Transparent stone splicing adhesive and preparation method thereof

Abstract

This invention belongs to the field of stone adhesive technology, specifically relating to a transparent stone splicing adhesive and its preparation method. The adhesive comprises a resin component and a curing component. The resin component includes maleic anhydride, phthalic anhydride, diol, catalyst, polymerization inhibitor, and crosslinking monomers, etc., and the diol includes at least 1,2-propanediol. The curing component includes an accelerator composed of dimethylaniline and zinc adipate, and a benzoyl peroxide initiator. The adhesive of this invention is colorless and transparent after curing, exhibits excellent resistance to yellowing, is easy to apply, and after curing with fillers, possesses excellent shear strength, water shear strength, and impact resistance. It can be widely used in high-end stone splicing, repair, and craft bonding.

Description

Technical Field

[0001] This invention belongs to the field of stone adhesive technology, specifically relating to a transparent stone splicing adhesive and its preparation method. Background Technology

[0002] With the widespread application of natural stone in architectural decoration, home renovation, and handicrafts, especially in high-end stones (such as marble, granite, and quartz), the demand for aesthetics and structural stability in splicing, repair, and fixing processes is increasing, leading to a continuous growth in market demand for stone splicing adhesives. These adhesives not only need to possess excellent bonding strength to ensure the structural safety of the spliced ​​stone, but also need to maintain high transparency after curing, resulting in a natural and consistent appearance at the joints, satisfying the pursuit of refined aesthetics in high-end decoration. Therefore, developing stone adhesives that combine excellent optical properties with reliable mechanical properties has become an important development direction in this field.

[0003] Currently, marble adhesive is the most commonly used quick positioning and bonding material in the home decoration and stone processing industry, primarily based on an unsaturated polyester resin system. This type of adhesive features rapid curing and high initial bond strength, making it suitable for quick positioning, repair, and bonding of non-structural load-bearing areas of stone. However, in practical use, traditional marble adhesive has revealed several shortcomings. For example, after curing, it is brittle and lacks toughness, easily cracking or even chipping when subjected to external impacts or vibrations, affecting the long-term stability of the bonded area. Under outdoor or sunlight conditions, the adhesive layer is prone to powdering and yellowing, leading to decreased transparency and affecting the overall decorative effect of the stone. In long-term humid environments, its bond strength decreases significantly, easily leading to detachment, limiting its application in damp environments such as bathrooms and kitchens. Furthermore, when used for thicker adhesive layers or large-area filling bonding, internal cracking or hollowing is prone to occur, further reducing the reliability and service life of the bond.

[0004] The aforementioned shortcomings make traditional marble adhesives unable to meet the higher requirements for adhesives in today's high-end stone processing and installation. High-end stone is often expensive, and has extremely strict requirements for processing precision and the aesthetics of the finished product. The transparency, weather resistance, and long-term reliability of the joints directly affect the quality and value of the final product. The deficiencies of existing marble adhesives in terms of yellowing resistance, water resistance, impact resistance, and stability in thick-layer construction not only increase the risk of rework but also limit their widespread use in high-end applications.

[0005] Therefore, developing stone splicing adhesives with high transparency, strong adhesion, excellent weather resistance, good seismic resistance, and construction stability to overcome the shortcomings of existing products such as high brittleness, easy yellowing, poor water resistance, and thick-layer cracking, and thus better meet the ever-increasing demand for comprehensive performance of adhesives in the high-end stone processing and decoration industry, has considerable practical significance. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a transparent stone splicing adhesive and its preparation method.

[0007] The purpose of this invention is to solve or partially solve the problems of insufficient performance of existing marble adhesives in terms of transparency, yellowing resistance, and stability in thick-layer construction, so as to better meet the higher requirements of high-end stone processing and installation for the comprehensive performance of adhesives.

[0008] The first aspect of this invention provides a transparent stone splicing adhesive, comprising a resin component and a curing component; The resin components, by mass, include the following raw materials: Maleic anhydride 190–210 parts Phthalic anhydride 138-150 parts 200-240 parts of diol, Catalyst 0.3-0.5 parts, Polymerization inhibitor 0.2-0.3 parts, 350-420 parts of crosslinking monomer, Antioxidant (2,6-di-tert-butyl-p-cresol): 5.0 parts 3.0–6.0 parts of silane coupling agent, Low shrinkage additive 5.0~8.5 parts.

[0009] As a further optimization of the aforementioned transparent stone splicing adhesive, the diol includes at least 1,2-propanediol.

[0010] As a further optimization of the above-mentioned transparent stone splicing adhesive, the diol is a compound of 1,2-propanediol and neopentyl glycol, or a compound of 1,2-propanediol and diethylene glycol.

[0011] As a further optimization of the aforementioned transparent stone splicing adhesive, the curing components include an accelerator and an initiator. The accelerator is a mixture of dimethylaniline and zinc diadiazine, and the initiator is benzoyl peroxide.

[0012] As a further optimization of the above-mentioned transparent stone splicing adhesive, the crosslinking monomer is styrene, or a mixture of styrene and methyl methacrylate.

[0013] As a further optimization of the aforementioned transparent stone splicing adhesive, the resin component also includes a light stabilizer.

[0014] As a further optimization of the aforementioned transparent stone splicing adhesive, the polymerization inhibitor is hydroquinone or tert-butylcatechol.

[0015] A second aspect of this invention provides a method for preparing the above-mentioned transparent stone splicing adhesive, comprising the following steps: Step 1: Maleic anhydride, phthalic anhydride, diol and catalyst are added to the reaction vessel and polycondensation reaction is carried out under nitrogen protection by heating. Step 2: After the acid value of the reaction system drops below 50 mg KOH / g, vacuum is applied to continue the reaction until the acid value drops to 25-35 mg KOH / g. Step 3: Cool down to 80-90℃, add polymerization inhibitor, stir to dissolve, then add crosslinking monomer, mix evenly and filter to obtain resin component; Step four: Mix the resin component and the curing component according to the usage ratio to obtain a transparent stone splicing adhesive that can be cured at room temperature.

[0016] As a further optimization of the preparation method of the above-mentioned transparent stone splicing adhesive, in step one, the heating condensation reaction includes: first heating to 160-165℃ and holding at that temperature for reflux, then heating to 175-180℃ and holding at that temperature, and finally heating to 190-200℃ to react until the acid value meets the standard; in step two, the vacuum degree during vacuuming is -0.08 to -0.09 MPa, and the vacuuming time is 30-60 minutes.

[0017] As a further optimization of the preparation method of the above-mentioned transparent stone splicing adhesive, the mixing ratio of the resin component and the curing component is as follows: based on 100 parts by weight of the resin component, the amount of accelerator is 0.3 to 0.5 parts and the amount of initiator is 2 to 3 parts.

[0018] Beneficial effects This invention provides a transparent stone splicing adhesive. By optimizing the raw material composition and preparation process of the unsaturated polyester resin, the resulting adhesive achieves a significant improvement in overall performance. Specifically, the adhesive, after curing, is colorless and transparent, exhibiting excellent light transmittance, which meets the stringent aesthetic requirements of high-end stone splicing. It also possesses excellent resistance to yellowing, maintaining stable appearance even after long-term use or in outdoor environments. Furthermore, the adhesive exhibits good workability, producing a dense and stable adhesive layer after curing. Therefore, this transparent stone splicing adhesive can be widely used in home decoration stone splicing, high-end stone repair, and stone craft bonding, and is particularly suitable for high-end stone processing scenarios requiring high transparency and weather resistance. Detailed Implementation

[0019] Example 1 (a) Ingredients and dosage Resin composition: maleic anhydride (MA): 196 parts Phthalic anhydride (PA): 148 parts 1,2-Propanediol (PG): 228 parts Catalyst (zinc acetate): 0.4 parts Polymerization inhibitor (hydroquinone): 0.25 parts Styrene (St): 375 parts Antioxidant (2,6-di-tert-butyl-p-cresol): 5.0 parts Silane coupling agent (KH-570): 4.5 parts Low-shrinkage additive (polyvinyl acetate): 6.5 parts Curing system (based on 100 parts of resin): Accelerator (dimethylaniline + zinc diadipate, mass ratio 1:1): 0.35 parts Initiator (benzoyl peroxide): 2 parts (II) Preparation process Add maleic anhydride, phthalic anhydride, antioxidant, silane coupling agent, low-shrinkage agent, 1,2-propanediol, and zinc acetate to a four-necked flask equipped with a stirrer, thermometer, nitrogen delivery tube, and condenser. Purge with dry nitrogen at a flow rate of 2-3 bubbles / second to prevent oxidation and discoloration. Heat the system to 160-165°C and reflux for 1.5 hours, at which point the acid value is approximately 200 mg KOH / g. Then, heat to 175-180°C and hold for 2 hours to reduce the acid value to 135 mg KOH / g. Next, heat to 195°C and react for 1.8 hours. Once the acid value drops to ≤50 mg KOH / g, turn on the vacuum system and evacuate at -0.085 MPa for 45 minutes to further reduce the acid value to 30 mg KOH / g. Before discharging, confirm that the system is clear and free of turbidity. When the system cools down to 85°C, add hydroquinone and stir until it is completely dissolved. Then slowly add styrene and continue stirring until the system is homogeneous and transparent. After filtering through a 150-mesh filter, store it in a light-proof and sealed container to obtain the target transparent resin.

[0020] When using, add 0.35% of the accelerator (dimethylaniline + zinc adipate) and 2% of the initiator benzoyl peroxide to the obtained resin, mix well, and then cure at room temperature.

[0021] Example 2 (a) Ingredients and dosage maleic anhydride (MA): 196 parts Phthalic anhydride (PA): 148 parts 1,2-Propanediol (PG): 218 parts Diethylene glycol (DEG): 10 parts Catalyst (zinc acetate): 0.4 parts Polymerization inhibitor (hydroquinone): 0.25 parts Styrene (St): 350 parts Antioxidant (2,6-di-tert-butyl-p-cresol): 5.0 parts Silane coupling agent (KH-570): 4.5 parts Low-shrinkage additive (polyvinyl acetate): 6.5 parts Methyl methacrylate (MMA): 25 parts Curing system (based on 100 parts of resin): Accelerator (dimethylaniline + zinc diadipate, mass ratio 1:1): 0.35 parts Initiator (benzoyl peroxide): 2 parts (II) Preparation process Maleic anhydride, phthalic anhydride, antioxidant, silane coupling agent, low-shrinkage agent, 1,2-propanediol, diethylene glycol, and zinc acetate were added to a four-necked flask equipped with a stirrer, thermometer, nitrogen delivery tube, and condenser. Dry nitrogen gas was then introduced, with the flow rate controlled at 2-3 bubbles / second to prevent oxidation and discoloration of the system. The subsequent heating, polycondensation, vacuuming, and cooling post-treatment steps were completely consistent with those in Example 1, except that during the dilution stage, styrene and methyl methacrylate were mixed in proportion and slowly added to the system, continuously stirred until homogeneous and transparent. After filtration through a 150-mesh filter, the resin was stored in a light-proof, sealed container to obtain the target transparent resin.

[0022] When using, add 0.35% of the accelerator (dimethylaniline + zinc adipate) and 2% of the initiator benzoyl peroxide to the obtained resin, mix well, and then cure at room temperature.

[0023] Example 3 (a) Ingredients and dosage maleic anhydride (MA): 205 parts Phthalic anhydride (PA): 139 parts 1,2-Propanediol (PG): 228 parts Catalyst (zinc acetate): 0.4 parts Polymerization inhibitor (tert-butylcatechol, TBC): 0.22 parts Styrene (St): 375 parts Antioxidant (2,6-di-tert-butyl-p-cresol): 5.0 parts Silane coupling agent (KH-570): 4.5 parts Low-shrinkage additive (polyvinyl acetate): 6.5 parts Curing system (based on 100 parts of resin): Accelerator (dimethylaniline + zinc diadipate, mass ratio 1:1): 0.3 parts Initiator (benzoyl peroxide): 2.5 parts (II) Preparation process Maleic anhydride, phthalic anhydride, antioxidant, silane coupling agent, low-shrinkage agent, 1,2-propanediol, and zinc acetate were added to a four-necked flask equipped with a stirrer, thermometer, nitrogen delivery tube, and condenser. Dry nitrogen gas was then introduced, with the flow rate controlled at 2-3 bubbles / second to prevent oxidation and discoloration of the system. The subsequent heating, polycondensation, vacuuming, and cooling post-treatment steps were exactly the same as in Example 1, except that the polymerization inhibitor was replaced with tert-butylcatechol, which was added and stirred to dissolve at 85°C. Styrene was then slowly added, and stirring continued until homogeneous and transparent. After filtration through a 150-mesh filter, the resin was stored in a light-proof, sealed container to obtain the target transparent resin.

[0024] When using, add 0.3% of the resin mass of accelerator (dimethylaniline + zinc adipate) and 2.5% of the resin mass of initiator benzoyl peroxide to the obtained resin, mix well and then cure at room temperature.

[0025] Example 4 (a) Ingredients and dosage maleic anhydride (MA): 196 parts Phthalic anhydride (PA): 148 parts 1,2-Propanediol (PG): 180 parts Neopentyl glycol (NPG): 50 parts Catalyst (zinc acetate): 0.4 parts Polymerization inhibitor (hydroquinone): 0.25 parts Styrene (St): 375 parts Light stabilizer (UV-531): 2 parts Antioxidant (2,6-di-tert-butyl-p-cresol): 5.0 parts Silane coupling agent (KH-570): 4.5 parts Low-shrinkage additive (polyvinyl acetate): 6.5 parts Curing system (based on 100 parts of resin): Accelerator (dimethylaniline + zinc diadipate, mass ratio 1:1): 0.4 parts Initiator (benzoyl peroxide): 2 parts (II) Preparation process Maleic anhydride, phthalic anhydride, antioxidant, silane coupling agent, low-shrinkage agent, 1,2-propanediol, neopentyl glycol, and zinc acetate were added to a four-necked flask equipped with a stirrer, thermometer, nitrogen delivery tube, and condenser. Dry nitrogen gas was introduced, and the flow rate was controlled at 2-3 bubbles / second to prevent oxidation and discoloration of the system. The subsequent heating, polycondensation, and vacuuming steps were exactly the same as in Example 1. When the system cooled to 85°C, hydroquinone and light stabilizer UV-531 were added and stirred until completely dissolved. Then, styrene was slowly added, and stirring was continued until homogeneous and transparent. After filtration through a 150-mesh filter, the resin was stored in a dark, sealed container to obtain the target transparent resin.

[0026] When using, add 0.4% of the resin mass of accelerator (dimethylaniline + zinc adipate) and 2% of the initiator benzoyl peroxide to the obtained resin, mix well and then cure at room temperature.

[0027] Example 5 (a) Ingredients and dosage maleic anhydride (MA): 196 parts Phthalic anhydride (PA): 148 parts 1,2-Propanediol (PG): 228 parts Catalyst (zinc acetate): 0.45 parts Polymerization inhibitor (hydroquinone): 0.3 parts Styrene (St): 400 parts Antioxidant (2,6-di-tert-butyl-p-cresol): 5.0 parts Silane coupling agent (KH-570): 4.5 parts Low-shrinkage additive (polyvinyl acetate): 6.5 parts Curing system (based on 100 parts of resin): Accelerator (dimethylaniline + zinc diadipate, mass ratio 1:1): 0.3 parts Initiator (benzoyl peroxide): 3 parts (II) Preparation process Add maleic anhydride, phthalic anhydride, antioxidant, silane coupling agent, low-shrinkage agent, 1,2-propanediol, and zinc acetate to a four-necked flask equipped with a stirrer, thermometer, nitrogen delivery tube, and condenser. Purge with dry nitrogen at a flow rate of 2-3 bubbles / second to prevent oxidation and discoloration. Heat the system to 160-165°C and reflux for 1.5 hours; then heat to 175-180°C and hold for 2 hours; then heat to 190-200°C and react for 2 hours. Once the acid value drops to ≤50 mg KOH / g, turn on the vacuum system and evacuate at -0.09 MPa for 60 minutes to further reduce the acid value to 28 mg KOH / g. Before discharging, confirm that the system is clear and free of turbidity. When the system cools down to 85°C, add hydroquinone and stir until it is completely dissolved. Then slowly add styrene and continue stirring until it is homogeneous and transparent. After filtering through a 150-mesh filter, store it in a light-proof and sealed container to obtain the target transparent resin.

[0028] When using, add 0.3% of the accelerator (dimethylaniline + zinc adipate) and 3% of the initiator benzoyl peroxide to the obtained resin, mix well, and then cure at room temperature.

[0029] Test Example 1 For the transparent stone splicing adhesives prepared in Examples 1-5, various performance indicators were tested in accordance with national standards and industry-standard methods. The test results are recorded in Tables 1 and 2.

[0030] The appearance inspection was carried out by visual inspection. An appropriate amount of resin sample was placed in a colorless and transparent glass bottle and observed under natural light. The results were recorded to determine whether the sample was a colorless and transparent liquid and whether it contained mechanical impurities.

[0031] The acid value test was performed according to GB / T2895-2008 "Plastics Polyester Resins Part 1: Determination of Acid Value". Weigh about 1g of sample into a 250mL Erlenmeyer flask, add 50mL of neutral ethanol-toluene mixed solvent (volume ratio 1:1) to dissolve it, use phenolphthalein as an indicator, and titrate with 0.1mol / L potassium hydroxide-ethanol standard solution until the solution turns pink and does not fade for 30s as the endpoint. Record the volume of standard solution consumed and calculate the acid value (unit: mgKOH / g).

[0032] Viscosity test (25℃) refers to the rotational viscometer method in GB / T10247-2008 "Viscosity Measurement Method". The sample is placed in a constant temperature water bath at 25℃ for 30 min. The dynamic viscosity of the sample at 25℃ is measured using a rotational viscometer (with a suitable rotor). The results are recorded (unit: mPa·s).

[0033] The solid content test is performed according to GB / T1725-2007 "Determination of nonvolatile matter content in paints, varnishes and plastics". Weigh about 1g of sample (accurate to 0.0001g) and place it in a weighing bottle that has been pre-weighed. Dry it in an oven at 105℃±2℃ until it reaches constant weight. Calculate the percentage of nonvolatile matter in the total mass of the sample, which is the solid content (unit: %).

[0034] The transmittance test (0.5mm casting) was conducted in accordance with GB / T2410-1980 "Test Methods for Transmittance and Haze of Transparent Plastics". The cured adhesive was cast into a flat test piece with a thickness of 0.5mm. The transmittance of the test piece was measured at a visible light wavelength (550nm) using a spectrophotometer, and the results were recorded (unit: %).

[0035] The yellowing resistance test is conducted according to the industry-standard UV accelerated aging method (refer to GB / T1766-2008 "Rating Method for Aging of Paint and Varnish Coatings"). The cured adhesive test piece is placed under a UV lamp (wavelength 365nm, power 30W) for 2 hours, and the color change of the test piece is observed visually and recorded.

[0036] Table 1. Results of Appearance and Yellowing Resistance Tests Table 2. Results of Physicochemical and Mechanical Properties Tests Test results show that the transparent stone splicing adhesives prepared in Examples 1-5 all achieved excellent comprehensive performance. As shown in Table 1, all adhesives in all examples were colorless, homogeneous, and transparent liquids, free of mechanical impurities, turbidity, and sediment, meeting the appearance requirements for transparent stone splicing adhesives. In the yellowing resistance test, all examples showed no yellowing after being irradiated with a UV lamp (wavelength 365nm, power 30W) for 2 hours, and there was no visible color difference between the appearance and the color before irradiation, indicating that they possess good yellowing resistance and can effectively prevent yellowing problems during outdoor use. As shown in Table 2, the acid values ​​of all embodiments were controlled within the range of 28~32 mgKOH / g, meeting the acid value endpoint control requirements in the preparation process; the viscosity was between 320~420 mPa·s (25℃), balancing ease of construction and bonding stability; the solid content was 61.0%~65.0%, ensuring the strength of the adhesive layer after curing; and the light transmittance was not less than 85% (0.5mm casting), meeting the transparency requirements of high-end stone splicing. Among all embodiments, Example 4 had the best overall performance. It used a compound of 1,2-propanediol and neopentyl glycol as the diol in the basic formula, and added the light stabilizer UV-531, which had the lowest acid value (28 mgKOH / g), the most suitable viscosity (320 mPa·s), and the highest light transmittance (89%). This made the adhesive easy to operate during construction, resulted in a transparent and beautiful appearance of the bonded area after curing, and provided better long-term stability, better meeting the stringent requirements of high-end stone bonding.

[0037] Test Example 2 For the transparent stone splicing adhesives prepared in Examples 1-5, fillers were added and cured into specimens. The shear strength, water-resistant shear strength and impact resistance were tested according to national standards and industry-standard methods. The test results are recorded in Table 3.

[0038] Take the transparent resin prepared in each embodiment, add filler (glass powder and alumina powder are mixed in a mass ratio of 1:1), the mass ratio of resin component to filler is 1:1, add accelerator and initiator according to the curing system ratio of the corresponding embodiment, and continue stirring until the system is uniform, without lumps or obvious bubbles.

[0039] The above mixture was poured into a mold and cured at room temperature for 24 hours. Then it was placed in a 50°C constant temperature oven for 2 hours for post-curing. After cooling to room temperature, it was demolded to obtain a standard test specimen.

[0040] Shear strength was determined according to GB / T 7124-2021 "Determination of tensile shear strength of adhesives (rigid material to rigid material)" using a universal testing machine at a testing speed of 5 mm / min. Five specimens were prepared for each group, and the average value of the test results was taken as the final shear strength value.

[0041] The water resistance shear strength is tested according to Appendix A (immersion test method) of GB / T 7124-2021. The standard shear specimen is immersed in distilled water at 25℃ for 48 hours. After being removed, the surface moisture is wiped dry with filter paper. The test is then conducted immediately using a universal testing machine according to the above shear strength test method. Five specimens are prepared for each group, and the average value of the test results is taken as the final water resistance shear strength value.

[0042] Impact resistance was tested according to GB / T 1843-2008 "Determination of Impact Strength of Plastic Cantilever Beams". The test was conducted using a cantilever beam impact testing machine. The specimens were unnotched and the test temperature was 25℃. Five specimens were prepared for each group, and the average value of the test results was taken as the final impact resistance value (unit: kJ / m²).

[0043] Table 3. Test results of adhesive properties after curing of compound fillers As shown in Table 3, the transparent stone splicing adhesives prepared in Examples 1 to 5, after adding glass powder and alumina powder composite filler (mass ratio 1:1) and mixing and curing the adhesive and filler at a 1:1 ratio, all exhibit excellent mechanical properties and can meet the actual use requirements of stone splicing.

[0044] Regarding shear strength, the shear strength of all embodiments ranged from 12.5 to 14.6 MPa, with Embodiment 4 exhibiting the highest shear strength (14.6 MPa), a significant improvement compared to other embodiments. This is attributed to the use of a diol system composed of 1,2-propanediol and neopentyl glycol, along with the addition of a light stabilizer, which effectively enhanced the bonding force between the colloid and filler, as well as the overall strength after curing. The water resistance shear strength of all embodiments ranged from 11.2 to 12.9 MPa, maintaining above 85% of the original shear strength, indicating good water resistance stability and adaptability to stone bonding requirements in humid environments. The impact resistance of all embodiments ranged from 3.1 to 3.9 kJ / m², with Embodiment 4 showing the best impact resistance, indicating better toughness of the cured adhesive layer. This effectively resists impacts during stone splicing and use, reducing the risk of adhesive layer cracking.

[0045] in conclusion The transparent stone splicing adhesive prepared in this invention, through the combination of specific diacids / anhydrides, diols, crosslinking monomers, and various additives, along with an optimized preparation process, improves upon some defects of existing marble adhesives. It possesses advantages such as colorless transparency, resistance to yellowing, and convenient application. After curing with fillers, it exhibits excellent shear strength, water shear strength, and impact resistance. The mechanical properties of all embodiments meet the practical requirements for stone splicing, with Example 4 showing the best overall performance, further enhancing the adhesive's bonding reliability and environmental adaptability. This adhesive can be widely used in home decoration stone splicing, high-end stone repair, and stone craft bonding, and is particularly suitable for high-end stone processing fields where high transparency and bonding strength are required.

[0046] The above embodiments are exemplary and are intended to illustrate the technical concept and features of the present invention, so that those skilled in the art can understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A transparent stone splicing adhesive, characterized in that, Includes resin components and curing components; The resin component comprises the following raw materials by mass: Maleic anhydride 190–210 parts Phthalic anhydride 138-150 parts 200-240 parts of diol, Catalyst 0.3-0.5 parts, Polymerization inhibitor 0.2-0.3 parts, 350-420 parts of crosslinking monomer, Antioxidant 4.0–7.0 parts, 3.0–6.0 parts of silane coupling agent, Low shrinkage additive 5.0~8.5 parts.

2. The transparent stone splicing adhesive according to claim 1, characterized in that, The diol includes at least 1,2-propanediol.

3. The transparent stone splicing adhesive according to claim 2, characterized in that, The diol is a mixture of 1,2-propanediol and neopentyl glycol, or a mixture of 1,2-propanediol and diethylene glycol.

4. The transparent stone splicing adhesive according to claim 1, characterized in that, The curing component includes an accelerator and an initiator, wherein the accelerator is a mixture of dimethylaniline and zinc diadiazine, and the initiator is benzoyl peroxide.

5. The transparent stone splicing adhesive according to claim 1, characterized in that, The crosslinking monomer is styrene, or a mixture of styrene and methyl methacrylate.

6. The transparent stone splicing adhesive according to claim 1, characterized in that, The resin components also include light stabilizers.

7. The transparent stone splicing adhesive according to claim 1, characterized in that, The polymerization inhibitor is hydroquinone or tert-butylcatechol.

8. A method for preparing a transparent stone splicing adhesive according to any one of claims 1 to 7, characterized in that, Includes the following steps: Step 1: Maleic anhydride, phthalic anhydride, diol and catalyst are added to the reaction vessel and polycondensation reaction is carried out under nitrogen protection by heating. Step 2: After the acid value of the reaction system drops below 50 mg KOH / g, vacuum is applied to continue the reaction until the acid value drops to 25-35 mg KOH / g. Step 3: Cool down to 80-90℃, add polymerization inhibitor, stir to dissolve, then add crosslinking monomer, mix evenly and filter to obtain resin component; Step four: Mix the resin component and the curing component according to the usage ratio to obtain a transparent stone splicing adhesive that can be cured at room temperature.

9. The preparation method according to claim 8, characterized in that, In step one, the heating polycondensation reaction includes: first heating to 160-165℃ and holding at that temperature under reflux, then heating to 175-180℃ and holding at that temperature, and finally heating to 190-200℃ and reacting until the acid value meets the standard; in step two, the vacuum degree during vacuuming is -0.08 to -0.09 MPa, and the vacuuming time is 30-60 minutes.

10. The preparation method according to claim 8, characterized in that, The mixing ratio of the resin component and the curing component is as follows: based on 100 parts by weight of the resin component, the amount of accelerator is 0.3 to 0.5 parts and the amount of initiator is 2 to 3 parts.

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