A coating material, a modified glass fiber rod, its preparation method and application

Abstract

This invention discloses a coating material, a modified glass fiber rod, its preparation method, and its application, belonging to the field of coating material technology. The coating material includes a primer and a topcoat. The primer comprises the following components by weight: 3.5-4.0 parts of polyisocyanate A, 0.3-0.5 parts of epoxy vinyl ester resin, and 5-6 parts of a first organic solvent. The primer of this invention uses polyisocyanate as a crosslinking agent, making it suitable for non-aqueous systems. The first organic solvent, by dissolving the polyisocyanate and epoxy vinyl ester resin, reduces the surface tension of the primer, making it easier to wet the surface of the glass fiber rod compared to primers used in aqueous systems, thereby enhancing the adhesion of the primer to the glass fiber rod surface. Therefore, when the glass fiber rod treated with this coating material is laminated with a rubber matrix, the interfacial bonding force between the two is improved, preventing peeling or detachment at the interface.

Description

Technical Field

[0001] This invention relates to the field of coating materials technology, and in particular to a coating material, a modified glass fiber rod, its preparation method and application. Background Technology

[0002] Composite components for non-pneumatic tire support legs are used in non-pneumatic tire support structures to provide support and cushioning. Figure 1 A partial structural schematic diagram of a composite component for a non-pneumatic tire support leg is shown, including a rubber matrix 112 and glass fiber rods 111 distributed in the rubber matrix 112, wherein the glass fiber rods and the rubber matrix are bonded together by molding.

[0003] Because glass fiber rods have a smooth surface and are chemically inert, the interfacial bonding between them and rubber is weak, easily leading to debonding. To improve the interfacial bonding between glass fiber rods and rubber, Chinese patent document CN106832415A discloses a method for improving the interfacial bonding performance of glass short fiber / rubber composite materials. This method first treats the glass fiber surface with a silane coupling agent, and then performs a surface coating treatment with RFL impregnation solution, forming a two-phase transition layer between the glass fiber and the rubber matrix, improving interfacial compatibility, thereby improving the brittleness of the glass fiber and the bonding strength with the rubber matrix. However, resorcinol and formaldehyde in the RFL impregnation solution pose significant hazards to health and the production environment.

[0004] In the prior art, some environmentally friendly impregnation systems have been disclosed to replace the RFL impregnation system. For example, Chinese patent document CN112176729A discloses a nano-reinforced environmentally friendly impregnation system for fiber surface treatment. However, this impregnation system is not specifically designed for the surface treatment of glass fiber materials. Furthermore, the aforementioned impregnation system is an aqueous impregnation system, and the surface tension of an aqueous impregnation system is greater than that of the glass fiber rod. This makes it difficult for the impregnation liquid to spread on the glass fiber surface, resulting in poor adhesion of the interfacial layer to the glass fiber surface and hindering the effective improvement of the interfacial bonding force between the glass fiber rod and the rubber. Summary of the Invention

[0005] The purpose of this invention is to provide a coating material, a modified glass fiber rod, and its preparation method and application, aiming to solve the problem that existing fiber surface impregnation systems cannot be used for glass fiber surface treatment, and to improve the interfacial bonding force between the glass fiber rod and the rubber matrix.

[0006] To achieve the above objectives, the solution provided by the present invention is as follows:

[0007] The first aspect of the present invention provides a coating material comprising a primer and a topcoat, wherein the primer comprises the following components in parts by weight:

[0008] The composition includes 3.5–4.0 parts of polyisocyanate A, 0.3–0.5 parts of epoxy vinyl resin, and 5–6 parts of a first organic solvent. The epoxy vinyl resin is a bisphenol A type epoxy vinyl resin.

[0009] Optionally, the topcoat comprises the following components in parts by weight:

[0010] The mixture comprises 13-15 parts chain extender, 4-5 parts polyisocyanate B, 0.4-0.5 parts filler, 1.3-1.5 parts epoxy vinyl resin, and 140-142 parts second organic solvent. The epoxy vinyl resin is a bisphenol A type epoxy vinyl resin.

[0011] Optionally, the polyisocyanate A is composed of triphenylmethane triisocyanate and diisocyanate; the amount of diisocyanate is 25% to 30% of the total amount of triphenylmethane triisocyanate and diisocyanate.

[0012] Optionally, the first organic solvent is butanone.

[0013] Optionally, the polyisocyanate B is triphenylmethane triisocyanate.

[0014] Optionally, the chain extender is a polycaprolactone polyol; the polycaprolactone polyol includes at least one of polycaprolactone diol and polycaprolactone triol.

[0015] Optionally, the second organic solvent is toluene; the filler includes at least one of carbon black, silicon dioxide, and calcium carbonate.

[0016] A second aspect of the present invention provides a method for preparing a modified glass fiber rod, comprising the following steps:

[0017] S001. Grind the surface of the fiberglass rod;

[0018] S002. Apply a primer from the coating material to the polished fiberglass rod in one coat;

[0019] S003. The glass fiber rod coated with primer is dried to form a primer coating on the surface of the glass fiber rod;

[0020] S004. Apply a second coating to the glass fiber rod using the topcoat agent in the coating material;

[0021] S005. The glass fiber rod coated with the topcoat is dried to form a topcoat on the surface of the base coating, thereby obtaining the modified glass fiber rod.

[0022] A third aspect of the present invention provides a modified glass fiber rod, wherein the modified glass fiber rod is prepared by the same method as described above.

[0023] A fourth aspect of the present invention provides an application of a modified glass fiber rod, wherein the modified glass fiber rod is used to prepare a composite component for a non-pneumatic tire support leg, and the step of using the modified glass fiber rod to prepare the composite component for a non-pneumatic tire support leg includes:

[0024] F001. Cut the modified glass fiber rod into short glass fiber rods with a length of 30-60 mm;

[0025] F002. Short glass fiber rods and rubber matrix are placed in a mold and hot-pressed together using a vulcanizing machine to obtain a composite component for a non-pneumatic tire support leg. The process parameters of the vulcanizing machine are: pressure 10-15 MPa, upper plate temperature 95-100℃, lower plate temperature 145-150℃, and holding pressure vulcanization time 20 min.

[0026] The beneficial effects of this invention are as follows: A first aspect of this invention provides a coating material composed of a primer and a topcoat. The primer uses a polyisocyanate as a crosslinking agent, enabling it to be adapted to non-aqueous systems. A first organic solvent, by dissolving the polyisocyanate and epoxy vinyl ester resin, reduces the surface tension of the primer, making it easier to wet the surface of the glass fiber rod compared to primers used in aqueous systems, thereby enhancing the adhesion of the primer to the glass fiber rod surface. Consequently, when the glass fiber rod treated with this coating material is laminated with a rubber matrix, the interfacial bonding force between the two is improved, preventing peeling or detachment at the interface.

[0027] The second aspect of the present invention provides a method for preparing a modified glass fiber rod, wherein the surface of the glass fiber rod is modified by using a non-aqueous coating material to form a composite coating consisting of a base coating and a top coating. The composite coating has strong adhesion, thereby enhancing the interfacial bonding force between the rubber matrix and the glass fiber rod, and effectively preventing the interface between the two from peeling or falling off.

[0028] The third aspect of the present invention provides a modified glass fiber rod, which is prepared by the method described above. The surface of the modified glass fiber rod is formed with a composite coating consisting of a base coating and a top coating. The design of the base coating being relatively hard and the top coating being relatively soft can enhance the interfacial bonding force between the modified glass fiber rod and the rubber matrix, so that the modified glass fiber rod can be composited with the rubber matrix to form a high-performance composite component for non-pneumatic tire support legs.

[0029] The fourth aspect of this invention provides an application of a modified glass fiber rod, enabling the modified glass fiber rod to be used in the preparation of composite components for non-pneumatic tire support legs. The preparation method of the composite component is simple and the quality is controllable, allowing for rapid production of composite components suitable for non-pneumatic tire support legs. Furthermore, this preparation method can be integrated with the aforementioned preparation method for the modified glass fiber rod, thereby establishing a complete production line. This solves the problem of weak interfacial bonding between the glass fiber rod and rubber, and also improves the production efficiency of composite components for non-pneumatic tire support legs. Attached Figure Description

[0030] Figure 1 This is a partial structural diagram of a composite component used for a non-pneumatic tire support leg.

[0031] Figure 2 This is a flowchart of the preparation method of the modified glass fiber rod provided by the present invention.

[0032] Figure 3 This is a flowchart illustrating the use of the modified glass fiber rod in the fabrication of a composite component for a non-pneumatic tire support leg. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] A first aspect of this invention provides a coating material for modifying the surface of a glass fiber rod, comprising a primer and a topcoat. The primer is applied to the surface of the glass fiber rod to form a base coating layer; the topcoat is applied to the surface of the base coating layer to form a composite coating layer consisting of the primer and topcoat layers on the surface of the glass fiber rod. By using this coating material to modify the glass fiber rod, it is possible to composite the glass fiber rod with a rubber matrix, thereby enabling its use in the fabrication of composite components for non-pneumatic tire support legs.

[0035] Furthermore, the primer comprises the following components in parts by weight: 3.5 to 4.0 parts of polyisocyanate A, 0.3 to 0.5 parts of epoxy vinyl resin, and 5 to 6 parts of a first organic solvent.

[0036] In the primer provided by this invention, the isocyanate used is a polyisocyanate. Polyisocyanates contain two or more isocyanate groups (-NCO), exhibiting higher reactivity. Therefore, polyisocyanates can rapidly complete the crosslinking reaction without requiring high reaction temperatures, making them more suitable for non-aqueous primers compared to blocked isocyanates, thus meeting the requirement for rapid film formation after coating. The first organic solvent is used to dissolve the polyisocyanate and epoxy vinyl ester resin, ensuring that the viscosity of the primer is not too high, facilitating uniform coating of the primer onto the surface of the glass fiber rod. Furthermore, the first organic solvent reduces the surface tension of the primer, making the primer provided by this invention more effective at wetting the surface of the glass fiber rod compared to aqueous primers. This enhances the adhesion of the primer to the glass fiber rod surface, resulting in improved interfacial bonding between the modified glass fiber rod and the rubber matrix, making it less prone to peeling or detachment at the interface.

[0037] In the primer provided by this invention, the epoxy vinyl resin is selected from bisphenol A type epoxy vinyl resin, whose molecular structure contains hydroxyl groups that can react with polyisocyanates; at the same time, the long-chain molecular structure of bisphenol A type epoxy vinyl resin can be embedded in the cross-linked network formed by isocyanates, playing a "toughening" role, so that the primer coating reduces brittleness while maintaining a certain hardness, thereby better adapting to the deformation generated by the glass fiber rod during bending or stress.

[0038] Optionally, the topcoat comprises the following components in parts by weight:

[0039] Chain extender 13-15 parts, polyisocyanate B 4-5 parts, filler 0.4-0.5 parts, epoxy vinyl resin 1.3-1.5 parts, second organic solvent 140-142 parts.

[0040] In the topcoat provided by this invention, the isocyanate is also a polyisocyanate, thereby enabling the topcoat to be adapted to non-aqueous systems. The second organic solvent, serving as the solvent for the non-aqueous topcoat, reduces the viscosity of the topcoat to facilitate application and enhances the wettability of the topcoat on the base layer during application. This results in a stronger adhesion between the topcoat and the base layer after the topcoat forms a film. When the modified glass fiber rod is laminated with the rubber matrix, the interfacial bonding force between the two is further improved, effectively preventing the glass fiber rod from peeling off from the rubber matrix.

[0041] In the topcoat provided by this invention, the epoxy vinyl resin is also selected as bisphenol A type epoxy vinyl resin. Polyisocyanate can undergo a cross-linking reaction with it, forming a three-dimensional network structure within the topcoat, thereby enhancing the interfacial bonding between the topcoat, the basecoat, and the rubber matrix. The filler can reduce the modulus of the topcoat, preventing stress concentration between the topcoat and the rubber matrix and preventing a decrease in interfacial bonding. The chain extender can react with polyisocyanate to form "bridges" between polymer chains to extend the molecular chains. Simultaneously, because bisphenol A type epoxy vinyl resin has a long-chain molecular structure, the distance between cross-linking points increases as the molecular chains extend, thereby reducing the resistance to molecular chain segment movement and giving the topcoat a certain degree of flexibility compared to the basecoat. The design of a harder basecoat and a softer topcoat results in a stress transition at the interface between the modified glass fiber rod and the rubber matrix. When the composite component of the non-pneumatic tire support leg is subjected to cyclic loading pressure test, no obvious stress concentration area appears at the interface between the glass fiber rod and the rubber matrix. This enhances the interfacial bonding force between the rubber matrix and the glass fiber rod, preventing the interface from peeling or falling off.

[0042] Optionally, in the primer provided by this invention, polyisocyanate A is composed of triphenylmethane triisocyanate and diisocyanate. Triphenylmethane triisocyanate contains three isocyanate groups, exhibiting high reactivity and capable of cross-linking with hydroxyl groups in the primer system (such as those introduced by bisphenol A type epoxy vinyl resin), thereby increasing the hardness of the primer layer. Diisocyanate contains two isocyanate groups, which synergistically work with triphenylmethane triisocyanate to avoid excessive cross-linking caused by the introduction of a single high-functionality isocyanate, ensuring that the primer layer maintains a certain level of hardness without significantly increasing brittleness. Furthermore, the linear structure of diisocyanate can introduce "flexible segments" into the cross-linking network, lowering the glass transition temperature (Tg) of the primer layer and ensuring that the primer layer retains a certain degree of ductility even at high hardness, reducing interfacial stress concentration caused by excessive rigidity of the primer layer.

[0043] To ensure that the base coating maintains a certain level of hardness without significantly increasing its brittleness, this invention found that the optimal effect can be achieved when the amount of diisocyanate accounts for 25% to 30% of the total amount of triphenylmethane triisocyanate and diisocyanate.

[0044] Optionally, in the primer provided by the present invention, the first organic solvent is methyl ethyl ketone (MEK). As a polar solvent, MEK can effectively dissolve highly polar triphenylmethane triisocyanate and diisocyanate, reducing the viscosity of the primer, enhancing its fluidity, enabling it to uniformly wet the surface of the glass fiber rod, ensuring uniform coating thickness, and thus improving the adhesion between the primer and the substrate.

[0045] Optionally, in the topcoat provided by this invention, polyisocyanate B is triphenylmethane triisocyanate. Triphenylmethane triisocyanate has high reactivity and can form an initial cross-linked structure in a short time (e.g., in the early stage of drying) when drying glass fiber rods coated with primer and topcoat, thereby reducing the risk of coating sagging or deformation, and thus strengthening the interfacial bonding between coatings, between coatings and glass fiber rods, and between coatings and rubber matrix.

[0046] Optionally, in the topcoat provided by the present invention, the chain extender is polycaprolactone polyol; the polycaprolactone polyol includes at least one of polycaprolactone diol and polycaprolactone triol. The main chain of the above-mentioned polycaprolactone polyol is composed of -O-(CH2)5-CO- repeating units, which has strong flexibility. When polycaprolactone polyol is incorporated into the topcoat system, its flexible chain segments can act as "molecular plasticizers" to insert into the crosslinking network, weakening the hydrogen bonds and van der Waals forces between molecules, making the chain segments of the topcoat more likely to slip under stress, thereby reducing the hardness of the topcoat and improving its flexibility.

[0047] Optionally, in the topcoat provided by the present invention, the second organic solvent is toluene. As a non-polar solvent, toluene has better compatibility with chain extenders with weaker polarity. Therefore, when the amount of chain extender in the topcoat is large, using toluene as an organic solvent can reduce the viscosity of the topcoat, avoid the agglomeration of high proportion chain extenders, allow the topcoat to spread smoothly on the base layer, reduce the generation of bubbles, and thus ensure the smoothness of the topcoat, which is beneficial to strengthening the interfacial bonding force between coatings and between the coating and the rubber matrix.

[0048] Optionally, in the topcoat provided by the present invention, the filler includes at least one selected from carbon black, silicon dioxide, and calcium carbonate. Preferably, the filler is carbon black. Carbon black not only reduces the modulus of the topcoat and avoids stress concentration between the topcoat and the rubber matrix, but also its color is close to that of the rubber matrix. When a glass fiber rod with a composite coating on its surface is combined with a rubber matrix to form a composite component, the overall aesthetics of the composite component can be maintained.

[0049] like Figure 2 As shown, a second aspect of the present invention provides a method for preparing a modified glass fiber rod, comprising the following steps:

[0050] S001. Grind the surface of the fiberglass rod;

[0051] S002. Apply a primer from the coating material to the polished fiberglass rod in one coat;

[0052] S003. The glass fiber rod coated with primer is dried to form a primer coating on the surface of the glass fiber rod;

[0053] S004. Apply a second coating to the glass fiber rod using the topcoat agent in the coating material;

[0054] S005. The glass fiber rod coated with the topcoat is dried to form a topcoat on the surface of the base coating, thereby obtaining the modified glass fiber rod.

[0055] The second aspect of the present invention provides a method for preparing a modified glass fiber rod, wherein the surface of the glass fiber rod is modified by using a non-aqueous coating material to form a composite coating consisting of a base coating and a top coating with strong adhesion, thereby enhancing the interfacial bonding force between the rubber matrix and the glass fiber rod and effectively preventing the interface between the two from peeling or falling off.

[0056] Furthermore, in step S001 above, grinding the surface of the fiberglass rod can increase its surface roughness and create more microscopic uneven structures on the surface. When a primer is applied to the surface of the fiberglass rod, the primer can embed into the aforementioned microscopic uneven structures and mechanically engage with the surface of the fiberglass rod, thereby making the resulting primer layer adhere more firmly to the surface of the fiberglass rod and less prone to falling off.

[0057] Furthermore, in step S003 above, the drying temperature is 60–80°C and the drying time is 20–60 min; in step S005, the drying temperature is 60–80°C and the drying time is 20–60 min. These temperature and time parameters ensure that the solvents in the primer and topcoat fully evaporate, preventing defects such as stickiness or bubbles in the primer and topcoat layers. Simultaneously, they ensure sufficient cross-linking of the polyisocyanate and epoxy vinyl ester resin, thereby guaranteeing the interfacial bonding strength between coatings, between the coating and the glass fiber rod, and between the coating and the rubber matrix.

[0058] The third aspect of the present invention provides a modified glass fiber rod, which is prepared by the method described above. The surface of the modified glass fiber rod is formed with a composite coating consisting of a base coating and a top coating. The design of the base coating being relatively hard and the top coating being relatively soft can enhance the interfacial bonding force between the modified glass fiber rod and the rubber matrix, so that the modified glass fiber rod can be composited with the rubber matrix to form a high-performance composite component for non-pneumatic tire support legs.

[0059] like Figure 3 As shown, a fourth aspect of the present invention provides an application of a modified glass fiber rod, wherein the aforementioned modified glass fiber rod is used to prepare a composite component for a non-pneumatic tire support leg. The composite component for a non-pneumatic tire support leg includes a rubber matrix and a modified glass fiber rod. The method for preparing the composite component for a non-pneumatic tire support leg includes the following steps:

[0060] F001. Cut the modified glass fiber rod into short glass fiber rods with a length of 30-60mm. In this step, the length of the short glass fiber rods can be adjusted based on the actual specifications of the non-pneumatic tire.

[0061] F002. Short glass fiber rods and rubber matrix are placed in a mold and hot-pressed together to obtain the composite material component for non-pneumatic tire support legs.

[0062] The method for preparing composite components for non-pneumatic tire support legs provided by this invention is simple, has controllable quality, and can quickly produce composite components suitable for non-pneumatic tire support legs. At the same time, this preparation method can be used in conjunction with the aforementioned method for preparing modified glass fiber rods, thereby establishing a complete production line. This not only solves the problem of weak interfacial bonding between glass fiber rods and rubber, but also improves the production efficiency of composite components for non-pneumatic tire support legs.

[0063] Optionally, in step F002, a vulcanizing machine is used to hot-press the short glass fiber rod and the rubber matrix together. The process parameters of the vulcanizing machine are: pressure 10-15 MPa, upper plate temperature 95-100℃, lower plate temperature 145-150℃, and pressure holding vulcanization time 20 min. During the bonding process, the short glass fiber rod is located below the rubber matrix.

[0064] The following examples and comparative examples further illustrate the present invention. The raw materials used in the following examples and comparative examples are from the following sources: triphenylmethane triisocyanate (Hubei Jiufenglong); diisocyanate (Shandong Yuxuan); bisphenol A type epoxy vinyl resin (Liliansi ATLAC430); methyl ethyl ketone (Maoming Runjing Chemical); polycaprolactone triol (Shuer); polycaprolactone diol (Shanghai Hongzhuang Chemical); toluene (Maoming Xiongda Chemical); chloroprene rubber paste (DJC-404); triethylamine (Youwang Chemical); dimethylolpropionic acid (Feichi Chemical).

[0065] Example 1

[0066] This embodiment provides a coating material, including a primer and a topcoat. The primer is prepared from the following raw materials in parts by weight: 2.5 parts triphenylmethane triisocyanate, 1.0 part diisocyanate, 0.5 parts bisphenol A type epoxy vinyl resin, and 6 parts methyl ethyl ketone.

[0067] The raw materials for preparing the topcoat consist of the following parts by weight: 15 parts polycaprolactone triol, 5 parts triphenylmethane triisocyanate, 0.5 parts carbon black, 1.5 parts bisphenol A type epoxy vinyl resin, and 142 parts toluene.

[0068] This embodiment also provides a modified glass fiber rod and its preparation method, wherein the preparation method of the modified glass fiber rod includes the following steps:

[0069] S001. Grind the surface of the fiberglass rod;

[0070] S002. Apply a primer from the coating material to the polished fiberglass rod in one coat;

[0071] S003. The glass fiber rod coated with the primer is dried to form a primer coating on the surface of the glass fiber rod. In this step, the drying temperature is 80°C and the drying time is 40 min.

[0072] S004. Apply a second coating to the glass fiber rod using the topcoat agent in the coating material;

[0073] S005. The glass fiber rod coated with the topcoat is dried to form a topcoat on the surface of the base coating, thereby obtaining the modified glass fiber rod. In this step, the drying temperature is 80°C and the drying time is 40 minutes.

[0074] Example 2

[0075] This embodiment provides a coating material, including a primer and a topcoat. The primer is prepared from the following raw materials in parts by weight: 2.625 parts of triphenylmethane triisocyanate, 0.875 parts of diisocyanate, 0.3 parts of bisphenol A type epoxy vinyl resin, and 6 parts of methyl ethyl ketone.

[0076] The raw materials for preparing the topcoat consist of the following parts by weight: 13 parts polycaprolactone diol, 4 parts triphenylmethane triisocyanate, 0.5 parts carbon black, 1.3 parts bisphenol A type epoxy vinyl resin, and 140 parts toluene.

[0077] This embodiment also provides a modified glass fiber rod and its preparation method, wherein the preparation method of the modified glass fiber rod includes the following steps:

[0078] S001. Grind the surface of the fiberglass rod;

[0079] S002. Apply a primer from the coating material to the polished fiberglass rod in one coat;

[0080] S003. The glass fiber rod coated with the primer is dried to form a primer coating on the surface of the glass fiber rod. In this step, the drying temperature is 60°C and the drying time is 60 min.

[0081] S004. Apply a second coating to the glass fiber rod using the topcoat agent in the coating material;

[0082] S005. The glass fiber rod coated with the topcoat is dried to form a topcoat on the surface of the base coating, thereby obtaining the modified glass fiber rod. In this step, the drying temperature is 60°C and the drying time is 60 min.

[0083] Example 3

[0084] This embodiment provides a coating material, including a primer and a topcoat. The primer is prepared from the following raw materials in parts by weight: 2.8 parts triphenylmethane triisocyanate, 1.2 parts diisocyanate, 0.4 parts bisphenol A type epoxy vinyl resin, and 5 parts methyl ethyl ketone.

[0085] The raw materials for preparing the topcoat consist of the following parts by weight: 14 parts polycaprolactone triol, 5 parts triphenylmethane triisocyanate, 0.5 parts carbon black, 1.5 parts bisphenol A type epoxy vinyl resin, and 142 parts toluene.

[0086] This embodiment also provides a modified glass fiber rod and its preparation method, wherein the preparation method of the modified glass fiber rod includes the following steps:

[0087] S001. Grind the surface of the fiberglass rod;

[0088] S002. Apply a primer from the coating material to the polished fiberglass rod in one coat;

[0089] S003. The glass fiber rod coated with the primer is dried to form a primer coating on the surface of the glass fiber rod. In this step, the drying temperature is 80°C and the drying time is 40 min.

[0090] S004. Apply a second coating to the glass fiber rod using the topcoat agent in the coating material;

[0091] S005. The glass fiber rod coated with the topcoat is dried to form a topcoat on the surface of the base coating, thereby obtaining the modified glass fiber rod. In this step, the drying temperature is 80°C and the drying time is 40 minutes.

[0092] Comparative Example 1

[0093] This comparative example provides a coating material, including a primer and a topcoat. The primer is prepared from the following raw materials in parts by weight: 2.5 parts triphenylmethane triisocyanate, 0.5 parts dimethylolpropionic acid, 0.37 parts triethylamine, and 6.63 parts deionized water.

[0094] The raw materials for preparing the topcoat are the same as those for preparing the topcoat provided in Example 1.

[0095] This comparative example also provides a modified glass fiber rod and its preparation method, wherein the preparation method of the modified glass fiber rod is the same as the preparation method provided in Example 1.

[0096] Comparative Example 2

[0097] This comparative example provides a coating material, including a primer and a topcoat. The primer is prepared from the following raw materials in parts by weight: 2.8 parts triphenylmethane triisocyanate, 0.7 parts diisocyanate, 0.5 parts bisphenol A type epoxy vinyl resin, and 6 parts methyl ethyl ketone.

[0098] The raw materials for preparing the topcoat are the same as those for preparing the topcoat provided in Example 1.

[0099] This comparative example also provides a modified glass fiber rod and its preparation method, wherein the preparation method of the modified glass fiber rod is the same as the preparation method provided in Example 1.

[0100] Comparative Example 3

[0101] This comparative example provides a coating material, including a primer and a topcoat. The primer is prepared from the following raw materials in parts by weight: 2.275 parts triphenylmethane triisocyanate, 1.225 parts diisocyanate, 0.5 parts bisphenol A type epoxy vinyl resin, and 6 parts butanone.

[0102] The raw materials for preparing the topcoat are the same as those for preparing the topcoat provided in Example 1.

[0103] This comparative example also provides a modified glass fiber rod and its preparation method, wherein the preparation method of the modified glass fiber rod is the same as the preparation method provided in Example 1.

[0104] Comparative Example 4

[0105] This comparative example provides a coating material, including a primer and a topcoat, wherein the raw materials for preparing the primer are the same as those for preparing the primer provided in Example 1.

[0106] The raw materials for preparing the topcoat consist of the following parts by weight: 15 parts polycaprolactone triol, 5 parts triphenylmethane triisocyanate, 0.5 parts carbon black, 2.0 parts bisphenol A type epoxy vinyl resin, and 142 parts toluene.

[0107] This comparative example also provides a modified glass fiber rod and its preparation method, wherein the preparation method of the modified glass fiber rod is the same as the preparation method provided in Example 1.

[0108] Comparative Example 5

[0109] This comparative example provides a coating material, including a primer and a topcoat, wherein the raw materials for preparing the primer are the same as those for preparing the primer provided in Example 1.

[0110] The raw materials for preparing the topcoat consist of the following parts by weight: 10 parts polycaprolactone triol, 5 parts triphenylmethane triisocyanate, 0.5 parts carbon black, 1.5 parts bisphenol A type epoxy vinyl resin, and 142 parts toluene.

[0111] This comparative example also provides a modified glass fiber rod and its preparation method, wherein the preparation method of the modified glass fiber rod is the same as the preparation method provided in Example 1.

[0112] Comparative Example 6

[0113] This comparative example provides a coating material, including a primer and a topcoat. The primer is prepared from the following raw materials in parts by weight: 2.5 parts triphenylmethane triisocyanate, 1.5 parts chloroprene adhesive, and 6 parts methyl ethyl ketone.

[0114] The raw materials for preparing the topcoat consist of the following parts by weight: 15 parts polycaprolactone triol, 6.5 parts triphenylmethane triisocyanate, 0.5 parts carbon black, and 142 parts toluene.

[0115] This comparative example also provides a modified glass fiber rod and its preparation method, wherein the preparation method of the modified glass fiber rod is the same as the preparation method provided in Example 1.

[0116] A 90° peel test was performed on the modified glass fiber rod provided above to measure the force required for the rubber and glass fiber rod to peel apart, thus characterizing the interfacial bonding ability between the glass fiber rod and the rubber. The test reference standard was GB / T 7760-2003 "Determination of Adhesion Strength of Vulcanized Rubber or Thermoplastic Rubber to Rigid Sheets - 90° Peel Method", and the testing equipment was a universal tensile testing machine. The dimensions of the modified glass fiber rod used in the test were 60*25*2mm (length*width*thickness). Before the test, the modified glass fiber rod and the rubber matrix were placed in a mold and hot-pressed together using a vulcanizing machine to obtain the test sample (during hot-pressing, the glass fiber rod was positioned above the rubber matrix, the upper plate temperature of the vulcanizing machine was 100℃, the lower plate temperature was 150℃, the composite pressure was 15MPa, and the holding pressure vulcanization time was 20min).

[0117] The test results are shown in the table below:

[0118]

[0119] The peel bond strength between the glass fiber rod and the rubber matrix is ​​higher than that of the modified glass fiber rod and the rubber matrix provided in each comparative example, indicating that the interfacial bonding force between the modified glass fiber rod and the rubber matrix provided in Examples 1-3 is strong, the performance of the modified glass fiber rod is excellent, and it meets the usage requirements of composite material components for non-pneumatic tire support legs.

[0120] Further comparison of Comparative Example 1 and Example 1 revealed that the peel bond strength between the modified glass fiber rod and the rubber matrix provided in Comparative Example 1 was significantly lower than that in Example 1. This indicates that the interfacial bonding force between the modified glass fiber rod and the rubber matrix provided in Comparative Example 1 is weak. This is because Comparative Example 1 used an aqueous primer during the surface modification of the glass fiber rod. The aqueous primer has poor wettability on the surface of the glass fiber rod, resulting in weak adhesion between the primer and topcoat layers to the glass fiber rod, making it easy for the modified glass fiber rod to peel off from the rubber matrix.

[0121] Further comparison of Comparative Example 2 and Example 1 revealed that the peel bond strength between the modified glass fiber rod and the rubber matrix provided in Comparative Example 2 was lower than that in Example 1. This indicates that the interfacial bonding force between the modified glass fiber rod and the rubber matrix provided in Comparative Example 2 was weaker. This is because, during the surface modification of the glass fiber rod in Comparative Example 2, the proportion of diisocyanate in the primer used in Comparative Example 2 was less than 25% of the total amount of polyisocyanate in the primer, which resulted in an increase in brittleness while maintaining a certain hardness of the primer coating.

[0122] Further comparison of Comparative Example 3 and Example 1 revealed that the peel bond strength between the modified glass fiber rod and the rubber matrix provided in Comparative Example 3 was lower than that in Example 1. This indicates that the interfacial bonding force between the modified glass fiber rod and the rubber matrix provided in Comparative Example 3 was weaker. This is because, during the surface modification of the glass fiber rod in Comparative Example 3, the amount of diisocyanate in the primer used in Comparative Example 3 exceeded 30% of the total amount of polyisocyanate in the primer, resulting in insufficient rigidity of the primer layer and easy cracking.

[0123] Further comparison of Comparative Example 4 and Example 1 revealed that the peel bond strength between the modified glass fiber rod and the rubber matrix provided in Comparative Example 4 was significantly lower than that in Example 1. This indicates that the interfacial bonding force between the modified glass fiber rod and the rubber matrix provided in Comparative Example 4 was weaker. This is because, in the process of modifying the surface of the glass fiber rod in Comparative Example 4, the amount of epoxy vinyl ester resin used in the topcoat was greater than that in Example 1, resulting in a decrease in the flexibility of the topcoat and thus a weaker bonding force between the rubber matrix and the topcoat.

[0124] Further comparison of Comparative Example 5 and Example 1 revealed that the peel bond strength between the modified glass fiber rod and the rubber matrix provided by Comparative Example 5 was lower than that of Example 1. This is because the amount of chain extender used in the topcoat of Comparative Example 5 during the surface modification of the glass fiber rod was less than that in Example 1, resulting in a decrease in the flexibility of the topcoat and a weaker bond between the rubber matrix and the topcoat.

[0125] Further comparison of Comparative Example 6 and Example 1 revealed that the peel bond strength of the modified glass fiber rod and rubber matrix provided by Comparative Example 6 was significantly lower than that of Example 1. This is because, during the surface modification of the glass fiber rod, neither the primer nor the topcoat used in Comparative Example 6 used epoxy vinyl ester resin, resulting in insufficient three-dimensional network cross-linking structure in the primer and topcoat layers, which led to weaker interfacial bonding between the coatings and between the coating and the rubber matrix.

[0126] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A coating material, characterized in that, The product includes a primer and a topcoat. The primer comprises the following components in parts by weight: 3.5-4.0 parts of polyisocyanate A, 0.3-0.5 parts of epoxy vinyl resin, and 5-6 parts of a first organic solvent. The topcoat comprises the following components in parts by weight: 13-15 parts of chain extender, 4-5 parts of polyisocyanate B, 0.4-0.5 parts of filler, 1.3-1.5 parts of epoxy vinyl resin, and 140-142 parts of a second organic solvent. The polyisocyanate A is composed of triphenylmethane triisocyanate and diisocyanate; the amount of diisocyanate accounts for 25% to 30% of the total amount of triphenylmethane triisocyanate and diisocyanate. The first organic solvent is butanone; The polyisocyanate B is triphenylmethane triisocyanate; The chain extender is polycaprolactone polyol; The second organic solvent is toluene.

2. The coating material according to claim 1, characterized in that, The polycaprolactone polyol includes at least one of polycaprolactone diol and polycaprolactone triol.

3. The coating material according to claim 1, characterized in that, The filler includes at least one of carbon black, silicon dioxide, and calcium carbonate.

4. A method for preparing a modified glass fiber rod, characterized in that, Includes the following steps: S001. Grind the surface of the fiberglass rod; S002. Apply a primer coating to the polished glass fiber rod using the coating material described in any one of claims 1-3; S003. The glass fiber rod coated with primer is dried to form a primer coating on the surface of the glass fiber rod; S004. The glass fiber rod is coated a second time using the topcoat agent in the coating material according to any one of claims 1-3; S005. The glass fiber rod coated with the topcoat is dried to form a topcoat on the surface of the base coating, thereby obtaining the modified glass fiber rod.

5. A modified glass fiber rod, characterized in that, The modified glass fiber rod is prepared by the method described in claim 4.

6. An application of the modified glass fiber rod as described in claim 5, characterized in that, The modified glass fiber rod is used to prepare a composite component for a non-pneumatic tire support leg. The steps of using the modified glass fiber rod to prepare a composite component for a non-pneumatic tire support leg include: F001. Cut the modified glass fiber rod into short glass fiber rods with a length of 30-60 mm; F002. Short glass fiber rods and rubber matrix are placed in a mold and hot-pressed together using a vulcanizing machine to obtain a composite component for non-pneumatic tire support legs.

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