Shell coloring process for correcting insole to change mechanics

Abstract

The invention discloses an orthotic insole shell coloring process for changing mechanics, and relates to the technical field of orthotic insole preparation. A shell coloring process for correcting insole mechanical change comprises shell pretreatment, coloring coating preparation, coloring treatment and protective layer treatment, and specifically comprises the steps that the surface of a to-be-treated shell is coated with a light-cured coloring coating prepared by mixing pigment filler and light-cured resin and UV gloss oil, curing is conducted through ultraviolet irradiation, and the shell to be treated is obtained. The cured coloring coating not only can color the surface of the shell, but also can improve the hardness of the shell by being matched with the gloss oil protection layer. Therefore, under the condition of the same overall thickness, the processed shell can have higher bearing capacity and durability; and under the same compression modulus and bearing capacity, the correction insole shell can be thinner and lighter through the treatment of the coloring process, so that the overall weight of the correction insole is reduced, and the comfort of the correction insole is improved.

Description

Technical Field

[0001] The present invention relates to the field of color finding in the production of corrective insoles, and in particular to a coloring process for the outer shell of a corrective insole that changes mechanics Background Art

[0002] The foot is the foundation of the human body, but due to incorrect walking and running postures in daily life, wearing inappropriate shoes or certain congenital genetic factors, it usually causes damage to the ligaments of the foot or deformation of the bones, leading to the formation of abnormal gait or pathological gait, which seriously affects people's health. In addition, the legs are also important organs of the human body. The legs support the body and enable people to stand easily and comfortably. However, due to foot defects, incorrect standing postures and genetic factors, X-shaped legs, O-shaped legs, XO-shaped legs, etc. usually appear, which not only affects people's appearance, but also affects people's health.

[0003] In order to correct abnormal gait and leg bones, corrective shoes with a certain mechanical strength are currently used to correct the feet and legs. The strength of the corrective insole is used to support the user's feet, so as to adjust the gait and leg bones during daily walking and exercise to a normal position, thereby reducing or avoiding the damage to human health caused by abnormal gait and leg bones.

[0004] Among them, the general corrective insole is mainly composed of a cushion body and a shell, wherein the main supporting performance of the corrective insole comes from the shell, and the shell of the corrective insole is generally made of plastic. As the structural strength and rigidity of the shell are higher, the supporting performance of the corrective insole is better. In order to make the shell itself have a structural strength sufficient to support and correct the user, the most direct method is to add reinforcing fillers to the raw materials to change the rigidity of the raw materials themselves from the production and preparation of the shell. However, when the reinforcing filler content in the shell is higher, the brittleness of the shell also increases, and it is easier to be damaged during use and difficult to use for a long time. Therefore, at present, it is generally adopted to keep the shell formula raw materials unchanged, directly increase the thickness of the shell or change the three-dimensional pit groove of the shell to improve the structural strength and rigidity of the shell, so that it can maintain the characteristics of certain toughness and low brittleness, and at the same time improve its structural strength and rigidity, but the above two methods not only have a low degree of improvement, the structural strength and rigidity of the shell are not greatly improved, and the shell will become very thick, so that the overall weight distribution of the corrective insole is uneven, and the user is uncomfortable to wear. Summary of the invention

[0005] In order to improve the mechanical strength of the shell of the corrective insole so that the shell has excellent load-bearing strength while also maintaining a relatively thin overall thickness, the present application provides a shell coloring process for changing the mechanics of the corrective insole.

[0006] In the first aspect, the present application provides a corrective insole for changing the mechanical shell coloring process using the following technical solutions: A shell coloring process for changing the mechanics of an orthotic insole comprises the following steps: S1. Shell pretreatment: first, soak the outer shell of the corrective insole in an alkaline detergent, then rinse it with deionized water for multiple times and then dry it to obtain a shell to be treated; S2. Preparation of coloring paint: fully mix the pigment and filler with the photocurable resin, reactive diluent, photoinitiator and other filler additives, and prepare the photocurable coloring paint; S3, coloring treatment: applying the light-curing coloring paint to the surface of the shell to be treated by spraying in a light-proof state, and then irradiating the surface of the shell to be treated with ultraviolet light evenly under nitrogen protection, so that the light-curing coloring paint is cured and a coloring coating is formed on the shell surface, thereby obtaining a corrective insole shell with a coloring coating; S4, protective layer treatment: spray a thin layer of UV varnish on the surface of the color coating, then heat and irradiate the surface evenly with ultraviolet light under the protection of nitrogen, so that the UV varnish is fully cured and forms a varnish protective layer on the surface of the color coating, thereby completing the coloring of the shell of the corrective insole.

[0007] By adopting the above technical scheme, a photocurable coloring coating mixed with pigments and photocurable resins is sprayed on the surface of the shell. After the photocurable coloring coating is irradiated by ultraviolet light and fully cured to form a coloring coating, not only can the surface coloring of the corrective insole shell be completed, but also the varnish protective layer after UV varnish is cured can significantly improve the surface hardness and surface gloss of the shell. Under the same overall thickness, it is beneficial to improve the compression modulus of the shell, so that the corrective insole shell has a higher load-bearing capacity and durability. Similarly, under the same compression modulus and load-bearing capacity, the corrective insole shell can also be made thinner and lighter through the coloring process, which is beneficial to reduce the overall weight of the corrective insole and improve the comfort of the corrective insole. In addition, the corrective insole shell can also achieve local reinforcement of the shell and change the local mechanical properties by forming a coloring coating and a varnish protective layer in different areas, which is beneficial to improve the bearing capacity of the specific correction area of ​​the corrective insole.

[0008] Optionally, the photocurable color coating comprises the following raw materials in parts by weight: Light-curing resin: 50-60 parts; Active diluent: 15-22 parts; Photoinitiator: 8-10 parts; Light stabilizer: 0.2-0.4 parts; Hydroxy silicone oil: 4-12 parts; Polyvinyl alcohol: 5-8 parts; Dispersant: 5-7.5 parts; Reinforcing filler: 5-8 parts; Color and filler: 1-1.2 parts; The photocurable resin is a mixture of epoxy acrylate resin and polyurethane acrylate in a weight ratio of 1:(0.5-1).

[0009] By adopting the above technical scheme, epoxy acrylate resin generally has higher hardness and strength due to its epoxy group, and polyurethane acrylate has good adhesion. When epoxy acrylate resin and polyurethane acrylate resin are compounded with each other to form a light-curing color coating, the mechanical strength of the color coating formed after curing and the adhesion performance on the shell can be improved, which is conducive to the light-curing color coating to fully play the role of hardening and reinforcing. Only a thin layer needs to be sprayed on the surface of the shell to make the shell have excellent bearing strength and keep the shell with a thin overall thickness.

[0010] Optionally, in the photocurable resin, the epoxy acrylate resin used includes bisphenol A epoxy acrylate and epoxidized oil acrylate, and the bisphenol A epoxy acrylate and the epoxidized oil acrylate are mixed and compounded in a weight ratio of 1:(0.1-0.25).

[0011] By adopting the above technical scheme, adding a small amount of epoxidized soybean oil acrylate to the photocurable resin is beneficial to improving the hardness and bonding ability of the colored coating formed after the photocurable colored coating is cured, so that a corrective insole shell with excellent comprehensive performance can be produced in combination with the shell and the varnish protective layer.

[0012] Optionally, the active diluent is a mixture of three materials: ethyl carbamate, 1,6-hexanediol dipropionate and ethoxylated trimethylolpropane triacrylate, and the mixing weight ratio of the ethyl carbamate, the 1,6-hexanediol dipropionate and the ethoxylated trimethylolpropane triacrylate is 1:(0.6-0.75):(0.25-0.6).

[0013] By adopting the above technical scheme, when the mixing weight ratio of urethane, 1,6-hexanediol dipropionate and ethoxylated trimethylolpropane triacrylate in the reactive diluent is within the range of 1:(0.6-0.75):(0.25-0.6), the coating viscosity of the light-curable coloring coating can be reduced, the fluidity and construction performance of the light-curable coloring coating can be improved, and the shrinkage of the coloring coating can be reduced, and cracking and wrinkling can be prevented. Secondly, both 1,6-hexanediol dipropionate and ethoxylated trimethylolpropane triacrylate contain acrylate groups, and can also participate in the photocuring reaction as photoinitiator monomers, which can accelerate the initiation efficiency and curing speed of the colored light-curable coloring coating.

[0014] Optionally, the photoinitiator is phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, and the light stabilizer is a mixture of ultraviolet absorber UV-P and light stabilizer UV-770 in a weight ratio of 1:(0.15-0.2).

[0015] By adopting the above technical scheme, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide has excellent absorption performance, which can fully initiate the curing of the colored light-cured coloring coating after mixing with the pigment filler; and the ultraviolet absorber UV-P can inhibit the absorption of ultraviolet light by phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, so that the light-cured coloring coating can be stably cured under ultraviolet light, and at the same time can reduce the thermal effect during curing, and prevent the coloring coating from being affected by overheating; in addition, the light stabilizer UV-770, as a light stabilizer of hindered amines, can capture the free radicals generated during cross-linking polymerization, and properly control the amount of free radicals generated in the system, thereby reducing the explosion of the light-cured resin under ultraviolet light, so that the coloring coating can be stably and evenly cured. In summary, by using phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, ultraviolet absorber UV-P, and light stabilizer UV-770 to form a light-curing initiation system, it is beneficial to improve the comprehensive performance of the coloring coating.

[0016] Optionally, the polyvinyl alcohol resin is further modified with ethyl acetoacetate, and the ethyl acetoacetate modification of the polyvinyl alcohol resin comprises the following steps: First, polyvinyl alcohol is added to dimethyl sulfoxide, the temperature is increased to 95-98°C and the stirring is continued to make the polyvinyl alcohol fully dissolved, then an inert gas is continuously introduced into the container and the stirring is continued, ethyl acetoacetate is added, the temperature is increased to 105-115°C, the reaction is continued with stirring and the by-product ethanol is evaporated, after the reaction is completed, the remaining solution is added to methanol for precipitation, filtered and dried to obtain polyvinyl alcohol modified with ethyl acetoacetate.

[0017] By adopting the above technical scheme, acetoacetyl groups can be introduced into the polyvinyl alcohol chain segments and the water resistance of polyvinyl alcohol can be improved, thereby effectively inhibiting the hygroscopicity of polyurethane acrylate in the photocurable resin and reducing the influence of water vapor on the curing of the photocurable coloring coating. Secondly, the introduction of acetoacetyl groups can also improve the reactivity of polyvinyl alcohol, so that it can undergo cross-linking reactions with other active groups in the system, so that the cross-linking density and bonding strength of the coloring coating are further improved, which is beneficial to improving the hardness and bonding performance of the coloring coating and improving the overall compression modulus of the shell.

[0018] Optionally, the dispersant is any one of TEGO-610S or TEGO-655, the reinforcing filler is at least one of nano calcium carbonate, talcum powder, mica powder, and barium sulfate; and the color filler is an inorganic pigment.

[0019] By adopting the above technical solution, using any one of the dispersants TEGO-610S or TEGO-655 can effectively reduce the surface energy of the inorganic reinforcing filler and the inorganic pigment filler, prevent the inorganic reinforcing filler and the inorganic pigment filler from agglomerating, and help improve the dispersibility and stability of the inorganic reinforcing filler and the inorganic pigment filler in the photocurable resin, thereby preventing the color coating from floating or blooming.

[0020] Optionally, the method for preparing the light-curable colored coating comprises the following steps: A1. Fully mix the photocurable resin, active diluent and light stabilizer to obtain masterbatch A; take 10% of the masterbatch A and mix it with polyvinyl alcohol, hydroxy silicone oil, dispersant, reinforcing filler and pigment filler, and perform ball milling to obtain masterbatch B; A2. Fully mix the remaining masterbatch A and masterbatch B, heat to 110-135°C and continue stirring for 1-2 hours, and obtain a photocurable coloring preparatory material after cooling, and then add a photoinitiator to the photocurable coloring preparatory material in a light-proof state, and keep stirring at room temperature for 20-30 minutes to obtain a photocurable coloring coating, which needs to be stored in a light-proof state.

[0021] By adopting the above technical solution, the surface activity of reinforcing fillers and pigments can be improved in advance through dispersants, and the grinding efficiency of reinforcing fillers and pigments can be improved, so that when heated and mixed, each filler additive can be fully mixed with the photocurable resin, which is beneficial to improving the uniformity of the dispersion performance of each raw material in the photocurable coloring paint. Secondly, the process of mixing and storing in the dark can also prevent the ultraviolet light of natural light from naturally triggering the reaction of the photocurable coloring paint, which is beneficial to maintaining the effectiveness of the photocurable coloring paint.

[0022] Optionally, in the ball milling process, the ball milling speed is set to 1500-2000 r / min, and the ball milling needs to be ground to a fineness of ≤12 μm.

[0023] By adopting the above technical solution, the light-curing coloring paint is ground to a fineness of ≤12μm. The light-curing paint not only has better fluidity and can form a uniform coating when sprayed, which is beneficial to improving the clarity and color uniformity of the coloring coating, but also can penetrate well into the microscopic pores on the surface of the shell, improving the adhesion between the coloring coating and the shell. Secondly, the coloring coating structure formed by the light-curing coloring paint with a smaller fineness after curing can be more compact, which is beneficial to improving the overall hardness of the coloring coating, thereby cooperating with the varnish protective layer to improve the compression modulus of the corrective insole shell, so that the corrective insole shell of the same thickness has a higher load-bearing capacity.

[0024] Optionally, in the step S3 of coloring treatment and S4 of protective layer treatment, the irradiation wavelength of ultraviolet light is controlled within the range of 365-370 nm, the irradiation distance is maintained at 200-300 mm, and the irradiation time is 60-90 s.

[0025] By adopting the above technical solution, the long-wave ultraviolet light band is used to irradiate the photocurable coloring paint or UV varnish, which can fully penetrate the colored and opaque photocurable coloring paint, achieve deep curing of the colored paint and improve the curing efficiency, and can also make the UV varnish fully cure and harden, thereby improving the surface hardness of the shell.

[0026] In summary, the technical solution of this application has at least one of the following beneficial effects: 1. By combining pigments and fillers with photocurable resin to prepare a photocurable coloring paint, the paint is fully cured under ultraviolet light to form a coloring coating on the surface of the shell of the corrective insole. Not only can the surface of the corrective insole shell be colored, but the cured coloring coating combined with the varnish protective layer can significantly improve the overall hardness and surface gloss of the shell, making the shell have a higher load-bearing capacity.

[0027] 2. Under the same overall thickness, the shell treated with the coloring process can have higher load-bearing capacity and durability; and under the same compression modulus and load-bearing capacity, the corrective insole shell can also be made thinner and lighter through the coloring process, which is beneficial to reduce the overall weight of the corrective insole and improve the comfort of the corrective insole.

[0028] 3. By adding a small amount of epoxidized soybean oil acrylate to the photocurable resin, the hardness and bonding ability of the colored coating formed after the photocurable colored coating is cured can be improved, so that the colored coating, the shell and the varnish protective layer can be used to prepare a corrective insole shell with excellent comprehensive performance.

[0029] 4. The photocuring initiation system is formed by using phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide in combination with UV absorber UV-P and light stabilizer UV-770, which is beneficial to further improve the comprehensive performance of the colored coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of a corrective insole shell in Example 1 of the present application.

[0031] Figure 2 It is a cross-sectional view of the shell after being processed by the coloring process in Example 1 of the present application.

[0032] Description of reference numerals: 1. Shell; 11. Shell; 12. Color coating; 13. Varnish protective layer. DETAILED DESCRIPTION

[0033] The present application is further described in detail below in conjunction with the accompanying drawings, preparation examples, embodiments and comparative examples.

[0034] Preparation Example [Preparation Example 1] A photocurable coloring paint comprises the following raw materials in parts by weight: 60 kg of photocurable resin, 22 kg of reactive diluent, 10 kg of photoinitiator, 0.4 kg of light stabilizer, 4 kg of hydroxy silicone oil, 8 kg of polyvinyl alcohol, 5 kg of dispersant, 8 kg of reinforcing filler and 1.2 kg of color filler.

[0035] The photocurable resin is a mixture of bisphenol A epoxy acrylate and polyurethane acrylate in a weight ratio of 1:0.5, that is, the added amount of bisphenol A epoxy acrylate is 40 kg, and the added amount of polyurethane acrylate is 20 kg.

[0036] Among them, the active diluent is ethyl carbamate, 1,6-hexanediol dipropionate and ethoxylated trimethylolpropane triacrylate mixed in a weight ratio of 1:0.6:0.6, that is, the added amount of ethyl carbamate is 10kg, the added amount of 1,6-hexanediol dipropionate is 6kg, and the added amount of ethoxylated trimethylolpropane triacrylate is 6kg.

[0037] The photoinitiator is phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide; the light stabilizer is UV absorber UV-P. The dispersant is TEGO Dispers 610s wetting dispersant; the reinforcing filler includes 3kg nano calcium carbonate, 2kg talcum powder, 0.5kg mica powder and 2.5kg barium sulfate; the color filler is inorganic pigment, specifically carbon black.

[0038] A method for preparing a light-curable colored coating comprises the following steps: A1. Fully mix the photocurable resin, reactive diluent and light stabilizer to obtain masterbatch A; take 10% of the masterbatch A and fully mix it with polyvinyl alcohol, hydroxy silicone oil, dispersant, reinforcing filler and pigment filler, and perform ball milling treatment, wherein the ball milling speed is set to 2000r / min, until the grinding fineness reaches ≤12μm, to obtain masterbatch B; A2. Fully mix the remaining masterbatch A and masterbatch B, heat to 135°C and continue stirring for 1 hour, and obtain a light-curing coloring preparatory material after cooling; add a photoinitiator to the light-curing coloring preparatory material in a light-proof state, and keep stirring at room temperature for 5 minutes to obtain a light-curing coloring coating, which needs to be stored in a light-proof state.

[0039] [Preparation Example 2] A photocurable coloring paint comprises the following raw materials in parts by weight: 50 kg of photocurable resin, 16 kg of reactive diluent, 5 kg of photoinitiator, 0.2 kg of light stabilizer, 12 kg of hydroxy silicone oil, 5 kg of polyvinyl alcohol, 7.5 kg of dispersant, 5 kg of reinforcing filler and 1 kg of color filler.

[0040] The photocurable resin is a mixture of bisphenol A epoxy acrylate, epoxidized oil acrylate and polyurethane acrylate in a weight ratio of 1:0.25:1.25, that is, the addition amount of bisphenol A epoxy acrylate is 20kg, the addition amount of epoxidized oil acrylate is 5kg, and the addition amount of polyurethane acrylate is 25kg. Specifically, the epoxidized oil acrylate is epoxidized soybean oil acrylate.

[0041] Among them, the active diluent is ethyl carbamate, 1,6-hexanediol dipropionate and ethoxylated trimethylolpropane triacrylate mixed in a weight ratio of 1:0.75:0.25, that is, the added amount of ethyl carbamate is 8kg, the added amount of 1,6-hexanediol dipropionate is 6kg, and the added amount of ethoxylated trimethylolpropane triacrylate is 2kg.

[0042] Among them, the photoinitiator is phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide; the light stabilizer is a mixture of ultraviolet absorber UV-P and light stabilizer UV-770 in a weight ratio of 1:0.15, that is, the addition amount of ultraviolet absorber UV-P is 0.174 kg, and the addition amount of light stabilizer UV-770 is 0.026 kg.

[0043] The dispersant is TEGO Dispers 655 wetting dispersant; the reinforcing filler includes 2kg of nano calcium carbonate, 1kg of talcum powder, and 2kg of barium sulfate; the color filler is an inorganic pigment, specifically carbon black.

[0044] A method for preparing a light-curable colored coating comprises the following steps: A1. Fully mix the photocurable resin, reactive diluent and light stabilizer to obtain masterbatch A; take 10% of the masterbatch A and fully mix it with polyvinyl alcohol, hydroxy silicone oil, dispersant, reinforcing filler and pigment filler, and perform ball milling treatment, wherein the ball milling speed is set to 1500r / min, until the grinding fineness reaches ≤12μm, to obtain masterbatch B; A2. Fully mix the remaining masterbatch A and masterbatch B, heat to 120°C and continue stirring for 2 hours, and obtain a light-curing coloring preparatory material after cooling; add a photoinitiator to the light-curing coloring preparatory material in a light-proof state, and keep stirring at room temperature for 10 minutes to obtain a light-curing coloring coating, which needs to be stored in a light-proof state.

[0045] [Preparation Example 3] A photocurable coloring paint, which differs from [Preparation Example 1] in that the photocurable resin is different.

[0046] In this preparation example, the photocurable resin is replaced by a compound mixture of bisphenol A epoxy acrylate, epoxidized oil acrylate and polyurethane acrylate in equal amounts. Specifically, the total ratio of epoxy acrylate resin to polyurethane acrylate remains unchanged, and part of the bisphenol A epoxy acrylate is replaced by epoxidized oil acrylate in equal amounts, wherein the weight ratio of bisphenol A epoxy acrylate to epoxidized oil acrylate is 1:0.1, that is, the addition amount of bisphenol A epoxy acrylate is 36.36 kg, the addition amount of epoxidized oil acrylate is 3.64 kg, and the addition amount of polyurethane acrylate is 20 kg. Specifically, the epoxidized oil acrylate is specifically selected from epoxidized soybean oil acrylate.

[0047] [Preparation Example 4] A photocurable coloring paint, which differs from [Preparation Example 3] in that the photocurable resin is different.

[0048] In this preparation example, the proportions of bisphenol A epoxy acrylate and epoxidized oil acrylate in the epoxy acrylate resin are different. Among them, the weight ratio of bisphenol A epoxy acrylate and epoxidized oil acrylate is 1:0.25, that is, the addition amount of bisphenol A epoxy acrylate is 32kg, the addition amount of epoxidized oil acrylate is 8kg, and the addition amount of polyurethane acrylate is 20kg. Specifically, the epoxidized oil acrylate is specifically selected from epoxidized soybean oil acrylate.

[0049] [Preparation Example 5] A photocurable coloring coating, which differs from [Preparation Example 3] in that the light stabilizer is different.

[0050] In this preparation example, the light stabilizer is replaced by an equal amount of a mixture of an ultraviolet absorber UV-P and a light stabilizer UV-770. Specifically, the total amount of light stabilizer added remains unchanged, and the ultraviolet absorber UV-P and the light stabilizer UV-770 are mixed and compounded at a weight ratio of 1:0.2, that is, the amount of ultraviolet absorber UV-P added is 0.333 kg, and the amount of light stabilizer UV-770 added is 0.067 kg.

[0051] [Preparation Example 6] A photocurable coloring coating, which differs from [Preparation Example 5] in that the polyvinyl alcohol is different.

[0052] In this preparation example, polyvinyl alcohol is further modified with ethyl acetoacetate before mixing, and some acetoacetyl groups are introduced into the polyvinyl alcohol. Specifically, the ethyl acetoacetate modification of polyvinyl alcohol includes the following steps: First, 10 kg of polyvinyl alcohol is added to 30 kg of dimethyl sulfoxide, the temperature is increased to 95°C and stirred continuously to fully dissolve the polyvinyl alcohol to obtain a polyvinyl alcohol solution, the polyvinyl alcohol solution is transferred to a container capable of being evaporated, nitrogen is continuously introduced into the container and stirred continuously, and then ethyl acetoacetate is added, wherein the molar ratio of polyvinyl alcohol resin to ethyl acetoacetate is 1:0.6, the temperature is increased to 110°C, the reaction is continuously stirred and the by-product ethanol is evaporated, and after the reaction is completed, the remaining solution is added to anhydrous methanol for precipitation, filtered and dried to obtain polyvinyl alcohol modified with ethyl acetoacetate.

[0053] [Preparation Example 7] A photocurable coloring coating, which differs from [Preparation Example 1] in that no light stabilizer is added. Example

[0054] [Example 1] A corrective insole shell includes a shell 11, a colored coating 12 coated on the surface of the shell 11, and a varnish protective layer 13 coated on the surface of the colored coating 12, wherein the colored coating 12 and the varnish protective layer 13 are formed by the shell 11 after being treated with a shell coloring process that changes the mechanics of the corrective insole.

[0055] A shell coloring process for changing the mechanics of an orthotic insole comprises the following steps: S1, pretreatment of the shell 1: first, immerse the corrective insole shell 1 with an overall thickness of 2.8 mm in sodium dodecyl sulfate to fully remove the oil stains on the surface of the shell 1, then rinse it with deionized water for multiple times and dry it to obtain the shell 1 to be treated; S2. Preparation of coloring coating: prepare the corresponding light-curing coloring coating according to [Preparation Example 1]; S3. Coloring treatment: A photocurable coloring coating prepared in [Preparation Example 1] is applied to the surface of the shell 1 to be treated by spraying in a light-proof state, and then, under nitrogen protection, ultraviolet light is uniformly irradiated on the surface of the shell 1 to be treated. The photocurable coloring coating is cured and a coloring coating 12 of about 0.2 mm is formed on the surface of the shell 1, thereby obtaining a corrective insole shell 1 having a coloring coating 12.

[0056] S4, protective layer treatment: a thin layer of UV varnish is sprayed on the surface of the color coating 12, the spraying thickness is 0.1mm, and then, under the protection of nitrogen, it is heated to 50°C and irradiated evenly with ultraviolet light again, the UV varnish is fully cured and a varnish protective layer 13 is formed on the surface of the color coating 12, and the shell 1 of the corrective insole is colored.

[0057] In the step S3 of coloring treatment and the step S4 of protective layer treatment, the wavelength of ultraviolet light is controlled within the range of 365-370 nm, the irradiation distance is maintained at 200 mm, and the irradiation time is 60 s.

[0058] [Example 2] A corrective insole shell, which differs from [Example 1] in that a different shell coloring process is used, specifically, in the shell coloring process, different light-curing coloring paint and ultraviolet light irradiation process are used.

[0059] In this embodiment, a process for coloring the outer shell of a corrective insole to change the mechanics is used, and the photocurable coloring paint is a photocurable coloring paint prepared in [Preparation Example 2]; in step S3 coloring treatment and S4 protective layer treatment, the irradiation wavelength of ultraviolet light is controlled within the range of 365-370nm, the irradiation distance is maintained at 300mm, and the irradiation time is 90s.

[0060] [Example 3] A corrective insole shell, which differs from [Example 1] in that a different shell coloring process is used, specifically, in the shell coloring process, a different light-curing coloring paint is used.

[0061] In this embodiment, a process for coloring the outer shell of a corrective insole to change the mechanics is used, and the photocurable coloring paint is a photocurable coloring paint prepared in [Preparation Example 3].

[0062] [Example 4] A corrective insole shell, which differs from [Example 1] in that a different shell coloring process is used, specifically, in the shell coloring process, a different light-curing coloring paint is used.

[0063] In this embodiment, a process for coloring the outer shell of a corrective insole to change the mechanics is used, and the photocurable coloring paint is a photocurable coloring paint prepared in [Preparation Example 4].

[0064] [Example 5] A corrective insole shell, which differs from [Example 1] in that a different shell coloring process is used, specifically, in the shell coloring process, a different light-curing coloring paint is used.

[0065] In this embodiment, a process for coloring the outer shell of a corrective insole to change the mechanics is used, and the photocurable coloring paint is a photocurable coloring paint prepared in [Preparation Example 5].

[0066] [Example 6] A corrective insole shell, which differs from [Example 1] in that a different shell coloring process is used, specifically, in the shell coloring process, a different light-curing coloring paint is used.

[0067] In this embodiment, a process for coloring the outer shell of a corrective insole to change the mechanics is used, and the photocurable coloring paint is a photocurable coloring paint prepared in [Preparation Example 6].

[0068] Comparative Example [Comparative Example 1] A corrective insole shell, which differs from [Example 1] in that a colored coating 12 is not provided.

[0069] In this comparative example, the housing 1 only includes the shell 11 , and the specific thickness of the shell 11 is 3.1 mm.

[0070] [Comparative Example 2] A corrective insole shell, which differs from [Example 1] in that a colored coating 12 is not provided.

[0071] In this comparative example, the housing 1 only includes the shell 11 , and the specific thickness of the shell 11 is 3.6 mm.

[0072] [Comparative Example 3] A corrective insole shell, which differs from [Example 1] in that a different shell coloring process is used, specifically, in the shell coloring process, a different light-curing coloring paint is used.

[0073] In this embodiment, a process for coloring the outer shell of a corrective insole to change the mechanics is used, and the photocurable coloring paint is a photocurable coloring paint prepared in [Preparation Example 7].

[0074] Performance test data 1. Determination of the compression performance of the shell: The compression performance test was carried out according to "GB / T 1041-2008 Determination of the compression performance of plastics", wherein the test speed was 5 mm / min, and the compression modulus of the corrective insole shell prepared in each embodiment and comparative example was recorded.

[0075] 2. Shell surface hardness test: Test according to GB / T 6739-2006 Determination of paint film hardness by pencil for paint and varnish, and record the pencil hardness of the shell surface of the corrective insole prepared in each embodiment and comparative example. If there is no color coating and varnish protective layer on the surface, no test is performed.

[0076] 3. Color coating adhesion performance test: The shell to be tested is processed according to the shell coloring process, but the S4 protective layer is not treated to obtain the sample to be tested in this test. The sample to be tested in this test is cross-cut according to the "GB / T 9286-2021 Paint and Varnish Cross-cut Test", where the cross-cut spacing is 1mm, and then tested according to the "ASTM D 3359-02 Standard Test Methods for Measuring Adhesion by Tape Test 1", in which 3M tape is fully adhered and quickly torn off at an angle of 60°, and the appearance of the color coating cross-cut is observed. According to Table 1 in the "GB / T 9286-2021 Paint and Varnish Cross-cut Test", the corresponding coating adhesion level is graded and recorded. If there is no color coating on the surface, no test is performed.

[0077] Table 1 Performance test data of corrective insole shell Combining Example 1 with Comparative Examples 1-2 and the data in Table 1, it can be seen that the shell 1 is processed by a shell coloring process of Example 1, specifically spraying a light-curing coloring coating and UV varnish prepared by mixing pigments and light-curing resins on the surface of the shell 11 of the shell 1, wherein the light-curing resin includes epoxy acrylate resin and polyurethane acrylate. After the light-curing coloring coating is irradiated by ultraviolet light and fully cured to form a coloring coating 12, not only can the surface coloring of the corrective insole shell 1 be completed, but the coloring coating 12 can also significantly improve the overall hardness of the shell 1 after the varnish protective layer 13 after the UV varnish is cured. Under the same overall thickness, the shell 1 processed by the shell coloring process has a higher compression modulus, which is conducive to improving the bearing capacity and durability of the shell 1. Similarly, under the same compression modulus and bearing capacity, the corrective insole shell 1 can also be processed by the shell coloring process of Example 1 to become thinner and lighter, which is conducive to reducing the overall weight of the corrective insole and improving the comfort of the corrective insole.

[0078] Combining Example 1 with Example 3-4 and the data in Table 1, it can be seen that when a small amount of epoxidized soybean oil acrylate is added to the photocurable resin, the compression modulus and surface hardness of the shell decrease compared to when not added, but the bonding performance of the colored coating 12 is significantly improved. After cross-cutting and 3M tape adhesion, the cut edge of the colored coating 12 can be completely smooth without shedding in the grid. This may be because epoxidized soybean oil acrylate contains a long-chain fatty acid structure, the molecular chain segment is highly flexible, and lacks a rigid structure similar to multiple benzene rings in bisphenol A epoxy acrylate. Although it can provide better flexibility and adhesion for the colored coating, it is also due to its relatively low cross-linking density and structural rigidity after curing, which directly leads to a decrease in the hardness of the colored coating 12 and reduces the compression modulus and hardness of the overall shell 1.

[0079] As the proportion of epoxidized soybean oil acrylate in the photocurable resin increases, the compression modulus and surface hardness of the shell 1 will further decrease, while the change in the bonding strength of the colored coating 12 is not reflected in this test. Therefore, in the photocurable resin of the photocurable colored coating, when the mixing ratio of bisphenol A epoxy acrylate and epoxidized soybean oil acrylate is 1: (0.15-0.2), the colored coating 12 prepared by the photocurable colored coating after curing can have good hardness and bonding ability, and can form a corrective insole shell 1 with excellent compression modulus in combination with the shell 11 and the varnish protective layer 13.

[0080] Combining Example 3, Comparative Example 3 and Example 5 and the data in Table 1, it can be seen that by adding a certain amount of ultraviolet absorber to the photocurable coloring coating, the overall hardness of the shell 1 will decrease, while the bonding ability of the coloring coating 12 will increase, and the compression modulus of the overall shell 1 will also increase slightly. This may be because both Example 3 and Comparative Example 3 use phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide as a photoinitiator, and phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide has excellent absorption performance, which can fully initiate the curing of the colored photocurable coloring coating after mixing with the pigment filler, but also because it has excellent photosensitivity in the long-wave ultraviolet band, it may be excessively decomposed to produce free radicals under ultraviolet light alone, so that the photocurable coloring coating is quickly and over-cured, and too much heat is generated in a short time, thereby increasing the degree of curing of the coloring coating 12, increasing the hardness, and making the whole brittle, and the higher curing temperature will directly affect the bonding strength between the coloring coating 12 and the shell 11, resulting in a decrease in the bonding performance of the coloring coating 12. Therefore, adding a certain amount of ultraviolet absorber in combination with phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide can absorb ultraviolet light, reduce the absorption of ultraviolet light by phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, and inhibit its photosensitivity, so that the photocurable colored coating can be stably cured under ultraviolet light. At the same time, it can reduce the thermal effect during curing, prevent the colored coating 12 from being affected by overheating and its performance, which is beneficial to improving the comprehensive performance of the colored coating 12.

[0081] Secondly, by further adding a small amount of hindered amine light stabilizer to the light stabilizer and cooperating with the ultraviolet absorber, the overall compression modulus of the shell 1 can be further improved. This may be because the hindered amine light stabilizer can capture the free radicals generated during cross-linking polymerization and properly control the amount of free radicals generated in the system, thereby reducing the explosion of the photocurable resin under ultraviolet light irradiation, so that the color coating 12 can be stably and evenly cured, which is conducive to improving the comprehensive performance of the color coating 12.

[0082] Combining Example 5 and Example 6 and the data in Table 1, it can be seen that by modifying polyvinyl alcohol with ethyl acetoacetate, the surface pencil hardness and the overall compression modulus of the shell 1 can be improved. This may be because after the modification with ethyl acetoacetate, acetoacetyl groups are introduced into the polyvinyl alcohol chain segments, thereby improving the water resistance of polyvinyl alcohol. Since the photocurable resin contains some polyurethane acrylates, polyurethane acrylates have certain hygroscopicity, and the polyvinyl alcohol introduced with acetoacetyl groups can effectively inhibit the hygroscopicity of polyurethane acrylates, thereby helping to reduce the influence of water vapor on the photocurable coloring coating. Secondly, the introduction of acetoacetyl groups can improve the reactivity of polyvinyl alcohol. When the photocurable coloring coating undergoes free radical polymerization and curing, the acetoacetyl groups may undergo cross-linking reactions with the active groups in the system, which is beneficial to improving the cross-linking density of the coloring coating 12 and the bonding performance with the shell 11, as well as the curing degree of the coloring coating 12; at the same time, the acetoacetyl groups can also be further cross-linked with the UV varnish when the UV varnish is cured, thereby improving the bonding performance with the varnish protective layer 13, and improving the curing degree of the varnish protective layer 13, which is beneficial to improving the overall hardness and compression modulus of the shell 1.

[0083] This specific implementation manner is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the specific implementation manner as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A process for coloring the outer shell of an orthotic insole to change the mechanics, characterized in that: The following steps are involved: S1, pretreatment of the shell (11): firstly immerse the shell (11) of the outer shell (1) of the corrective insole in an alkaline detergent, then rinse it with deionized water for multiple times and then dry it to obtain the shell (11) to be treated; S2. Preparation of coloring paint: fully mix the coloring filler with the photocurable resin, the reactive diluent, the photoinitiator and other filler additives, and prepare the photocurable coloring paint; S3, coloring treatment: applying the light-curing coloring coating to the surface of the shell (11) to be treated by spraying in a light-proof state, and then irradiating the surface of the shell (11) to be treated with ultraviolet light evenly under nitrogen protection, so that the light-curing coloring coating is cured and a coloring coating (12) is formed on the surface of the shell (11); S4, protective layer treatment: a thin layer of UV varnish is sprayed on the surface of the coloring coating (12), and then heated and irradiated evenly with ultraviolet light again under the protection of nitrogen, so that the UV varnish is fully cured and a varnish protective layer (13) is formed on the surface of the coloring coating (12), thereby completing the coloring of the outer shell of the corrective insole.

2. The process for coloring the outer shell of an orthotic insole for changing the mechanics of claim 1, characterized in that: The photocurable coloring coating comprises the following raw materials in parts by weight: Light-curing resin: 50-60 parts; Active diluent: 15-22 parts; Photoinitiator: 8-10 parts; Light stabilizer: 0.2-0.4 parts; Hydroxy silicone oil: 4-12 parts; Polyvinyl alcohol: 5-8 parts; Dispersant: 5-7.5 parts; Reinforcing filler: 5-8 parts; Color and filler: 1-1.2 parts; The photocurable resin is a mixture of epoxy acrylate resin and polyurethane acrylate in a weight ratio of 1: (0.5-1).

3. The process for coloring the outer shell of an orthotic insole for changing the mechanics of claim 2, characterized in that: In the photocurable resin, the epoxy acrylate resin used includes bisphenol A epoxy acrylate and epoxidized oil acrylate, and the bisphenol A epoxy acrylate and the epoxidized oil acrylate are mixed and compounded in a weight ratio of 1: (0.1-0.25).

4. The process for coloring the outer shell of an orthotic insole for changing the mechanics of claim 2, characterized in that: The active diluent is a mixture of three materials: ethyl carbamate, 1,6-hexanediol dipropionate and ethoxylated trimethylolpropane triacrylate, and the mixing weight ratio of the ethyl carbamate, the 1,6-hexanediol dipropionate and the ethoxylated trimethylolpropane triacrylate is 1: (0.6-0.75): (0.25-0.6).

5. The process for coloring the outer shell of an orthotic insole for changing the mechanics of claim 2, characterized in that: The photoinitiator is phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, and the light stabilizer is a mixture of ultraviolet absorber UV-P and light stabilizer UV-770 in a weight ratio of 1:(0.15-0.2).

6. The process for coloring the outer shell of an orthotic insole for changing the mechanics of claim 2, characterized in that: The polyvinyl alcohol resin is further modified with ethyl acetoacetate, and the ethyl acetoacetate modification of the polyvinyl alcohol resin comprises the following steps: First, polyvinyl alcohol is added to dimethyl sulfoxide, the temperature is increased to 95-98°C and the stirring is continued to make the polyvinyl alcohol fully dissolved, then an inert gas is continuously introduced into the container and the stirring is continued, ethyl acetoacetate is added, the temperature is increased to 105-115°C, the reaction is continued with stirring and the by-product ethanol is evaporated, after the reaction is completed, the remaining solution is added to methanol for precipitation, filtered and dried to obtain polyvinyl alcohol modified with ethyl acetoacetate.

7. The process for coloring the outer shell of an orthotic insole for changing the mechanics of claim 2, characterized in that: The dispersant is any one of TEGO-610S or TEGO-655, the reinforcing filler is at least one of nano calcium carbonate, talcum powder, mica powder, and barium sulfate; and the color filler is an inorganic pigment.

8. The process for coloring the outer shell of an orthotic insole for changing the mechanics of claim 2, characterized in that: The method for preparing the photocurable colored coating comprises the following steps: A1. Fully mix the photocurable resin, reactive diluent and light stabilizer to obtain masterbatch A; take 10% of the masterbatch A and fully mix it with polyvinyl alcohol, hydroxy silicone oil, dispersant, reinforcing filler and pigment filler, and perform ball milling to obtain masterbatch B; A2. Fully mix the remaining masterbatch A and masterbatch B, heat to 110-135°C and continue stirring for 1-2 hours. After cooling, a light-curing coloring preparatory material is obtained. Then, in a light-proof state, a photoinitiator is added to the light-curing coloring preparatory material, and stirring is maintained at room temperature for 20-30 minutes to obtain a light-curing coloring coating, which needs to be stored in a light-proof state.

9. The process for coloring the outer shell of an orthotic insole for changing the mechanics of claim 8, characterized in that: In the ball milling process, the ball milling speed is set to 1500-2000 r / min, and the ball milling needs to be ground to a fineness of ≤12 μm.

10. The process for coloring the outer shell of a corrective insole for changing the mechanics of claim 2, characterized in that: In the step S3 of coloring treatment and S4 of protective layer treatment, the irradiation wavelength of ultraviolet light is controlled within the range of 365-370 nm, the irradiation distance is maintained at 200-300 mm, and the irradiation time is 60-90 s.

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