A sand drop resistant, crack resistant and weather resistant coating suitable for high polymer base material and its construction method

Abstract

This invention relates to the field of polymer material protective coating technology, specifically to a weather-resistant, anti-sanding, crack-resistant coating suitable for polymer substrates and its application method. The coating comprises a polymer substrate and a weather-resistant and wear-resistant functional layer directly adhered to the substrate surface. The functional layer utilizes an aliphatic polyurea / aspartic polyurea resin system, internally containing solidified hard, wear-resistant inorganic aggregates. It can be directly adhered to various polymer substrates without a primer and supports single-layer or multi-layer composite molding. This invention optimizes the coating formulation ratio, achieving UV resistance and weather resistance through a fully aliphatic system, and preventing sand shedding and particle loss through a resin-encapsulated aggregate structure. This effectively solves the problems of easy delamination, sanding, powdering, cracking, and poor weather resistance in existing polymer substrate coatings. Simultaneously, it simplifies the construction process; the substrate can be directly coated after cleaning. It has wide applicability and a long service life, and can be widely applied to various indoor and outdoor polymer substrate protection scenarios such as campuses, parks, and outdoor sports fields, possessing extremely high promotional and application value.

Description

Technical Field

[0001] This invention relates to the field of protective coating technology for polymer materials, specifically to a sand-resistant, crack-resistant, and weather-resistant coating suitable for polymer substrates and its construction method. Background Technology

[0002] PVC sports materials and PVC and polymer substrates are widely used in schools, parks, and sports fields. PVC substrates themselves contain a large amount of plasticizers. Prolonged exposure to outdoor sunlight, temperature fluctuations, and rainwater immersion can easily cause plasticizer migration and precipitation, resulting in oiling of the substrate. Conventional coating systems have the following fatal flaws: 1. PVC and polymer substrates have low surface energy and are inert; ordinary coatings only form a pseudo-physical adhesion, easily leading to delamination and blistering after aging; 2. Continuous exudation of plasticizers from PVC and polymer substrates isolates the coating-substrate interface, causing the entire coating to peel off; 3. Most coatings on the market use aromatic polyurethane or aromatic polyurea systems, which have poor UV resistance, showing signs of loss of gloss, cracking, and chalking after 3-6 months outdoors; 4. The coefficient of thermal expansion of PVC and polymer substrates is much greater than that of conventional coating materials; alternating hot and cold deformation and stretching easily cause the coating to become brittle and tear; 5. Ordinary coatings have poor aggregate cohesion, easily resulting in sand shedding, exposure of the substrate, and sandblasting after being stepped on and rubbed, leading to a very short service life. Currently, conventional protective coatings for PVC and polymer substrates in the industry mostly rely on primer matching and multi-layer composite structures. They generally suffer from poor aggregate consolidation, weak weather resistance, and inability to adapt to the deformation characteristics of PVC substrates. They cannot simultaneously solve the industry pain points of PVC substrate coatings such as sand shedding, powdering, cracking, and easy peeling, and there is a significant technological gap.

[0003] Therefore, it is necessary to develop a sand-resistant, crack-resistant, and weather-resistant coating suitable for polymer substrates and its construction method to solve the above-mentioned problems existing in the current technology. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the above-mentioned technologies and provide a sand-resistant, crack-resistant, and weather-resistant coating suitable for polymer substrates and its construction method. It does not require a primer and is directly compatible with PVC and polymer substrates. It effectively solves the problems of coating delamination, sanding, cracking, and powdering failure from the material and structural levels, and greatly improves the service life outdoors.

[0005] To achieve the above objectives, this invention provides a weather-resistant coating for polymer substrates that prevents sand shedding and cracking, and its construction method, comprising: a polymer substrate and a weather-resistant and wear-resistant functional layer; the weather-resistant and wear-resistant functional layer is compositely disposed on the surface of the polymer substrate, and is a single-layer structure or a multi-layer composite structure; the weather-resistant and wear-resistant functional layer contains solidified hard wear-resistant inorganic aggregates, which are polyurea and / or aspartic polyurea polymer systems cured with aliphatic isocyanates; the weather-resistant and wear-resistant functional layer does not require a base coating and is directly adhered to the surface of the polymer substrate; the weather-resistant and wear-resistant functional layer as a whole possesses flexible deformation buffering, aggregate consolidation to prevent sand shedding, UV resistance to prevent powdering, waterproofing and crack resistance, and high wear resistance.

[0006] Furthermore, the polymer substrate is a polymer elastic and rigid substrate used in sports venues, including one or more of PVC substrate, rubber substrate, EPDM elastic substrate, and plastic composite substrate, covering rigid, semi-rigid, and soft substrates with arbitrary deformation characteristics, without being limited by the elasticity, hardness, or density of the substrate.

[0007] Furthermore, the weather-resistant and wear-resistant functional layer comprises, by weight: 20-60 parts of aliphatic polyurea resin component A, 20-60 parts of aliphatic isocyanate curing agent component B, 10-50 parts of wear-resistant aggregate, and 1-5 parts of additives; the coating has an elongation at break of ≥100% and an adhesion to the polymer substrate of ≥2MPa.

[0008] Furthermore, the hard wear-resistant inorganic aggregate within the weather-resistant and wear-resistant functional layer is completely encapsulated and solidified by aliphatic polyurea resin.

[0009] Furthermore, the process includes the following steps: S1. Substrate pretreatment: The surface of the polymer substrate is cleaned, dried, and degreased to ensure a clean surface; S2. Functional layer construction: An aliphatic polyurea / aspartic polyurea functional layer doped with hard wear-resistant inorganic aggregate is directly coated onto the clean polymer substrate surface. It can be molded as a single layer or as multiple layers separately, and cured at room temperature or under conventional curing conditions.

[0010] Furthermore, the coating method described in step S2 includes one or more of blade coating, roller coating, or spray coating.

[0011] Compared with the prior art, the present invention has the following beneficial effects: No primer required, efficient and stable construction: The coating of this invention can be directly bonded to the polymer substrate for molding without the need for a primer, which greatly simplifies the construction process, reduces construction costs, and completely avoids the problems of delamination, hollowing, and whole-piece peeling caused by the failure of the primer in traditional coatings, thus greatly improving the service stability of the coating.

[0012] Superior weather resistance and long-lasting anti-aging: Utilizing a full aliphatic resin system with no benzene rings that are prone to aging, it possesses excellent resistance to UV rays, water, damp heat, and high and low temperature alternation. It will not yellow, chalk, lose its gloss, or crack during long-term outdoor use, completely solving the pain points of short-term aging and failure of traditional coatings and significantly extending the service life of the site.

[0013] Fully encapsulated aggregate, completely preventing sand shedding and granulation: The hard and wear-resistant aggregate is completely encapsulated and consolidated by high-toughness aliphatic polyurea resin, with no exposed or loose aggregate. It can resist trampling friction, vehicle rolling and rain erosion and wear for a long time, completely eliminating failure problems such as sand shedding, granulation, sanding and exposing the base of the site. The flatness and wear resistance of the site are stable and long-lasting.

[0014] Highly flexible to adapt to substrate deformation, with excellent crack resistance: The coating has an elongation at break of ≥100%, which has excellent deformation following ability and can perfectly match the thermal expansion and contraction deformation characteristics of polymer substrates such as PVC. It does not crack, tear, or delaminate under high and low temperature thermal cycling conditions, and is suitable for complex outdoor temperature difference environments.

[0015] Wide adaptability and high barriers to entry: No layered structure restrictions, single-layer and multi-layer molding is possible, adaptable to various rigid, semi-rigid and flexible polymer substrates, covering all indoor and outdoor venues such as campuses, parks and sports fields, with dual innovation in structure and formula, and high barriers to technology protection. Attached Figure Description

[0016] Figure 1 This is a three-dimensional exploded view of the weather-resistant coating structure of the present invention, which is applicable to polymer substrates and has anti-sand shedding, crack-resistant and weather-resistant coating and its construction method.

[0017] Figure 2 This is a framework diagram of the construction steps for an anti-sand-cracking, anti-weather-resistant coating for polymer substrates and its construction method, according to the present invention.

[0018] The diagram is labeled as follows: 1. Weather-resistant and wear-resistant functional layer; 2. Polymer substrate. Detailed Implementation

[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In the description of the embodiments of the present invention, if a feature is referred to as "setting", "fixing", "connecting", or "installing" on another feature, it can be set, fixed, or connected directly to the other feature, or it can be set, fixed, connected, or installed indirectly on the other feature.

[0022] In the description of the embodiments of the present invention, the term "several" means one or more, and the term "multiple" means two or more. The terms "greater than," "less than," and "exceeding" should be understood as excluding the stated number, while the terms "above," "below," and "within" should be understood as including the stated number. The terms "first" and "second" should be understood as distinguishing technical features and not as indicating or implying relative importance, the number of indicated technical features, or the order of the indicated technical features.

[0023] The present invention will be further described in detail below with reference to specific embodiments. Example

[0024] A sand-repellent, crack-resistant, and weather-resistant coating suitable for polymer substrates and its construction method are provided. By weight, it comprises: 50 parts of aliphatic polyurea resin component A (aspartic resin), 30 parts of aliphatic isocyanate curing agent component B, 20 parts of wear-resistant aggregate (quartz sand with a particle size of 0.5-1mm), and 3 parts of additives.

[0025] Construction method: After cleaning and drying the PVC sports field substrate surface by removing dust and oil, directly apply the above-mentioned aliphatic polyurea coating and cure at room temperature for 24 hours. The coating thickness is 2mm.

[0026] Performance tests showed that the coating had an elongation at break of 120%, an adhesion of 2.5 MPa to the PVC substrate, and showed no yellowing, powdering, or cracking after 12 months of outdoor exposure. Abrasion tests also showed no sand shedding. Example

[0027] A sand-repellent, crack-resistant, and weather-resistant coating suitable for polymer substrates and its construction method are provided. By weight, it comprises: 40 parts of aliphatic polyurea resin component A (aspartic resin), 40 parts of aliphatic isocyanate curing agent component B, 20 parts of wear-resistant aggregate (brown corundum with a particle size of 1-2 mm), and 2 parts of additives.

[0028] Application method: After cleaning the surface of the EPDM substrate, apply the above coating directly by spraying and cure at room temperature for 12 hours to achieve a coating thickness of 1.5 mm.

[0029] Performance tests showed that the coating had an elongation at break of 150%, an adhesion of 2.2 MPa to the EPDM substrate, and showed no cracking, peeling, or sand shedding after 8 months of outdoor use. Example

[0030] A weather-resistant coating for preventing sand shedding and cracking, suitable for polymer substrates, and its construction method are provided. By weight, it comprises: 60 parts of aliphatic polyurea resin component A (aspartic resin), 20 parts of aliphatic isocyanate curing agent component B, 15 parts of wear-resistant aggregate (carborundum with a particle size of 0.1-0.5mm), and 5 parts of additives.

[0031] Construction method: After cleaning and drying the surface of the rubber substrate, apply the functional layer in two layers. The first layer is 1mm thick and the second layer is 1.5mm thick. After curing at room temperature, the total thickness is 2.5mm.

[0032] Performance tests showed that the coating had an elongation at break of 110%, an adhesion of 2.1 MPa to the rubber substrate, and showed no powdering, cracking, or sand shedding after 10 months of outdoor use.

[0033] Comparative example (traditional aromatic polyurea coating) A conventional aromatic polyurea coating, along with a dedicated primer, is applied to the same PVC substrate surface and cured using standard procedures. After 3 months of outdoor exposure, slight loss of gloss occurs; after 5 months, localized chalking and minor cracking appear; after prolonged foot traffic, significant sand shedding and aggregate loss occur; and after high and low temperature cycling, localized delamination and blistering of the coating occur.

[0034] As can be seen from the comparison of the embodiments and comparative examples, the aliphatic polyurea resin system of the present invention, combined with internally consolidated wear-resistant hard aggregate, can be directly bonded to PVC and polymer substrates without the need for a primer. The high-toughness resin completely encapsulates the aggregate, achieving long-lasting protection against sand shedding; the all-aliphatic system provides UV resistance, waterproofing, and aging resistance; and the highly flexible formula matches the deformation of PVC and polymer substrates, preventing cracking. Simultaneously, a simplified construction process is provided, allowing direct coating and molding on clean PVC and polymer substrate surfaces, making it suitable for various indoor and outdoor PVC and polymer substrate sports field scenarios.

[0035] Specifically, this invention provides a weather-resistant, anti-sanding, crack-resistant coating suitable for polymer substrates and its application method. The coating structure comprises a polymer substrate and a weather-resistant and wear-resistant functional layer attached thereon. The functional layer uses an aliphatic polyurea resin system with internally consolidated wear-resistant hard aggregates. No primer layer is required between the functional layer and the polymer substrate. The material formulation, by weight, includes: 20-60 parts of aliphatic polyurea resin component A (aspartic resin), 20-60 parts of aliphatic isocyanate curing agent component B, 10-50 parts of wear-resistant aggregates, and 1-5 parts of additives. The coating has an elongation at break ≥100% and adhesion to PVC substrates ≥2 MPa. The application method involves cleaning the surface of the polymer substrate, directly applying the aliphatic polyurea coating, and allowing it to cure naturally or by heat, applying one or more layers to the designed thickness. This invention effectively solves the problems of sand shedding, powdering, cracking, and peeling of coatings on PVC and polymer substrates from both material and structural perspectives, significantly improving outdoor service life.

[0036] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A sand-resistant, crack-resistant, and weather-resistant coating suitable for polymer substrates and its application method, characterized in that, include: Weather-resistant and wear-resistant functional layer (1) and polymer substrate (2); the weather-resistant and wear-resistant functional layer (1) is compositely disposed on the surface of the polymer substrate (2), and is a single-layer structure or a multi-layer composite structure; the weather-resistant and wear-resistant functional layer (1) is internally solidified with hard wear-resistant inorganic aggregate, and adopts a polyurea and / or aspartic polyurea polymer system cured by aliphatic isocyanate; the weather-resistant and wear-resistant functional layer (1) does not need to be set with a base coating between it and the polymer substrate (2), and is directly attached to the surface of the polymer substrate (2); the weather-resistant and wear-resistant functional layer (1) as a whole has flexible deformation buffer, aggregate solidification to prevent sand shedding, UV resistance to prevent powdering, waterproof and crack resistance and high wear resistance.

2. The anti-sand-cracking, weather-resistant coating suitable for polymer substrates and its construction method according to claim 1, characterized in that: The polymer substrate (2) is a polymer elastic and rigid substrate used in sports fields, including one or more of PVC substrate, rubber substrate, EPDM elastic substrate, and plastic composite substrate, covering rigid, semi-rigid, and soft substrates with arbitrary deformation characteristics, without being limited by the elastic strength, hardness, or material density of the substrate.

3. The anti-sand-crack-resistant and weather-resistant coating suitable for polymer substrates and its construction method according to claim 1, characterized in that: The weather-resistant and wear-resistant functional layer (1) comprises, by weight: 20-60 parts of aliphatic polyurea resin component A, 20-60 parts of aliphatic isocyanate curing agent component B, 10-50 parts of wear-resistant aggregate, and 1-5 parts of additives; the coating has an elongation at break of ≥100% and an adhesion to the polymer substrate (2) of ≥2MPa.

4. The anti-sand-cracking, weather-resistant coating suitable for polymer substrates and its construction method according to claim 1, characterized in that: The hard wear-resistant inorganic aggregate in the weather-resistant and wear-resistant functional layer (1) is completely encapsulated and solidified by aliphatic polyurea resin.

5. A weather-resistant, anti-sand-cracking coating suitable for polymer substrates and its construction method according to any one of claims 1-4, characterized in that: The process includes the following steps: S1. Substrate pretreatment: The surface of the polymer substrate (2) is cleaned, dried, and degreased to ensure that the substrate is clean; S2. Functional layer construction: On the clean surface of the polymer substrate (2), an aliphatic polyurea / aspartic polyurea functional layer doped with hard wear-resistant inorganic aggregate is directly coated. It can be formed as a single layer or as multiple layers separately, and cured at room temperature or under conventional curing conditions.

6. The anti-sand-cracking, weather-resistant coating suitable for polymer substrates and its construction method according to claim 5, characterized in that: The coating method described in step S2 includes one or more of the following: blade coating, roller coating, or spray coating.

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