Preparation method of xanthoceras sorbifolia bunge oil-based adhesive for table tennis bats

Abstract

The invention discloses a preparation method of a xanthoceras sorbifolia bunge oil-based adhesive for table tennis bats, and belongs to the technical field of adhesives. The preparation method provided by the invention comprises the following steps: mixing xanthoceras sorbifolia bunge oil dimethacrylate and acrylated epoxy xanthoceras sorbifolia bunge oil, adding 2-isocyanate ethyl methacrylate and an initiator, and stirring to obtain the xanthoceras sorbifolia bunge oil-based adhesive for table tennis bats. The xanthoceras sorbifolia bunge oil dimethacrylate is used as an active diluent of acrylated epoxidized xanthoceras sorbifolia bunge oil to prepare a plant oil-based thermosetting adhesive, then a bifunctional monomer isocyanatoethyl methacrylate is selected to participate in a reaction, IEM can be crosslinked with the xanthoceras sorbifolia bunge oil dimethacrylate and the acrylated epoxidized xanthoceras sorbifolia bunge oil, and the prepared plant oil-based thermosetting adhesive has the advantages of high adhesion, high adhesion, high adhesion and the like. And the polymer can be coupled with-OH groups on the wood so as to improve the interface bonding between the base material and the adhesive, so that the interface bonding force between the wood and the adhesive is effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of adhesives, and in particular relates to a method for preparing a Xanthoceras sorbifolia oil-based adhesive for table tennis rackets. Background Art

[0002] Adhesives have an important influence on the performance of rackets. Their bonding strength not only affects the durability of the racket, but also determines the stability of the racket in long-term use. Adhesives can also affect the elasticity of the racket, thereby affecting the batting feedback and feel of the racket. At present, there are many types of adhesives for table tennis rackets, and the most widely used ones are epoxy resin adhesives, phenolic resin adhesives, etc.

[0003] Han Kunlin et al. prepared epoxy resin adhesive samples for table tennis rackets with different 2-methylimidazole contents by melt blending method, and studied the effect of 2-methylimidazole content on the microstructure and mechanical properties of epoxy resin adhesive samples. The results showed that the impact strength, tensile strength, elongation at break and elastic modulus of the adhesive prepared when the 2-methylimidazole content was 0.8% were the largest, which were 13.3 kJ / m 2 , 51.59MPa, 3.26% and 2801.3MPa (see "Han Kunlin. Preparation and mechanical properties of adhesives for table tennis rackets [J]. Adhesion, 2022, 49(08): 39-42").

[0004] Zhang Ying et al. studied the effects of catalyst dosage and phenol / formaldehyde molar ratio on the dry / wet bonding strength and viscosity of adhesives for table tennis rackets. The results showed that when the phenol / formaldehyde molar ratio was 1:1.975 and the catalyst content was 3%, the maximum bonding strength, solid content and viscosity were achieved. At this time, the bonding strength of the adhesive reached 3.18 MPa, and the solid content and viscosity reached 52% and 121 mPa·s respectively (see "Zhang Ying. Preparation and performance study of adhesives for table tennis rackets [J]. Aging and Application of Synthetic Materials, 2021, 50(03): 109-111").

[0005] Lei Di et al. used in-situ chlorination graft copolymerization to prepare a new formaldehyde-free adhesive for plywood. The main component of the adhesive is HDPE grafted with maleic anhydride (MAH) (PE-cg-MAH). The optimal formula of the adhesive and the optimal hot pressing conditions for preparing table tennis rackets were studied. The results showed that the optimal hot pressing conditions for table tennis rackets made with PE-cg-MAH as an adhesive were 160-165°C and 5 minutes. When the chlorine content was about 3% (wt), its tensile strength and elongation at break reached 3.05MPa and 50.4%, respectively (see "Lei Di. Preparation and performance study of new table tennis racket surface adhesive [J]. Aging and Application of Synthetic Materials, 2021, 50(05): 120-122+152").

[0006] Domestic table tennis racket baseboard glue mostly uses petroleum-based raw materials. Commonly used phenolic resin adhesives contain harmful formaldehyde components, and their environmental protection and health safety are questionable. Although epoxy resin adhesives are known for their high strength and low shrinkage, they have problems with the glue layer being too hard and having poor elasticity after curing, which affects the feel of the racket and the player's control experience.

[0007] Therefore, there is an urgent need for an environmentally friendly adhesive for table tennis rackets with excellent bonding and elastic properties to solve the above problems. Summary of the invention

[0008] In order to solve the above technical problems, the present invention proposes a method for preparing a Xanthoceras sorbifolia oil-based adhesive for table tennis rackets.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] The invention provides a method for preparing a Xanthoceras sorbifolia oil-based adhesive for a table tennis racket. The method comprises the following steps: mixing Xanthoceras sorbifolia oil dimethacrylate and acrylated epoxy Xanthoceras sorbifolia oil, adding 2-ethyl methylacrylate isocyanate and an initiator, and stirring to obtain the Xanthoceras sorbifolia oil-based adhesive for a table tennis racket.

[0011] Preferably, the mass ratio of the Xanthoceras sorbifolia oil dimethacrylate to the acrylated epoxidized Xanthoceras sorbifolia oil is 7:3.

[0012] Preferably, the added amount of the 2-ethyl isocyanate methylacrylate accounts for 0 to 40% of the mass of the Xanthoceras sorbifolia oil-based adhesive for table tennis rackets, and is not 0.

[0013] Preferably, the added amount of the initiator accounts for 2% of the mass of the Xanthoceras sorbifolia oil-based adhesive for table tennis rackets.

[0014] Preferably, the preparation method of the Xanthoceras sorbifolia oil dimethacrylate comprises the following steps: mixing diethanolamine, sodium methoxide and Xanthoceras sorbifolia oil, stirring and reacting at 120°C for 4 hours to obtain amidated Xanthoceras sorbifolia oil; mixing the obtained amidated Xanthoceras sorbifolia oil, methacrylic anhydride and 4-dimethylaminopyridine, stirring and reacting at 65°C for 5 hours to obtain the Xanthoceras sorbifolia oil dimethacrylate.

[0015] Preferably, the preparation method of the acrylated epoxidized Xanthoceras sorbifolia oil comprises the following steps: mixing Xanthoceras sorbifolia oil, a cation exchange resin and glacial acetic acid, then adding H2O2 and reacting at 65°C for 3 hours to obtain the epoxidized Xanthoceras sorbifolia oil; mixing the obtained epoxidized Xanthoceras sorbifolia oil and a catalyst, then adding acrylic acid dropwise at 80°C, then heating to 100°C and stirring for reaction for 4 hours to obtain the acrylated epoxidized Xanthoceras sorbifolia oil.

[0016] Preferably, the initiator is dibenzoyl peroxide.

[0017] Preferably, the stirring treatment is carried out at room temperature, with a rotation speed of 300 r / min and a time of 10 min.

[0018] The present invention provides a Xanthoceras sorbifolia oil-based adhesive for table tennis rackets prepared by the preparation method described in the above technical scheme.

[0019] The present invention also provides the use of the Xanthoceras sorbifolia oil-based adhesive for table tennis rackets described in the above technical solution as an adhesive for a bottom plate of a table tennis racket.

[0020] Technical principle of the present invention: Vegetable oil is composed of triglycerides, and due to the hydrophobicity of its fatty acid chain, it is an ideal raw material for preparing water-resistant adhesives. The characteristic functional groups of triglycerides (such as C=C bonds and ester groups) provide conditions for preparing a variety of vegetable oil polymers, which can be used as substitutes for petroleum counterparts. The C=C bonds in triglyceride molecules have low reactivity. The present invention converts Xanthoceras sorbifolia oil into acrylated epoxidized Xanthoceras sorbifolia oil through epoxidation and acrylate for the preparation of Xanthoceras sorbifolia oil-based adhesives for table tennis rackets; at the same time, Xanthoceras sorbifolia oil is synthesized into dimethacrylate based on Xanthoceras sorbifolia oil through amidation and methacrylate, which contains two highly reactive C=C bonds and shows low viscosity due to its small molecular weight. Furthermore, the present invention uses Xanthoceras sorbifolia oil dimethacrylate as an active diluent for acrylated epoxidized Xanthoceras sorbifolia oil to prepare vegetable oil-based thermosetting adhesives. On this basis, in order to solve the problem of low cohesion of adhesive and poor interfacial bonding with wood, the difunctional monomer isocyanurate methacrylate (IEM) was selected to participate in the reaction. IEM can cross-link with Xanthoceras sorbifolia oil dimethacrylate (MXOEA) and acrylated epoxidized Xanthoceras sorbifolia oil (AEXO) to increase the cohesion of the polymer, and can couple with the -OH group on the wood to improve the interfacial bonding between the substrate and the adhesive, which is more convenient, economical and effective to improve the interfacial bonding between the wood and the adhesive.

[0021] The present invention uses Xanthoceras sorbifolia oil to prepare an adhesive for table tennis rackets. The oil content of Xanthoceras sorbifolia kernels is 50% to 70%, and the fatty acids in the oil are mostly unsaturated fatty acids, and the content can reach 92%, which is higher than common vegetable oils such as soybean oil, peanut oil, corn oil and olive oil. Although unsaturated fatty acids make chemical properties unstable, the presence of a large number of unsaturated double bonds can provide abundant reaction sites for the preparation of adhesives. Therefore, the present invention uses Xanthoceras sorbifolia oil to prepare an adhesive with excellent bonding performance and elasticity.

[0022] Compared with the prior art, the present invention has the following advantages and technical effects:

[0023] In the current field of adhesive technology, especially for the bonding application of table tennis racket bottom plate, a high-performance sports equipment, it is rare to use bio-based raw materials as the core component. The present invention not only fills this gap, but also achieves significant performance improvement. The Xanthoceras sorbifolia oil-based adhesive prepared by the method of the present invention, when the addition amount of IEM is 10%, the bonding strength of the table tennis racket bottom plate obtained by bonding reaches 2.60MPa, which is much higher than the minimum requirement (0.7MPa) stipulated in the national standard for plywood for table tennis rackets, and has excellent bonding performance. In addition, the adhesive also gives the table tennis racket bottom plate excellent elastic properties, with an elastic modulus of up to 8086MPa and a static bending strength of 80.60MPa. These indicators all show that the adhesive has excellent bonding properties while also ensuring the excellent flexibility and rebound effect of the table tennis racket, achieving the high standard requirements of table tennis for racket surface performance.

[0024] The present invention utilizes Xanthoceras sorbifolia oil to prepare a bio-based adhesive, which has obvious advantages in environmental protection, meets the requirements of sustainable development, and helps to promote the green transformation of the table tennis racket industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0026] Figure 1 A process flow chart of the preparation method and performance testing of the Xanthoceras sorbifolia oil-based adhesive for table tennis rackets provided by the present invention;

[0027] Figure 2 The infrared spectra of the Xanthoceras sorbifolia oil-based adhesives prepared in Example 1 and Comparative Example 1;

[0028] Figure 3 Thermogravimetric analysis diagrams of the Xanthoceras sorbifolia oil-based adhesives prepared in Example 1 and Comparative Example 1. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] An embodiment of the present invention provides a method for preparing a Xanthoceras sorbifolia oil-based adhesive for a table tennis racket, comprising the following steps: mixing Xanthoceras sorbifolia oil dimethacrylate (MXOEA) and acrylated epoxidized Xanthoceras sorbifolia oil (AEXO), adding 2-isocyanatoethyl methacrylate (IEM) and an initiator, and stirring to obtain the Xanthoceras sorbifolia oil-based adhesive for a table tennis racket.

[0032] The invention uses Xanthoceras sorbifolia oil dimethacrylate as an active diluent of acrylated epoxidized Xanthoceras sorbifolia oil to prepare a vegetable oil-based thermosetting adhesive, and then selects a bifunctional monomer isocyanoethyl methacrylate (IEM) to participate in the reaction. The IEM can be cross-linked with Xanthoceras sorbifolia oil dimethacrylate (MXOEA) and acrylated epoxidized Xanthoceras sorbifolia oil (AEXO) to increase the cohesion of the polymer, and can be coupled with -OH groups on wood to improve the interface bonding between the substrate and the adhesive, thereby more conveniently, economically and effectively improving the interface bonding between the wood and the adhesive.

[0033] In a preferred embodiment, the mass ratio of the Xanthoceras sorbifolia oil dimethacrylate to the acrylated epoxidized Xanthoceras sorbifolia oil is 7:3.

[0034] In a preferred embodiment, the preparation method of the Xanthoceras sorbifolia oil dimethacrylate comprises the following steps: mixing diethanolamine, sodium methoxide and Xanthoceras sorbifolia oil, stirring and reacting at 120°C for 4 hours to obtain amidated Xanthoceras sorbifolia oil; mixing the obtained amidated Xanthoceras sorbifolia oil, methacrylic anhydride (MAA) and 4-dimethylaminopyridine (DMAP), stirring and reacting at 65°C for 5 hours to obtain the Xanthoceras sorbifolia oil dimethacrylate (MXOEA).

[0035] In a preferred embodiment, the mass ratio of diethanolamine, sodium methoxide and Xanthoceras sorbifolia oil is 124.9:1.62:200.

[0036] In a preferred embodiment, the stirring reaction at 120° C. for 4 hours further includes washing and rotary vacuum evaporation steps; the detergent used for the washing is a saturated NaCl solution.

[0037] In a preferred embodiment, the mass ratio of the amidated Xanthoceras sorbifolia oil to methacrylic anhydride is 66.25:115.5, and the amount of 4-dimethylaminopyridine used is 2% of the mass of the amidated Xanthoceras sorbifolia oil.

[0038] In a preferred embodiment, the stirring reaction at 65°C for 5 hours further includes washing and rotary vacuum evaporation steps; the washing detergents used are saturated NaHCO3 solution and saturated NaCl solution. The present invention uses saturated NaHCO3 solution for washing in order to neutralize the unreacted acid, and the saturated NaCl solution can be used to wash away the salts obtained in the previous step. The present invention evaporates most of the water in the obtained product through rotary vacuum evaporation to avoid the generation of a large amount of steam at high temperature due to the high water content in the adhesive, and then the air pressure during the subsequent hot pressing process when the pressure is released causes the plywood to be blown open, resulting in experimental failure.

[0039] In a preferred embodiment, the preparation method of the acrylated epoxidized Xanthoceras sorbifolia oil comprises the following steps: mixing Xanthoceras sorbifolia oil, a cation exchange resin and glacial acetic acid, then adding H2O2 and reacting at 65°C for 3 hours to obtain epoxidized Xanthoceras sorbifolia oil; mixing the obtained epoxidized Xanthoceras sorbifolia oil and a catalyst, then adding acrylic acid (AA) dropwise at 80°C, then heating to 100°C and stirring for reaction for 4 hours to obtain the acrylated epoxidized Xanthoceras sorbifolia oil (AEXO).

[0040] In a preferred embodiment, the usage ratio of Xanthoceras sorbifolia oil, cation exchange resin, glacial acetic acid, and H2O2 is 50g:1.5g:45mL:125mL.

[0041] In a preferred embodiment, the cation exchange resin is an H-type cation exchange resin; the H-type cation exchange resin includes IR-120 (CAS No.: 78922-04-0).

[0042] In a preferred embodiment, the mass concentration of H2O2 is 30%, and the addition method is slow dripping.

[0043] In a preferred embodiment, the step of washing is further included after reacting at 65° C. for 3 hours; the detergent used for the washing is a saturated Na 2 CO 3 solution and a saturated saline solution.

[0044] In a preferred embodiment, the usage ratio of the epoxidized Xanthoceras sorbifolia oil, acrylic acid and catalyst is 100 g: 25 mL: 3.75 g; and the catalyst is triphenylphosphine.

[0045] In a preferred embodiment, the added amount of the 2-methylisocyanate isocyanate accounts for 0 to 40% of the mass of the Xanthoceras sorbifolia oil-based adhesive for table tennis rackets, and is not 0, preferably 5 to 20%, and further preferably 10 to 20%.

[0046] In a preferred embodiment, the added amount of the initiator accounts for 2% of the mass of the Xanthoceras sorbifolia oil-based adhesive for table tennis rackets.

[0047] In a preferred embodiment, the initiator is dibenzoyl peroxide (BPO).

[0048] In a preferred embodiment, the stirring treatment is carried out at room temperature, with a rotation speed of 300 r / min and a time of 10 min.

[0049] The present invention provides a Xanthoceras sorbifolia oil-based adhesive for table tennis rackets prepared by the preparation method described in the above technical scheme.

[0050] The present invention also provides the use of the Xanthoceras sorbifolia oil-based adhesive for table tennis rackets described in the above technical solution as an adhesive for a bottom plate of a table tennis racket.

[0051] In a preferred embodiment, the application is specifically: using Xanthoceras sorbifolia oil-based adhesive for table tennis rackets to apply glue on one side of the bottom plate of the table tennis racket, and the amount of glue applied is 220g / m 2 After being opened for aging for 15 minutes, the mixture was put into a hot press for hot pressing to obtain a table tennis racket bottom plate; the hot pressing process conditions were as follows: hot pressing temperature of 120°C, hot pressing pressure of 1.2 MPa, and hot pressing time of 10 minutes.

[0052] The room temperature in the embodiments of the present invention refers to "25±2°C".

[0053] Unless otherwise specified, the raw materials in the examples of the present invention were purchased from commercial sources.

[0054] Example 1

[0055] A method for preparing a Xanthoceras sorbifolia oil-based adhesive for table tennis rackets, comprising the following specific steps:

[0056] (1) 124.9 g of diethanolamine, 1.62 g of sodium methoxide and 200 g of Xanthoceras sorbifolia oil were mixed, stirred and reacted at 120° C. for 4 h, then the reaction product was washed with a saturated NaCl solution, and the residual saturated NaCl solution was removed by rotary vacuum evaporation to obtain amidated Xanthoceras sorbifolia oil. 66.25 g of the amidated Xanthoceras sorbifolia oil, 115.5 g of methacrylic anhydride and 2% of 4-dimethylaminopyridine based on the mass of the amidated Xanthoceras sorbifolia oil were mixed, stirred and reacted at 65° C. for 5 h, then the reaction product was washed with a saturated NaHCO3 solution until no bubbles were generated, then the reaction product was washed with a saturated NaCl solution, and the residual saturated NaCl solution was removed by rotary vacuum evaporation to obtain Xanthoceras sorbifolia oil dimethacrylate (MXOEA).

[0057] (2) 50g of Xanthoceras sorbifolia oil, 1.5g of cation exchange resin and 45mL of glacial acetic acid were mixed, and then 125mL of H2O2 with a mass concentration of 30% was slowly added dropwise, and the reaction was carried out at 65°C for 3h. The product was washed alternately with saturated Na2CO3 solution and saturated saline until neutral, and epoxidized Xanthoceras sorbifolia oil was obtained. 100g of the above epoxidized Xanthoceras sorbifolia oil and 3.75g of triphenylphosphine were mixed, and then 25mL of acrylic acid was added dropwise at 80°C, and then the temperature was raised to 100°C and stirred for reaction for 4h to obtain acrylated epoxidized Xanthoceras sorbifolia oil (AEXO).

[0058] (3) Add the MXOEA prepared in step (1), the AEXO, IEM and BPO prepared in step (2) into a reaction container at room temperature (wherein the mass ratio of MXOEA to AEXO is 7:3, the amount of IEM accounts for 10% of the mass of the Xanthoceras sorbifolia oil-based adhesive, and the amount of BPO accounts for 2% of the mass of the Xanthoceras sorbifolia oil-based adhesive), turn on the stirring device of the reactor, stir and react for 10 minutes, maintain a stirring speed of 300 r / min during the reaction process, and turn off the stirring device after the reaction is completed to obtain the Xanthoceras sorbifolia oil-based adhesive.

[0059] Example 2

[0060] The difference from Example 1 is that in step (3), the amount of IEM used accounts for 20% of the mass of the Xanthoceras sorbifolia oil-based adhesive, and the other steps are the same as Example 1.

[0061] Example 3

[0062] The difference from Example 1 is that in step (3), the amount of IEM used accounts for 30% of the mass of the Xanthoceras sorbifolia oil-based adhesive, and the other steps are the same as Example 1.

[0063] Example 4

[0064] The difference from Example 1 is that in step (3), the amount of IEM used accounts for 40% of the mass of the Xanthoceras sorbifolia oil-based adhesive, and the other steps are the same as Example 1.

[0065] Comparative Example 1

[0066] The difference from Example 1 is that in step (3), the amount of IEM used accounts for 0% of the mass of the Xanthoceras sorbifolia oil-based adhesive, and the other steps are the same as Example 1.

[0067] Comparative Example 2

[0068] The difference from Example 1 is that in step (3), the mass ratio of MXOEA to AEXO is 5:3, and the other steps are the same as Example 1.

[0069] Comparative Example 3

[0070] The difference from Example 1 is that in step (3), the mass ratio of MXOEA to AEXO is 9:3, and the other steps are the same as Example 1.

[0071] Comparative Example 4

[0072] Step (1) is the same as step (1) of Example 1;

[0073] (2) Adding the MXOEA, IEM and BPO prepared in step (1) into a reaction vessel at room temperature (wherein the amount of IEM accounts for 10% of the mass of the Xanthoceras sorbifolia oil-based adhesive, and the amount of BPO accounts for 2% of the mass of the Xanthoceras sorbifolia oil-based adhesive), turning on the stirring device of the reactor, stirring and reacting for 10 minutes, maintaining a stirring speed of 300 r / min during the reaction process, and turning off the stirring device after the reaction is completed to obtain the Xanthoceras sorbifolia oil-based adhesive.

[0074] Comparative Example 5

[0075] Step (1) is the same as step (2) in Example 1;

[0076] (2) AEXO, IEM and BPO prepared in step (1) are added into a reaction vessel at room temperature (wherein the amount of IEM is 10% of the mass of AEXO and the amount of BPO is 2% of the mass of AEXO), the stirring device of the reactor is turned on, and the reaction is stirred for 10 minutes, and the stirring speed is maintained at 300 r / min during the reaction process. After the reaction is completed, the stirring device is turned off to obtain a Xanthoceras sorbifolia oil-based adhesive.

[0077] Comparative Example 6

[0078] The difference from Example 1 is that the Xanthoceras sorbifolia oil in step (1) and step (2) is replaced by soybean oil, and the other steps are the same as Example 1.

[0079] Application Examples 1 to 4 and Comparative Examples Application Examples 1 to 6

[0080] The adhesives in Examples 1 to 4 and Comparative Examples 1 to 6 were respectively used at 220 g / m 2 The table tennis racket bottom plate was glued on one side with a glue application amount of , and after the gluing was completed, it was left to stand for 15 minutes, and then put into a hot press machine, and hot pressed for 10 minutes at 120°C and 1.2MPa to obtain the table tennis racket bottom plate.

[0081] The dry bonding strength, elastic modulus, static bending strength and wet bonding strength of the table tennis racket bottom plate prepared in Application Examples 1 to 4 and Comparative Application Examples 1 to 6 were tested in accordance with GB / T 17657-2022 "Test methods for physical and chemical properties of wood-based panels and veneered wood-based panels". The results are shown in Table 1.

[0082] Table 1 Performance of table tennis racket bottom plates prepared in Application Examples 1 to 4 and Comparative Examples 1 to 6

[0083]

[0084] Comparing Application Examples 1 to 4 with Comparative Application Example 1, it can be seen that adding IEM can simultaneously improve the dry and wet bonding strength, elastic modulus and static bending strength of the bottom plate of the table tennis racket, but excessive use of IEM will cause the performance of the bottom plate of the table tennis racket to decline. Comparing Application Example 1 with Comparative Application Examples 2 to 3, it can be seen that too little and too much use of MXOEA will cause a significant decrease in the elastic modulus and static bending strength of the bottom plate of the table tennis racket. In addition, although the dry bonding strength of Comparative Application Examples 2 to 3 is similar to or even higher than that of Application Examples 3 to 4, its elastic modulus and static bending strength are significantly lower than those of Application Examples 3 to 4, indicating that the use of the adhesive in Comparative Examples 2 to 3 cannot obtain a bottom plate of the table tennis racket with excellent bonding performance, excellent flexibility and rebound effect at the same time. Comparison of Application Example 1 and Comparative Application Examples 4-5 shows that omitting AEXO will reduce both the dry and wet bonding strength, elastic modulus and static bending strength of the bottom plate of the table tennis racket, and omitting MXOEA will lead to experimental failure and failure to produce Xanthoceras sorbifolia oil-based adhesive. Comparison of Application Example 1 and Comparative Application Example 6 shows that replacing Xanthoceras sorbifolia oil with soybean oil will lead to a decrease in all performances of the bottom plate of the table tennis racket.

[0085] Figure 1 The present invention provides a process flow chart of the preparation method and detection process of the Xanthoceras sorbifolia oil-based adhesive for table tennis rackets.

[0086] The Xanthoceras sorbifolia oil-based adhesive prepared in Example 1 and Comparative Example 1 was measured by infrared spectroscopy (FTIR). The results are shown in Figure 2 , wherein XA represents comparative example 1 and XA-IEM10 represents example 1.

[0087] Depend on Figure 2 It can be seen that the isocyanate groups in IEM may react with the hydroxyl groups in AEXO to produce carbamate linkages. Compared with XA, the infrared spectrum of XA-IEM10 shows a decrease at 3433 cm -1 The intensity of the hydroxyl group of AEXO decreased and the peak at 1565 cm -1 A new peak appears at , which is attributed to the bending vibration of the NH bond caused by the carbamate bond, indicating that IEM reacts with AEXO.

[0088] Thermogravimetric analysis (TG) was performed on the Xanthoceras sorbifolia oil-based adhesives prepared in Example 1 and Comparative Example 1. The results are shown in Figure 3 , wherein XA represents comparative example 1 and XA-IEM10 represents example 1.

[0089] Depend on Figure 3It can be seen that the two Xanthoceras sorbifolia oil-based adhesives maintained a constant weight in the temperature range of 0℃-269℃, and no weight loss occurred. In the temperature range of 269℃-496℃, the TG curve of Xanthoceras sorbifolia oil-based adhesive changed greatly, with obvious mass loss, which was mainly attributed to the cleavage of amide groups from MXOEA, the pyrolysis of ester bonds, and the degradation of hydrocarbon chains. The weight loss temperature of XA-IEM10 was slightly higher than that of XA, which may be due to the reduction in the number of free hydroxyl bonds in XA-IEM10.

[0090] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for preparing a Xanthoceras sorbifolia oil-based adhesive for table tennis rackets, characterized in that: The following steps are involved: The Xanthoceras sorbifolia oil dimethacrylate and acrylated epoxy Xanthoceras sorbifolia oil are mixed, and 2-ethyl methylacrylate isocyanate and an initiator are added, and the mixture is stirred to obtain the Xanthoceras sorbifolia oil-based adhesive for table tennis rackets.

2. The preparation method according to claim 1, characterized in that: The mass ratio of the Xanthoceras sorbifolia oil dimethacrylate to the acrylated epoxidized Xanthoceras sorbifolia oil is 7:

3.

3. The preparation method according to claim 1, characterized in that: The added amount of the 2-methylisocyanate ethyl ester accounts for 0 to 40% of the mass of the Xanthoceras sorbifolia oil-based adhesive for table tennis rackets, and is not 0.

4. The preparation method according to claim 1, characterized in that: The added amount of the initiator accounts for 2% of the mass of the Xanthoceras sorbifolia oil-based adhesive for table tennis rackets.

5. The preparation method according to claim 1, characterized in that: The preparation method of the Xanthoceras sorbifolia oil dimethacrylate comprises the following steps: mixing diethanolamine, sodium methoxide and Xanthoceras sorbifolia oil, stirring and reacting at 120° C. for 4 hours to obtain amidated Xanthoceras sorbifolia oil; mixing the amidated Xanthoceras sorbifolia oil, methacrylic anhydride and 4-dimethylaminopyridine, stirring and reacting at 65° C. for 5 hours to obtain the Xanthoceras sorbifolia oil dimethacrylate.

6. The preparation method according to claim 1, characterized in that: The preparation method of the acrylated epoxidized Xanthoceras sorbifolia oil comprises the following steps: mixing Xanthoceras sorbifolia oil, a cation exchange resin and glacial acetic acid, then adding H2O2 to react at 65°C for 3h to obtain the epoxidized Xanthoceras sorbifolia oil; mixing the epoxidized Xanthoceras sorbifolia oil and a catalyst, then adding acrylic acid dropwise at 80°C, then heating to 100°C and stirring to react for 4h to obtain the acrylated epoxidized Xanthoceras sorbifolia oil.

7. The preparation method according to claim 1, characterized in that: The initiator is dibenzoyl peroxide.

8. The preparation method according to claim 1, characterized in that: The stirring treatment was performed at room temperature, with a rotation speed of 300 r / min and a time of 10 min.

9. The Xanthoceras sorbifolia oil-based adhesive for table tennis rackets prepared by the preparation method according to any one of claims 1 to 8.

10. Use of the Xanthoceras sorbifolia oil-based adhesive for table tennis rackets according to claim 9 as an adhesive for table tennis racket bottom plates.

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