acrylic fibers, slowing down the penetration of microspheres into the yarn, thereby effectively self-assembling to form a regular photonic crystal structure.

[0035] (2) The present invention uses water-based polyurethane or water-based acrylate as a binder to form a protective film on the surface of the microspheres, thereby improving the stability of the photonic crystal layer. At the same time, the binder enters the interior of the photonic crystal layer to form bonding points between the microspheres, thereby improving the stability of the photonic crystal layer.

[0036] (3) The present invention reduces the cracking of photonic crystals by adding an anti-crack agent to the photonic crystal color paste, thereby increasing the uniformity and integrity of the photonic crystal structure.

[0037] (4) The present invention uses acrylic fiber as the fleece yarn and polyester fiber as the base yarn to weave a Raschel blanket. After low-temperature air plasma etching treatment, not only the adhesion of the photonic crystal microspheres to the fiber surface is strengthened, but also a large number of hydroxyl and amino hydrophilic groups are introduced into the fiber surface, thereby improving the moisture absorption, breathability and comfort performance of the Raschel blanket.

[0038] (5) The present invention meets the development needs of textiles in the era. The preparation process does not cause wastewater, does not require chemical colorants, is green and pollution-free, and has huge development potential and broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a SEM image of the polystyrene photonic crystal microspheres of Example 3 of the present invention. DETAILED DESCRIPTION

[0040] The following is a more detailed description of the present invention in conjunction with the following embodiments. It should be understood that the implementation of the present invention is not limited to the following embodiments, and any modifications and / or changes made to the present invention will fall within the scope of protection of the present invention.

[0041] In the present invention, unless otherwise specified, all parts and percentages are by weight, and all equipment and raw materials can be purchased from the market or are commonly used in the industry. Unless otherwise specified, the methods used in the embodiments are common techniques in the art.

[0042] Example 1

[0043] A Raschel blanket with photonic crystal structure color is obtained according to the following preparation method:

[0044] (1) Preparation of photonic crystal liquid color paste:

[0045] Nitrogen was introduced into the reactor for 20 minutes, and then styrene and deionized water were added in turn in a volume ratio of 1:10 and the temperature began to rise; when the temperature reached 70°C, 0.1 g / ml potassium persulfate initiator solution was added, the initiator dosage was 1 wt% of the monomer and the timing was started, and the reaction liquid was taken out after 8 hours of polymerization reaction to obtain a microsphere emulsion, and the polymerization reaction stirring rate was 350 r / min; the microsphere emulsion was centrifuged at 6000 rpm for 30 minutes, the upper clear liquid was removed, 30 wt% of the lower paste liquid was taken, 3 wt% PFOTMS, 0.1 wt% carbon black, 1 wt% water-based polyurethane, 6 wt% isopropanol, and deionized water were added to obtain a photonic crystal liquid color paste.

[0046] (2) Low temperature plasma pretreatment:

[0047] The polyester / acrylic Raschel blanket was placed in a plasma treatment chamber, the output power was modulated to 300 W, and when the pressure reached 30 Pa, nitrogen was introduced for 30 seconds.

[0048] (3) Photonic crystal structural color finishing of polyester / acrylic Raschel blanket:

[0049] The photonic crystal liquid color paste is filled in a spray device, and the spray device is used to spray the acrylic yarn of the Raschel blanket treated with low-temperature plasma, with a spray thickness of 80 μm, and then placed in a 60° C. drying to obtain a photonic crystal structured color Raschel blanket.

[0050] Example 2

[0051] A Raschel blanket with photonic crystal structure color is obtained according to the following preparation method:

[0052] (1) Preparation of photonic crystal liquid color paste:

[0053] Nitrogen was introduced into the reactor for 20 minutes, and then styrene and deionized water were added in turn in a volume ratio of 1:10 and the temperature began to rise; when the temperature reached 70°C, 0.1 g / ml potassium persulfate initiator solution was added, the initiator dosage was 1 wt% of the monomer and the timing was started, and the reaction liquid was taken out after 8 hours of polymerization reaction to obtain a microsphere emulsion, and the polymerization reaction stirring rate was 350 r / min; the microsphere emulsion was centrifuged at 6000 rpm for 30 minutes, the upper clear liquid was removed, 30 wt% of the lower paste liquid was taken, 3 wt% PFOTMS, 0.1 wt% carbon black, 1 wt% water-based polyurethane, 6 wt% isopropanol, and deionized water were added to obtain a photonic crystal liquid color paste.

[0054] (2) Low temperature plasma pretreatment:

[0055] The polyester / acrylic Raschel blanket was placed in a plasma treatment chamber, the output power was modulated to 300 W, and when the pressure reached 30 Pa, argon gas was introduced and treated for 30 seconds.

[0056] (3) Photonic crystal structural color finishing of polyester / acrylic Raschel blanket:

[0057] The photonic crystal liquid color paste is filled in a spray device, and the spray device is used to spray the acrylic yarn of the Raschel blanket treated with low-temperature plasma, with a spray thickness of 100 μm. The Raschel blanket is dried at 60° C. to obtain a photonic crystal structured color Raschel blanket.

[0058] Example 3

[0059] A Raschel blanket with photonic crystal structure color is obtained according to the following preparation method:

[0060] (1) Preparation of photonic crystal liquid color paste:

[0061] Nitrogen was introduced into the reactor for 20 minutes, and then styrene and deionized water were added in turn in a volume ratio of 1:10 and the temperature began to rise; when the temperature reached 70°C, 0.1 g / ml potassium persulfate initiator solution was added, the initiator dosage was 1 wt% of the monomer and the timing was started, and the reaction liquid was taken out after 8 hours of polymerization reaction to obtain a microsphere emulsion, and the polymerization reaction stirring rate was 350 r / min; the microsphere emulsion was centrifuged at 6000 rpm for 30 minutes, the upper clear liquid was removed, 40 wt% of the lower paste liquid was taken, 5 wt% PFOTMS, 0.15 wt% carbon black, 5 wt% waterborne polyurethane, 8 wt% isopropanol, and deionized water were added to obtain a photonic crystal liquid color paste.

[0062] (2) Low temperature plasma pretreatment:

[0063] The polyester / acrylic Raschel blanket was placed in a plasma treatment chamber, the output power was modulated to 300 W, and when the pressure reached 30 Pa, xenon gas was introduced and treated for 30 seconds.

[0064] (3) Photonic crystal structural color finishing of polyester / acrylic Raschel blanket:

[0065] The photonic crystal liquid color paste is filled in a spray device, and the spray device is used to spray the acrylic yarn of the Raschel blanket treated with low-temperature plasma, with a spray thickness of 100 μm. The Raschel blanket is dried at 60° C. to obtain a photonic crystal structured color Raschel blanket.

[0066] Example 4

[0067] A Raschel blanket with photonic crystal structure color is obtained according to the following preparation method:

[0068] (1) Preparation of photonic crystal liquid color paste:

[0069] Nitrogen was introduced into the reactor for 20 minutes, and then methyl methacrylate and deionized water were added in turn in a volume ratio of 1:10 and the temperature began to rise; when the temperature reached 70°C, 0.1 g / ml potassium persulfate initiator solution was added, the initiator dosage was 1 wt% of the monomer, and the timing was started. After the polymerization reaction was completed for 8 hours, the reaction liquid was taken out to obtain a microsphere emulsion, and the polymerization reaction stirring rate was 350 r / min; the microsphere emulsion was centrifuged at 6000 rpm for 30 minutes, the upper clear liquid was removed, 40 wt% of the lower paste liquid was taken, 5 wt% PFOTMS, 0.15 wt% carbon black, 5 wt% waterborne polyurethane, 8 wt% isopropanol, and deionized water were added to obtain a photonic crystal liquid color paste.

[0070] (2) Low temperature plasma pretreatment:

[0071] The polyester / acrylic Raschel blanket was placed in a plasma treatment chamber, the output power was modulated to 300 W, and when the pressure reached 30 Pa, nitrogen was introduced for 30 seconds.

[0072] (3) Photonic crystal structural color finishing of polyester / acrylic Raschel blanket:

[0073] The photonic crystal liquid color paste is filled in a spray device, and the spray device is used to spray the acrylic yarn of the Raschel blanket treated with low-temperature plasma, with a spray thickness of 100 μm. The Raschel blanket is dried at 60° C. to obtain a photonic crystal structured color Raschel blanket.

[0074] Example 5

[0075] A Raschel blanket with photonic crystal structure color is obtained according to the following preparation method:

[0076] (1) Preparation of photonic crystal liquid color paste:

[0077] Nitrogen was introduced into the reactor for 20 minutes, and then methacrylic acid and deionized water were added in turn in a volume ratio of 1:10 and the temperature began to rise; when the temperature reached 70°C, 0.1 g / ml potassium persulfate initiator solution was added, the initiator dosage was 1 wt% of the monomer and the timing was started, and the reaction liquid was taken out after 8 hours of polymerization reaction to obtain a microsphere emulsion, and the polymerization reaction stirring rate was 350 r / min; the microsphere emulsion was centrifuged at 6000 rpm for 30 minutes, the upper clear liquid was removed, 40 wt% of the lower paste liquid was taken, 5 wt% PFOTMS, 0.15 wt% carbon black, 5 wt% waterborne polyurethane, 8 wt% isopropanol, and deionized water were added to obtain a photonic crystal liquid color paste.

[0078] (2) Low temperature plasma pretreatment:

[0079] The polyester / acrylic Raschel blanket was placed in a plasma treatment chamber, the output power was modulated to 300 W, and when the pressure reached 30 Pa, nitrogen was introduced for 30 seconds.

[0080] (3) Photonic crystal structural color finishing of polyester / acrylic Raschel blanket:

[0081] The photonic crystal liquid color paste is filled in a spray device, and the spray device is used to spray the acrylic yarn of the Raschel blanket treated with low-temperature plasma, with a spray thickness of 100 μm. The Raschel blanket is dried at 60° C. to obtain a photonic crystal structured color Raschel blanket.

[0082] Comparative Example 1

[0083] A Raschel blanket with photonic crystal structure color is obtained according to the following preparation method:

[0084] (1) Preparation of photonic crystal liquid color paste:

[0085] Nitrogen was introduced into the reactor for 20 minutes, and then styrene and deionized water were added in turn in a volume ratio of 1:10 and the temperature began to rise; when the temperature reached 70°C, 0.1 g / ml potassium persulfate initiator solution was added, the initiator dosage was 1 wt% of the monomer and the timing was started, and the reaction liquid was taken out after 8 hours of polymerization reaction to obtain a microsphere emulsion, and the polymerization reaction stirring rate was 350 r / min; the microsphere emulsion was centrifuged at 6000 rpm for 30 minutes, the upper clear liquid was removed, 20 wt% of the lower paste liquid was taken, 3 wt% PFOTMS, 0.1 wt% carbon black, 1 wt% water-based polyurethane, 6 wt% isopropanol, and deionized water were added to obtain a photonic crystal liquid color paste.

[0086] (2) Low temperature plasma pretreatment:

[0087] The polyester / acrylic Raschel blanket was placed in a plasma treatment chamber, the output power was modulated to 300 W, and when the pressure reached 30 Pa, nitrogen was introduced for 30 seconds.

[0088] (3) Photonic crystal structural color finishing of polyester / acrylic Raschel blanket:

[0089] The photonic crystal liquid color paste is filled in a spray device, and the spray device is used to spray the acrylic yarn of the Raschel blanket treated with low-temperature plasma, with a spray thickness of 60 μm, and then placed in a 60° C. drying to obtain a photonic crystal structured color Raschel blanket.

[0090] Comparative Example 2

[0091] A Raschel blanket with photonic crystal structure color is obtained according to the following preparation method:

[0092] (1) Preparation of photonic crystal liquid color paste:

[0093] Nitrogen was introduced into the reactor for 20 minutes, and then styrene and deionized water were added in turn in a volume ratio of 1:10 and the temperature began to rise; when the temperature reached 70°C, 0.1 g / ml potassium persulfate initiator solution was added, the initiator dosage was 1 wt% of the monomer and the timing was started, and the reaction liquid was taken out after 8 hours of polymerization reaction to obtain a microsphere emulsion, and the polymerization reaction stirring rate was 350 r / min; the microsphere emulsion was centrifuged at 6000 rpm for 30 minutes, the upper clear liquid was removed, 30 wt% of the lower paste liquid was taken, 3 wt% PFOTMS, 0.1 wt% carbon black, 1 wt% water-based polyurethane, 6 wt% isopropanol, and deionized water were added to obtain a photonic crystal liquid color paste.

[0094] (2) Low temperature plasma pretreatment:

[0095] The polyester / acrylic Raschel blanket was placed in a plasma treatment chamber, the output power was modulated to 300 W, and when the pressure reached 30 Pa, nitrogen was introduced for 30 seconds.

[0096] (3) Photonic crystal structural color finishing of polyester / acrylic Raschel blanket:

[0097] The photonic crystal liquid color paste is filled in a spray device, and the spray device is used to spray the acrylic yarn of the Raschel blanket treated with low-temperature plasma, with a spray thickness of 60 μm, and then placed in a 60° C. drying to obtain a photonic crystal structured color Raschel blanket.

[0098] Comparative Example 3

[0099] A Raschel blanket with photonic crystal structure color is obtained according to the following preparation method:

[0100] (1) Preparation of photonic crystal liquid color paste:

[0101] Nitrogen was introduced into the reactor for 20 minutes, and then styrene and deionized water were added in turn in a volume ratio of 1:10 and the temperature began to rise; when the temperature reached 70°C, 0.1 g / ml potassium persulfate initiator solution was added, the initiator dosage was 1 wt% of the monomer and the timing was started, and the reaction liquid was taken out after 8 hours of polymerization reaction to obtain a microsphere emulsion, and the polymerization reaction stirring rate was 350 r / min; the microsphere emulsion was centrifuged at 6000 rpm for 30 minutes, the upper clear liquid was removed, 40 wt% of the lower paste liquid was taken, 3 wt% PFOTMS, 0.1 wt% carbon black, 1 wt% waterborne polyurethane, 6 wt% isopropanol, and deionized water were added to obtain a photonic crystal liquid color paste.

[0102] (2) Low temperature plasma pretreatment:

[0103] The polyester / acrylic Raschel blanket was placed in a plasma treatment chamber, the output power was modulated to 300 W, and when the pressure reached 30 Pa, nitrogen was introduced for 30 seconds.

[0104] (3) Photonic crystal structural color finishing of polyester / acrylic Raschel blanket:

[0105] The photonic crystal liquid color paste is filled in a spray device, and the spray device is used to spray the acrylic yarn of the Raschel blanket treated with low-temperature plasma, with a spray thickness of 60 μm, and then placed in a 60° C. drying to obtain a photonic crystal structured color Raschel blanket.

[0106] Comparative Example 4

[0107] Comparative Example 4 is a polyester / acrylic Raschel blanket that has not been treated in any way. There is no photonic crystal on its surface, so it does not show any structural color, and the reflectivity intensity is only 20%.

[0108] Table 1 Example formula table

[0109]

[0110] Note: Examples 1 to 3 and Comparative Examples 1 to 3 all use PSt microspheres with an average particle size of 240 nm and a PDI of 0.044; Example 4 uses PMMA microspheres with an average particle size of 222 nm and a PDI of 0.035; Example 5 uses PMAA microspheres with an average particle size of 254 nm and a PDI of 0.024.

[0111] Table 2 Performance table of the embodiment

[0112] Photonic crystal flatness Particle phenomenon Reflectivity intensity (%) Example 1 better middle 52 Example 2 better few 55 Example 3 good Very rare 66 Example 4 good Very rare 63 Example 5 good Very rare 65 Comparative Example 1 Difference many 32 Comparative Example 2 Poor More 40 Comparative Example 3 middle middle 44 Comparative Example 4 none none 20

[0113] The Raschel blanket with photonic crystal structure coloring of the present invention has excellent photonic crystal coloring characteristics, thereby achieving bright colors under sunlight, flexible and changeable visual effects, and the production process is green and environmentally friendly, low cost, and good durability. In addition, when the amount of photonic crystal paste is 40wt%, the amount of PFOTMS is 5wt%, the amount of carbon black is 0.15wt%, the amount of waterborne polyurethane is 5wt%, the amount of isopropanol is 8wt%, and the spraying thickness is 100μm, the photonic crystal has good flatness and very few particles on the surface of the blanket, and the reflectivity peak can reach 65%, which is much better than comparative examples 1 to 4.

[0114] References:

[0115] [1] Chai Liqin et al. Study on the stability of the photonic crystals under different application environments and the possible mechanisms [J]. J. Text. Inst. 2 (110): 234-242.

[0116] [2] Liu Guojin et al. A yarn with photonic crystal structural color and its use: 113897789B[P]. 2023-10-20.

[0117] [3] Shao Jianzhong et al. A photonic crystal structure color-producing fabric and its preparation method: 112323495B[P]. 2022-9-27.

Claims

1. A Raschel blanket having a photonic crystal structure, characterized in that: The invention comprises using acrylic fiber as pile yarn and polyester as base yarn, weaving a polyester / acrylic Raschel blanket on a double needle bed Raschel warp knitting machine, and then performing a photonic crystal liquid color paste spraying process after pre-treatment to obtain the Raschel blanket with photonic crystal structure color, wherein: The pre-treatment is as follows: firstly, the polyester / acrylic Raschel blanket is subjected to air plasma etching, then washed and dried. The photonic crystal liquid color paste is prepared according to the following method: Nitrogen is introduced into the reaction kettle for 20 to 30 minutes, and then monomers and deionized water are added in sequence in a volume ratio of 1:8 to 1:12 and the temperature is started to rise; when the temperature reaches 70°C, a potassium persulfate initiator with a concentration of 0.1 g / ml is added and timing is started, the amount of the initiator is 0.5 wt% to 2 wt% of the monomer, and the reaction liquid is taken out after the polymerization reaction for 6 to 8 hours to obtain a microsphere emulsion, and the stirring rate of the polymerization reaction is 250 to 350 r / min; the microsphere emulsion is centrifuged at 6000 to 10000 rpm for 20 to 30 minutes, the upper clear liquid is removed, the lower paste liquid is taken out, and a silane coupling agent, carbon black, a binder, an anti-film cracking agent and deionized water are added to obtain the photonic crystal liquid color paste.

2. The Raschel blanket having a photonic crystal structure color according to claim 1, characterized in that: The monomer is selected from one or more of styrene (St), methyl methacrylate (MMA), and methacrylic acid (MAA).

3. The Raschel blanket having a photonic crystal structure color according to claim 1, characterized in that: The particle size of the microsphere emulsion is 180-300 nm, and the monodispersity index (PDI) is lower than 0.

1.

4. The Raschel blanket having a photonic crystal structure color according to claim 1, characterized in that: The microsphere content in the photonic crystal liquid color paste is 20wt% to 40wt%; the carbon black content is 0.1wt% to 0.15wt%; the binder is one or more of waterborne polyurethane or waterborne acrylate, and the amount used is 1wt% to 5wt%; the silane coupling agent is one or more of hydrophobic fluorine-containing silane coupling agents PFOTMS, PFOTES, and HFTMS, and the amount used is 3wt% to 5wt%; the anti-film cracking agent is one or more of 1-4 butanediol and isopropanol, and the amount used is 6wt% to 8wt%.

5. The Raschel blanket having a photonic crystal structure color according to claim 1, characterized in that: The specific process of the air plasma etching treatment is as follows: placing the polyester / acrylic Raschel blanket in a plasma treatment chamber, modulating the output power to 100-300W, and when the pressure reaches 30-50Pa, introducing any one of nitrogen, argon or xenon for 30-60s.

6. The Raschel blanket having a photonic crystal structure color according to claim 1, characterized in that: In the pre-treatment, the drying temperature is 60°C to 90°C, and the drying time is 20min to 1h.

7. A method for preparing a Raschel blanket having a photonic crystal structure, characterized in that: The main steps include: (1) Preparation of photonic crystal liquid color paste: nitrogen is introduced into a reaction kettle for 20 to 30 minutes, and then monomers and deionized water are added in turn, with a volume ratio of 1:8 to 1:12 and the temperature is raised; when the temperature reaches 70°C, potassium persulfate initiator with a concentration of 0.1 g / ml is added and timing is started, the amount of initiator used is 0.5 wt% to 2 wt% of the monomer, and the reaction liquid is taken out after the polymerization reaction for 6 to 8 hours to obtain a microsphere emulsion, and the stirring rate of the polymerization reaction is 250 to 350 r / min; the microsphere emulsion is centrifuged at 6000 to 10000 rpm for 20 to 30 minutes, the upper clear liquid is removed, and 20 wt% to 40 wt% of the lower paste liquid is taken out, and 3 wt% to 5 wt% of a silane coupling agent, 0.1 wt% to 0.15 wt% of carbon black, 1 wt% to 5 wt% of a binder, 6 wt% to 8 wt% of a film crack prevention agent and deionized water are added to obtain the photonic crystal liquid color paste, (2) Low-temperature plasma pretreatment: First, the polyester / acrylic Raschel blanket is immersed in an anhydrous ethanol solution, then washed and dried; then the polyester / acrylic Raschel blanket is etched by air plasma, then washed and dried. (3) Photonic crystal structure color finishing of polyester / acrylic Raschel blanket: Fill the photonic crystal liquid color paste into a spray device, and use the spray device to spray the acrylic yarn on the surface of the Raschel blanket pretreated with low-temperature plasma, with a spray thickness of 60 to 100 μm; place it at 60 to 90° C. for drying to obtain the Raschel blanket with photonic crystal structure color.

8. The method for preparing a Raschel blanket having a photonic crystal structure color according to claim 7, characterized in that: The monomer in the step (1) is selected from one or more of styrene (St), methyl methacrylate (MMA), and methacrylic acid (MAA); the particle size of the microsphere emulsion is 180-300nm, and the monodispersity index (PDI) is less than 0.1; the binder is one or more of water-based polyurethane or water-based acrylate; the silane coupling agent is one or more of hydrophobic fluorine-containing silane coupling agents PFOTMS, PFOTES, and HFTMS; and the anti-film cracking agent is one or more of 1-4 butanediol and isopropanol.

9. The method for preparing a Raschel blanket having a photonic crystal structure color according to claim 7, characterized in that: The specific process of the air plasma etching treatment in step (2) is as follows: placing the polyester / acrylic Raschel blanket in a plasma treatment chamber, modulating the output power to 100-300W, and when the pressure reaches 30-50Pa, introducing any one of nitrogen, argon or xenon for 30-60s.

10. The method for preparing a Raschel blanket having a photonic crystal structure color according to claim 7, characterized in that: In the pretreatment in step (2), the drying temperature is 60°C to 90°C, and the drying time is 20 minutes to 1 hour.

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