A graphene glue with waterproof function and its preparation method

Abstract

The present invention relates to the technical field of preparation of bonding materials, and specifically discloses a graphene glue with waterproof function and a preparation method thereof. The graphene glue with waterproof function comprises the following raw material components in parts by weight: 50-70 parts of polydimethylsiloxane; 4-8 parts of crosslinking agent; 0.5-1 part of catalyst; 1-3 parts of dispersant; 1-5 parts of plasticizer; 10-15 parts of waterproof agent; 5-10 parts of graphene. In the process of preparing the glue with polydimethylsiloxane as the raw material, the present invention adds a waterproof agent to improve the waterproof performance of the prepared glue; in addition, graphene is also added to improve the electrical conductivity of the prepared glue; so that the prepared glue has both waterproof function and electrical conductivity.

Description

Technical Field

[0001] The present invention relates to the technical field of preparation of bonding materials, and particularly relates to a graphene glue with a waterproof function and a preparation method thereof. Background Art

[0002] Sealant is a glue used to fill configuration gaps to play a sealing role. It needs to deform with the shape of the sealing surface, is not easy to flow, and has a certain adhesiveness; it can play at least one or more roles such as leakage prevention, waterproofing, vibration prevention, and sound insulation.

[0003] Chinese Patent Invention 202111335091.0 discloses a flame-retardant and fireproof sealant and a preparation method thereof; it contains the following raw material components in parts by weight, 80-100 parts of polydimethylsiloxane; 5-10 parts of crosslinking agent; 0.5-2 parts of catalyst; 3-6 parts of dispersant; 1-10 parts of plasticizer; 1-5 parts of flame retardant; the flame retardant is composed of zinc borate and anhydrous magnesium carbonate. In the process of preparing the flame-retardant and fireproof sealant with polydimethylsiloxane as the raw material, by adding a flame retardant composed of zinc borate and anhydrous magnesium carbonate, a certain fireproof and flame-retardant effect can be achieved with only a small amount of flame retardant added.

[0004] The inventor further found in the research that the waterproof and conductive functions of the sealant prepared with polydimethylsiloxane as the raw material according to the method described in Chinese Patent Invention 202111335091.0 need to be further improved; thus, its application field can be further broadened. Summary of the Invention

[0005] In order to overcome at least one of the technical problems existing in the prior art, the present invention first provides a flame-retardant and fireproof sealant.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] A graphene glue with a waterproof function, which contains the following raw material components in parts by weight:

[0008] 50-70 parts of polydimethylsiloxane; 4-8 parts of crosslinking agent; 0.5-1 part of catalyst; 1-3 parts of dispersant; 1-5 parts of plasticizer; 10-15 parts of waterproof agent; 5-10 parts of graphene.

[0009] In the process of preparing the glue with polydimethylsiloxane as the raw material, the present invention adds a waterproof agent to improve the waterproof performance of the prepared glue; in addition, graphene is also added to improve the conductive performance of the prepared glue; so that the prepared glue has both a waterproof function and a conductive function.

[0010] Preferably, the graphene glue with waterproof function comprises the following raw material components in parts by weight:

[0011] 60 - 70 parts of polydimethylsiloxane; 5 - 6 parts of crosslinking agent; 0.5 - 1 part of catalyst; 1 - 2 parts of dispersant; 1 - 3 parts of plasticizer; 10 - 12 parts of waterproof agent; 5 - 8 parts of graphene.

[0012] Preferably, the graphene glue with waterproof function comprises the following raw material components in parts by weight:

[0013] 60 parts of polydimethylsiloxane; 5 parts of crosslinking agent; 1 part of catalyst; 2 parts of dispersant; 2 parts of plasticizer; 12 parts of waterproof agent; 8 parts of graphene.

[0014] Preferably, the waterproof agent is calcium silicate powder.

[0015] More preferably, the waterproof agent is modified calcium silicate powder.

[0016] Preferably, the modified calcium silicate powder is prepared by the following method:

[0017] (1) Take calcium silicate powder, add it into water, and stir evenly to obtain a calcium silicate powder dispersion;

[0018] (2) Add a modifier to the calcium silicate powder dispersion and continue stirring for 1 - 2 h to obtain a modified solution;

[0019] (3) Perform solid - liquid separation on the modified solution, and take the solid and dry it to obtain the modified calcium silicate powder.

[0020] The inventor found in the research that in the process of preparing glue with polydimethylsiloxane as the raw material, although adding calcium silicate powder as the waterproof agent can improve the waterproof performance of the prepared glue; however, the inventor found in the research that the tear strength of the glue prepared after adding calcium silicate powder will decrease.

[0021] To overcome this problem, the inventor surprisingly found in a large number of experiments that in the process of preparing glue with polydimethylsiloxane as the raw material, by adding the modified calcium silicate powder prepared by the above - mentioned modification method, compared with adding unmodified calcium silicate powder, the tear strength of the prepared glue can be significantly improved.

[0022] Preferably, the weight of water used in step (1) is 5 - 10 times the weight of calcium silicate powder;

[0023] Most preferably, the weight of water used in step (1) is 8 times the weight of calcium silicate powder.

[0024] Preferably, the added weight of the modifier in step (2) is 4 - 6% of the weight of the calcium silicate powder dispersion.

[0025] Most preferably, the added weight of the modifier in step (2) is 5% of the weight of the calcium silicate powder dispersion.

[0026] Preferably, the modifier described in step (2) is sodium perfluorodecene p-oxybenzenesulfonate.

[0027] The inventors found in the research that the selection of the modifier plays a decisive role in whether the prepared modified calcium silicate powder can significantly improve the tear strength of the glue. The inventors surprisingly found in a large number of experiments that in the process of preparing glue with polydimethylsiloxane as the raw material, by adding the modified calcium silicate powder modified with sodium perfluorodecene p-oxybenzenesulfonate, the tear strength of the prepared glue can be significantly improved compared with adding unmodified calcium silicate powder; however, by adding the modified calcium silicate powder modified with other modifiers, the tear strength of the prepared glue cannot be significantly improved.

[0028] More preferably, the modifier described in step (2) is composed of sodium perfluorodecene p-oxybenzenesulfonate and coconut oil acid diethanolamide.

[0029] The inventors surprisingly found in further research that in the process of preparing glue with polydimethylsiloxane as the raw material, by adding the modified calcium silicate powder modified with the modifier composed of sodium perfluorodecene p-oxybenzenesulfonate and coconut oil acid diethanolamide, the tear strength of the prepared glue can be further significantly improved; the degree of improvement in the tear strength of the prepared glue is significantly higher than that of the modified calcium silicate powder modified with a single sodium perfluorodecene p-oxybenzenesulfonate modifier or a single coconut oil acid diethanolamide modifier. The modified calcium silicate powder modified with the modifier composed of sodium perfluorodecene p-oxybenzenesulfonate and coconut oil acid diethanolamide can synergistically improve the tear strength of the prepared glue.

[0030] More preferably, the weight ratio of sodium perfluorodecene p-oxybenzenesulfonate to coconut oil acid diethanolamide is 2 - 4:1;

[0031] Most preferably, the weight ratio of sodium perfluorodecene p-oxybenzenesulfonate to coconut oil acid diethanolamide is 3:1.

[0032] The present invention also provides a preparation method of the above graphene glue with a waterproof effect, which comprises the following steps:

[0033] First, put polydimethylsiloxane, dispersant, waterproof agent and graphene into a high-speed blender, and stir for 10 - 30 minutes under a vacuum degree of -0.05 to -0.08 Mpa; then add crosslinking agent and catalyst, and stir for 100 - 200 minutes under a vacuum degree of -0.08 to -0.1 Mpa. Finally, add plasticizer and continue to stir for 20 - 40 minutes under a vacuum degree of -0.08 to -0.1 Mpa to obtain the flame-retardant and fireproof sealant.

[0034] Beneficial effects: The present invention provides a brand-new graphene glue with waterproof function. In the process of preparing glue with polydimethylsiloxane as the raw material, by adding waterproof agent, the waterproof performance of the prepared glue is improved; in addition, by adding graphene, the electrical conductivity of the prepared glue is improved, making the prepared glue have both waterproof and electrical conductivity functions. Further, in the process of preparing glue with polydimethylsiloxane as the raw material, by adding modified calcium silicate powder modified with perfluorodecene sodium p-toluenesulfonate, compared with adding unmodified calcium silicate powder, the tear strength of the prepared glue can be greatly improved. Specific embodiments

[0035] The following specific embodiments are used to further explain the present invention, but the embodiments do not limit the present invention in any form.

[0036] In the following embodiments, the polydimethylsiloxane used is polydimethylsiloxane with a viscosity (25°C cp) of 5000; the crosslinking agent is selected from methyltributanoneoxime silane; the catalyst is selected from dibutyltin dilaurate; the plasticizer is selected from liquid polybutadiene; the dispersant is selected from calcium stearate. The raw materials in the embodiments are all conventional raw materials that those skilled in the art can obtain through purchase.

[0037] Example 1 Preparation of graphene glue with waterproof function

[0038] Composition of raw materials by weight: 60 parts of polydimethylsiloxane; 5 parts of crosslinking agent; 1 part of catalyst; 2 parts of dispersant; 2 parts of plasticizer; 12 parts of calcium silicate powder; 8 parts of graphene.

[0039] Preparation method: First, put polydimethylsiloxane, dispersant, calcium silicate powder and graphene into a high-speed blender, and stir for 20 minutes under a vacuum degree of -0.06 Mpa; then add crosslinking agent and catalyst, and stir for 120 minutes under a vacuum degree of -0.08 Mpa. Finally, add plasticizer and continue to stir for 30 minutes under a vacuum degree of -0.08 Mpa to obtain graphene glue with waterproof function.

[0040] Example 2 Preparation of graphene glue with waterproof function

[0041] The composition of raw materials by weight parts: 60 parts of polydimethylsiloxane; 5 parts of crosslinking agent; 1 part of catalyst; 2 parts of dispersant; 2 parts of plasticizer; 12 parts of modified calcium silicate powder; 8 parts of graphene.

[0042] The said modified calcium silicate powder is prepared by the following method:

[0043] (1) Take calcium silicate powder, add water with a weight 8 times that of the calcium silicate powder, and stir evenly to obtain a calcium silicate powder dispersion;

[0044] (2) Add a modifier to the calcium silicate powder dispersion and continue stirring for 1.5 h to obtain a modified solution;

[0045] (3) Perform solid-liquid separation on the modified solution, and take the solid and dry it to obtain the said modified calcium silicate powder;

[0046] In step (2), the added weight of the modifier is 5% of the weight of the calcium silicate powder dispersion; the said modifier is sodium perfluorodecene p-oxybenzenesulfonate.

[0047] Preparation method: First, put polydimethylsiloxane, dispersant, modified calcium silicate powder and graphene into a high-speed mixer, and stir for 20 min under a vacuum degree of -0.06 Mpa; then add the crosslinking agent and catalyst, and stir for 120 min under a vacuum degree of -0.08 Mpa, and finally add the plasticizer and continue stirring for 30 min under a vacuum degree of -0.08 Mpa to obtain the graphene glue with waterproof function.

[0048] Preparation of the graphene glue with waterproof function in Example 3

[0049] The composition of raw materials by weight parts: 50 parts of polydimethylsiloxane; 4 parts of crosslinking agent; 0.5 part of catalyst; 1 part of dispersant; 1 part of plasticizer; 15 parts of modified calcium silicate powder; 5 parts of graphene.

[0050] The said modified calcium silicate powder is prepared by the following method:

[0051] (1) Take calcium silicate powder, add water with a weight 5 times that of the calcium silicate powder, and stir evenly to obtain a calcium silicate powder dispersion;

[0052] (2) Add a modifier to the calcium silicate powder dispersion and continue stirring for 1 h to obtain a modified solution;

[0053] (3) Perform solid-liquid separation on the modified solution, and take the solid and dry it to obtain the said modified calcium silicate powder;

[0054] In step (2), the added weight of the modifier is 4% of the weight of the calcium silicate powder dispersion; the said modifier is sodium perfluorodecene p-oxybenzenesulfonate.

[0055] Preparation method: First, put polydimethylsiloxane, dispersant, modified calcium silicate powder and graphene into a high-speed mixer, and stir for 20 min under a vacuum degree of -0.06 Mpa; then add a cross-linking agent and a catalyst, and stir for 120 min under a vacuum degree of -0.08 Mpa. Finally, add a plasticizer and continue to stir for 30 min under a vacuum degree of -0.08 Mpa to obtain the graphene glue with waterproof function.

[0056] Preparation of Graphene Glue with Waterproof Function in Example 4

[0057] Composition by weight of raw materials: 70 parts of polydimethylsiloxane; 8 parts of cross-linking agent; 1 part of catalyst; 3 parts of dispersant; 5 parts of plasticizer; 10 parts of modified calcium silicate powder; 10 parts of graphene.

[0058] The modified calcium silicate powder is prepared by the following method:

[0059] (1) Take calcium silicate powder, add 10 times the weight of water, and stir evenly to obtain a calcium silicate powder dispersion;

[0060] (2) Add a modifier to the calcium silicate powder dispersion and continue to stir for 2 h to obtain a modified liquid;

[0061] (3) Perform solid-liquid separation on the modified liquid, and take the solid and dry it to obtain the modified calcium silicate powder;

[0062] In step (2), the added weight of the modifier is 6% of the weight of the calcium silicate powder dispersion; the modifier is sodium perfluorodecene p-oxybenzenesulfonate.

[0063] Preparation method: First, put polydimethylsiloxane, dispersant, modified calcium silicate powder and graphene into a high-speed mixer, and stir for 20 min under a vacuum degree of -0.06 Mpa; then add a cross-linking agent and a catalyst, and stir for 120 min under a vacuum degree of -0.08 Mpa. Finally, add a plasticizer and continue to stir for 30 min under a vacuum degree of -0.08 Mpa to obtain the graphene glue with waterproof function.

[0064] Preparation of Graphene Glue with Waterproof Function in Example 5

[0065] Composition by weight of raw materials: 60 parts of polydimethylsiloxane; 5 parts of cross-linking agent; 1 part of catalyst; 2 parts of dispersant; 2 parts of plasticizer; 12 parts of modified calcium silicate powder; 8 parts of graphene.

[0066] The modified calcium silicate powder is prepared by the following method:

[0067] (1) Take calcium silicate powder, add 8 times the weight of water, and stir evenly to obtain a calcium silicate powder dispersion;

[0068] (2) Add a modifier to the calcium silicate powder dispersion and continue stirring for 1.5 h to obtain a modified liquid.

[0069] (3) Perform solid-liquid separation on the modified liquid, and take the solid and dry it to obtain the modified calcium silicate powder.

[0070] In step (2), the added weight of the modifier is 5% of the weight of the calcium silicate powder dispersion; the modifier is composed of perfluorodecene p-oxybenzenesulfonate and coconut fatty acid diethanolamide with a weight ratio of 3:1.

[0071] Preparation method: First, put polydimethylsiloxane, a dispersant, modified calcium silicate powder, and graphene into a high-speed mixer, and stir for 20 min under a vacuum degree of -0.06 Mpa; then add a crosslinking agent and a catalyst, and stir for 120 min under a vacuum degree of -0.08 Mpa. Finally, add a plasticizer and continue stirring for 30 min under a vacuum degree of -0.08 Mpa to obtain the graphene glue with a waterproof effect.

[0072] Preparation of graphene glue with a waterproof effect in Comparative Example 1

[0073] Composition of raw material parts by weight: 60 parts of polydimethylsiloxane; 5 parts of crosslinking agent; 1 part of catalyst; 2 parts of dispersant; 2 parts of plasticizer; 12 parts of modified calcium silicate powder; 8 parts of graphene.

[0074] The modified calcium silicate powder is prepared by the following method:

[0075] (1) Take calcium silicate powder, add 8 times the weight of water, and stir evenly to obtain a calcium silicate powder dispersion.

[0076] (2) Add a modifier to the calcium silicate powder dispersion and continue stirring for 1.5 h to obtain a modified liquid.

[0077] (3) Perform solid-liquid separation on the modified liquid, and take the solid and dry it to obtain the modified calcium silicate powder.

[0078] In step (2), the added weight of the modifier is 5% of the weight of the calcium silicate powder dispersion; the modifier is sodium dodecylbenzenesulfonate.

[0079] Preparation method: First, put polydimethylsiloxane, a dispersant, modified calcium silicate powder, and graphene into a high-speed mixer, and stir for 20 min under a vacuum degree of -0.06 Mpa; then add a crosslinking agent and a catalyst, and stir for 120 min under a vacuum degree of -0.08 Mpa. Finally, add a plasticizer and continue stirring for 30 min under a vacuum degree of -0.08 Mpa to obtain the graphene glue with a waterproof effect.

[0080] The difference between Comparative Example 1 and Example 2 is that the modifier used in Comparative Example 1 is sodium dodecylbenzenesulfonate; while the modifier used in Example 2 is perfluorodecene p-oxybenzenesulfonate.

[0081] Preparation of Graphene Glue with Waterproof Function in Comparative Example 2

[0082] Composition by weight of raw materials: 60 parts of polydimethylsiloxane; 5 parts of crosslinking agent; 1 part of catalyst; 2 parts of dispersant; 2 parts of plasticizer; 12 parts of modified calcium silicate powder; 8 parts of graphene.

[0083] The said modified calcium silicate powder is prepared by the following method:

[0084] (1) Take calcium silicate powder, add 8 times the weight of water, and stir evenly to obtain a calcium silicate powder dispersion;

[0085] (2) Add a modifier to the calcium silicate powder dispersion and continue stirring for 1.5 h to obtain a modified liquid;

[0086] (3) Perform solid-liquid separation on the modified liquid, and take the solid and dry it to obtain the said modified calcium silicate powder;

[0087] In step (2), the added weight of the modifier is 5% of the weight of the calcium silicate powder dispersion; the said modifier is sodium lignosulfonate.

[0088] Preparation method: First, put polydimethylsiloxane, dispersant, modified calcium silicate powder and graphene into a high-speed mixer, and stir for 20 min under a vacuum degree of -0.06 Mpa; then add the crosslinking agent and catalyst, and stir for 120 min under a vacuum degree of -0.08 Mpa, and finally add the plasticizer and continue stirring for 30 min under a vacuum degree of -0.08 Mpa to obtain graphene glue with waterproof function.

[0089] The difference between Comparative Example 2 and Example 2 is that the modifier used in Comparative Example 2 is sodium lignosulfonate; while the modifier used in Example 2 is perfluorodecene p-oxybenzenesulfonate.

[0090] Preparation of Graphene Glue with Waterproof Function in Comparative Example 3

[0091] Composition by weight of raw materials: 60 parts of polydimethylsiloxane; 5 parts of crosslinking agent; 1 part of catalyst; 2 parts of dispersant; 2 parts of plasticizer; 12 parts of modified calcium silicate powder; 8 parts of graphene.

[0092] The said modified calcium silicate powder is prepared by the following method:

[0093] (1) Take calcium silicate powder, add 8 times the weight of water, and stir evenly to obtain a calcium silicate powder dispersion;

[0094] (2) Add a modifier to the calcium silicate powder dispersion and continue stirring for 1.5 h to obtain a modified liquid.

[0095] (3) Perform solid-liquid separation on the modified liquid, and take the solid and dry it to obtain the modified calcium silicate powder.

[0096] In step (2), the added weight of the modifier is 5% of the weight of the calcium silicate powder dispersion; the modifier is coconut fatty acid diethanolamide.

[0097] Preparation method: First, put polydimethylsiloxane, a dispersant, modified calcium silicate powder, and graphene into a high-speed mixer, and stir for 20 min under a vacuum degree of -0.06 Mpa; then add a crosslinking agent and a catalyst, and stir for 120 min under a vacuum degree of -0.08 Mpa. Finally, add a plasticizer and continue stirring for 30 min under a vacuum degree of -0.08 Mpa to obtain the graphene glue with a waterproof effect.

[0098] The difference between Comparative Example 3 and Example 2 is that in Comparative Example 3, the modifier used is coconut fatty acid diethanolamide; while in Example 2, the modifier used is perfluorodecene p-oxybenzenesulfonate.

[0099] Preparation of graphene glue with a waterproof effect in Comparative Example 4

[0100] Composition of raw material parts by weight: 60 parts of polydimethylsiloxane; 5 parts of crosslinking agent; 1 part of catalyst; 2 parts of dispersant; 2 parts of plasticizer; 12 parts of modified calcium silicate powder; 8 parts of graphene.

[0101] The modified calcium silicate powder is prepared by the following method:

[0102] (1) Take calcium silicate powder, add water with a weight 8 times that of the calcium silicate powder, and stir evenly to obtain a calcium silicate powder dispersion.

[0103] (2) Add a modifier to the calcium silicate powder dispersion and continue stirring for 1.5 h to obtain a modified liquid.

[0104] (3) Perform solid-liquid separation on the modified liquid, and take the solid and dry it to obtain the modified calcium silicate powder.

[0105] In step (2), the added weight of the modifier is 5% of the weight of the calcium silicate powder dispersion; the modifier is composed of perfluorodecene p-oxybenzenesulfonate and sodium dodecylbenzenesulfonate with a weight ratio of 3:1.

[0106] Preparation method: First, put polydimethylsiloxane, dispersant, modified calcium silicate powder and graphene into a high-speed mixer, and stir for 20 min under a vacuum degree of -0.06 Mpa; then add a cross-linking agent and a catalyst, stir for 120 min under a vacuum degree of -0.08 Mpa, and finally add a plasticizer and continue to stir for 30 min under a vacuum degree of -0.08 Mpa to obtain the graphene glue with waterproof function.

[0107] The difference between Comparative Example 4 and Example 5 is that the modifier used in Comparative Example 4 is composed of perfluorodecene p-oxybenzenesulfonate and sodium dodecylbenzenesulfonate; while the modifier used in Example 5 is composed of perfluorodecene p-oxybenzenesulfonate and coconut fatty acid diethanolamide.

[0108] Preparation of graphene glue with waterproof function in Comparative Example 5

[0109] Composition of raw materials by weight: 60 parts of polydimethylsiloxane; 5 parts of cross-linking agent; 1 part of catalyst; 2 parts of dispersant; 2 parts of plasticizer; 12 parts of modified calcium silicate powder; 8 parts of graphene.

[0110] The said modified calcium silicate powder is prepared by the following method:

[0111] (1) Take calcium silicate powder, add 8 times the weight of water, and stir evenly to obtain a calcium silicate powder dispersion;

[0112] (2) Add a modifier to the calcium silicate powder dispersion and continue to stir for 1.5 h to obtain a modified liquid;

[0113] (3) Perform solid-liquid separation on the modified liquid, and take the solid and dry it to obtain the said modified calcium silicate powder;

[0114] In step (2), the added weight of the modifier is 5% of the weight of the calcium silicate powder dispersion; the said modifier is composed of perfluorodecene p-oxybenzenesulfonate and sodium lignosulfonate with a weight ratio of 3:1.

[0115] Preparation method: First, put polydimethylsiloxane, dispersant, modified calcium silicate powder and graphene into a high-speed mixer, and stir for 20 min under a vacuum degree of -0.06 Mpa; then add a cross-linking agent and a catalyst, stir for 120 min under a vacuum degree of -0.08 Mpa, and finally add a plasticizer and continue to stir for 30 min under a vacuum degree of -0.08 Mpa to obtain the graphene glue with waterproof function.

[0116] The difference between Comparative Example 5 and Example 5 is that the modifier used in Comparative Example 5 is composed of perfluorodecene p-oxybenzenesulfonate and sodium lignosulfonate; while the modifier used in Example 5 is composed of perfluorodecene p-oxybenzenesulfonate and coconut fatty acid diethanolamide.

[0117] The graphene glue with waterproof function prepared in Examples 1-5 and Comparative Examples 1-5 was made into a sample with a thickness of 5 mm; the tear strength of the sample was tested on a tensile machine; and the contact angle of water droplets was tested using a contact angle measuring instrument; the test results are shown in Table 1.

[0118] Table 1.

[0119] Tear strength Contact angle Graphene glue with waterproof function prepared in Example 1 17 Mpa 131.5° Graphene glue with waterproof function prepared in Example 2 30 Mpa 129.2° Graphene glue with waterproof function prepared in Example 3 26 Mpa 124.1° Graphene glue with waterproof function prepared in Example 4 27 Mpa 125.4° Graphene glue with waterproof function prepared in Example 5 41 Mpa 133.6° Graphene glue with waterproof function prepared in Comparative Example 1 19 Mpa 121.3° Graphene glue with waterproof function prepared in Comparative Example 2 18 Mpa 124.7° Graphene glue with waterproof function prepared in Comparative Example 3 20 Mpa 127.1° Graphene glue with waterproof function prepared in Comparative Example 4 24 Mpa 125.9° Graphene glue with waterproof function prepared in Comparative Example 5 25 Mpa 125.2°

[0120] It can be seen from the experimental data in Table 1 that the tear strength of the graphene glue with waterproof function prepared in Examples 2-4 is much higher than that of the graphene glue with waterproof function prepared in Example 1. This shows that: in the process of preparing glue with polydimethylsiloxane as the raw material, the modified calcium silicate powder prepared by adding the modification method of the present invention can greatly improve the tear strength of the prepared glue.

[0121] It can be seen from the experimental data in Table 1 that the increase in the tear strength of the graphene glue with waterproof function prepared in Comparative Examples 1-3 is not significant compared with that in Example 1, and the increase is much smaller than that in Example 2. This shows that the choice of modifier plays a decisive role in whether the modified calcium silicate powder prepared can greatly improve the tear strength of the glue. In the process of preparing glue with polydimethylsiloxane as the raw material, only by adding the modified calcium silicate powder modified with sodium p-perfluorodecene benzene sulfonate can the tear strength of the prepared glue be greatly improved; however, by adding the modified calcium silicate powder modified with other modifiers, the tear strength of the prepared glue cannot be greatly improved.

[0122] It can be seen from the experimental data in Table 1 that the tear strength of the graphene glue with waterproof function prepared in Example 5 is further much higher than that of the graphene glue with waterproof function prepared in Example 2. This shows that: in the process of preparing glue with polydimethylsiloxane as the raw material, by adding the modified calcium silicate powder modified with a modifier composed of sodium p-perfluorodecene benzene sulfonate and coconut oil acid diethanolamide, it can further greatly improve the tear strength of the prepared glue.

[0123] It can also be seen from the experimental data in Table 1 that the tear strength of the graphene glue with waterproof function prepared in Example 5 is also much higher than that of the graphene glue with waterproof function prepared in Comparative Example 3. Thus, it can be seen that in the process of preparing glue with polydimethylsiloxane as the raw material, by adding modified calcium silicate powder modified with a modifier composed of sodium perfluorodecene sulfonate and coconut diethanolamide, the degree of improvement in the tear strength of the prepared glue is significantly or much higher than that of the modified calcium silicate powder modified with a single sodium perfluorodecene sulfonate modifier or a single coconut diethanolamide modifier. This shows that the modified calcium silicate powder modified with a modifier composed of sodium perfluorodecene sulfonate and coconut diethanolamide can synergistically improve the tear strength of the prepared glue.

[0124] It can be seen from the experimental data in Table 1 that the tear strength of the graphene glue with waterproof function prepared in Comparative Examples 4 and 5 is not higher than that of the graphene glue with waterproof function prepared in Example 2. This shows that: in the process of preparing glue with polydimethylsiloxane as the raw material, only by adding modified calcium silicate powder modified with a combined modifier composed of sodium perfluorodecene sulfonate and coconut diethanolamide can the tear strength of the prepared glue be further significantly improved; while adding modified calcium silicate powder modified with a combined modifier composed of sodium perfluorodecene sulfonate and other modifiers cannot further significantly improve the tear strength of the prepared glue. The above comparative experiments also show that only the modified calcium silicate powder modified with a combined modifier composed of sodium perfluorodecene sulfonate and coconut diethanolamide can synergistically improve the tear strength of the prepared glue; however, the modified calcium silicate powder modified with a combined modifier composed of sodium perfluorodecene sulfonate and other modifiers cannot synergistically improve the tear strength of the prepared glue.

[0125] In addition, it can be seen from the experimental data in Table 1 that the contact angles of the graphene glue with waterproof function prepared in Examples 1 to 5 with water droplets are all greater than 120°; this shows that the graphene glue with waterproof function described in the present invention has good waterproof function.

[0126] In summary, the graphene glue with waterproof function described in the present invention not only has good waterproof function, but also has good tear strength.

Claims

1. A graphene glue with a waterproof function, characterized in that, The raw material components include the following parts by weight: Polydimethylsiloxane 50 - 70 parts; crosslinking agent 4 - 8 parts; catalyst 0.5 - 1 part; dispersant 1 - 3 parts; plasticizer 1 - 5 parts; waterproofing agent 10 - 15 parts; graphene 5 - 10 parts; The waterproofing agent is modified calcium silicate powder; the modified calcium silicate powder is prepared by the following method: (1) Take calcium silicate powder, add it to water, and stir evenly to obtain a calcium silicate powder dispersion; (2) Add a modifier to the calcium silicate powder dispersion and continue stirring for 1 - 2 h to obtain a modified liquid; (3) Perform solid - liquid separation on the modified liquid, and take the solid and dry it to obtain the modified calcium silicate powder; The modifier in step (2) is sodium perfluorodecene p - oxybenzenesulfonate.

2. The graphene glue with waterproof function according to claim 1, wherein, The raw material components include the following parts by weight: Polydimethylsiloxane 60 - 70 parts; crosslinking agent 5 - 6 parts; catalyst 0.5 - 1 part; dispersant 1 - 2 parts; plasticizer 1 - 3 parts; waterproofing agent 10 - 12 parts; graphene 5 - 8 parts.

3. The graphene glue with waterproof function according to claim 1, characterized in that, The raw material components include the following parts by weight: Polydimethylsiloxane 60 parts; crosslinking agent 5 parts; catalyst 1 part; dispersant 2 parts; plasticizer 2 parts; waterproofing agent 12 parts; graphene 8 parts.

4. The graphene glue with waterproof function according to claim 1, characterized in that, In step (1), the weight of water used is 5 - 10 times the weight of calcium silicate powder.

5. The graphene glue with a waterproof function according to claim 1, characterized in that, In step (1), the weight of water used is 8 times the weight of calcium silicate powder.

6. The graphene glue with waterproof function according to claim 1, characterized in that, In step (2), the added weight of the modifier is 4 - 6% of the weight of the calcium silicate powder dispersion.

7. The graphene glue with waterproof function according to claim 6, characterized in that, In step (2), the added weight of the modifier is 5% of the weight of the calcium silicate powder dispersion.

8. The preparation method of the graphene glue with waterproof function according to any one of claims 1 to 7, characterized in that, It includes the following steps: First, put polydimethylsiloxane, dispersant, waterproofing agent and graphene into a high - speed mixer, and stir at a vacuum degree of - 0.05 to - 0.08 Mpa for 10 - 30 min; then add the crosslinking agent and catalyst, and stir at a vacuum degree of - 0.08 to - 0.1 Mpa for 100 - 200 min, and finally add the plasticizer and continue stirring at a vacuum degree of - 0.08 to - 0.1 Mpa for 20 - 40 min to obtain the graphene glue with waterproof function.