A non-porous substrate surface maintenance cloth and a production device thereof

Abstract

The present application relates to the field of article surface maintenance material, and discloses a non-porous substrate surface maintenance cloth and a production device thereof.The maintenance cloth comprises at least one maintenance agent storage layer and at least one liquid guide layer; the liquid guide layer is fixed on the maintenance agent storage layer; the maintenance agent storage layer comprises a fiber web and a maintenance agent attached to the fiber web, and the maintenance agent comprises water-repellent substances; a plurality of liquid guide holes penetrating through the liquid guide layer are arranged in the liquid guide layer.The maintenance cloth of the present application can form a hydrophobic maintenance film on the surface of the non-porous substrate rapidly while being wiped, is convenient to use, and is convenient to carry and store in addition; furthermore, the loss of the maintenance agent during storage is less, and the content of the maintenance agent in the maintenance cloth can be better ensured.

Description

Technical Field

[0001] This invention relates to the field of surface maintenance materials for articles, and more particularly to a non-porous substrate surface maintenance cloth and its production apparatus. Background Technology

[0002] With the development of my country's automobile industry and the continuous improvement of people's living standards, cars have become commonplace in households. However, while the widespread use of cars brings convenience, it also brings many impacts to our lives, especially the issue of safe driving. For drivers, the transparency and smoothness of the car's windshield directly affect driving safety and comfort.

[0003] As we all know, the biggest impact of rain on drivers is the obstruction of their vision, especially in heavy rain when windshield wipers are significantly less effective, posing a major safety hazard. Therefore, to reduce rainwater adhesion to the windshield and minimize its impact on the driver's vision, water-repellent agents (coating agents) are typically applied to the windshield to form a hydrophobic film, thus preventing rainwater adhesion. However, most existing water-repellent agent (coating agent) products have the following problems:

[0004] 1. Most existing traditional water repellents (coating agents) are liquids that are sprayed directly onto the car windshield. After these car water repellents (coating agents) are sprayed onto the car windshield, a certain amount of time needs to be waited for them to form a hydrophobic film on the windshield to achieve a better water repellency effect.

[0005] 2. Most existing water-repellent agents (coating agents) are bottled sprays, which are inconvenient to carry and store, and the shelf life will be affected after opening.

[0006] 3. Existing water repellent agents (coating agents) are generally used with a wiping cloth or sponge. After spraying the water repellent agent (coating agent) onto the car glass, the wiping cloth or sponge is used to wipe it so that it can form a film evenly and quickly. However, this method is time-consuming, laborious, inconvenient to use, and cannot solve the problem of water repellent agents (coating agents) being inconvenient to carry and store.

[0007] 4. If the existing water-repellent agent (coating agent) is pre-applied to ordinary non-woven materials and then wiped directly with the non-woven materials during use, the water-repellent agent (coating agent) will have poor durability and will not remain on the non-woven materials for a long time during storage. Summary of the Invention

[0008] To address the aforementioned technical problems, this invention provides a surface curing cloth for non-porous substrates and its production apparatus. This curing cloth can simultaneously and rapidly form a hydrophobic curing film on the surface of a non-porous substrate while wiping. It is convenient to use, easy to carry and store. Furthermore, it exhibits minimal loss of curing agent during storage, effectively ensuring the curing agent content within the cloth.

[0009] The specific technical solution of this invention is as follows:

[0010] In a first aspect, the present invention provides a non-porous substrate surface curing cloth, comprising at least one curing agent storage layer and at least one liquid guiding layer; the liquid guiding layer is stacked and fixed on the curing agent storage layer; the curing agent storage layer comprises a fiber web and a curing agent attached to the fiber web, the curing agent comprising a water-repellent substance; the liquid guiding layer is provided with a plurality of liquid guiding pores penetrating the liquid guiding layer.

[0011] This invention attaches a protective agent to fibers within a protective agent storage layer. During use, the protective cloth is first moistened with water. The protective agent attached to the fibers disperses into the water, changing from a dry to a wet state. The protective cloth is then wiped onto a non-porous substrate surface, such as a car windshield. The wet protective agent is transferred to the non-porous substrate, forming a protective film on the substrate surface. The water-repellent substances in the protective agent impart good hydrophobicity to this film, thus preventing rainwater from adhering to the non-porous substrate surface. Through this method, a hydrophobic protective film is formed simultaneously on the non-porous substrate surface during wiping, solving the problems of complex application, long film-forming time, inconvenient carrying and storage, and short shelf life associated with traditional water-repellent agents (coating agents).

[0012] Furthermore, the present invention employs a composite structure of a curing agent storage layer and a liquid guiding layer, which has the following effects: During the storage of the curing cloth, the cooperation of the curing agent storage layer and the liquid guiding layer can prevent the curing agent in the curing agent storage layer from transferring outward, thereby ensuring the content of curing agent in the curing cloth and better exerting its function; When in use, after the curing cloth is wetted, the liquid guiding pores in the liquid guiding layer can guide the curing agent, which has been transformed into a wet state, to the outer surface of the liquid guiding layer. Then, during wiping, the wet curing agent on the outer surface of the liquid guiding layer is transferred to the surface of the non-porous substrate to form a hydrophobic curing film.

[0013] Preferably, the maintenance agent comprises an aqueous polymer film attached to the fiber web and a water-repellent substance dispersed in the aqueous polymer film; the mass ratio between the aqueous polymer film and the water-repellent substance is 1:0.5 to 0.8.

[0014] Aqueous polymers exhibit good water solubility. When the mass ratio of the aqueous polymer film to the water-repellent substance is controlled at 1:0.5–0.8, after the curing cloth is wetted, the aqueous polymer can effectively disperse the water-repellent substance into the water to form an emulsion, which is then transferred to the surface of the curing cloth. When the wet curing agent is transferred to the surface of the non-porous substrate, the film-forming properties of the aqueous polymer facilitate the formation of a curing film on the non-porous substrate surface. Simultaneously, the water-repellent substance is dispersed within the curing film, imparting hydrophobicity to the film. This film-forming method using aqueous polymers does not leave oil stains on the surface of the non-porous substrate. Therefore, when used on automotive windshields, it ensures the windshield's transparency and smoothness, improving driving safety. Furthermore, the curing agent also includes a surfactant dispersed within the aqueous polymer film; the mass ratio of the aqueous polymer film to the surfactant is 1:0.01–0.06.

[0015] Surfactants can be used to accelerate the emulsification and dispersion of the curing agent when the curing cloth is wetted, and can also improve the water absorption of the fiber web in the curing agent storage layer, thereby accelerating the formation of a hydrophobic film on the surface of the non-porous substrate. At the same time, they can also help to accelerate the removal of some stains on the surface of the non-porous substrate, making the surface of non-porous substrates such as glass bright and improving its light transmittance.

[0016] Preferably, the aqueous polymer membrane is a polyvinyl alcohol membrane; and the water-repellent substance is dimethyl polysiloxane.

[0017] Polyvinyl alcohol is easy to form emulsions, has good fiber drawing properties, and can be repeatedly cured on fibers. After the hydrophobic protective film is formed on the non-porous substrate, it can achieve advantages such as wear resistance, sun resistance, and corrosion resistance.

[0018] Silicone oil possesses properties such as heat resistance, electrical insulation, weather resistance, hydrophobicity, physiological inertness, and low surface tension. Furthermore, it exhibits a low viscosity-temperature coefficient, high compressibility, and radiation resistance. This invention utilizes dimethyl polysiloxane, which enables the film formed by the curing agent on a non-porous substrate surface to possess excellent water repellency and weather resistance, thus better achieving the technical effects of this invention.

[0019] Preferably, the fiber web in the maintenance agent storage layer is a hydrophilic fiber web; the liquid guiding layer includes a hydrophobic fiber web.

[0020] The hydrophilicity of the fiber web in the curing agent storage layer helps to store the aqueous polymers in the curing agent, preventing their loss. Simultaneously, the aqueous polymers adhering to the fiber web can fix the water-repellent substances within, thus preventing their loss as well. The hydrophobicity of the fiber web in the liquid-wicking layer prevents the absorption of wet curing agents (emulsions formed by dispersing curing agents in water) during the use of the curing fabric, and also prevents the aqueous polymers from carrying water-repellent substances to adhere to the fibers of the liquid-wicking layer. Furthermore, the fiber web in the liquid-wicking layer can utilize the gaps between the fibers to form liquid-wicking pores, providing transfer channels for the release of the curing agent.

[0021] Preferably, a liquid-conducting layer is stacked and fixed on both sides of each of the maintenance agent storage layers.

[0022] This invention combines the upper and lower surfaces of the curing agent storage layer with the liquid guiding layer for better prevention of curing agent loss and further increases the curing agent content in the curing fabric.

[0023] Preferably, the fiber packing density in the curing agent storage layer is greater than that in the liquid guiding layer; and the fiber length and / or fineness in the liquid guiding layer is greater than that in the curing agent storage layer.

[0024] In this invention, the fiber packing density of the liquid-guiding layer is lower than that of the fiber packing density in the curing agent storage layer, that is, the porosity of the liquid-guiding layer is higher than that of the curing agent storage layer. When the curing cloth is used, it is beneficial for the wet curing agent to enter the high-porosity liquid-guiding layer from the low-porosity curing agent storage layer and be transferred to the surface of the object being cured as soon as possible, thereby achieving the purpose of this invention.

[0025] In contrast, when fibers are fine and long, the material has low density and high porosity; conversely, when fibers are thin and short, the material has high density and low porosity. Therefore, the differentiated design of specific fiber lengths and fineness in the curing agent storage layer and the liquid guiding layer facilitates the transfer of the curing agent to the surface of the curing cloth during use. Simultaneously, short and fine fibers are prone to shedding; layering a liquid guiding layer with long and coarse fibers onto the curing agent storage layer prevents shedding of the curing agent storage layer.

[0026] Furthermore, the fiber lengths in the maintenance agent storage layer and the liquid guiding layer are 1-15 mm and 20-65 mm, respectively, and the fiber fineness is 0.5-2.3 dtex and 1.5-10 dtex, respectively.

[0027] Preferably, the hydrophilic fiber web is a fiber assembly formed by the intertwining of hydrophilic fibers and core-sheath composite fibers; the hydrophobic fiber web is a fiber web composed of hydrophobic fibers and core-sheath composite fibers; in the core-sheath composite fibers, the melting point of the sheath component is lower than that of the core component.

[0028] By adding core-sheath composite fibers with a lower melting point in the sheath layer than in the core layer to the liquid-guiding layer and the curing agent storage layer, thermal processing can be used to connect and fix the sheath layers between the fibers, resulting in a full and thick feel and strengthening the connection between the liquid-guiding layer and the curing agent storage layer. Simultaneously, it can form interconnected pores in the liquid-guiding layer, which is beneficial for the release of the curing agent during use. Furthermore, while conventional nonwoven fabric reinforcement methods (such as hydroentangling and needle punching) can also achieve fiber entanglement and strengthen the connection between the liquid-guiding layer and the curing agent storage layer, the pores in the curing fabric are prone to significant deformation under external force during wiping, causing uneven distribution of the curing agent transferred to the non-porous substrate surface. However, this invention, by introducing core-sheath composite fibers and using their sheath-fusion bonding to form connections between the fibers, prevents the pores in the curing fabric from deforming significantly during wiping, thus making the distribution of the curing agent transferred to the non-porous substrate surface more uniform, resulting in a curing film with better water-repellent effect on the non-porous substrate surface.

[0029] Furthermore, the hydrophilic fiber is a cellulose fiber.

[0030] Cellulose fibers are derived from plants. Their macromolecules contain extremely strong hydrophilic groups (hydroxyl groups), which give them excellent hydrophilicity and biodegradability. This allows them to well meet the liquid absorption needs of the maintenance agent storage layer.

[0031] Furthermore, the hydrophobic fiber is a synthetic fiber.

[0032] Synthetic fibers are fibers produced by solution or solution spinning of polymers obtained from the homopolymerization or copolymerization of low-molecular-weight organic monomers, or by blending or compounding of polymers. Synthetic fibers have a high degree of polymerization and poor hygroscopicity, which imparts good hydrophobicity to the liquid-conducting layer.

[0033] Furthermore, the synthetic fiber is a polyester fiber, a polyolefin fiber, or a polyamide fiber.

[0034] Polyester, polyolefin, and polyamide fibers lack hydrophilic groups, resulting in extremely poor moisture absorption. Polypropylene fibers, in particular, are virtually non-hygroscopic and highly hydrophobic, making them ideal fibers for the liquid-conducting layer of this invention.

[0035] Furthermore, in the core-sheath composite fiber, the melting point of the sheath component is 110–135°C.

[0036] Preferably, the average fiber packing density of the non-porous substrate surface curing cloth is 0.08–0.2 g / cm³. 3 The mass per unit area is 60–160 g / m² 2 The ratio of longitudinal to transverse fracture strength in the dry state is 0.7 to 1.4:1.

[0037] Fiber packing density, the ratio of weight to apparent volume, directly affects the permeability and mechanical properties of a material. The curing cloth of this invention is used in wiping applications, and its average fiber packing density is controlled at 0.08–0.2 g / cm³. 3 It can make the material soft, comfortable, and have a full and thick feel, and make the curing agent in the curing agent storage layer easily released to the surface of the curing agent after the curing cloth is wetted.

[0038] Non-porous substrates are mostly characterized by their hardness and smooth surface. When wiping the surface of non-porous substrates, the wiping cloth needs to have a certain thickness. Cloths with too low a basis weight will have low friction and poor cleaning effect, and the wiping cloth with too low a basis weight will also have poor effect on forming a protective film and weak capacity to carry the protective agent. A basis weight (mass per unit area) of 60-160 g / m² is recommended. 2 The material can achieve both wiping and film-forming effects very well.

[0039] If the difference between the longitudinal and transverse strengths of the curing cloth is too large, the curing cloth is prone to stretching and deformation during use, resulting in uneven distribution of the curing agent transferred to the non-porous substrate surface, which affects the water-repellent effect of the formed curing film. Therefore, the team of this invention has determined the optimal range of the above-mentioned dry longitudinal and transverse strength ratio through experimental research.

[0040] Preferably, the mass of the curing agent accounts for 1.5 to 20% of the total mass of the curing cloth on the surface of the non-porous substrate.

[0041] When the content of the curing agent in the curing cloth is too high, it will cause the curing cloth to have poor water absorption and be difficult to wet with water, thus causing the curing agent to transfer to the surface of the curing cloth.

[0042] Secondly, the present invention provides a production apparatus for the surface curing cloth of the non-porous substrate, which, in the material travel direction, sequentially includes a curing agent application unit and a laminating unit; the curing agent application unit includes an impregnation tank and an impregnation roller disposed in the impregnation tank; the laminating unit, in the material travel direction, sequentially includes a set of upper and lower opposing composite rollers, a drying device and at least a set of upper and lower opposing cooling rollers.

[0043] The working process of preparing the protective fabric of the present invention using the above-mentioned production device is as follows: In the protective agent application unit, the protective agent storage layer without protective agent is put into the impregnation tank, and the protective agent impregnation liquid is applied to the protective agent storage layer; then in the lamination unit, the composite roller lamination layer is laminated onto the protective agent storage layer, and the drying device dries the protective agent impregnation liquid in the protective agent storage layer to make it dry. At the same time, when the liquid-guiding layer and the protective agent storage layer contain core-sheath composite fibers, the drying device can also melt the sheath layer to strengthen the connection between fibers in each layer and the connection between the liquid-guiding layer and the protective agent storage layer. After that, the laminated material is cooled by the cooling roller, and the thickness of the protective fabric can be controlled.

[0044] Preferably, the drying device is a hot air penetration oven.

[0045] By using a hot air penetration drying oven, the curing cloth can achieve a soft and full hand feel, better realize the purpose of the present invention, and obtain beneficial technical effects.

[0046] Preferably, a rolling unit is provided downstream of the laminating unit according to the material travel direction.

[0047] Furthermore, the rolling unit includes a rolling machine.

[0048] Compared with the prior art, the present invention has the following advantages:

[0049] (1) In the curing cloth of the present invention, the curing agent is attached to the fiber. When using it, the curing cloth is moistened and then the curing agent can be applied to the surface of the non-porous substrate by wiping and a film can be formed quickly. This can solve the problems of existing water repellents (coating agents) having complicated application operations, long film forming time, inconvenience in carrying, and short shelf life.

[0050] (2) The curing cloth of the present invention adopts a composite structure of a curing agent storage layer and a liquid guiding layer with a specific structure, which can reduce the loss of curing agent during storage, ensure the content of curing agent in the curing cloth, and quickly release the curing agent that has been wetted and turned into a wet state when used.

[0051] (3) The protective cloth of the present invention adopts a specific protective agent design, which is conducive to its centralized storage in the hydrophilic protective agent storage layer. When in use, the water-repellent substance is easily dispersed into the water and then transferred to the surface of the protective cloth. At the same time, it can also avoid the formation of oil stains on the surface of the non-porous substrate by the protective agent, and can solve the problems of poor durability, easy reduction of water repellency effect and poor high temperature resistance of existing water repellent agents (coating agents).

[0052] (4) In the curing cloth of the present invention, by 1○ using hydrophilic and hydrophobic fiber webs in the curing agent storage layer and the liquid guiding layer respectively, +2○ adopting specific differentiated design for fiber length, fineness and packing density in the curing agent storage layer and the liquid guiding layer, +3○ introducing core-sheath composite fibers with a sheath melting point lower than that of the core layer, +4○ controlling the average fiber packing density, unit area mass, dry longitudinal and transverse breaking strength ratio and curing agent content of the curing cloth within a specific range, it is beneficial to improve the performance of the curing cloth and further improve the water repellency effect of the curing film formed on the surface of the non-porous substrate;

[0053] (5) The curing cloth production device of the present invention can realize the preparation of a composite curing cloth with a curing agent storage layer and a liquid guiding layer having a specific structure. The device is reasonably designed and easy to operate, and is a better way to prepare the product of the present invention. Attached Figure Description

[0054] Figure 1 This is a schematic diagram of the structure of the surface curing cloth for the non-porous substrate in Example 1;

[0055] Figure 2 This is a cross-sectional schematic diagram of the surface curing cloth for the non-porous substrate in Examples 2 and 3;

[0056] Figure 3 This is a schematic diagram of the production apparatus for the non-porous substrate surface curing cloth in Example 1.

[0057] Figure 4 This is a schematic diagram of the production apparatus for the non-porous substrate surface curing cloth in Examples 2 and 3.

[0058] The attached figures are labeled as follows: 1. Curing agent storage layer; 2. Liquid guiding layer; 201. Liquid guiding pores; 301. Impregnation tank; 302. Impregnation roller; 303. First guide roller; 304. Second guide roller; 401. Composite roller; 402. Drying device; 403. Cooling roller; 501. Winding machine; 502. Third guide roller; 6. Hydrophilic fiber web; 7. Hydrophobic fiber web; 8. Composite fiber web. Detailed Implementation

[0059] The present invention will be further described below with reference to embodiments. Unless otherwise specified, the apparatuses, connection structures, and methods involved in this invention are all well-known in the art.

[0060] General Implementation Examples

[0061] A non-porous substrate surface curing cloth, such as Figures 1-2As shown, it includes at least one curing agent storage layer 1 and at least one liquid guiding layer 2; the liquid guiding layer 2 is stacked and fixed on the curing agent storage layer 1; the curing agent storage layer 1 includes a fiber web and a curing agent attached to the fiber web, the curing agent including a water-repellent substance; the liquid guiding layer 2 is provided with a plurality of liquid guiding pores 201 penetrating the liquid guiding layer 2.

[0062] In one specific embodiment, the curing agent comprises an aqueous polymer membrane attached to the fiber web, and a water-repellent substance and a surfactant dispersed within the aqueous polymer membrane; the mass ratio of the aqueous polymer membrane, the water-repellent substance, and the surfactant is 1:0.5–0.8:0.01–0.06. Optionally, the aqueous polymer membrane is a polyvinyl alcohol membrane, and the water-repellent substance is dimethyl polysiloxane.

[0063] In one specific embodiment, the fiber web in the maintenance agent storage layer 1 is a hydrophilic fiber web; the liquid guiding layer 2 includes a hydrophobic fiber web.

[0064] In one specific implementation, a liquid-conducting layer 2 is stacked and fixed on both sides of each of the maintenance agent storage layers 1.

[0065] In one specific embodiment, the fiber packing density in the curing agent storage layer 1 is greater than that in the liquid guiding layer 2; the fiber length and / or fineness in the liquid guiding layer 2 is greater than that in the curing agent storage layer 1. Optionally, the fiber lengths in the curing agent storage layer 1 and the liquid guiding layer 2 are 1–15 mm and 20–65 mm, respectively, and the fiber finenesses are 0.5–2 dtex and 1.5–10 dtex, respectively.

[0066] In one specific embodiment, the hydrophilic fiber web is a fiber assembly composed of hydrophilic fibers and core-sheath composite fibers intertwined; the hydrophobic fiber web is a fiber web composed of hydrophobic fibers and core-sheath composite fibers; in the core-sheath composite fibers, the melting point of the sheath component is lower than that of the core component. Optionally, the hydrophilic fiber is cellulose fiber, and the synthetic fiber is polyester fiber, polyolefin fiber, or polyamide fiber; in the core-sheath composite fibers, the melting point of the sheath component is 110–135°C.

[0067] In one specific embodiment, the average fiber packing density of the non-porous substrate surface curing cloth is 0.08–0.2 g / cm³. 3 The mass per unit area is 60–160 g / m² 2 The ratio of longitudinal to transverse tensile strength in the dry state is 0.7 to 1.4:1; the mass of the curing agent accounts for 1.5 to 20% of the total mass of the curing cloth on the surface of the non-porous substrate.

[0068] An apparatus for producing the above-mentioned non-porous substrate surface curing cloth, such as Figures 3-4 As shown, in the material travel direction, the assembly includes a curing agent application unit and a lamination unit in sequence; the curing agent application unit includes an impregnation tank 301 and an impregnation roller 302 disposed in the impregnation tank 301; the lamination unit, in the material travel direction, includes a set of upper and lower opposing composite rollers 401, a drying device 402 and at least a set of upper and lower opposing cooling rollers 403 in sequence.

[0069] In one specific embodiment, the drying device 402 is a hot air penetration type oven.

[0070] In one specific implementation, a winding unit is provided downstream of the laminating unit according to the material travel direction; the winding unit includes a winding machine 501.

[0071] Example 1

[0072] A non-porous substrate surface curing cloth, such as Figure 1 As shown, it has a double-layer structure, consisting of a curing agent storage layer 1 and a liquid guiding layer 2 stacked and fixed on top of each other. Wherein:

[0073] The curing agent storage layer 1 consists of a hydrophilic fiber web and a curing agent attached to the hydrophilic fiber web. The hydrophilic fiber web is composed of 95% viscose short fibers (1.33 dtex * 10 mm) and 5% core-sheath type ES composite fibers (2.22 dtex * 10 mm, the sheath is polyethylene with a melting point of 110℃, lower than the melting point of the core layer) intertwined. The curing agent consists of a polyvinyl alcohol film attached to the hydrophilic fiber web (accounting for 8.9% of the total mass of the curing cloth on the entire non-porous substrate surface), and dimethyl polysiloxane (accounting for 7% of the total mass of the curing cloth on the entire non-porous substrate surface) and sodium dodecylbenzene sulfonate (accounting for 0.1% of the total mass of the curing cloth on the entire non-porous substrate surface) dispersed in the polyvinyl alcohol film. The liquid-conducting layer 2 is a hydrophobic fiber web composed of 90% polyester fibers (1.56 dtex * 38 mm) and 10% core-sheath type ES composite fibers (2.22 dtex * 38 mm, the sheath is polyethylene with a melting point of 110℃, lower than the melting point of the core layer). The gaps between the fibers form liquid-conducting pores 201 that penetrate the liquid-conducting layer 2. The fiber packing density in the curing agent storage layer 1 is greater than that in the liquid-conducting layer 2.

[0074] The unit area mass of the non-porous substrate surface curing cloth is 160 g / m². 2 The average fiber packing density is 0.12 g / cm³. 3 The ratio of longitudinal to transverse tensile strength in the dry state is 0.7:1, and the mass of the curing agent accounts for 16% of the total mass of the curing cloth on the surface of the non-porous substrate.

[0075] When using the non-porous substrate surface curing cloth of the present invention, it is first moistened with water. At this time, the curing agent attached in the curing agent storage layer 1 is dispersed into the water, changing from a dry state to a wet state. Then, the curing cloth is wiped on the surface of a non-porous substrate such as a car windshield. The wet curing agent is transferred to the non-porous substrate, and a hydrophobic curing film is formed on the surface of the substrate.

[0076] A production apparatus for preparing the non-porous substrate surface curing cloth of this embodiment, such as Figure 3 As shown, in the direction of material travel, it consists of a curing agent application unit, a lamination unit, and a winding unit, in sequence. Among them:

[0077] The curing agent application unit consists of an impregnation tank 301, an impregnation roller 302 disposed within the impregnation tank 301, a first guide roller 303 disposed upstream of the impregnation tank 301, and a second guide roller 304 disposed between the impregnation tank 301 and the laminating unit. The laminating unit, in the material travel direction, consists of a set of upper and lower opposing composite rollers 401, a drying device 402, and a set of upper and lower opposing cooling rollers 403. The drying device 402 is a hot air penetrating oven. The winding unit consists of a winding machine 501 and a third guide roller 502 disposed between the cooling rollers 403 and the winding machine 501.

[0078] The working process of the production device in this embodiment is as follows: Figure 3 As shown, the details are as follows:

[0079] (1) The hydrophilic fiber web 6 (fiber packing density is 0.13 g / cm³) 3 The material is introduced into the impregnation tank 301 containing the curing agent impregnation liquid through the first guide roller 303, and is impregnated in the curing agent impregnation liquid by the impregnation roller 302.

[0080] (2) After the hydrophilic fiber web with the curing agent impregnation liquid is drawn out from the impregnation tank 301 by the second guide roller 304, the hydrophobic fiber web 7 (fiber packing density of 0.10 g / cm³) is then guided by the composite roller 401. 3 The double-layer composite fiber web 8 is then fed into a drying device 402, where the curing agent impregnation liquid inside the hydrophilic fiber web is dried, and the curing agent is transformed into a dry state. At the same time, the sheath of the core-sheath type ES composite fiber melts, strengthening the connection between the fibers in each layer and fixing the double-layer material into one piece. The dried composite fiber web passes through the middle of the cooling rollers 403 arranged opposite to each other, which cools the material and controls the material thickness.

[0081] (3) The cooled composite fiber web is fed into the roll forming machine 501 through the third guide roller 502 to obtain a non-porous substrate surface curing cloth.

[0082] Example 2

[0083] A non-porous substrate surface curing cloth, such as Figure 2 As shown, it has a three-layer structure, consisting of a curing agent storage layer 1 and two liquid guiding layers 2. The two liquid guiding layers 2 are respectively stacked and fixed on the upper and lower surfaces of the curing agent storage layer 1. Wherein:

[0084] The curing agent storage layer 1 consists of a hydrophilic fiber web and a curing agent attached to the hydrophilic fiber web. The hydrophilic fiber web is composed of 95% softwood pulp fiber (approximately 2-4 mm) and 5% core-sheath type ES composite short fiber (2.22 dtex * 10 mm, the sheath is polyethylene with a melting point of 125°C, lower than the melting point of the core layer) intertwined. The curing agent consists of a polyvinyl alcohol film attached to the hydrophilic fiber web (accounting for 8.3% of the total mass of the curing cloth on the entire non-porous substrate surface), and dimethyl polysiloxane (accounting for 6.6% of the total mass of the curing cloth on the entire non-porous substrate surface) and sodium dodecylbenzene sulfonate (accounting for 0.1% of the total mass of the curing cloth on the entire non-porous substrate surface) dispersed in the polyvinyl alcohol film. The liquid-conducting layer 2 is a hydrophobic fiber web composed of 90% polyester fibers (1.56 dtex * 38 mm) and 10% core-sheath type ES composite fibers (2.22 dtex * 38 mm, the sheath is polyethylene with a melting point of 125℃, lower than the melting point of the core layer). The fiber packing density in the curing agent storage layer 1 is greater than that in the liquid-conducting layer 2.

[0085] The unit area mass of the non-porous substrate surface curing cloth is 80 g / m². 2 The average fiber packing density is 0.11 g / cm³. 3 The ratio of longitudinal to transverse tensile strength in the dry state is 1.3:1, and the mass of the curing agent accounts for 15% of the total mass of the curing cloth on the surface of the non-porous substrate.

[0086] When using the non-porous substrate surface curing cloth of the present invention, it is first moistened with water. At this time, the curing agent attached in the curing agent storage layer 1 is dispersed into the water, changing from a dry state to a wet state. Then, the curing cloth is wiped on the surface of a non-porous substrate such as a car windshield. The wet curing agent is transferred to the non-porous substrate, and a hydrophobic curing film is formed on the surface of the substrate.

[0087] The production apparatus used to prepare the non-porous substrate surface curing cloth in this embodiment has the same structure as in Embodiment 1.

[0088] The working process of the production device in this embodiment is as follows: Figure 4 As shown, the details are as follows:

[0089] (1) The hydrophilic fiber web 6 (fiber packing density is 0.12 g / cm³) 3 The material is introduced into the impregnation tank 301 containing the curing agent impregnation liquid through the first guide roller 303, and is impregnated in the curing agent impregnation liquid by the impregnation roller 302.

[0090] (2) After the hydrophilic fiber web with the curing agent impregnation liquid is drawn out from the impregnation tank 301 by the second guide roller 304, the two layers of hydrophobic fiber web 7 (fiber packing density of 0.10 g / cm³) are then passed through the composite roller 401. 3 The three layers of fiber web are then stacked onto the upper and lower surfaces of the hydrophilic fiber web. The three-layer composite fiber web 8 is then fed into the drying device 402, where the curing agent impregnation liquid inside the hydrophilic fiber web is dried, and the curing agent is transformed into a dry state. At the same time, the sheath of the core-sheath type ES composite fiber melts, strengthening the connection between the fibers in each layer and fixing the three layers of material into one. The dried composite fiber web passes through the middle of the cooling rollers 403 arranged opposite to each other, which cools the material and controls the material thickness.

[0091] (3) The cooled composite fiber web is fed into the roll forming machine 501 through the third guide roller 502 to obtain a non-porous substrate surface curing cloth.

[0092] Example 3

[0093] A non-porous substrate surface curing cloth, such as Figure 2 As shown, it has a three-layer structure, consisting of a curing agent storage layer 1 and two liquid guiding layers 2. The two liquid guiding layers 2 are respectively stacked and fixed on the upper and lower surfaces of the curing agent storage layer 1. Wherein:

[0094] The curing agent storage layer 1 consists of a hydrophilic fiber web and a curing agent attached to the hydrophilic fiber web. The hydrophilic fiber web is composed of 95% viscose short fibers (1.33 dtex * 10 mm) and 5% core-sheath type ES composite short fibers (2.22 dtex * 10 mm, the sheath is polyethylene with a melting point of 125℃, lower than the melting point of the core layer) intertwined. The curing agent consists of a polyvinyl alcohol film attached to the hydrophilic fiber web (accounting for 11.7% of the total mass of the curing cloth on the entire non-porous substrate surface), and dimethyl polysiloxane (accounting for 8.2% of the total mass of the curing cloth on the entire non-porous substrate surface) and sodium dodecylbenzene sulfonate (accounting for 0.1% of the total mass of the curing cloth on the entire non-porous substrate surface) dispersed in the polyvinyl alcohol film. The liquid-conducting layer 2 is a hydrophobic fiber web composed of 90% polyester fibers (1.56 dtex * 38 mm) and 10% core-sheath type ES composite fibers (2.22 dtex * 38 mm, the sheath is polyethylene with a melting point of 125℃, lower than the melting point of the core layer). The fiber packing density in the curing agent storage layer 1 is greater than that in the liquid-conducting layer 2.

[0095] The unit area mass of the non-porous substrate surface curing cloth is 80 g / m². 2 The average fiber packing density is 0.2 g / cm³. 3The ratio of longitudinal to transverse tensile strength in the dry state is 1:1, and the mass of the curing agent accounts for 20% of the total mass of the curing cloth on the surface of the non-porous substrate.

[0096] When using the non-porous substrate surface curing cloth of the present invention, it is first moistened with water. At this time, the curing agent attached in the curing agent storage layer 1 is dispersed into the water, changing from a dry state to a wet state. Then, the curing cloth is wiped on the surface of a non-porous substrate such as a car windshield. The wet curing agent is transferred to the non-porous substrate, and a hydrophobic curing film is formed on the surface of the substrate.

[0097] The production apparatus used to prepare the non-porous substrate surface curing cloth in this embodiment has the same structure as in Embodiment 1.

[0098] The working process of the production device in this embodiment is as follows: Figure 4 As shown, the details are as follows:

[0099] (1) The hydrophilic fiber web 6 (fiber packing density is 0.22 g / cm³) 3 The material is introduced into the impregnation tank 301 containing the curing agent impregnation liquid through the first guide roller 303, and is impregnated in the curing agent impregnation liquid by the impregnation roller 302.

[0100] (2) After the hydrophilic fiber web with the curing agent impregnation liquid is drawn out from the impregnation tank 301 by the second guide roller 304, the two layers of hydrophobic fiber web 7 (fiber packing density of 0.19 g / cm³) are then passed through the composite roller 401. 3 The three layers of fiber web are then stacked onto the upper and lower surfaces of the hydrophilic fiber web. The three-layer composite fiber web 8 is then fed into the drying device 402, where the curing agent impregnation liquid inside the hydrophilic fiber web is dried, and the curing agent is transformed into a dry state. At the same time, the sheath of the core-sheath type ES composite fiber melts, strengthening the connection between the fibers in each layer and fixing the three layers of material into one. The dried composite fiber web passes through the middle of the cooling rollers 403 arranged opposite to each other, which cools the material and controls the material thickness.

[0101] (3) The cooled composite fiber web is fed into the roll forming machine 501 through the third guide roller 502 to obtain a non-porous substrate surface curing cloth.

[0102] Comparative Example 1

[0103] The only difference between the non-porous substrate surface curing cloth in this comparative example and Example 2 is that, in the curing agent storage layer 1, the mass percentages of polyvinyl alcohol film and dimethyl polysiloxane in the entire non-porous substrate surface curing cloth are 6.9% and 8%, respectively. All other aspects are the same as in Example 2.

[0104] The production apparatus and operating process used to prepare the non-porous substrate surface curing cloth of this comparative example are the same as those in Example 2.

[0105] Comparative Example 2

[0106] The only difference between the non-porous substrate surface curing cloth in this comparative example and Example 3 is that the polyester fibers (1.56 dtex * 38 mm) in the liquid-guiding layer 2 are replaced with an equal mass of viscose fibers (1.6 dtex * 38 mm), meaning that the liquid-guiding layer 2 in this comparative example is a hydrophilic fiber web. Everything else is the same as in Example 3.

[0107] The production apparatus and operating process used to prepare the non-porous substrate surface curing cloth of this comparative example are the same as those in Example 3.

[0108] Comparative Example 3

[0109] The only difference between the non-porous substrate surface curing cloth in this comparative example and Example 3 is that, in the curing agent storage layer 1, the viscose short fibers (1.33 dtex * 10 mm) are replaced with an equal mass of viscose fibers (1.6 dtex * 38 mm), and the core-sheath type ES composite short fibers (2.22 dtex * 10 mm) are replaced with an equal mass of core-sheath type ES composite fibers (2.22 dtex * 38 mm); the fiber packing density in the curing agent storage layer 1 and the liquid guiding layer 2 is the same, and the average fiber packing density of the non-porous substrate surface curing cloth is 0.18 g / cm³. 3 Everything else is the same as in Example 3.

[0110] The production apparatus used to prepare the non-porous substrate surface curing cloth of this comparative example is the same as that in Example 3. The only difference between the production apparatus of this comparative example and that of Example 3 is that the fiber packing density of both the hydrophilic fiber web 6 and the hydrophobic fiber web 7 (before lamination) is 0.14 g / cm³. 3 .

[0111] Comparative Example 4

[0112] The only difference between the non-porous substrate surface curing cloth in this comparative example and Example 2 is that the average fiber packing density of the non-porous substrate surface curing cloth is 0.3 g / cm³. 3 Everything else is the same as in Example 2.

[0113] The production apparatus used to prepare the non-porous substrate surface curing cloth of this comparative example is the same as that in Example 2. The only difference between the production apparatus of this comparative example and that of Example 2 is that the fiber packing density of the hydrophilic fiber web 6 and the hydrophobic fiber web 7 (before lamination) used is 0.26 g / cm³. 3 and 0.23g / cm 3 .

[0114] Comparative Example 5

[0115] The only difference between the non-porous substrate surface curing cloth in this comparative example and Example 2 is that the ratio of the dry longitudinal to transverse tensile strength of the non-porous substrate surface curing cloth is 1.9:1. All other aspects are the same as in Example 2.

[0116] The production apparatus and operating process used to prepare the non-porous substrate surface curing cloth of this comparative example are the same as those in Example 2.

[0117] Comparative Example 6

[0118] The only difference between the non-porous substrate surface curing cloth in this comparative example and Example 3 is that the unit area mass of the non-porous substrate surface curing cloth is 85 g / m². 2 The curing agent accounts for 25% of the total mass of the non-porous substrate surface curing cloth. Among them, the mass percentages of polyvinyl alcohol film, dimethyl polysiloxane, and sodium dodecylbenzene sulfonate in the entire non-porous substrate surface curing cloth are 14.6%, 10.3%, and 0.1%, respectively. The rest are the same as in Example 3.

[0119] The production apparatus and operating process used to prepare the non-porous substrate surface curing cloth of this comparative example are the same as those in Example 3.

[0120] Performance testing and evaluation: The purpose of the test is to evaluate the water repellency and water absorption properties of the non-porous substrate surface curing cloths in each embodiment and comparative example.

[0121] Test items and methods:

[0122] 1. Water repellency of materials:

[0123] After wiping the surface of the non-porous substrate with a maintenance material, the time it takes for a water droplet to slide off the surface of the non-porous substrate is tested.

[0124] Test method:

[0125] (1) Prepare a clean glass plate (size 25cm*37cm), and wipe the entire surface of the glass plate evenly once with surface protection material;

[0126] (2) Place the glass plate at an angle below the funnel outlet of the water-repellency tester, with the angle between the glass plate and the operating platform surface being 30 degrees.

[0127] (3) Use a dropper to drop a drop of water (0.12g) from the top of the funnel and record the time it takes for the water drop to fall from the glass plate to the bottom of the glass plate; test each sample five times and take the average of the water drop's sliding time as the evaluation data;

[0128] (4) The time (in seconds) for a water droplet to slide off the glass plate is used as the evaluation standard. If the sliding time is ≤2 seconds, the standard requirement is met; if the sliding time is >2 seconds, it is deemed unqualified.

[0129] 2. Durable water repellency:

[0130] After wiping the non-porous substrate with a curing material, the retention of water repellency under wet conditions was tested.

[0131] Test method:

[0132] (1) Test the water droplet sliding time (seconds) of the sample according to the material water repellency test method, record it and use it as the initial data;

[0133] (2) Place the glass plate that has undergone the initial test horizontally in the container, and add water to the container so that the glass plate is completely submerged in the water;

[0134] (3) Place the container containing the glass plate into a water-jacketed constant temperature incubator, set the incubator to a constant temperature of 30 degrees Celsius, and remove the glass plate after 96 hours.

[0135] (4) Test the average water droplet sliding time of the glass plate again according to the material water repellency test method, record it and use it as actual data;

[0136] (5) Use the percentage of the initial data and the actual data of the water droplet sliding time as a durability indicator to evaluate the durability of the material's water-repellent performance.

[0137] 3. Material water absorption:

[0138] A "liquid absorption" test is performed on surface maintenance materials to evaluate their water absorption properties.

[0139] Test method: Performed in accordance with GB / T 24218.6.

[0140] The performance test results are shown in Table 1.

[0141] Table 1 Performance Test Results

[0142]

[0143]

[0144] Test Result Analysis:

[0145] (1) As can be seen from Table 1, compared with Comparative Example 1, Example 2 has significantly smaller initial and decay values ​​of water droplet sliding time and significantly higher liquid absorption.

[0146] The reason for this phenomenon is that in Comparative Example 1, the ratio between the water-based polymer and the water-repellent substance in the curing agent is too large (i.e., too much water-repellent substance and too little water-based polymer), which will cause the curing fabric to lose its water absorption capacity, and the water-repellent substance will not be easily dispersed into the water after wetting. However, in Example 2, by controlling the ratio of the two at an appropriate level, the curing fabric can be easily wetted, and the water-based polymer can better disperse the water-repellent substance into the water to form an emulsion, which is then transferred to the surface of the curing fabric.

[0147] (2) As can be seen from Table 1, compared with Comparative Example 2, Example 3 has significantly smaller initial and attenuation values ​​of water droplet sliding time, and significantly better water repellency.

[0148] The reason for this phenomenon is that the liquid-conducting layer of Comparative Example 2 uses a hydrophilic fiber web. When the curing cloth is used, the wet curing agent is easily absorbed by the liquid-conducting layer during the transfer process to the surface of the curing cloth. In addition, the water-based polymer easily carries the water-repellent substances in it to adhere to the hydrophilic fibers in the liquid-conducting layer, resulting in less curing agent being applied to the surface of the substrate being cured. In contrast, the liquid-conducting layer of Example 3 uses a hydrophobic fiber web, which can reduce the loss of curing agent in the liquid-conducting layer.

[0149] (3) As can be seen from Table 1, compared with Comparative Example 3, Example 3 has significantly smaller initial and attenuation values ​​of water droplet sliding time, and significantly better water repellency.

[0150] The reason for this phenomenon is that in Example 3, the fiber length and fineness in the liquid guiding layer are greater than those in the curing agent storage layer, and the fiber packing density is less than that in the curing agent storage layer. This design allows the curing cloth to facilitate the transfer of wet curing agent from the low-porosity curing agent storage layer to the high-porosity liquid guiding layer during use, and to quickly transfer it to the surface of the substrate to form a curing film. In contrast, in Comparative Example 3, the fiber length, fineness, and fiber packing density in the liquid guiding layer are similar to those in the curing agent storage layer, which cannot accelerate the transfer of wet curing agent.

[0151] (4) As can be seen from Table 1, compared with Comparative Example 4, Example 2 has significantly smaller initial and decay values ​​of water droplet sliding time, significantly better water repellency, and significantly higher liquid absorption.

[0152] The reason for this phenomenon is that the average fiber packing density of the curing cloth in Comparative Example 4 is too high, which makes it difficult for the curing agent in the curing agent storage layer to be released and transferred to the surface of the curing cloth. This affects the water-repellent effect and water-repellent durability of the curing film formed on the surface of the curing substrate. At the same time, it also makes it difficult for water to enter the interior of the curing cloth, and the curing cloth is not easy to be wetted, which will further aggravate the deterioration of the water-repellent performance of the curing film.

[0153] (5) As can be seen from Table 1, compared with Comparative Example 5, Example 2 has significantly smaller initial and attenuation values ​​of water droplet sliding time, and significantly better water repellency.

[0154] The reason for this phenomenon is that in Comparative Example 5, the difference in the longitudinal and transverse tensile strength of the curing cloth in the dry state is too large, and it is easy to deform during the wiping process, resulting in uneven distribution of the curing agent transferred to the surface of the substrate being cured, thus the water repellency performance of the curing film formed is poor.

[0155] (6) As can be seen from Table 1, compared with Comparative Example 6, Example 3 has significantly smaller initial and decay values ​​of water droplet sliding time, and significantly higher liquid absorption.

[0156] The reason for this phenomenon is that in Comparative Example 6, the content of the curing agent in the curing cloth was too high, resulting in poor water absorption of the curing cloth. It was not easy to be wetted by water during use, which caused the curing agent to transfer to the surface of the curing cloth.

[0157] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural transformations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A non-porous substrate surface curing cloth, characterized in that, It includes at least one curing agent storage layer and at least one liquid-conducting layer; the liquid-conducting layer is stacked and fixed on the curing agent storage layer; the curing agent storage layer includes a hydrophilic fiber web and a dry curing agent attached to the hydrophilic fiber web; the curing agent includes an aqueous polymer film attached to the hydrophilic fiber web, and also includes a water-repellent substance and a surfactant dispersed in the aqueous polymer film; the liquid-conducting layer has a plurality of liquid-conducting pores penetrating the liquid-conducting layer; the liquid-conducting layer includes a hydrophobic fiber web; the fiber packing density in the curing agent storage layer is greater than that in the liquid-conducting layer; the average fiber packing density of the curing cloth on the non-porous substrate surface is 0.08~0.2 g / cm³. 3 Non-porous substrate surface curing cloth is used to form a hydrophobic curing film on the surface of non-porous substrates.

2. The non-porous substrate surface curing cloth as described in claim 1, characterized in that, The mass ratio between the aqueous polymer membrane and the water-repellent substance is 1:0.5~0.

8.

3. The non-porous substrate surface curing cloth as described in claim 1 or 2, characterized in that, The mass ratio of the aqueous polymer film to the surfactant is 1:0.01~0.

06.

4. The non-porous substrate surface curing cloth as described in claim 1, characterized in that, Each of the maintenance agent storage layers has a liquid-conducting layer superimposed and fixed on both sides of its surface.

5. The non-porous substrate surface curing cloth as described in claim 1, characterized in that, The fiber length and / or fineness in the liquid guiding layer are greater than those in the maintenance agent storage layer.

6. The non-porous substrate surface curing cloth as described in claim 1, characterized in that, The hydrophilic fiber web is a fiber assembly composed of hydrophilic fibers and core-sheath composite fibers intertwined with each other; the hydrophobic fiber web is a fiber web composed of hydrophobic fibers and core-sheath composite fibers; in the core-sheath composite fibers, the melting point of the sheath component is lower than that of the core component.

7. The non-porous substrate surface curing cloth as described in claim 1, characterized in that, The unit area mass of the non-porous substrate surface curing cloth is 60~160g / m². 2 .

8. The non-porous substrate surface curing cloth as described in claim 1, characterized in that, The dry longitudinal and transverse tensile strength ratio of the surface curing cloth of the non-porous substrate is 0.7~1.4:

1.

9. The non-porous substrate surface curing cloth as described in claim 1, characterized in that, The mass of the curing agent accounts for 1.5 to 20% of the total mass of the curing cloth on the surface of the non-porous substrate.

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