Bi-component organic silicon adhesive for intelligent water meter and preparation method of bi-component organic silicon adhesive

Abstract

The invention discloses a double-component organic silicon adhesive for an intelligent water meter, which comprises the following raw materials in parts by weight: a component A: 80-120 parts of alpha-omega-dihydroxy polydimethylsiloxane and 10-30 parts of modified precipitated silicon dioxide powder; the component B is prepared from the following components in parts by weight: 5 to 8 parts of ethyl orthosilicate, 0.05 to 0.1 part of dibutyltin dilaurate and 2 to 5 parts of branched chain amino silane oligomer; the invention also discloses a preparation method of the bi-component organic silicon adhesive for the intelligent water meter, which comprises the following steps: (1) mixing alpha-omega-dihydroxy polydimethylsiloxane and modified precipitated silicon dioxide powder, and uniformly stirring to obtain a component A; (2) mixing tetraethoxysilane, dibutyltin dilaurate and a branched chain amino silane oligomer, and uniformly stirring to obtain a component B; and (3) mixing the component A and the component B, and uniformly stirring to obtain the bi-component organic silicon adhesive for the intelligent water meter. The bi-component organic silicon adhesive for the intelligent water meter can be rapidly and deeply cured at normal temperature, and has good moisture-proof and moisture-proof effects.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesives, and in particular to a two-component organic silicone adhesive for smart water meters and a preparation method thereof. Background Art

[0002] Smart water meter is a new type of water meter that uses modern microelectronics technology, modern sensor technology, and smart IC card technology to measure water consumption and transmit water consumption data and settle transactions. Compared with traditional water meters that generally only have the functions of flow collection and mechanical pointer display of water consumption, it is a great improvement. In addition to recording and electronically displaying water consumption, smart water meters can also control water consumption according to agreements, and automatically complete the calculation of water charges for tiered water prices, and can also store water consumption data. Since electronic components are used in smart water meters, and smart water meters need to work in a humid environment for a long time and contact water, in order to protect electronic components that are susceptible to moisture or contact with water, packaging adhesives are needed to bond and seal smart water meters. At present, most of the existing packaging glues for smart water meters are single-component packaging glues. This type of packaging glue has a slow curing rate when used, cannot be deeply cured, and has poor water vapor barrier properties in high and low temperature environments. Summary of the invention

[0003] In view of this, the present invention provides a two-component organic silicone adhesive for a smart water meter and a preparation method thereof to solve the above-mentioned problems.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A two-component organic silicone adhesive for smart water meters, the raw materials are calculated by weight and include:

[0006] Component A

[0007] 80-120 parts of α-ω-dihydroxy polydimethylsiloxane;

[0008] 10-30 parts of modified precipitated silica powder;

[0009] Component B

[0010] 5-8 parts of tetraethyl orthosilicate;

[0011] Dibutyltin dilaurate 0.05-0.1 part;

[0012] 2 to 5 parts of branched aminosilane oligomer.

[0013] Furthermore, the modifier for modifying the precipitated silica powder in the component A is hexamethyldisilazane.

[0014] Furthermore, the modification method of the modified precipitated silica powder in component A comprises the following steps:

[0015] The precipitated silica powder is added into hexamethyldisilazane, heated and stirred for modification, filtered, washed and dried to obtain modified precipitated silica powder.

[0016] Furthermore, the mass ratio of the precipitated silica powder to the hexamethyldisilazane is 1:12-15.

[0017] Furthermore, the heating and stirring modification time is 4 to 6 hours, and the temperature is 80 to 100°C.

[0018] Furthermore, the preparation method of the branched aminosilane oligomer in the B component comprises the following steps:

[0019] (1) Weigh 180-220 parts of amino silicone oil, 8-12 parts of hexamethyldisilazane, and 18-22 parts of tetramethylammonium hydroxide solution respectively by weight;

[0020] (2) adding amino silicone oil and hexamethyldisilazane into a reaction vessel, heating and stirring to obtain a mixed solution;

[0021] (3) Slowly drop a tetramethylammonium hydroxide solution into the mixed solution, heat to 140-160° C. and stir at a constant temperature for 4-8 hours, then cool to 110-130° C., remove low-boiling substances by vacuum distillation, and cool at room temperature to obtain a branched aminosilane oligomer.

[0022] Furthermore, the mass fraction of the tetramethylammonium hydroxide solution in step (1) is 10% to 25%.

[0023] Furthermore, the vacuum degree of the reduced pressure distillation in step (3) is 0.085-0.095 MPa.

[0024] Furthermore, the preparation method of the two-component organic silicone adhesive for the smart water meter comprises the following preparation steps:

[0025] (1) Mixing α-ω-dihydroxypolydimethylsiloxane and modified precipitated silica powder according to the formula amount and stirring them uniformly to obtain component A;

[0026] (2) mixing ethyl orthosilicate, dibutyltin dilaurate, and branched aminosilane oligomer according to the formula amount and stirring evenly to obtain component B;

[0027] (3) The component A and the component B prepared above are mixed in a mass ratio of 10:0.7-1 and stirred evenly to obtain a two-component organic silicone adhesive for a smart water meter.

[0028] Furthermore, in step (3), the mass ratio of component A to component B is 10:0.7-1.

[0029] The beneficial effects of the present invention are:

[0030] The two-component organic silicone adhesive for smart water meters of the present invention can be rapidly and deeply cured at room temperature, and still maintains basic properties under high temperature and high humidity environments, and has good moisture and humidity resistance effects. The present invention also adds modified precipitated silica powder to the system, and uses hexamethyldisilazane to perform surface modification on the precipitated silica. The hexamethyldisilazane reacts with the hydroxyl groups on the surface of the precipitated silica to form silicon-oxygen bonds, thereby improving the surface properties of the silica. The modified precipitated silica powder has a reduced number of surface hydroxyl groups, improved hydrophobicity, and can be evenly dispersed in the system to further improve the moisture and humidity resistance effects. DETAILED DESCRIPTION

[0031] The preparation method of the two-component organic silicone adhesive for smart water meters of the present invention comprises the following steps:

[0032] (1) Precipitated silica powder is added to hexamethyldisilazane at a mass ratio of 1:12-15, and the mixture is heated and stirred at a temperature of 80-100° C. for 4-6 hours for modification. The mixture is filtered, washed, and dried to obtain modified precipitated silica powder.

[0033] (2) Weigh, by weight, 180 to 220 parts of amino silicone oil, 8 to 12 parts of hexamethyldisilazane, and 18 to 22 parts of 10% to 25% tetramethylammonium hydroxide solution;

[0034] (3) adding amino silicone oil and hexamethyldisilazane into a reaction vessel, heating and stirring to obtain a mixed solution;

[0035] (4) Slowly add tetramethylammonium hydroxide solution dropwise to the mixture and heat to

[0036] The mixture is stirred at 140-160°C for 4-8 hours, then cooled to 110-130°C, and low-boiling substances are removed by reduced pressure distillation at a vacuum degree of 0.085-0.095 MPa. The mixture is cooled at room temperature to obtain a branched aminosilane oligomer.

[0037] (5) Weigh 80 to 120 parts of α-ω-dihydroxy polydimethylsiloxane and 10 to 30 parts of modified precipitated silica powder respectively by weight, mix the α-ω-dihydroxy polydimethylsiloxane and the modified precipitated silica powder and stir them evenly to obtain component A;

[0038] (6) Weigh 5 to 8 parts of ethyl orthosilicate, 0.05 to 0.1 parts of dibutyltin dilaurate, and 2 to 5 parts of branched aminosilane oligomer respectively by weight, mix the ethyl orthosilicate, dibutyltin dilaurate, and branched aminosilane oligomer, and stir them evenly to obtain component B;

[0039] (7) The component A and the component B prepared above are mixed in a mass ratio of 10:0.7-1 and stirred evenly to obtain a two-component organic silicone adhesive for a smart water meter.

[0040] Example 1

[0041] The two-component organic silicone adhesive for smart water meters of this embodiment and the preparation method thereof include the following steps:

[0042] (1) Precipitated silica powder is added to hexamethyldisilazane at a mass ratio of 1:12, and the mixture is heated and stirred at a temperature of 80 to 100° C. for 4 hours for modification. The mixture is filtered, washed, and dried to obtain modified precipitated silica powder.

[0043] (2) Weigh 180 parts of amino silicone oil, 8 parts of hexamethyldisilazane, and 18 parts of 10% tetramethylammonium hydroxide solution respectively by weight;

[0044] (3) adding amino silicone oil and hexamethyldisilazane into a reaction vessel, heating and stirring to obtain a mixed solution;

[0045] (4) Slowly drop a tetramethylammonium hydroxide solution into the mixed solution, heat to 140° C. and stir at a constant temperature for 4 h, then cool to 110° C., remove low-boiling substances by reduced pressure distillation at a vacuum degree of 0.085 MPa, and cool at room temperature to obtain a branched aminosilane oligomer.

[0046] (5) Weigh 80 parts of α-ω-dihydroxypolydimethylsiloxane and 10 parts of modified precipitated silica powder respectively by weight, mix the α-ω-dihydroxypolydimethylsiloxane and the modified precipitated silica powder and stir them evenly to obtain component A;

[0047] (6) Weigh 5 parts of ethyl orthosilicate, 0.05 parts of dibutyltin dilaurate, and 2 parts of branched aminosilane oligomer respectively by weight, mix the ethyl orthosilicate, dibutyltin dilaurate, and branched aminosilane oligomer, and stir them evenly to obtain component B;

[0048] (7) The component A and the component B prepared above were mixed in a mass ratio of 10:0.7 and stirred evenly to obtain a two-component silicone adhesive for a smart water meter.

[0049] Example 2

[0050] The two-component organic silicone adhesive for smart water meters of this embodiment and the preparation method thereof include the following steps:

[0051] (1) Precipitated silica powder was added to hexamethyldisilazane at a mass ratio of 1:13, heated and stirred at 85° C. for 4.5 h, filtered, washed, and dried to obtain modified precipitated silica powder.

[0052] (2) Weigh 190 parts of amino silicone oil, 9 parts of hexamethyldisilazane, and 19 parts of 15% tetramethylammonium hydroxide solution respectively by weight;

[0053] (3) adding amino silicone oil and hexamethyldisilazane into a reaction vessel, heating and stirring to obtain a mixed solution;

[0054] (4) Slowly drop a tetramethylammonium hydroxide solution into the mixed solution, heat to 145° C. and stir the mixture at a constant temperature for 5 h, then cool to 115° C., remove low-boiling substances by reduced pressure distillation at a vacuum degree of 0.09 MPa, and cool at room temperature to obtain a branched aminosilane oligomer.

[0055] (5) Weigh 90 parts of α-ω-dihydroxypolydimethylsiloxane and 15 parts of modified precipitated silica powder respectively by weight, mix the α-ω-dihydroxypolydimethylsiloxane and the modified precipitated silica powder and stir them evenly to obtain component A;

[0056] (6) Weighing 6 parts of tetraethyl orthosilicate, 0.07 parts of dibutyltin dilaurate, and 3 parts of branched aminosilane oligomer respectively by weight, mixing the tetraethyl orthosilicate, dibutyltin dilaurate, and branched aminosilane oligomer, and stirring them uniformly to obtain component B;

[0057] (7) The component A and the component B prepared above were mixed in a mass ratio of 10:0.8 and stirred evenly to obtain a two-component organic silicone adhesive for a smart water meter.

[0058] Example 3

[0059] The two-component organic silicone adhesive for smart water meters of this embodiment and the preparation method thereof include the following steps:

[0060] (1) Precipitated silica powder is added to hexamethyldisilazane at a mass ratio of 1:14, heated and stirred at 95° C. for modification for 5 h, filtered, washed, and dried to obtain modified precipitated silica powder.

[0061] (2) Weigh 200 parts of amino silicone oil, 10 parts of hexamethyldisilazane, and 20 parts of 20% tetramethylammonium hydroxide solution by weight respectively;

[0062] (3) adding amino silicone oil and hexamethyldisilazane into a reaction vessel, heating and stirring to obtain a mixed solution;

[0063] (4) Slowly drop a tetramethylammonium hydroxide solution into the mixed solution, heat to 150° C. and stir at a constant temperature for 6 h, then cool to 12° C., remove low-boiling substances by reduced pressure distillation at a vacuum degree of 0.09 MPa, and cool at room temperature to obtain a branched aminosilane oligomer.

[0064] (5) Weighing 110 parts of α-ω-dihydroxypolydimethylsiloxane and 20 parts of modified precipitated silica powder respectively by weight, mixing the α-ω-dihydroxypolydimethylsiloxane and the modified precipitated silica powder and stirring them uniformly to obtain component A;

[0065] (6) Weigh 7 parts of tetraethyl orthosilicate, 0.08 parts of dibutyltin dilaurate, and 4 parts of branched aminosilane oligomer respectively, mix the tetraethyl orthosilicate, dibutyltin dilaurate, and branched aminosilane oligomer, and stir them evenly to obtain component B;

[0066] (7) The component A and the component B prepared above were mixed in a mass ratio of 10:0.9 and stirred evenly to obtain a two-component silicone adhesive for a smart water meter.

[0067] Example 4

[0068] The two-component organic silicone adhesive for smart water meters of this embodiment and the preparation method thereof include the following steps:

[0069] (1) Precipitated silica powder is added to hexamethyldisilazane at a mass ratio of 1:15, and the mixture is heated and stirred at 100° C. for 6 h for modification. The mixture is filtered, washed, and dried to obtain modified precipitated silica powder.

[0070] (2) Weigh 220 parts of amino silicone oil, 12 parts of hexamethyldisilazane, and 22 parts of 25% tetramethylammonium hydroxide solution by weight respectively;

[0071] (3) adding amino silicone oil and hexamethyldisilazane into a reaction vessel, heating and stirring to obtain a mixed solution;

[0072] (4) Slowly drop a tetramethylammonium hydroxide solution into the mixed solution, heat to 160° C. and stir the mixture at a constant temperature for 8 h, then cool to 130° C., remove low-boiling substances by reduced pressure distillation at a vacuum degree of 0.095 MPa, and cool at room temperature to obtain a branched aminosilane oligomer.

[0073] (5) Weigh 120 parts of α-ω-dihydroxypolydimethylsiloxane and 30 parts of modified precipitated silica powder respectively by weight, mix the α-ω-dihydroxypolydimethylsiloxane and the modified precipitated silica powder and stir them evenly to obtain component A;

[0074] (6) Weigh 8 parts of tetraethyl orthosilicate, 0.1 parts of dibutyltin dilaurate, and 5 parts of branched aminosilane oligomer respectively by weight, mix the tetraethyl orthosilicate, dibutyltin dilaurate, and branched aminosilane oligomer, and stir them evenly to obtain component B;

[0075] (7) The component A and the component B prepared above are mixed in a mass ratio of 10:1 and stirred evenly to obtain a two-component organic silicone adhesive for a smart water meter.

[0076] Comparative Example 1

[0077] The two-component organic silicone adhesive for smart water meters in this comparative example and its preparation method are substantially the same as the preparation method in Example 1, except that the precipitated silica powder in component A of this comparative example is not modified.

[0078] Comparative Example 2

[0079] The two-component organic silicone adhesive for smart water meters in this comparative example and its preparation method are substantially the same as the preparation method in Example 1, except that no modified precipitated silica powder is added in this comparative example.

[0080] Experimental example

[0081] The components A and B of the two-component organic silicone adhesive for smart water meters were fully mixed, and the fully mixed glue was pressed with a release film to form a 1mm thick film, which was cured for 7 days at 23±2°C and RH=50±5%, and the water vapor transmission rate was tested according to the test method provided in GB / T26253-2010. The two-component organic silicone adhesive for smart water meters prepared in Examples 1 to 4 and Comparative Examples 1 to 2 were tested according to the above test method, and the specific results are shown in Table 1:

[0082] Table 1: Test results of two-component silicone adhesive for smart water meters

[0083]

[0084]

[0085] The two-component silicone adhesive for smart water meters provided by the present invention has good water-blocking properties, particularly excellent water vapor barrier properties at room temperature, and also quite good water vapor barrier properties at a high temperature of 85°C. It can ensure the long-lasting, efficient and stable operation of smart water meters in high temperature and high humidity environments, and has good application prospects.

[0086] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and additions without departing from the method of the present invention, and these improvements and additions should also be regarded as within the scope of the present invention.

Claims

1. A two-component organic silicone adhesive for smart water meters, characterized in that: The raw materials are calculated by weight and include: Component A 80-120 parts of α-ω-dihydroxy polydimethylsiloxane; 10-30 parts of modified precipitated silica powder; Component B 5-8 parts of tetraethyl orthosilicate; Dibutyltin dilaurate 0.05-0.1 part; 2 to 5 parts of branched aminosilane oligomer.

2. The two-component organic silicone adhesive for smart water meter according to claim 1, characterized in that: The modifier for modifying the precipitated silicon dioxide powder in the component A is hexamethyldisilazane.

3. The two-component organic silicone adhesive for smart water meter according to claim 2, characterized in that: The modification method of the modified precipitated silicon dioxide powder in the A component comprises the following steps: The precipitated silica powder is added into hexamethyldisilazane, heated and stirred for modification, filtered, washed and dried to obtain modified precipitated silica powder.

4. The two-component organic silicone adhesive for smart water meter according to claim 3, characterized in that: The mass ratio of the precipitated silica powder to the hexamethyldisilazane is 1:12-15.

5. The two-component organic silicone adhesive for smart water meter according to claim 3, characterized in that: The heating and stirring modification time is 4 to 6 hours, and the temperature is 80 to 100°C.

6. The two-component organic silicone adhesive for smart water meter according to claim 1, characterized in that: The preparation method of the branched aminosilane oligomer in the B component comprises the following steps: (1) Weigh 180-220 parts of amino silicone oil, 8-12 parts of hexamethyldisilazane, and 18-22 parts of tetramethylammonium hydroxide solution respectively by weight; (2) adding amino silicone oil and hexamethyldisilazane into a reaction vessel, heating and stirring to obtain a mixed solution; (3) Slowly drop a tetramethylammonium hydroxide solution into the mixed solution, heat to 140-160° C. and stir at a constant temperature for 4-8 hours, then cool to 110-130° C., remove low-boiling substances by vacuum distillation, and cool at room temperature to obtain a branched aminosilane oligomer.

7. The two-component organic silicone adhesive for smart water meter according to claim 6, characterized in that: The mass fraction of the tetramethylammonium hydroxide solution in step (1) is 10% to 25%.

8. The two-component organic silicone adhesive for smart water meter according to claim 6, characterized in that: The vacuum degree of the reduced pressure distillation in the step (3) is 0.085-0.095 MPa.

9. A method for preparing a two-component organic silicone adhesive for a smart water meter as claimed in claims 1 to 8, characterized in that: The method comprises the following preparation steps: (1) Mixing α-ω-dihydroxypolydimethylsiloxane and modified precipitated silica powder according to the formula amount and stirring them uniformly to obtain component A; (2) mixing ethyl orthosilicate, dibutyltin dilaurate, and branched aminosilane oligomer according to the formula amount and stirring evenly to obtain component B; (3) The component A and the component B prepared above are mixed and stirred evenly to obtain a two-component organic silicone adhesive for a smart water meter.

10. The method for preparing the two-component organic silicone adhesive for smart water meters according to claim 9, characterized in that: The mass ratio of component A to component B in step (3) is 10:0.7-1.

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