Energy-saving heat preservation cover for tire mold and preparation method of energy-saving heat preservation cover

Abstract

The invention relates to a tire mold energy-saving heat preservation cover and a preparation method thereof, and belongs to the technical field of composite materials. Aromatic rings and imide rings with good heat resistance are introduced into a novolac epoxy resin framework, so that the heat resistance of the novolac epoxy vinyl resin is effectively improved, and the application range of the novolac epoxy vinyl resin in a long-term high-temperature environment is widened; the introduced aromatic ring and imide ring can jointly construct a molecular skeleton containing a Diels-Alder six-membered ring in the structure, so that the phenolic epoxy vinyl resin has thermal repair capacity in a high-temperature environment, and the problem that the thermal resistance of the energy-saving heat preservation cover for the tire mold is reduced due to resin aging and interface debonding in a long-term high-temperature working environment is effectively relieved.

Description

Technical Field

[0001] This invention belongs to the field of composite material technology, specifically relating to an energy-saving and heat-insulating cover for a tire mold and its preparation method. Background Technology

[0002] Energy-saving and heat-insulating covers for tire molds are an important energy-saving and consumption-reducing device in the tire manufacturing industry. Their core function is to wrap around the high-temperature tire mold surface after the tire has completed vulcanization and demolding, utilizing their excellent heat insulation properties to slow down the cooling rate of the tire and thus efficiently utilize the residual heat carried by the tire itself. This measure not only significantly reduces the overall energy consumption of the vulcanization process but also improves the workshop working environment and helps to improve the uniformity of tire quality.

[0003] The demolding temperature for tire processing is typically above 150℃, and the insulation cover needs to withstand this high-temperature environment repeatedly and for extended periods. Under long-term thermo-oxidative aging, the molecular chains of traditional resin matrices degrade, and the degree of cross-linking changes, leading to the material gradually becoming brittle, pulverizing, and experiencing a decrease in mechanical strength. More importantly, the degradation of the matrix resin weakens the interfacial bonding force between it and the glass fiber mat, resulting in an "interfacial debonding" phenomenon, leading to an irreversible and continuous decrease in thermal resistance. To address these technical deficiencies, this invention provides an energy-saving insulation cover for tire molds and its preparation method. Summary of the Invention

[0004] The purpose of this invention is to provide an energy-saving heat insulation cover for tire molds and its preparation method. It uses nano-level heat insulation felt and a resin shell with low thermal conductivity, providing double heat insulation and achieving an energy-saving efficiency of 20% to 30%. The fully enclosed shell design accurately locks in the temperature, ensuring stable operation of the equipment. It can also completely block harmful gases generated by the high-temperature heating of the insulation material and prevent carbonized dust from entering the rubber products.

[0005] The objective of this invention can be achieved through the following technical solutions: A method for preparing an energy-saving and heat-insulating cover for a tire mold includes the following steps: Step 1: The 4-hydroxyphthalic anhydride is reacted with 3,4-diaminofuran via an amidation reaction to obtain a diene; The preparation process is as follows: 4-hydroxyphthalic anhydride, 3,4-diaminofuran and dimethyl sulfoxide are mixed in a reaction vessel and reacted at 140-160℃ for 6-10 h. After the reaction is completed, the reaction solution is cooled to room temperature and poured into deionized water to precipitate. After filtering to separate the solid, the diene is obtained by silica gel column chromatography.

[0006] The second step involves reacting the diene with paraformaldehyde to obtain diene phenolic resin. The preparation process is as follows: Under nitrogen protection, diene, paraformaldehyde, zinc acetate and N,N-dimethylacetamide are mixed in a reaction vessel and reacted at 120-140℃ for 8-10 hours. After the reaction is completed, the reaction solution is poured into deionized water to precipitate. After filtering to separate the solid, the obtained solid is washed with deionized water and dried to obtain diene phenolic resin.

[0007] The third step involves reacting 4-maleimide-phenol with paraformaldehyde to obtain dienophilic phenolic resin. The preparation process is as follows: 4-maleimide phenol, paraformaldehyde, zinc acetate, and N,N-dimethylacetamide are mixed in a reaction vessel under nitrogen protection and reacted at 100-120℃ for 5-8 hours. After the reaction is completed, the reaction solution is poured into deionized water to precipitate. After filtering to separate the solid, the obtained solid is washed with deionized water and dried to obtain dienophilic phenolic resin.

[0008] Step 4: React diene phenolic resin, diene-philic phenolic resin, and epichlorohydrin to obtain heat-repairing phenolic epoxy resin; The preparation process is as follows: Under nitrogen protection, diene phenolic resin, diene-philic phenolic resin, and epichlorohydrin are mixed in a reaction vessel and reacted at 80-120℃ for 5-8 hours. Sodium hydroxide is added to the system in batches during the reaction. After the reaction is completed, deionized water is added to the system for washing. Then, the organic phase is separated and excess epichlorohydrin is removed by rotary evaporation to obtain the heat-repaired phenolic epoxy resin.

[0009] Step 5: After the heat-repairing phenolic epoxy resin, methacrylic acid, and catalyst undergo a ring-opening addition reaction, styrene and a polymerization inhibitor are added to the system to obtain the heat-repairing phenolic epoxy vinyl resin.

[0010] Styrene, used as a solvent, not only dilutes the resin, reduces viscosity, and facilitates handling and impregnation of glass fibers, but also acts as a crosslinking agent to react with phenolic epoxy vinyl resin, forming a "bridge" to obtain a three-dimensional crosslinked network.

[0011] Step 6: Mix the heat-repairing phenolic epoxy vinyl resin, initiator, accelerator, filler, silane coupling agent, and functional additives to obtain a resin slurry for later use. Then, pour the resin slurry into a mold that has been pre-coated with a release agent, and lay a layer of glass fiber mat. After that, press to remove air bubbles, and repeat the process of pouring resin-laying fiber-pressing to remove air bubbles until the designed thickness is reached. After curing, the tire mold energy-saving heat insulation cover is obtained.

[0012] The accelerator reacts with the initiator, causing the initiator to decompose into two free radicals. These free radicals attack the carbon-carbon double bonds in the thermally repaired phenolic epoxy vinyl resin, initiating chain polymerization and causing the linear long-chain molecules to cross-link and solidify.

[0013] Silane coupling agents can establish strong "molecular bridges" between hydrophilic glass fibers and hydrophobic resin matrices, greatly improving interfacial adhesion and significantly enhancing the mechanical strength, water resistance, and aging resistance of the product.

[0014] Furthermore, the catalyst is an organic amine catalyst, including at least one of N,N-dimethylbenzylamine, triethylamine, and triethylenediamine.

[0015] Furthermore, the polymerization inhibitor is at least one of hydroquinone and methylhydroquinone.

[0016] Furthermore, the initiator is methyl ethyl ketone peroxide.

[0017] Furthermore, the accelerator is cobalt isooctanoate.

[0018] Furthermore, the filler is at least one of fumed silica, calcium carbonate, talc, and aluminum hydroxide.

[0019] Furthermore, the silane coupling agent is KH-570.

[0020] Furthermore, the functional additive is at least one of ultraviolet absorbers and flame retardants.

[0021] Furthermore, the release agent is an organosilicon-based release agent.

[0022] Furthermore, the ring-opening addition reaction is carried out at a temperature of 100–120°C until the acid value of the system is ≤12 mg KOH / g.

[0023] Furthermore, the curing conditions are as follows: curing at room temperature for 24 hours, followed by curing at a temperature of 100-120°C for 2-3 hours.

[0024] Energy-saving and heat-insulating cover for tire molds obtained by any of the above steps.

[0025] The beneficial effects of this invention are: 1) This invention effectively improves the heat resistance of phenolic epoxy vinyl resin by introducing aromatic rings and imide rings with good heat resistance into the phenolic epoxy resin skeleton, thus broadening the application of phenolic epoxy vinyl resin in long-term high-temperature environments.

[0026] 2) This invention utilizes two types of phenolic resins, one containing a diene (furan ring) and the other a dienophile (maleimide ring), to jointly construct a phenolic epoxy resin skeleton containing a Diels-Alder six-membered ring. This endows the phenolic epoxy vinyl resin with thermal repair capabilities under high-temperature environments, effectively alleviating the problem of decreased thermal resistance caused by resin aging and interface debonding in tire mold energy-saving insulation covers under long-term high-temperature working conditions. After introducing the thermal repair phenolic epoxy resin skeleton, the phenolic epoxy resin skeleton in the tire mold energy-saving insulation cover can break the formed Diels-Alder six-membered ring after the system temperature reaches 130-150℃, improving the local fluidity of the phenolic epoxy vinyl resin, repairing aging damage caused by long-term high temperatures, and re-wetting the glass fiber felt interface. Furthermore, when the system temperature drops again, the Diels-Alder six-membered ring can be re-formed to restore the cross-linking structure of the phenolic epoxy vinyl resin and the mechanical strength of the tire mold energy-saving insulation cover.

[0027] 3) The diene designed in this invention has a large steric hindrance after forming the Diels-Alder six-membered ring. This design can ensure that the double bonds in the already formed Diels-Alder six-membered ring will not participate in the double bond curing reaction in the phenolic epoxy vinyl resin, thus ensuring the thermal repair capability of the material.

[0028] 4) The heat insulation cover material prepared by this invention has excellent heat insulation effect and low thermal conductivity, which effectively ensures the heat insulation requirements of the tire mold and further achieves energy saving effect. In addition, using phenolic epoxy vinyl resin as the base material, combined with glass fiber felt and other materials, ensures the strength of the heat insulation cover material in product application, and significantly improves its impact resistance and high temperature resistance. At the same time, the tire heat insulation cover prepared by this scheme can effectively block the diffusion of harmful gases during tire heating in production, and effectively prevent the carbonization dust of the material from entering the human body and affecting health. Detailed Implementation

[0029] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all 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.

[0030] It should be understood that the expression “one or more of…” individually includes each of the objects described after the expression, as well as various different combinations of two or more of the described objects, unless otherwise understood from the context and usage. The expression “and / or” combined with three or more described objects should be understood to have the same meaning, unless otherwise understood from the context.

[0031] It should be understood that the use of “including,” “having,” or “containing,” including its grammatical synonyms, should generally be understood as open-ended and non-restrictive, for example, not excluding other unstated elements or steps, unless otherwise specifically stated or understood from the context.

[0032] It should be understood that the order of the steps or the order in which certain actions are performed is not important as long as the invention remains operational. Furthermore, two or more steps or actions can be performed simultaneously.

[0033] Furthermore, the numerical ranges and parameters used to define the present invention are approximate values, and the relevant values ​​in the specific embodiments have been presented as precisely as possible. However, any value inevitably contains standard deviations due to individual test methods. Therefore, unless explicitly stated otherwise, it should be understood that all ranges, quantities, values, and percentages used in this disclosure are modified with the word "approximately". Here, "approximately" generally means that the actual value is within plus or minus 10%, 5%, 1%, or 0.5% of a specific value or range.

[0034] Example 1 A method for preparing an energy-saving and heat-insulating cover for a tire mold includes the following steps: Step 1: Mix 100 parts by mass of 4-hydroxyphthalic anhydride, 30 parts by mass of 3,4-diaminofuran and 240 parts by mass of dimethyl sulfoxide in a reaction vessel and react at 140°C for 10 hours. After the reaction is completed, cool the reaction solution to room temperature and pour it into deionized water to precipitate. After filtering to separate the solid, elute by silica gel column chromatography to obtain the diene. Step 2: According to the mass fraction, 100 parts of diene, 18 parts of paraformaldehyde, 1 part of zinc acetate and 240 parts of N,N-dimethylacetamide are mixed in a reaction vessel under nitrogen protection. The mixture is reacted at 120℃ for 10 hours. After the reaction is completed, the reaction solution is poured into deionized water to precipitate. After filtering to separate the solid, the obtained solid is washed with deionized water and dried to obtain diene phenolic resin. Step 3: According to the mass fraction, under nitrogen protection, 50 parts of 4-maleimide phenol, 8 parts of paraformaldehyde, 0.4 parts of zinc acetate, and 150 parts of N,N-dimethylacetamide are mixed in a reaction vessel and reacted at 100℃ for 8 hours. After the reaction is completed, the reaction solution is poured into deionized water to precipitate. After filtering to separate the solid, the obtained solid is washed with deionized water and dried to obtain dienophilic phenolic resin. Step 4: By mass, 100 parts of diene phenolic resin, 45 parts of diene-philic phenolic resin, and 300 parts of epichlorohydrin are mixed in a reaction vessel under nitrogen protection. The mixture is reacted at 80°C for 8 hours. During the reaction, a total of 16 parts of sodium hydroxide are added to the system in 8 batches, with each batch consisting of 2 parts. After the reaction is completed, deionized water is added to the system for washing. The organic phase is then separated, and excess epichlorohydrin is removed by rotary evaporation to obtain the heat-repaired phenolic epoxy resin. Step 5: By mass, mix 100 parts of heat-repairing phenolic epoxy resin, 30 parts of methacrylic acid, and 0.4 parts of N,N-dimethylbenzylamine and react at 100°C until the acid value of the system is 4.6 mg KOH / g. Then add 50 parts of styrene and 0.01 parts of methyl hydroquinone to the system to obtain heat-repairing phenolic epoxy vinyl resin. Step 6: By weight, mix 100 parts of heat-repairing phenolic epoxy vinyl resin, 1.0 part of methyl ethyl ketone peroxide, 0.5 parts of cobalt isooctanoate, 5 parts of fumed silica, 1.2 parts of silane coupling agent KH-570, and 0.5 parts of UV-326 to obtain a resin slurry for later use. Then, pour the resin slurry into a mold pre-coated with silicone release agent DOWSIL™20, and lay a layer of glass fiber mat. After molding to remove air bubbles, repeat the process of pouring resin, laying fiber, and molding to remove air bubbles until the designed thickness is achieved. A total of 25 parts of glass fiber mat are laid. Then, cure the composite material at room temperature for 24 hours, and then cure it at 100°C for 3 hours to obtain the tire mold energy-saving insulation cover.

[0035] Example 2 A method for preparing an energy-saving and heat-insulating cover for a tire mold includes the following steps: Step 1: According to the mass fraction, 110 parts of 4-hydroxyphthalic anhydride, 33 parts of 3,4-diaminofuran, and 270 parts of dimethyl sulfoxide were mixed in a reaction vessel and reacted at 150℃ for 8 hours. After the reaction was completed, the reaction solution was cooled to room temperature and poured into deionized water to precipitate. After filtering to separate the solid, the diene was obtained by silica gel column chromatography. Step 2: According to the mass fraction, 100 parts of diene, 21 parts of paraformaldehyde, 1.5 parts of zinc acetate and 270 parts of N,N-dimethylacetamide are mixed in a reaction vessel under nitrogen protection and reacted at 130℃ for 9 hours. After the reaction is completed, the reaction solution is poured into deionized water to precipitate. After filtering to separate the solid, the obtained solid is washed with deionized water and dried to obtain diene phenolic resin. Step 3: According to the mass fraction, 55 parts of 4-maleimide phenol, 11 parts of paraformaldehyde, 0.7 parts of zinc acetate, and 175 parts of N,N-dimethylacetamide were mixed in a reaction vessel under nitrogen protection and reacted at 110℃ for 6.5 h. After the reaction was completed, the reaction solution was poured into deionized water to precipitate. After filtering to separate the solid, the obtained solid was washed with deionized water and dried to obtain dienophilic phenolic resin. Step 4: By mass, 100 parts of diene phenolic resin, 50 parts of diene-philic phenolic resin, and 375 parts of epichlorohydrin are mixed in a reaction vessel under nitrogen protection. The mixture is reacted at 100°C for 6 hours. During the reaction, 18 parts of sodium hydroxide are added to the system in 6 batches, with each batch consisting of 3 parts. After the reaction is completed, deionized water is added to the system for washing. The organic phase is then separated, and excess epichlorohydrin is removed by rotary evaporation to obtain the heat-repaired phenolic epoxy resin. Step 5: By mass, mix 100 parts of heat-repairing phenolic epoxy resin, 32.5 parts of methacrylic acid, and 0.7 parts of triethylamine and react them at 110°C until the acid value of the system is 10.2 mg KOH / g. Then add 60 parts of styrene and 0.05 parts of hydroquinone to the system to obtain heat-repairing phenolic epoxy vinyl resin. Step 6: By weight, mix 100 parts of heat-repairing phenolic epoxy vinyl resin, 1.75 parts of methyl ethyl ketone peroxide, 1.25 parts of cobalt isooctanoate, 3 parts of fumed silica, 12 parts of aluminum hydroxide, 1.85 parts of silane coupling agent KH-570, 0.25 parts of UV-326, and 5 parts of flame retardant DOPO to obtain a resin slurry for later use. Then, pour the resin slurry into a mold pre-coated with silicone release agent DOWSIL™20, and lay a layer of glass fiber mat. After molding to remove air bubbles, repeat the process of pouring resin, laying fiber, and molding to remove air bubbles until the designed thickness is achieved. A total of 37.5 parts of glass fiber mat are laid. Then, cure the composite material at room temperature for 24 hours, and then at a temperature of 110°C for 2.5 hours to obtain the tire mold energy-saving insulation cover.

[0036] Energy-saving and heat-insulating cover for tire molds obtained by any of the above steps.

[0037] Example 3 A method for preparing an energy-saving and heat-insulating cover for a tire mold includes the following steps: Step 1: According to the mass fraction, 120 parts of 4-hydroxyphthalic anhydride, 36 parts of 3,4-diaminofuran, and 300 parts of dimethyl sulfoxide were mixed in a reaction vessel and reacted at 160℃ for 6 hours. After the reaction was completed, the reaction solution was cooled to room temperature and poured into deionized water to precipitate. After filtering to separate the solid, the diene was obtained by silica gel column chromatography. Step 2: According to the mass fraction, 100 parts of diene, 24 parts of paraformaldehyde, 2 parts of zinc acetate and 300 parts of N,N-dimethylacetamide are mixed in a reaction vessel under nitrogen protection. The mixture is reacted at 140℃ for 8 hours. After the reaction is completed, the reaction solution is poured into deionized water to precipitate. After filtering to separate the solid, the obtained solid is washed with deionized water and dried to obtain diene phenolic resin. Step 3: According to the mass fraction, under nitrogen protection, 60 parts of 4-maleimide phenol, 14 parts of paraformaldehyde, 1 part of zinc acetate, and 200 parts of N,N-dimethylacetamide are mixed in a reaction vessel and reacted at 120℃ for 5 hours. After the reaction is completed, the reaction solution is poured into deionized water to precipitate. After filtering to separate the solid, the obtained solid is washed with deionized water and dried to obtain dienophilic phenolic resin. Step 4: By mass, 100 parts of diene phenolic resin, 55 parts of diene-philic phenolic resin, and 450 parts of epichlorohydrin are mixed in a reaction vessel under nitrogen protection. The mixture is reacted at 120°C for 5 hours. During the reaction, 20 parts of sodium hydroxide are added to the system in 5 batches, with each batch consisting of 4 parts. After the reaction is completed, deionized water is added to the system for washing. The organic phase is then separated, and excess epichlorohydrin is removed by rotary evaporation to obtain the heat-repaired phenolic epoxy resin. Step 5: According to the mass fraction, mix 100 parts of heat-repairing phenolic epoxy resin, 35 parts of methacrylic acid, and 1 part of triethylenediamine and react them at a temperature of 120℃ until the acid value of the system is ≤5.2mgKOH / g. Then add 70 parts of styrene and 0.1 parts of methylhydroquinone to the system to obtain heat-repairing phenolic epoxy vinyl resin. Step 6: By weight, mix 100 parts of heat-repairing phenolic epoxy vinyl resin, 2.5 parts of methyl ethyl ketone peroxide, 2 parts of cobalt isooctanoate, 5 parts of fumed silica, 15 parts of calcium carbonate, 5 parts of talc, 2.5 parts of silane coupling agent KH-570, 0.5 parts of UV-327, and 9.5 parts of flame retardant DOPO to obtain a resin slurry for later use. Then, pour the resin slurry into a mold pre-coated with silicone release agent DOWSIL™20, and lay a layer of glass fiber mat. Then, press to remove air bubbles, repeat the process of pouring resin-laying fiber-pressing to remove air bubbles until the designed thickness is achieved, and lay a total of 50 parts of glass fiber mat. Then, cure the composite material at room temperature for 24 hours, and then cure at 120°C for 2 hours to obtain the tire mold energy-saving insulation cover.

[0038] Energy-saving and heat-insulating cover for tire molds obtained by any of the above steps.

[0039] A more detailed explanation will be provided based on the above embodiments 1-3: The process for this technical solution is typically carried out at 15℃-30℃. If the temperature is too low, the reaction will be too slow or the product will not cure; if the temperature is too high, the reaction will be too fast, resulting in insufficient processing time and potentially causing the product to crack. Post-curing temperature: After the product has cured at room temperature for 24 hours, it needs to be heated to 100℃-120℃ and cured under pressure.

[0040] Among them, fiberglass mat, as a reinforcing material, provides strength and rigidity for the energy-saving and heat-insulating cover of the finished tire mold, which is equivalent to "steel bars"; resin slurry binds the fiberglass mat together and transfers the load to ensure the product's corrosion resistance and aging resistance, which is equivalent to "concrete". Fiberglass mat can also be made of unidirectional cloth, multiaxial fabric, etc. In some embodiments, flame-retardant resin can be appropriately added to the above formulation, along with flame retardants such as antimony trioxide and aluminum hydroxide, to achieve a flame-retardant effect; In some embodiments, the use of surface glass fiber mat can be increased to form a resin-rich layer, which protects the glass fiber mat and can achieve a corrosion-resistant effect. In some embodiments, benzotriazole UV absorbers may be added to absorb UV rays and delay the occurrence of yellowing and powdering of the protective cover due to light aging during use. In this plan: Methyl ethyl ketone peroxide acts as an initiator, decomposing during the reaction to generate free radicals that initiate resin crosslinking and curing. As a further embodiment, methyl ethyl ketone peroxide can also be replaced by benzoyl peroxide. Cobalt isooctanoate, as a promoter, can lower the decomposition temperature of the initiator methyl ethyl ketone peroxide during the reaction, making the reaction more complete. It should be noted that the synergistic effect of the initiator and the accelerator forms a redox initiation system, which causes the peroxide to decompose rapidly into two free radicals at room temperature. The highly active free radicals react with the carbon-carbon double bonds in the phenolic epoxy vinyl resin and styrene monomer in a chain reaction, causing the linear long-chain molecules to cross-link with each other and form a three-dimensional network structure, thus changing from a liquid state to a solid state. Regarding the working principle of styrene monomer, on the one hand, it acts as a solvent to dilute the resin, reduce viscosity, and facilitate handling and impregnation of glass fiber mat. On the other hand, it functions as a crosslinking agent. The double bonds at both ends of its molecule can react with two or more unsaturated polyester molecular chains at the same time to form a "bridge" and complete a three-dimensional crosslinking network. Without styrene, the resin cannot be cured, the product strength is greatly reduced, and it is prone to brittleness and breakage. Calcium carbonate, talc, and aluminum hydroxide are used as fillers to effectively reduce production costs, increase the hardness of tire cover products, reduce curing shrinkage, and aluminum hydroxide also has flame retardant effects. The silicone-based mold release agent DOWSIL™ 20 forms an isolation layer on the mold surface, making the cured product easier to demold. As a further embodiment, wax, silicone oil, and PVA (polyvinyl alcohol) can also be used. In some embodiments, the process flow for the energy-saving insulation cover of the tire mold can specifically adopt the following steps: S1: Mold preparation: Clean the mold, apply release agent to ensure that the product can be demolded smoothly; S2: Gelcoat coating: Brush or spray a layer of gelcoat resin (pigment can be added) onto the mold, which, after curing, forms a smooth and weather-resistant outer surface of the product; S3: Resin paste: Mix heat-repairing phenolic epoxy vinyl resin, methyl ethyl ketone peroxide, cobalt isooctanoate, silica, silane coupling agent, and UV-326 in a uniform ratio to prepare an adhesive solution; then brush a layer of resin onto the gel coat layer. Lay a layer of cut fiberglass mat, and press it firmly with a brush or roller to fully saturate it with resin and remove air bubbles; repeat the steps of "brushing resin - laying fiber - pressing" until the designed thickness is achieved. S4: Curing: Let it stand at room temperature to cure naturally and then use heat to accelerate curing; S5: Demolding: After the resin has fully cured, remove the product from the mold; S6: Post-processing: Trim rough edges, and perform subsequent processing such as grinding, repair, and assembly on the product to finally obtain the tire mold energy-saving insulation cover.

[0041] The specific effects of the reaction process on the final product are as follows: Phenolic epoxy vinyl ester resin undergoes copolymerization and crosslinking with styrene monomers under free radical action, forming a three-dimensional network solid that determines the chemical resistance, heat resistance, and electrical insulation of the tire insulation cover, transferring and distributing the load to the fiberglass mat. The fiberglass mat, acting as a physical skeleton, is encapsulated and bonded by the resin, without participating in chemical reactions itself, providing reinforcement: offering the majority of strength and stiffness, and being the main load-bearing component. Styrene monomers act as crosslinking agents; their double bonds react with the double bonds on the resin molecular chain to form a crosslinked network, enabling the resin to cure and mold, and adjusting the operating viscosity for easy fiber impregnation. Initiators / accelerators are generated through redox reactions. Free radicals initiate and catalyze the polymerization and curing reaction of resins, determining the gel time and curing speed; they act as the "switch" that allows the reaction to proceed. Other fillers physically fill the spaces within the resin cross-linking network, reducing costs, increasing hardness and wear resistance, minimizing shrinkage and deformation, and improving flame retardancy. Coupling agents form chemical bonds between the glass fiber mat and the resin interface, achieving a strong bond; they significantly improve interlayer adhesion, thereby enhancing overall mechanical properties and environmental durability. The addition of UV absorbers can also transform the molecular structure, harmlessly releasing absorbed UV energy as heat; thus delaying yellowing, chalking, and strength loss caused by UV irradiation. In this solution, the prepared thermal insulation cover material exhibits excellent heat insulation performance and low thermal conductivity, effectively ensuring the thermal insulation requirements of the tire mold and further contributing to energy conservation. Furthermore, using phenolic epoxy vinyl resin as the base material, combined with fiberglass mat and other materials, ensures the strength of the thermal insulation cover material in product applications, significantly improving its impact resistance and high-temperature resistance. Simultaneously, the tire thermal insulation cover prepared by this solution can effectively block the diffusion of harmful gases generated during tire heating during production, effectively preventing the intrusion of carbonized dust into the human body and its impact on health.

[0042] Comparative Example 1 The difference between this comparative example and Example 1 is that, instead of preparing a heat-repairing phenolic epoxy resin, an equal mass of commercially available F44 phenolic epoxy resin was used.

[0043] Experimental Example 1 The performance of the energy-saving insulation covers for tire molds obtained in Examples 1-3 and Comparative Example 1 was tested. The heat distortion temperature of each component of the energy-saving insulation cover for tire molds was tested according to national standard GB / T 1634.1-2025 "Determination of Deformation Temperature of Plastics under Load", and the heat distortion temperature of each component of the energy-saving insulation cover for tire molds was tested according to national standard GB / T 10297-2015 "Determination of Thermal Conductivity of Non-metallic Solid Materials by Hot Wire Method". After heat aging at 180℃ for 1000 hours, the tests were repeated. The test results are shown in Table 1. Table 1 This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention, including the best mode, and also to enable any person skilled in the art to practice the present invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A method for preparing an energy-saving and heat-insulating cover for a tire mold, characterized in that, Includes the following steps: Step 1: The 4-hydroxyphthalic anhydride is reacted with 3,4-diaminofuran via an amidation reaction to obtain a diene; The second step involves reacting the diene with paraformaldehyde to obtain diene phenolic resin. The third step involves reacting 4-maleimide-phenol with paraformaldehyde to obtain dienophilic phenolic resin. Step 4: React diene phenolic resin, diene-philic phenolic resin, and epichlorohydrin to obtain heat-repairing phenolic epoxy resin; Step 5: After the heat-repairing phenolic epoxy resin, methacrylic acid, and catalyst undergo a ring-opening addition reaction, styrene and a polymerization inhibitor are added to the system to obtain the heat-repairing phenolic epoxy vinyl resin. Step 6: Mix the heat-repairing phenolic epoxy vinyl resin, initiator, accelerator, filler, silane coupling agent and functional additives to obtain a resin slurry for later use. Then, pour the resin slurry into a mold that has been pre-coated with a release agent, and lay glass fiber mat. After molding to remove air bubbles and curing, the tire mold energy-saving heat insulation cover is obtained.

2. The method for preparing an energy-saving and heat-insulating cover for a tire mold according to claim 1, characterized in that, The catalyst is an organic amine catalyst, including at least one of N,N-dimethylbenzylamine, triethylamine, and triethylenediamine.

3. The method for preparing an energy-saving and heat-insulating cover for a tire mold according to claim 1, characterized in that, The polymerization inhibitor is at least one of hydroquinone and methylhydroquinone.

4. The method for preparing an energy-saving and heat-insulating cover for a tire mold according to claim 1, characterized in that, The initiator is methyl ethyl ketone peroxide, and the accelerator is cobalt isooctanoate.

5. The method for preparing an energy-saving and heat-insulating cover for a tire mold according to claim 1, characterized in that, The filler is at least one of fumed silica, calcium carbonate, talc, and aluminum hydroxide.

6. The method for preparing an energy-saving and heat-insulating cover for a tire mold according to claim 1, characterized in that, The silane coupling agent is KH-570, and the mold release agent is an organosilicon mold release agent.

7. The method for preparing an energy-saving and heat-insulating cover for a tire mold according to claim 1, characterized in that, The functional additive is at least one of ultraviolet absorbers and flame retardants.

8. The method for preparing an energy-saving and heat-insulating cover for a tire mold according to claim 1, characterized in that, The ring-opening addition reaction is carried out at a temperature of 100–120°C until the acid value of the system is ≤12 mg KOH / g.

9. The method for preparing an energy-saving and heat-insulating cover for a tire mold according to claim 1, characterized in that, The curing conditions are as follows: curing at room temperature for 24 hours, followed by curing at a temperature of 100-120°C for 2-3 hours.

10. The tire mold energy-saving heat insulation cover obtained by the preparation method of claim 1.

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