A kind of helmet coating and preparation method thereof

Abstract

The present application discloses a helmet coating and a preparation method thereof. A helmet coating is prepared from raw materials of group A, group B and group C; wherein the raw materials of group A are prepared from the following components in mass percentage: wetting agent 0.1% to 0.5%, dispersant 0.1% to 5%, defoamer 0.1% to 0.5%, leveling agent 1% to 5%, trifunctional polyester resin 60% to 80%, polyol 1% to 5%, porous silica 1% to 5%, ultraviolet absorber 1% to 5%, ultraviolet stabilizer 1% to 5%, antioxidant 1% to 5%, and the sum of the mass percentages of each component is 100%; the raw materials of group B are urea-based isocyanate curing agents; the raw materials of group C are polyethylene terephthalate resin fibers and porous silica in a mass ratio of 10 to 15:1, wherein the porous silica contains paraffin. The helmet coating prepared by the present application has the effect of significantly improving the working conditions of workers in high temperature environments and improving their working comfort and safety.

Description

Technical Field

[0001] The present invention relates to the field of safety helmets, and more particularly to a safety helmet coating and a preparation method thereof. Background Art

[0002] Safety helmets are indispensable personal labor safety protection products in industrial production. Their main function is to protect the head from impact, crushing and injuries caused by falling objects and other specific factors. In industrial production environments, injuries to the head are often fatal. Therefore, wearing safety helmets is not only a guarantee for the safety of workers themselves, but also an important measure to ensure the smooth progress of the production process.

[0003] However, in the high temperature conditions of summer, the problem of wearing hard hats often becomes a difficult problem to solve. In summer, the outdoor solar radiation is strong and the temperature is high. Workers are mostly engaged in physical labor, and their heads generate a lot of heat. After wearing a hard hat, a small hot and humid environment will be formed between the head and the hard hat, causing workers to feel uncomfortable. This discomfort is mainly manifested in stuffiness in the head, increased sweating, and may even cause heat stroke. Due to the limited internal space of the hard hat, air circulation is poor, and sweat is difficult to evaporate, further aggravating the accumulation of heat in the head. This discomfort not only affects the physical health of workers, but also has a negative impact on work efficiency and safe production.

[0004] First, a high fever in the head will make it difficult for workers to concentrate, which in turn affects the accuracy, coordination and reaction speed of their movements. The combined effect of these factors greatly increases the probability of accidents when workers operate mechanical equipment or perform other high-risk operations. Secondly, if workers are in a high temperature environment for a long time, their tolerance and physical fitness will decrease, and they will be prone to symptoms such as fatigue and dizziness, which not only affects work efficiency, but also increases safety hazards. Summary of the invention

[0005] In view of the problems existing in the prior art, the present application provides a helmet coating and a preparation method thereof.

[0006] A helmet coating is prepared from raw materials of group A, group B and group C; wherein:

[0007] The raw materials of group A are prepared from the following components in percentage by mass: wetting agent 0.1% to 0.5%, dispersant 0.1% to 5%, defoamer 0.1% to 0.5%, leveling agent 1% to 5%, trifunctional polyester resin 60% to 80%, polyol 1% to 5%, porous silica 1% to 5%, ultraviolet absorber 1% to 5%, ultraviolet stabilizer 1% to 5%, antioxidant 1% to 5%, and the sum of the percentage by mass of each component is 100%;

[0008] The raw material of group B is a urea-based isocyanate curing agent;

[0009] The raw materials of group C are polyethylene terephthalate resin fibers and porous silica in a mass ratio of 10 to 15:1, wherein the porous silica contains paraffin wax;

[0010] The polyethylene terephthalate resin fiber is prepared by a melt-blowing process, and the average fiber diameter of the polyethylene terephthalate resin fiber is 100-200 μm.

[0011] Furthermore, the polyethylene terephthalate resin fiber and porous silica are pretreated together to obtain a preform, and the preparation method of the preform is as follows:

[0012] A1: polyethylene terephthalate resin fibers and porous silica are uniformly mixed in water at a mass ratio of 10 to 15:1 to obtain a mixed slurry;

[0013] A2: Spread the mixed slurry on the mesh plate and perform vacuum suction through the mesh plate on the side away from the mixed slurry;

[0014] A3: Continue vacuum pumping for 5-10 minutes at high temperature, the temperature is set to 230-250℃, the vacuum degree is set to -200--160kPa, and then cool to room temperature;

[0015] A4: Soak the mixture processed in step A3 in molten paraffin for 10 to 30 minutes, then take out the mixture and wait for the paraffin to cool down to obtain a preform.

[0016] Furthermore, the vacuum pumping time in step A2 is 30 to 60 minutes, and the vacuum degree is -150 to -120 kPa.

[0017] Further, half of the polyethylene terephthalate resin fibers and porous silica are pretreated together to obtain a preform, and the other half of the polyethylene terephthalate resin fibers and porous silica are pretreated together to obtain a mixture; the preparation method of the mixture is as follows:

[0018] A1: polyethylene terephthalate resin fibers and porous silica are uniformly mixed in water at a mass ratio of 10 to 15:1 to obtain a mixed slurry;

[0019] A2: Spread the mixed slurry on the screen, and perform vacuum suction on the screen away from the mixed slurry for 30 to 60 minutes; the vacuum degree is -150 to -120 kPa;

[0020] A3: Continue vacuum pumping for 5-10 minutes at high temperature, with the temperature set to 230-250°C and the vacuum degree set to -200-160 kPa, and then cool to room temperature.

[0021] Furthermore, the thickness of the preform and the thickness of the mixture are both controlled to be 5 mm to 15 mm.

[0022] Furthermore, the trifunctional polyester resin is a polymer compound formed by polycondensation of one of diol, dibasic acid and polyol with polyacid.

[0023] Furthermore, the urea-based isocyanate curing agent is a urea-based diisocyanate curing agent, which is prepared from isocyanate, water and HDI.

[0024] Furthermore, the wetting agent is a polyether-modified polydimethylsiloxane solution, the dispersant includes a polyester-modified polydimethylsiloxane solution, the defoaming agent is a polysiloxane solution-type defoaming agent, and the antioxidant is a phosphite antioxidant.

[0025] A method for preparing the above-mentioned helmet coating comprises the following steps:

[0026] S1: mixing trifunctional polyester resin and polyol;

[0027] S2: under rotation and stirring, sequentially adding a wetting agent, a dispersant, a UV absorber, a UV stabilizer, an antioxidant, a leveling agent, and a defoaming agent to the mixed trifunctional polyester resin and polyol, and stirring evenly to obtain a raw material group A;

[0028] S3: preparing a group C of raw materials by mixing ethylene terephthalate resin fiber and porous silica in a certain proportion;

[0029] S4: Mix the raw materials of group A with the raw materials of group B, then immerse the raw materials of group C, and then cover the safety helmet. When the raw materials of group C are completely covered on the safety helmet, apply the mixture of all the raw materials of group A and group B to the safety helmet and solidify it.

[0030] Furthermore, the raw materials in group C also include polyethylene terephthalate resin fibers and porous silica materials that do not contain paraffin, and the two are alternately covered on the safety helmet.

[0031] In summary, the present invention has the following beneficial effects:

[0032] The present invention forms a helmet coating by matching the raw materials of group A, group B and group C, which can effectively improve the heat insulation and heat dissipation effect of the helmet, thereby improving the workers' heads less prone to overheating and causing heat stroke, inattention and other phenomena when wearing helmets in summer environments. The raw materials of group A and group B provide basic adhesion and durability respectively, while the raw materials of group C are the core insulation components. Specifically, polyethylene terephthalate resin fiber has good mechanical strength and heat resistance, while porous silica has excellent thermal insulation performance. By combining these two materials, the raw materials of group C can not only form a solid mesh structure in the coating, but also provide a large number of pores at the microscopic level of the material, which can effectively block heat conduction and further improve the heat insulation performance of the coating. The core of the invention is that the raw materials of group C composed of polyethylene terephthalate resin fiber and porous silica are mixed with the raw materials of group A and group B after forming a preform or a mixture, and then applied to the helmet, so as to form a helmet coating with excellent heat insulation and heat dissipation performance. In this process, the preparation of group C raw materials is particularly critical. The polyethylene terephthalate resin fiber and the porous silica are interlocked, making the porous silica more evenly distributed on the surface of the helmet. Since the mesh structure formed by the polyethylene terephthalate resin fiber can effectively dislocate and isolate the porous silica, the distribution of the porous silica is more reasonable and uniform in three-dimensional angles. This reasonable three-dimensional distribution structure not only improves the thermal insulation effect of the coating, but also enhances the overall stability of the coating.

[0033] The present invention can not only significantly improve the working conditions of workers in high temperature environments, improve their working comfort and safety, but also reduce the accident rate at work by improving workers' attention and reaction speed. When workers wear this improved safety helmet, they will no longer feel uncomfortable due to overheating of the head, so they can work more attentively and improve work efficiency. In addition, this efficient heat-insulating coating also has good environmental adaptability, and can provide workers with reliable head protection whether in hot summer or in other extreme environments. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] The present invention discloses a helmet coating, which is prepared from raw materials of group A, group B and group C; wherein:

[0036] The raw materials of group A are prepared from the following components in percentage by mass: wetting agent 0.1% to 0.5%, dispersant 0.1% to 5%, defoaming agent 0.1% to 0.5%, leveling agent 1% to 5%, trifunctional polyester resin 60% to 80%, polyol 1% to 5%, porous silica 1% to 5%, UV absorber 1% to 5%, UV stabilizer 1% to 5%, antioxidant 1% to 5%, and the sum of the percentage by mass of each component is 100%.

[0037] The trifunctional polyester resin is a polymer compound formed by polycondensation of one of diols, dibasic acids and polyols with polyacids, the wetting agent is a polyether-modified polydimethylsiloxane solution, the dispersant includes a polyester-modified polydimethylsiloxane solution, the defoamer is a polysiloxane solution defoamer, and the ultraviolet absorber is a type of light stabilizer (such as hindered amine light stabilizer), which is an additive for polymer products (such as plastics, rubbers, coatings, synthetic fibers) and can shield or absorb ultraviolet rays. Energy; the UV stabilizer is a Class III light stabilizer that can stabilize the UV absorber (such as propylene glycol); the antioxidant is a phosphite antioxidant (such as antioxidant 168), and the preferred scheme is: the wetting agent is preferably the German BYK chemical polyether modified polydimethylsiloxane BYK-344 wetting and dispersing agent, the dispersant is preferably the German BYK chemical BYK-310 polyester modified polydimethylsiloxane dispersant, and the leveling agent is preferably the German BYK chemical BYK-373 leveling agent.

[0038] The raw material of group B is urea-based isocyanate curing agent, which is a urea-based diisocyanate curing agent prepared from isocyanate, water and HDI (hexamethylene diisocyanate).

[0039] The raw materials of group C are polyethylene terephthalate resin fibers and porous silica in a mass ratio of 10 to 15:1, wherein the porous silica contains paraffin. Among them, the polyethylene terephthalate resin fibers are prepared by a melt-blown process, and the average fiber diameter of the polyethylene terephthalate resin fibers is 100 to 200 μm. Specifically, the polyethylene terephthalate resin fibers in the following embodiments are all melt-blown non-woven fibers of Guangzhou Tairui Nonwoven Co., Ltd. In addition, the polyethylene terephthalate resin fibers and the porous silica are first pretreated together to obtain a preform or a mixture, and the preparation method of the preform is as follows:

[0040] A1: polyethylene terephthalate resin fibers and porous silica are uniformly mixed in water at a mass ratio of 10 to 15:1 to obtain a mixed slurry;

[0041] A2: Spread the mixed slurry on the screen, and perform vacuum suction on the screen away from the mixed slurry for 30 to 60 minutes; the vacuum degree is -150 to -120 kPa;

[0042] A3: Continue vacuum pumping for 5-10 minutes at high temperature, the temperature is set to 230-250℃, the vacuum degree is set to -200--160kPa, and then cool to room temperature;

[0043] A4: Soak the mixture processed in step A3 in molten paraffin for 10 to 30 minutes, then take out the mixture and wait for the paraffin to cool down to obtain a preform.

[0044] The preparation method of the mixture is as follows:

[0045] A1: polyethylene terephthalate resin fibers and porous silica are uniformly mixed in water at a mass ratio of 10 to 15:1 to obtain a mixed slurry;

[0046] A2: Spread the mixed slurry on the screen, and perform vacuum suction on the screen away from the mixed slurry for 30 to 60 minutes; the vacuum degree is -150 to -120 kPa;

[0047] A3: Continue vacuum pumping for 5-10 minutes at high temperature, with the temperature set to 230-250°C and the vacuum degree set to -200-160 kPa, and then cool to room temperature.

[0048] A method for preparing a helmet coating comprises the following steps:

[0049] S1: mixing trifunctional polyester resin and polyol;

[0050] S2: Under rotating stirring, add a wetting agent, a dispersant, a UV absorber, a UV stabilizer, an antioxidant, a leveling agent, and a defoaming agent to the mixed trifunctional polyester resin and polyol in sequence, stir evenly, and obtain a group A raw material; the rotation speed is 400r / min to 600r / min.

[0051] S3: preparing a group C raw material (i.e., a preform and / or a mixture) by proportioning ethylene terephthalate resin fibers and porous silica;

[0052] S4: Mix the raw materials of group A with the raw materials of group B (preferably in a ratio of 1:1), then immerse the raw materials of group C, and then cover the safety helmet. When the raw materials of group C are completely covered on the safety helmet, apply the mixture of all the raw materials of group A and group B to the safety helmet and solidify it.

[0053] The present application is further described in detail below with reference to the embodiments.

[0054] Example 1

[0055] The raw materials of group A are prepared from the following components in mass percentage: wetting agent 0.5%, dispersant 0.5%, defoamer 0.5%, leveling agent 2.5%, trifunctional polyester resin 80%, polyol 4%, UV absorber 5%, UV stabilizer 5%, antioxidant 2%, and the sum of the mass percentages of each component is 100%.

[0056] The raw material of group B is 100% urea-based isocyanate curing agent.

[0057] The raw materials of group C are preforms made of polyethylene terephthalate resin fibers and porous silica in a mass ratio of 10:1. The average fiber diameter of the polyethylene terephthalate resin fibers is 150 μm, and the thickness of the preform is 5 mm. The preparation steps are as follows:

[0058] A1: polyethylene terephthalate resin fibers and porous silica are uniformly mixed in water at a mass ratio of 10:1 to obtain a mixed slurry;

[0059] A2: Spread the mixed slurry on the screen, and perform vacuum suction on the screen away from the mixed slurry for 30 minutes; the vacuum degree is -150kPa;

[0060] A3: Continue vacuum pumping for 5-10 minutes at high temperature, the temperature is set to 230℃, the vacuum degree is set to -200kPa, and then cool to room temperature;

[0061] A4: Soak the mixture processed in step A3 in molten paraffin for 30 minutes, then take out the mixture and wait for the paraffin to cool down to obtain a preform.

[0062] The preparation method of the helmet coating of the present embodiment is as follows:

[0063] S1: mixing trifunctional polyester resin and polyol;

[0064] S2: Under rotating stirring, add a wetting agent, a dispersant, a UV absorber, a UV stabilizer, an antioxidant, a leveling agent, and a defoaming agent to the mixed trifunctional polyester resin and polyol in sequence, stir evenly, and obtain a group A raw material; the rotating speed is 600 r / min.

[0065] S3: preparing a group C raw material (i.e., a preform and / or a mixture) by proportioning ethylene terephthalate resin fibers and porous silica;

[0066] S4: Mix the raw materials of group A with the raw materials of group B (preferably in a ratio of 1:1), then immerse the raw materials of group C (6 preforms), and then cover the safety helmet. When the raw materials of group C (preforms) are all covered on the safety helmet, apply the mixture of all the raw materials of group A and group B to the safety helmet and solidify it.

[0067] Example 2

[0068] The raw materials of group A are prepared from the following components in mass percentage: wetting agent 0.5%, dispersant 0.5%, defoamer 0.5%, leveling agent 2.5%, trifunctional polyester resin 80%, polyol 4%, UV absorber 5%, UV stabilizer 5%, antioxidant 2%, and the sum of the mass percentages of each component is 100%.

[0069] The raw material of group B is 100% urea-based isocyanate curing agent.

[0070] The raw materials of group C are preforms made of polyethylene terephthalate resin fibers and porous silica in a mass ratio of 15:1. The average fiber diameter of the polyethylene terephthalate resin fibers is 200 μm, and the thickness of the preform is 5 mm. The preparation steps are as follows:

[0071] A1: polyethylene terephthalate resin fibers and porous silica are uniformly mixed in water at a mass ratio of 15:1 to obtain a mixed slurry;

[0072] A2: Spread the mixed slurry on the screen, and perform vacuum suction on the screen away from the mixed slurry for 30 minutes; the vacuum degree is -150kPa;

[0073] A3: Continue vacuum pumping for 5-10 minutes at high temperature, the temperature is set to 230℃, the vacuum degree is set to -200kPa, and then cool to room temperature;

[0074] A4: Soak the mixture processed in step A3 in molten paraffin for 30 minutes, then take out the mixture and wait for the paraffin to cool down to obtain a preform.

[0075] The preparation method of the helmet coating of the present embodiment is as follows:

[0076] S1: mixing trifunctional polyester resin and polyol;

[0077] S2: Under rotating stirring, add a wetting agent, a dispersant, a UV absorber, a UV stabilizer, an antioxidant, a leveling agent, and a defoaming agent to the mixed trifunctional polyester resin and polyol in sequence, stir evenly, and obtain a group A raw material; the rotating speed is 600 r / min.

[0078] S3: preparing a group C raw material (i.e., a preform and / or a mixture) by proportioning ethylene terephthalate resin fibers and porous silica;

[0079] S4: Mix the raw materials of group A with the raw materials of group B (preferably in a ratio of 1:1), then immerse the raw materials of group C (6 preforms), and then cover the safety helmet. When the raw materials of group C (preforms) are all covered on the safety helmet, apply the mixture of all the raw materials of group A and group B to the safety helmet and solidify it.

[0080] Example 3

[0081] The raw materials of group A are prepared from the following components in mass percentage: wetting agent 0.5%, dispersant 0.5%, defoamer 0.5%, leveling agent 2.5%, trifunctional polyester resin 80%, polyol 4%, UV absorber 5%, UV stabilizer 5%, antioxidant 2%, and the sum of the mass percentages of each component is 100%.

[0082] The raw material of group B is 100% urea-based isocyanate curing agent.

[0083] The raw materials of group C are preforms made of polyethylene terephthalate resin fibers and porous silica in a mass ratio of 13:1. The average fiber diameter of the polyethylene terephthalate resin fibers is 100 μm, and the thickness of the preform is 5 mm. The preparation steps are as follows:

[0084] A1: polyethylene terephthalate resin fibers and porous silica are uniformly mixed in water at a mass ratio of 13:1 to obtain a mixed slurry;

[0085] A2: Spread the mixed slurry on the screen, and perform vacuum suction on the screen away from the mixed slurry for 30 minutes; the vacuum degree is -150kPa;

[0086] A3: Continue vacuum pumping for 5-10 minutes at high temperature, the temperature is set to 230℃, the vacuum degree is set to -200kPa, and then cool to room temperature;

[0087] A4: Soak the mixture processed in step A3 in molten paraffin for 30 minutes, then take out the mixture and wait for the paraffin to cool down to obtain a preform.

[0088] The preparation method of the helmet coating of the present embodiment is as follows:

[0089] S1: mixing trifunctional polyester resin and polyol;

[0090] S2: Under rotating stirring, add a wetting agent, a dispersant, a UV absorber, a UV stabilizer, an antioxidant, a leveling agent, and a defoaming agent to the mixed trifunctional polyester resin and polyol in sequence, stir evenly, and obtain a group A raw material; the rotating speed is 600 r / min.

[0091] S3: preparing a group C raw material (i.e., a preform and / or a mixture) by proportioning ethylene terephthalate resin fibers and porous silica;

[0092] S4: Mix the raw materials of group A with the raw materials of group B (preferably in a ratio of 1:1), then immerse the raw materials of group C (6 preforms), and then cover the safety helmet. When the raw materials of group C (preforms) are all covered on the safety helmet, apply the mixture of all the raw materials of group A and group B to the safety helmet and solidify it.

[0093] Example 4

[0094] The raw materials of group A are prepared from the following components in mass percentage: wetting agent 0.5%, dispersant 0.5%, defoamer 0.5%, leveling agent 2.5%, trifunctional polyester resin 80%, polyol 4%, UV absorber 5%, UV stabilizer 5%, antioxidant 2%, and the sum of the mass percentages of each component is 100%.

[0095] The raw material of group B is 100% urea-based isocyanate curing agent.

[0096] The raw materials of group C are a preform and a mixture made of polyethylene terephthalate resin fiber and porous silica in a mass ratio of 13:1, and the preform and the mixture each account for half. The average fiber diameter of the polyethylene terephthalate resin fiber is 200 μm, and the thickness of the preform and the mixture is 5 mm. The preparation steps of the preform are as follows:

[0097] A1: polyethylene terephthalate resin fibers and porous silica are uniformly mixed in water at a mass ratio of 13:1 to obtain a mixed slurry;

[0098] A2: Spread the mixed slurry on the screen, and perform vacuum suction on the screen away from the mixed slurry for 30 minutes; the vacuum degree is -150kPa;

[0099] A3: Continue vacuum pumping for 5-10 minutes at high temperature, the temperature is set to 230℃, the vacuum degree is set to -200kPa, and then cool to room temperature;

[0100] A4: Soak the mixture processed in step A3 in molten paraffin for 30 minutes, then take out the mixture and wait for the paraffin to cool down to obtain a preform.

[0101] The preparation method of the mixture is as follows:

[0102] A1: polyethylene terephthalate resin fibers and porous silica are uniformly mixed in water at a mass ratio of 13:1 to obtain a mixed slurry;

[0103] A2: Spread the mixed slurry on the mesh plate, and perform vacuum suction on the mesh plate facing away from the mixed slurry for 60 minutes; the vacuum degree is -120kPa;

[0104] A3: Continue vacuum pumping for 10 min at high temperature, with the temperature set to 230°C and the vacuum degree set to -160 kPa, and then cool to room temperature.

[0105] The preparation method of the helmet coating of the present embodiment is as follows:

[0106] S1: mixing trifunctional polyester resin and polyol;

[0107] S2: Under rotating stirring, add a wetting agent, a dispersant, a UV absorber, a UV stabilizer, an antioxidant, a leveling agent, and a defoaming agent to the mixed trifunctional polyester resin and polyol in sequence, stir evenly, and obtain a group A raw material; the rotating speed is 600 r / min.

[0108] S3: preparing a group C raw material (i.e., a preform and / or a mixture) by proportioning ethylene terephthalate resin fibers and porous silica;

[0109] S4: Mix the raw materials of group A with the raw materials of group B (the ratio is preferably 1:1), then immerse the raw materials of group C (3 preforms and 3 mixtures), and then cover the safety helmet, and the preforms and mixtures are alternately covered on the safety helmet. When all the raw materials of group C are covered on the safety helmet, apply the mixture of all the raw materials of group A and group B to the safety helmet and solidify it.

[0110] The difference between Example 5 and Example 1 is that the polyethylene terephthalate resin fiber and the porous silica are mixed with the raw materials of Group A, and then mixed with the raw materials of Group B and directly coated on the helmet to form a coating, without being made into a preform in advance.

[0111] Comparative Example

[0112] The difference between Comparative Example 1 and Example 1 is that Group C originally only contains polyethylene terephthalate resin fibers.

[0113] Detection Methods

[0114] The safety helmets of the embodiments and comparative examples and ordinary safety helmets were placed in an open place, the bottoms of the safety helmets were sealed with a 30 mm thick foam board to isolate the convection heat transfer between the outside air and the air inside the helmets, and the safety helmets were placed on a table covered with white cloth.

[0115] Temperature measuring point: A temperature recorder is placed inside the helmet, and the measuring point is arranged in the middle of the helmet to test the air temperature in the middle of the helmet.

[0116] A WZY-1 temperature recorder was used to collect the temperature inside the cap. The temperature data collection cycle was 1 minute. The average temperature from 12 o'clock to 14 o'clock was recorded and tested for three days.

[0117]

[0118] From the data in the above table, it can be seen that the helmet coatings of various embodiments of the present invention have a great effect on improving the comfort of the helmet, and from the comparison between Examples 1-3 and Example 4, it can be seen that when the preform and the mixture are staggered and stacked on the helmet, the heat insulation and heat dissipation effect of the helmet is better. From the comparison with Example 5, it can be seen that the polyethylene terephthalate resin fiber and porous silica have a greatly improved heat insulation effect on the helmet after being prepared into a preform or a mixture.

[0119] This specific embodiment 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 modifications to the present embodiment without any creative contribution 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 helmet coating, characterized in that: It is prepared from raw materials of group A, group B and group C; wherein, The raw materials of group A are prepared from the following components in percentage by mass: 0.5% wetting agent, 0.5% dispersant, 0.5% defoamer, 2.5% leveling agent, 80% trifunctional polyester resin, 4% polyol, 5% ultraviolet absorber, 5% ultraviolet stabilizer, and 2% antioxidant, and the sum of the percentage by mass of each component is 100; The raw material of group B is a urea-based isocyanate curing agent; The raw materials of group C are polyethylene terephthalate resin fibers and porous silica in a mass ratio of 10 to 15:1, wherein the porous silica contains paraffin wax; the polyethylene terephthalate resin fibers and porous silica are pretreated together to obtain a preform; or half of the polyethylene terephthalate resin fibers and porous silica are pretreated together to obtain a preform, and the other half of the polyethylene terephthalate resin fibers and porous silica are pretreated together to obtain a mixture; The preparation steps of the preform are as follows: A1: polyethylene terephthalate resin fibers and porous silica are uniformly mixed in water at a mass ratio of 10 to 15:1 to obtain a mixed slurry; A2: Spread the mixed slurry on the mesh plate and perform vacuum suction through the mesh plate on the side away from the mixed slurry; A3: Continue vacuum pumping for 5-10 minutes at high temperature, the temperature is set to 230-250℃, the vacuum degree is set to -200--160kPa, and then cool to room temperature; A4: Soak the mixture processed in step A3 in molten paraffin for 10 to 30 minutes, then take out the mixture and wait for the paraffin to cool to obtain a preform; The preparation steps of the mixture are as follows: A1: polyethylene terephthalate resin fibers and porous silica are uniformly mixed in water at a mass ratio of 10 to 15:1 to obtain a mixed slurry; A2: Spread the mixed slurry on the screen, and perform vacuum suction on the screen away from the mixed slurry for 30 to 60 minutes; the vacuum degree is -150 to -120 kPa; A3: Continue vacuum pumping for 5-10 minutes at high temperature, the temperature is set to 230-250℃, the vacuum degree is set to -200--160kPa, and then cool to room temperature; The polyethylene terephthalate resin fiber is prepared by a melt-blowing process, and the average fiber diameter of the polyethylene terephthalate resin fiber is 100-200 μm.

2. The helmet coating according to claim 1, characterized in that: The vacuum pumping time in the step A2 of preparing the preform is 30 to 60 minutes, and the vacuum degree is -150 to -120 kPa.

3. The helmet coating according to claim 1, characterized in that: The thickness of the preform and the thickness of the mixed body are both controlled to be 5 mm to 15 mm.

4. The helmet coating according to claim 1, characterized in that: The urea-based isocyanate curing agent is a urea-based diisocyanate curing agent, which is prepared from isocyanate, water and HDI.

5. The helmet coating according to claim 1, characterized in that: The wetting agent is a polyether-modified polydimethylsiloxane solution, the dispersant includes a polyester-modified polydimethylsiloxane solution, the defoaming agent is a polysiloxane solution-type defoaming agent, and the antioxidant is a phosphite antioxidant.

6. A method for preparing a helmet coating according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: mixing trifunctional polyester resin and polyol; S2: under rotation and stirring, sequentially adding a wetting agent, a dispersant, a UV absorber, a UV stabilizer, an antioxidant, a leveling agent, and a defoaming agent to the mixed trifunctional polyester resin and polyol, and stirring evenly to obtain a raw material group A; S3: preparing a group C of raw materials by mixing ethylene terephthalate resin fiber and porous silica in a certain proportion; S4: Mix the raw materials of group A with the raw materials of group B, then immerse the raw materials of group C, and then cover the safety helmet. When the raw materials of group C are completely covered on the safety helmet, apply the mixture of all the raw materials of group A and group B to the safety helmet and solidify it.

7. The method for preparing the helmet coating according to claim 6, characterized in that: The raw materials in group C also include polyethylene terephthalate resin fibers and porous silica materials that do not contain paraffin, and the two materials are alternately covered on the safety helmet.

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