Binder and its preparation method and application

Abstract

The present application provides a bonding material and a preparation method and application thereof, which relates to the field of material technology. The bonding material comprises a first component and a second component; the first component comprises, by weight: 30-50 parts of epoxy resin; 0.1-0.5 parts of sulfide; 0.1-1 parts of accelerator; 0-0.1 parts of catalyst; 3-5 parts of toughening agent; 3-5 parts of flame retardant; 5-10 parts of first solvent; the second component comprises, by weight: 30-40 parts of isocyanate; 1-10 parts of polyol; 5-10 parts of second solvent. Thus, the bonding material has good adhesion, can be quickly bonded at a lower temperature, and has better performance.

Description

Technical Field

[0001] The present application relates to the field of material technology, and in particular to an adhesive and a preparation method and application thereof. Background Art

[0002] With the development of technology, non-pneumatic tires, as tires for the new generation of electric vehicles, have been increasingly studied and applied. Non-pneumatic tires usually consist of three parts: tread, spokes, and hubs. The way these three parts fit together will affect the performance of the entire non-pneumatic tire.

[0003] Usually, a bonding layer is used to bond the spokes to the tread. Most of the rubbers that make up the tread are non-polar materials such as natural rubber, styrene-butadiene rubber, butadiene rubber and isoprene rubber, and the adhesive in the bonding layer is currently often polyurethane adhesives. However, if the spokes and the tread are bonded only with polyurethane adhesives containing isocyanate groups, the bonding strength is low and cannot meet the bonding strength requirements of the bonding layer of non-pneumatic tires during high-speed operation, sudden stop or sudden acceleration.

[0004] Therefore, it is urgent to develop a novel bonding layer for non-pneumatic tires to solve the above problems. Summary of the invention

[0005] The embodiments of the present application provide an adhesive and a preparation method and application thereof, thereby solving the problem that the traditional adhesive layer cannot achieve good bonding strength, resulting in the inability to meet the bonding strength requirements of the adhesive layer during high-speed operation, sudden stop or sudden acceleration of the non-pneumatic tire.

[0006] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0007] In one aspect, a bonding material is provided, the bonding material comprising a first component and a second component;

[0008] The first component comprises by weight:

[0009] Epoxy resin, 30-50 parts;

[0010] Sulfide, 0.1-0.5 parts;

[0011] Accelerator, 0.1-1 part;

[0012] Catalyst, 0-0.1 parts;

[0013] Toughener, 3-5 parts;

[0014] Flame retardant, 3-5 parts;

[0015] The first solvent, 5-10 parts;

[0016] The second component includes, by weight parts:

[0017] Isocyanate, 30 - 40 parts;

[0018] Polyol, 1 - 10 parts;

[0019] Second solvent, 5 - 10 parts.

[0020] Furthermore, the ratio range of the first component to the second component includes 100:10 - 100:15.

[0021] Furthermore, the sulfide includes mercaptan;

[0022] The accelerator includes at least one of tertiary amine accelerators and pyridine accelerators;

[0023] The catalyst includes metal catalysts;

[0024] The toughening agent includes rubber toughening agents;

[0025] The flame retardant includes organophosphorus flame retardants;

[0026] The first solvent includes ketone solvents.

[0027] Furthermore, the polyol includes alcohols containing multiple hydroxyl groups;

[0028] The second solvent includes ketone solvents.

[0029] Furthermore, the peel strength range of the adhesive is 18 - 32 KN / m;

[0030] and / or,

[0031] The bonding temperature range of the adhesive is 1 - 25 °C;

[0032] and / or,

[0033] The bonding time range of the adhesive is 10 - 30 min.

[0034] On the other hand, a bonding layer is provided, including the above-mentioned adhesive.

[0035] On another hand, a non-pneumatic tire is provided, including a spoke, a tread, and the above-mentioned bonding layer, and the bonding layer is used to bond the spoke and the tread.

[0036] On yet another hand, a preparation method of the above-mentioned adhesive is provided, including the following steps:

[0037] Obtain the first component;

[0038] Obtain the second component;

[0039] Mix the first component and the second component in a ratio of 100:10 - 100:15 to obtain the binder.

[0040] Further, the obtaining of the first component includes:

[0041] Dehydrate the epoxy resin at 110 - 130 °C for 110 - 130 min to obtain dehydrated epoxy resin;

[0042] After cooling the dehydrated epoxy resin to 50 - 70 °C, add the sulfide, the toughening agent, the flame retardant and the first solvent. After mixing evenly, add the accelerator and the catalyst. After reacting for a period of time, obtain the first component.

[0043] Further, the obtaining of the second component includes:

[0044] Dehydrate the polyol at 110 - 130 °C for 11 - 13 min to obtain dehydrated polyol;

[0045] After cooling the dehydrated polyol to 30 - 50 °C, add the second solvent and disperse evenly. Then add the isocyanate to the dehydrated polyol in multiple portions. After reacting for a period of time and heating to 75 - 80 °C, and reacting for another period of time, then cool to 25 - 30 °C to obtain the second component.

[0046] The embodiments of the present application provide a binder, its preparation method and application. Respectively, an epoxy ring-opening reaction occurs between the epoxy group in the epoxy resin and the thiol group in the sulfide to generate a molecule containing a hydroxyl group, and a prepolymer of polyol-modified isocyanate obtained by the reaction of polyol and isocyanate group. Then, the molecule containing a hydroxyl group can react with the prepolymer of polyol-modified isocyanate to obtain the binder of the embodiments of the present application. This binder has good adhesiveness and can be quickly adhered at a lower temperature, with better performance.

[0047] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically given below. Description of the Drawings

[0048] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0049] Figure 1 Structural schematic diagram of a non-pneumatic tire provided by an embodiment of the present application;

[0050] Figure 2 Schematic diagram of the bonding between the bonding layer and the tread provided by an embodiment of the present application;

[0051] Figure 3 Process flow chart of the preparation of a binder provided by an embodiment of the present application;

[0052] Figure 4 Another process flow chart of the preparation of a binder provided by an embodiment of the present application;

[0053] Figure 5 Yet another process flow chart of the preparation of a binder provided by an embodiment of the present application;

[0054] Figure 6 Still another process flow chart of the preparation of a binder provided by an embodiment of the present application. Detailed implementation manners

[0055] In order to make the technical problems to be solved, technical solutions and beneficial effects of the present application clearer and more understandable, the following further details the present application in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0056] In the present application, the term "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, or B exists alone. Where A and B may be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0057] In the present application, "at least one" means one or more, and "a plurality" means two or more. "At least one of the following items" or its similar expressions refer to any combination of these items, including any combination of single item(s) or plural item(s). For example, "at least one of a, b or c", or, "at least one of a, b and c" can both represent: a, b, c, a - b (i.e., a and b), a - c, b - c or a - b - c, where a, b, c can be single or multiple respectively.

[0058] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution, some or all of the steps can be executed in parallel or sequentially, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0059] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0060] The weight of the relevant components mentioned in the embodiment description of the present application can not only refer to the specific content of each component, but also represent the proportional relationship between the weights of the components. Therefore, as long as the content of the relevant components is proportionally enlarged or reduced according to the embodiment description of the present application, it is within the scope disclosed in the embodiment description of the present application. Specifically, the mass described in the embodiment description of the present application can be a mass unit known in the chemical industry such as μg, mg, g, kg, etc.

[0061] The terms "first" and "second" are used only for descriptive purposes to distinguish objects such as substances from each other, and should not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. For example, without departing from the scope of the embodiments of the present application, the first XX may also be referred to as the second XX, and similarly, the second XX may also be referred to as the first XX. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0062] In a first aspect, an embodiment of the present application provides an adhesive, which includes a first component and a second component.

[0063] The first component includes, by weight: 30-50 parts of epoxy resin; 0.1-0.5 parts of sulfide; 0.1-1 parts of accelerator; 0-0.1 parts of catalyst; 3-5 parts of toughening agent; 3-5 parts of flame retardant; and 5-10 parts of the first solvent.

[0064] The second component comprises, by weight: 30-40 parts of isocyanate; 1-10 parts of polyol; and 5-10 parts of a second solvent.

[0065] In practical applications, when the ratio of the first component to the second component is too high or too low, the strength of the binder is low. Therefore, the ratio range of the first component to the second component can be set to 100:10 - 100:15, which can make the strength of the binder better. Exemplarily, the ratio of the first component to the second component can be 100:10, 100:11, 100:12, 100:13, 100:14 or 100:15, etc.

[0066] It should be understood that the molecular chain of the above epoxy resin has epoxy groups

[0067] In applications, the above sulfide can be mercaptan, etc. Among them, the molecular chain of mercaptan has a mercapto (-SH) functional group, that is, a mercapto group functional group. Here, mercaptan can be used as a curing agent.

[0068] The above accelerator can be at least one of tertiary amine accelerators and pyridine accelerators, etc. Among them, tertiary amine accelerators can include dimethylethanolamine, tetramethylethylenediamine, benzyldimethylbenzene, N-methyl-N-hydroxyethyl-p-toluidine, triethanolamine, tripropylamine, etc.

[0069] It should be noted that the principle of pyridine accelerators is similar to that of tertiary amine accelerators, so it will not be elaborated here.

[0070] Since the reaction activity of mercaptan is very low, if an accelerator is present, mercaptan ions can be formed, accelerating the reaction between the mercapto group and the epoxy group. And based on the nucleophilic reaction mechanism, the epoxy group in the epoxy resin and the mercapto group functional group in mercaptan can undergo a ring-opening reaction under the action of the accelerator to generate a molecule containing a hydroxyl group, and the reaction is much faster and can be carried out at low temperatures.

[0071] The following gives a reaction formula of epoxy resin and mercaptan:

[0072]

[0073] On the above basis, high molecular weight modified epoxy resin can be obtained by controlling the amount of mercaptan. It should be noted that, first, the amount of mercaptan cannot be too much to prevent curing. Second, the molecular weight of the modified epoxy resin is about twice or more than the molecular weight of the epoxy resin purchased on the market.

[0074] In applications, the above catalyst can be a metal catalyst. For example, metal acetylacetonate, and the metal ions in the metal acetylacetonate can include iron ions (Fe 3+ ), cobalt ions (Co 3+ ), nickel ions (Ni 2+) etc.; alternatively, the above catalyst can also be trioleate of tris(dimethylaminomethyl)phenol etc. The catalyst here can promote the reaction between the epoxy group and the thiol group in the first component to generate a hydroxyl group, and the overall reaction rate can be controlled by controlling the amount of the catalyst.

[0075] The above toughener can be a rubber toughener, for example, nitrile rubber etc. Through the dissolution of the first solvent, the toughener can be well dissolved in the first component, and the toughener can be better dispersed in the epoxy resin during the gelation process, improving the toughness of the epoxy resin.

[0076] The above flame retardant can be an organophosphorus flame retardant, for example, triphosphate etc. The organophosphorus flame retardant here contains a phosphate group, can be finely dispersed in the first component system, and provides good flame retardant performance.

[0077] The above first solvent can be a ketone solvent, for example, methyl ethyl ketone etc. Adding a ketone solvent here is beneficial to the dispersion of other components in the first component, greatly reducing the viscosity of the mixed solution. In addition, it can also increase the uniformity when mixing with the second component later, and effectively improve the dispersion of the toughener and the flame retardant.

[0078] Exemplarily, the epoxy resin can be 30 parts, 35 parts, 40 parts, 45 parts, 48 parts or 50 parts etc. by weight; the sulfide can be 0.1 part, 0.2 part, 0.3 part, 0.4 part or 0.5 part etc. by weight; the accelerator can be 0.1 part, 0.2 part, 0.4 part, 0.6 part, 0.8 part or 1 part etc. by weight; the catalyst can be 0 part, 0.02 part, 0.04 part, 0.06 part, 0.08 part or 0.1 part etc. by weight; the toughener can be 3 parts, 3.5 parts, 4 parts, 4.5 parts, 4.8 parts or 5 parts etc. by weight; the flame retardant can be 3 parts, 3.5 parts, 4 parts, 4.5 parts, 4.8 parts or 5 parts etc. by weight; the first solvent can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts etc. by weight.

[0079] In practical applications, the above polyol can be an alcohol containing two or more hydroxyl groups, for example, polyester polyol, polymer polyol and polymeric polyol etc., and specifically can include ethylene glycol, propylene glycol, butanediol, glycerol, pentaerythritol etc. The polyol here has a toughening effect in the molecule, can adjust the toughness. At the same time, the polyol can react with isocyanate to adjust the reaction activity of the isocyanate group. In addition, after modification of the polyol, a mixture can be obtained, and the mixture includes substances with isocyanate groups at the ends of long molecular chains and contains some unreacted isocyanates. Thus, the strength of the adhesive can be adjusted.

[0080] The above-mentioned second solvent may include ketone solvents, for example, methyl ethyl ketone, etc. Adding ketone solvents here is beneficial to the dispersion of other components in the second component, greatly reduces the viscosity of the mixture, and can also increase the uniformity when mixing with the first component subsequently. At the same time, it effectively improves the dispersion of the toughening agent and the flame retardant.

[0081] Exemplarily, the isocyanate may be 30 parts, 32 parts, 34 parts, 36 parts, 38 parts or 40 parts, etc. by weight; the polyol may be 1 part, 2 parts, 4 parts, 6 parts, 8 parts or 10 parts, etc. by weight; the second solvent may be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts, etc. by weight.

[0082] Thus, the second component is a prepolymer of polyol-modified isocyanate obtained by the reaction of the isocyanate group with the hydroxyl group in the polyol. This prepolymer is a long-chain molecule capped with isocyanate groups, and its structure is an alternating structure compound of polyol and isocyanate. This prepolymer can provide the toughness for forming the overall structure, reduce the activity of the isocyanate, improve the storage stability, and in addition, can also increase the working time when the first component and the second component are mixed.

[0083] Then, in the embodiments of the present application, an epoxy ring-opening reaction can occur between the epoxy group in the epoxy resin and the thiol group in the sulfide to generate a modified epoxy resin containing hydroxyl groups, and a prepolymer of polyol-modified isocyanate obtained by the reaction of the polyol with the isocyanate group. Then, the modified epoxy resin containing hydroxyl groups can react with the prepolymer of polyol-modified isocyanate to obtain the adhesive of the embodiments of the present application.

[0084] In summary, the peel strength range of the adhesive of the embodiments of the present application can be 18 - 32 KN / m, which reflects the broadness and limit of the adhesion strength, that is, it indicates that the adhesive has good adhesion strength. Exemplarily, the peel strength of the adhesive can be 18 KN / m, 20 KN / m, 24 KN / m, 27 KN / m, 30 KN / m or 32 KN / m, etc.

[0085] The bonding temperature range of the adhesive of the embodiments of the present application can be 1 - 25 °C, indicating that the adhesive can be bonded at a relatively low temperature. Exemplarily, the bonding temperature of the adhesive can be 1 °C, 5 °C, 10 °C, 15 °C, 18 °C or 25 °C, etc.

[0086] The bonding time range of the adhesive of the embodiments of the present application can be 10 - 30 min, indicating that the adhesive can be quickly bonded in a short time. Exemplarily, the bonding time of the adhesive can be 10 min, 15 min, 20 min, 25 min, 28 min or 30 min, etc.

[0087] An embodiment of the present application provides an adhesive, which has good adhesiveness and can be quickly adhered at a relatively low temperature, with excellent performance.

[0088] In a second aspect, an embodiment of the present application provides an adhesive layer, including the above-mentioned adhesive.

[0089] An embodiment of the present application provides an adhesive layer, which has good adhesiveness and can be quickly adhered at a relatively low temperature, with excellent performance.

[0090] In a third aspect, an embodiment of the present application provides a non-pneumatic tire, as Figure 1 shown, the non-pneumatic tire includes a wheel spoke, a tread, and the above-mentioned adhesive layer. The wheel spoke includes a plurality of spokes, and the adhesive layer is disposed between the spokes and the tread and is used to bond the spokes and the tread.

[0091] In addition, as Figure 1 shown, the non-pneumatic tire may further include a hub, and the hub is disposed on a side of the spoke away from the adhesive layer and is connected to the side of the spoke away from the adhesive layer.

[0092] In application, the material of the above-mentioned tread may include a rubber composition, and the raw rubber of the rubber composition may be selected from one of the group consisting of natural rubber, synthetic rubber, and combinations thereof.

[0093] Among them, the natural rubber may be conventional natural rubber or modified natural rubber. Any natural rubber can be used as the conventional natural rubber as long as it is known as natural rubber, and the place of origin and the like are not restricted. For example, the natural rubber may contain cis-1,4-polyisoprene as the main agent and may also contain trans-1,4-polyisoprene according to the required properties. Therefore, the above-mentioned natural rubber may include not only natural rubber containing cis-1,4-polyisoprene as the main agent but also natural rubber containing trans-1,4-isoprene as the main agent.

[0094] Synthetic natural rubber refers to natural rubber obtained by modifying or purifying the above-mentioned conventional natural rubber. For example, epoxidized natural rubber (ENR), deproteinized natural rubber (DPNR), and hydrogenated natural rubber, etc.

[0095] Figure 2 The structural schematic diagram after the adhesive layer and the tread of the embodiment of the present application are combined is shown.

[0096] In Figure 2Among them, the solid line is epoxy resin, and the spherical balls are cross-linking point structures, which are mainly groups formed by the reaction of hydroxyl groups generated after the ring-opening reaction of epoxy groups in epoxy resin with mercapto functional groups in mercaptan and isocyanate, thus forming an overall network structure. Therefore, the structure containing hydroxyl groups generated after the ring-opening reaction of epoxy groups in epoxy resin with mercapto functional groups in mercaptan is bonded (or connected) through the groups generated by the reaction of isocyanate with hydroxyl groups to form an adhesive; the dashed line is a rubber molecule, and the rubber molecule can be adhered by this adhesive.

[0097] An embodiment of the present application provides a non-pneumatic tire, and the spoke and the tread in the non-pneumatic tire can be quickly and effectively adhered through the adhesive layer provided by the embodiment of the present application.

[0098] In the fourth aspect, an embodiment of the present application provides a preparation method of the above-mentioned adhesive.

[0099] As Figure 3 shown, the preparation method of the adhesive includes the following steps:

[0100] S1. Obtain the first component.

[0101] S2. Obtain the second component.

[0102] S3. Mix the first component and the second component in a ratio of 100:10 - 100:15 to obtain an adhesive.

[0103] Exemplarily, the ratio of the first component to the second component can be 100:10, 100:11, 100:12, 100:13, 100:14 or 100:15, etc.

[0104] Further, as Figure 4 shown, the above step S1. Obtain the first component includes:

[0105] S11. Dehydrate epoxy resin at 110 - 130 °C and 60 - 120 r / min for 110 - 130 min to obtain dehydrated epoxy resin.

[0106] Since the reaction rate of water with isocyanate is very fast, in order to avoid consuming the groups participating in the reaction and ensure the strength of the final adhesive layer, water needs to be removed in advance. However, since the water content of sulfides, toughening agents, and flame retardants is generally below 0.12% and will not have an impact, epoxy resin is dehydrated in advance, and high-temperature dehydration is to prevent solvent volatilization.

[0107] Exemplarily, the dehydration temperature of epoxy resin can be 110 °C, 115 °C, 120 °C, 125 °C or 130 °C, etc.

[0108] Exemplarily, the dehydration time of the epoxy resin can be 110 min, 115 min, 120 min, 125 min, 130 min, etc.

[0109] Exemplarily, the dehydration rotation speed of the epoxy resin can be 60 r / min, 70 r / min, 80 r / min, 90 r / min, 110 r / min, 120 r / min, etc.

[0110] S12. After cooling the dehydrated epoxy resin to 50 - 70 °C, add sulfide, toughening agent, flame retardant, and the first solvent. After mixing evenly, add accelerator and catalyst, and react for 110 - 130 min to obtain the first component.

[0111] The purpose of cooling the dehydrated epoxy resin to 50 - 70 °C is to control the reaction rate, avoid explosive polymerization, and avoid a large amount of solvent volatilization at high temperature.

[0112] Exemplarily, the temperature for cooling the dehydrated epoxy resin can be 50 °C, 55 °C, 60 °C, 65 °C, 68 °C, 70 °C, etc.

[0113] Exemplarily, the reaction time can be 110 min, 115 min, 120 min, 125 min, 130 min, etc.

[0114] Further, as Figure 5 shown, the above step S2, obtaining the second component, includes:

[0115] S21. Dehydrate the polyol at 110 - 130 °C and 80 - 100 r / min for 11 - 13 min to obtain dehydrated polyol.

[0116] Since the reaction rate of water and isocyanate is very fast, in order to avoid consuming the reactive groups and ensure the strength of the final bonding layer, the polyol is dehydrated in advance, and high-temperature dehydration is to prevent solvent volatilization.

[0117] Exemplarily, the dehydration temperature of the polyol can be 110 °C, 115 °C, 120 °C, 125 °C, 130 °C, etc.

[0118] Exemplarily, the dehydration time of the polyol can be 11 min, 12 min, 13 min, etc.

[0119] Exemplarily, the dehydration rotation speed of the polyol can be 80 r / min, 85 r / min, 90 r / min, 95 r / min, 98 r / min, 100 r / min, etc.

[0120] S22. Cool the dehydrated polyol to 30 - 50°C. After adding the second solvent and dispersing evenly, add the isocyanate to the dehydrated polyol in several portions. React for a period of time and then heat up to 75 - 80°C. After reacting for another period of time, cool down to 25 - 30°C to obtain the second component.

[0121] In the application, the number of times of adding the isocyanate to the dehydrated polyol in several portions can be two, three, four, etc. Since adding the isocyanate at one time is prone to explosive polymerization and forms more low - molecular - weight substances. Therefore, adding the isocyanate in several portions can control the deviation of the formed macromolecules in terms of molecular weight distribution to be smaller.

[0122] Exemplarily, the temperature for cooling the dehydrated polyol can be 30°C, 35°C, 40°C, 45°C, 48°C or 50°C, etc.

[0123] Exemplarily, when adding the isocyanate to the dehydrated polyol in several portions, reacting for a period of time and then heating up, the temperature can be 75°C, 76°C, 77°C, 78°C, 79°C or 80°C, etc.

[0124] Exemplarily, when adding the isocyanate to the dehydrated polyol in several portions, reacting for a period of time and then heating up to 75 - 80°C, and after reacting for another period of time, the temperature for cooling down can be 25°C, 26°C, 27°C, 28°C, 29°C or 30°C, etc.

[0125] Furthermore, as Figure 6 shown, the above - mentioned step S22, cooling the dehydrated polyol to 30 - 50°C, then adding the isocyanate to the dehydrated polyol in several portions, reacting for a period of time and heating up to 75 - 80°C, and after reacting for another period of time, cooling down to 25 - 30°C to obtain the second component includes:

[0126] S221. Cool the dehydrated polyol to 30 - 50°C. After adding the second solvent and dispersing evenly, add the isocyanate to the dehydrated polyol in three portions. React for 30 min each time for the first two times. After the third addition, react for 30 min and then heat up to 75°C - 80°C and react for 60 min, then cool down to 25 - 30°C to obtain the second component.

[0127] The embodiment of the present application provides a preparation method of an adhesive. This preparation method first makes the epoxy group in the epoxy resin undergo a ring - opening reaction with the thiol group in the sulfide to generate a molecule containing a hydroxyl group, and makes the polyol react with the isocyanate group to generate a prepolymer of polyol - modified isocyanate. Finally, the molecule containing a hydroxyl group reacts with the prepolymer of polyol - modified isocyanate to generate an adhesive with good adhesion and can be quickly adhered at a lower temperature. In addition, this preparation method is simple and easy to implement, and has a lower cost.

[0128] The following provides a specific preparation process for a non-pneumatic tire:

[0129] (1). Dehydrate epoxy resin at 120 °C for 120 min at 60 - 120 r / min to obtain dehydrated epoxy resin.

[0130] (2). Cool the dehydrated epoxy resin to 50 - 70 °C, add sulfide, toughening agent, flame retardant and a first solvent for mixing and dispersion. After the mixed liquid is non-layered and homogeneous, add a certain amount of accelerator and catalyst, and react at this temperature for 120 min to obtain a first component.

[0131] (3). Dehydrate polyol at 120 °C for 12 min at 80 - 100 r / min to obtain dehydrated polyol.

[0132] (4). Cool the dehydrated polyol to 30 - 50 °C, add a second solvent and disperse evenly. Then add the metered isocyanate into the polyol in three equal portions. React for 30 min each time for the first two times. After the third addition, react for 30 min and then raise the temperature to 75 - 80 °C and react for 60 min. Then cool to 25 - 30 °C to obtain a second component.

[0133] (5). Mix the first component and the second component in a ratio of 100:10 - 100:15 with a stirring device at 60 - 120 r / min for 2 - 5 min to obtain an adhesive.

[0134] (6). Blow the surfaces of the various components of the non-pneumatic tire until there is no obvious floating dust on the surfaces.

[0135] (6). Use a coating device to coat or spray the adhesive onto the positions of the various components that need to be bonded.

[0136] (8). Assemble the various components into one body and place them under a pressure of 0.5 - 3 MPa for more than 3 h.

[0137] It should be noted that the descriptions of epoxy resin, sulfide, toughening agent, flame retardant, first solvent, polyol, isocyanate and second solvent in the embodiments of this application can refer to the above embodiments and will not be elaborated here.

[0138] The following uses multiple specific examples to illustrate the adhesives of the embodiments and comparative examples of this application, their preparation methods and applications.

[0139] Example 1

[0140] (1). Dehydrate epoxy resin at 120 °C for 120 min at 60 r / min to obtain dehydrated epoxy resin.

[0141] (2) Cool the dehydrated epoxy resin to 50°C, add mercaptan, nitrile rubber, triphosphate ester and methyl ethyl ketone for mixing and dispersion. After the mixed solution has no stratification and is homogeneous, add a certain amount of N-methyl-N-hydroxyethyl-p-toluidine and iron acetylacetonate, and react at this temperature for 120 min to obtain the first component.

[0142] (3) Dehydrate the polyol at 120°C and 80 r / min for 12 min to obtain dehydrated polyol.

[0143] (4) Cool the dehydrated polyol to 30°C, and add the metered isocyanate into the polyol in two equal portions. React for 30 min each time for the first time. After the second addition, react for 30 min, then raise the temperature to 75°C and react for 60 min, and then cool to 25°C to obtain the second component.

[0144] (5) Mix the first component and the second component in a ratio of 100:10 with a stirring device at 60 r / min for 2 min to obtain the adhesive.

[0145] Example 2

[0146] (1) Dehydrate the epoxy resin at 120°C and 100 r / min for 120 min to obtain dehydrated epoxy resin.

[0147] (2) Cool the dehydrated epoxy resin to 60°C, add mercaptan, nitrile rubber, triphosphate ester and methyl ethyl ketone for mixing and dispersion. After the mixed solution has no stratification and is homogeneous, add a certain amount of triethanolamine and cobalt acetylacetonate, and react at this temperature for 120 min to obtain the first component.

[0148] (3) Dehydrate the polyol at 120°C and 90 r / min for 12 min to obtain dehydrated polyol.

[0149] (4) Cool the dehydrated polyol to 40°C, and add the metered isocyanate into the polyol in three equal portions. React for 30 min each time for the first two times. After the third addition, react for 30 min, then raise the temperature to 78°C and react for 60 min, and then cool to 28°C to obtain the second component.

[0150] (5) Mix the first component and the second component in a ratio of 100:13 with a stirring device at 100 r / min for 4 min to obtain the adhesive.

[0151] Example 3

[0152] (1) Dehydrate the epoxy resin at 120°C and 120 r / min for 120 min to obtain dehydrated epoxy resin.

[0153] (2) Cool down the dehydrated epoxy resin to 70°C, add mercaptan, nitrile rubber, triphosphate ester and methyl ethyl ketone, and mix and disperse them. After the mixed solution is homogeneous without stratification, add a certain amount of tripropylamine and nickel acetylacetonate, and react at this temperature for 120 minutes to obtain the first component.

[0154] (3) Dehydrate the polyol at 120°C and 100 r / min for 12 minutes to obtain dehydrated polyol.

[0155] (4) Cool down the dehydrated polyol to 50°C, and add the metered isocyanate into the polyol in 4 equal portions. React for 30 minutes each for the first two times, and after adding the last two portions, react for 30 minutes and then raise the temperature to 80°C and react for 60 minutes, and then cool down to 30°C to obtain the second component.

[0156] (5) Mix the first component and the second component in a ratio of 100:15 with a stirring device at 120 r / min for 5 minutes to obtain the adhesive.

[0157] Comparative Example 1

[0158] Use commercially available polyurethane as the adhesive.

[0159] Next, the adhesives obtained in Examples 1-3 and Comparative Example 1 were respectively tested for peel strength, and the results are shown in Table 1 below.

[0160] Among them, according to the GB / T 1524-2014 standard, the peel strength test was carried out on a tensile testing machine at a rate of 100 mm / min.

[0161] Table 1

[0162]

[0163] It can be obtained from Table 1 that, compared with Comparative Example 1, the peel strengths of Examples 1-3 are greater at 0.5 MPa, 1.5 MPa and 3.0 MPa, and the adhesive strength of the adhesives prepared in Examples 1-3 is very good.

[0164] This application only introduces the content related to the inventive points. For the remaining structures, reference can be made to the related technologies and will not be elaborated here.

[0165] As used herein, "Example" means that the specific features, structures, or characteristics described in connection with the examples are included in at least one example of the present application.

[0166] In the specification provided herein, a large number of specific details are set forth. However, it will be understood that embodiments of the present application may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0167] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A bonded article, characterized in that: Applicable to a non-pneumatic tire, the non-pneumatic tire further comprises a spoke and a tread, the adhesive is used to bond the spoke to the tread, and the adhesive comprises a first component and a second component; The first component comprises by weight: Epoxy resin, 30-50 parts; Sulfide, 0.1-0.5 parts; the sulfide is mercaptan; Accelerator, 0.1-1 part; Catalyst, 0-0.1 part; Toughener, 3-5 parts; Flame retardant, 3-5 parts; The first solvent, 5-10 parts; The first component is obtained by the following steps: Dehydrating the epoxy resin at 110-130° C. for 110-130 min to obtain a dehydrated epoxy resin; After cooling the dehydrated epoxy resin to 50-70° C., adding the mercaptan, the toughening agent, the flame retardant and the first solvent, mixing them evenly, adding the accelerator and the catalyst, and reacting for a period of time to obtain the first component; The second component comprises by weight: Isocyanate, 30-40 parts; Polyol, 1-10 parts; The second solvent, 5-10 parts; The second component is obtained by the following steps: Dehydrating the polyol at 110-130° C. for 11-13 min to obtain a dehydrated polyol; The dehydrated polyol is cooled to 30-50°C, and the second solvent is added to disperse the dehydrated polyol evenly. The isocyanate is then added to the dehydrated polyol in multiple times, and the reaction is continued for a period of time and the temperature is raised to 75-80°C. After further reaction for a period of time, the temperature is cooled to 25-30°C to obtain the second component.

2. The adhesive according to claim 1, characterized in that The ratio of the first component to the second component ranges from 100:10 to 100:

15.

3. The adhesive according to claim 2, characterized in that The accelerator includes at least one of a tertiary amine accelerator and a pyridine accelerator; The catalyst includes a metal catalyst; The toughening agent includes a rubber toughening agent; The flame retardant includes an organic phosphorus flame retardant; The first solvent includes a ketone solvent.

4. The adhesive according to claim 2, characterized in that: The polyols include alcohols containing multiple hydroxyl groups; The second solvent includes a ketone solvent.

5. The bonded article according to any one of claims 1 to 4, characterized in that The peel strength of the adhesive is in the range of 18-32 KN / m; and / or, The bonding temperature range of the adhesive is 1-25°C; and / or, The bonding time of the adhesive is in the range of 10-30 minutes.

6. A bonding layer, characterized in that: The invention comprises the adhesive as claimed in any one of claims 1 to 5.

7. A non-pneumatic tire, characterized in that: The invention comprises a wheel spoke, a tread and the bonding layer as claimed in claim 6, wherein the bonding layer is used for bonding the wheel spoke to the tread.

8. A method for preparing a bonded article according to any one of claims 1 to 5, characterized in that: The steps include: obtaining the first component; obtaining the second component; The first component and the second component are mixed in a ratio of 100:10-100:15 to obtain the adhesive.

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