Gasket adhesive and preparation method thereof

Abstract

The present application relates to the field of sealants, and more specifically, it relates to a gasket glue and a preparation method thereof. It is composed of the following raw materials in parts by weight: 2.3-6% initiator, 1-20% polyester acrylate prepolymer, 40-50% polyurethane acrylate, 0.1-0.5% color paste, 1-3% coupling agent, 3-8% silica, and the balance is a diluent; the diluent is composed of the following weight percentages: 20-40% THFA diluent, 1-20% IBOA diluent, 1-20% NVP diluent, and the balance is a HDDA diluent. The present application uses polyester acrylate prepolymer and polyurethane acrylate for compounding, and comprehensively considers the properties of polyester, acrylate resin, and polyurethane, so that the gasket glue has both better mechanical properties, and at the same time has better high temperature and high humidity resistance and low temperature and high humidity resistance, reduces aging, and improves the practicality of the gasket glue. At the same time, the gasket glue also has better chemical corrosion resistance and oil resistance.

Description

Technical Field

[0001] The present application relates to the field of sealants, and more specifically, to a gasket sealant and a preparation method thereof. Background Art

[0002] Sealant refers to a sealing material that deforms with the shape of the sealing surface, is not easy to flow, and has a certain degree of adhesion. It is an adhesive used to fill the gap in the configuration to achieve a sealing effect. It has the functions of preventing leakage, waterproofing, anti-vibration, sound insulation, and heat insulation.

[0003] Gasket glue is a type of sealant. After curing, this glue will not release toxic gas, has no volatiles, and is safe to use. It is widely used in new energy, military, aviation, electronics, automobiles, instruments, high-speed rail and other industries. When using the gasket glue, it is applied to the surface of the connected parts. The gasket formed by curing is located between the nut and the connected parts to protect the surface of the connected parts. Compared with traditional washers, the use of this gasket glue has better connection stability and better sealing effect, reducing the contact between water vapor and screws and avoiding screw corrosion.

[0004] Currently, the main components of gasket glue are polyurethane, silicone rubber, etc. Although silicone rubber gaskets have good high temperature resistance, their wear resistance, elasticity and reproducible molding are inferior to polyurethane gaskets. Therefore, polyurethane gasket glue is often used for screw fixing of communication base stations and thread fixing of cameras.

[0005] However, communication base stations and outdoor cameras are outdoors for a long time, so they will encounter extreme weather during use, such as low temperature and high humidity weather and high temperature and high humidity weather. Since polyurethane is easy to absorb moisture and has poor high temperature resistance, the above extreme weather conditions can easily accelerate the aging of polyurethane gasket glue, causing the gasket to crack, break, etc., thereby reducing the protective effect of the gasket on the connection, which in turn causes the screws to loosen, making the installation of communication base stations and outdoor cameras unstable, and prone to hidden dangers such as collapse and falling. Therefore, further research on gasket glue is needed. Summary of the invention

[0006] In order to obtain a gasket adhesive with better low temperature resistance, high temperature resistance, water resistance, etc., the present application provides a gasket adhesive and a preparation method thereof.

[0007] In a first aspect, the present application provides a gasket adhesive, which is composed of the following raw materials in parts by weight:

[0008] Initiator 2.3-6%

[0009] Polyester acrylate prepolymer 1-20%

[0010] Polyurethane acrylate 40-50%

[0011] Color paste 0.1-0.5%

[0012] Coupling agent 1-3%

[0013] Silicon dioxide 3-8%

[0014] The balance is diluent.

[0015] The raw material dosage range of the above scheme is the best choice for this application, among which the polyester acrylate prepolymer has better yellowing resistance, crack resistance, good adhesion, low viscosity, low shrinkage and high temperature resistance.

[0016] Polyurethane acrylate has the comprehensive advantages of polyurethane, such as flexibility, wear resistance, aging resistance, high tear strength and good weather resistance of acrylate.

[0017] Therefore, the present application uses polyester acrylate prepolymer and polyurethane acrylate as the composite, and then uses initiators, coupling agents, silica, diluents, etc. as the auxiliary, so that the prepared gasket glue has both good mechanical properties such as low shrinkage, wear resistance and elasticity, and also has good low temperature resistance, high temperature resistance and water resistance. Therefore, when the gasket glue of the present application is used for screw fixing of communication base stations and outdoor cameras, it can reduce the possibility of cracking, rupture, and corruption after encountering extreme weather, and improve the protective effect of the gasket glue on the connected parts, thereby improving the installation stability and practicality of communication base stations and outdoor cameras.

[0018] The extreme weather in this application refers to low temperature and high humidity weather. The common low temperature and high humidity weather is "freezing rain", which often occurs in southern my country, especially in Hunan and Hubei. In this weather, it is wet and cold; high temperature and high humidity weather often occurs in summer. Since the temperature resistance of polyurethane gasket glue is usually around 100°C, and the summer temperature in some areas is as high as 40°C or above, and most of the screws are made of metal, which transfers heat quickly and is easy to generate heat. At the same time, they are in a high humidity environment. Therefore, the polyurethane gasket glue is not only prone to aging but also prone to water absorption and corruption under the above extreme weather, which makes the gasket glue easy to break, affecting its protective effect on the connected parts, and then easily causing the screws to loosen, especially for cameras installed in deep forests. When affected by wind, they are easy to loosen and fall off, affecting the practicality of the gasket glue.

[0019] Therefore, the present application adopts polyester acrylate prepolymer and polyurethane acrylate for compounding, and combines the properties of polyester, acrylate resin and polyurethane, so that the gasket glue has better mechanical properties, and at the same time has better resistance to high temperature and high humidity and resistance to low temperature and high humidity, reduces aging, reduces water absorption and corrosion, improves the practicality of the gasket glue, and reduces the possibility of loosening of communication base station screws and camera screws.

[0020] Preferably, the diluent is one or more of THFA diluent, IBOA diluent, NVP diluent and HDDA diluent.

[0021] THFA is the abbreviation of tetrahydrofuran acrylate, which has good adhesion, good dilutability, chemical resistance and water resistance. IBOA diluent is isobornyl acrylate, which has the characteristics of high activity, high boiling point, high hardness, good dilutability, strong adhesion, good gloss, low irritation, excellent water resistance, fast curing speed, and strong adhesion after curing. NVP is the abbreviation of N-vinyl pyrrolidone, and its function is to cross-link with vinyl ether or acrylic acid functional groups to form a diluent with excellent activity in these systems. HDDA is 1,6-hexanediol diacrylate, which has the advantages of low viscosity, strong dilutability, good adhesion, and can improve the flexibility of the cured film.

[0022] When the present application adopts one or more of THFA diluent, IBOA diluent, NVP diluent, and HDDA diluent, and then compounded with polyester acrylate prepolymer and polyurethane acrylate, it plays a better dilution role, and can also further react with unsaturated bonds and hydroxyl groups in the raw material system, so that the obtained gasket glue has better mechanical properties, high temperature and high humidity resistance, and low temperature and high humidity resistance. Reduce the occurrence of aging, low temperature hardening and brittleness. At the same time, the gasket glue also has better chemical corrosion resistance and oil resistance.

[0023] Preferably, the diluent is composed of the following weight percentages:

[0024] THFA diluent 20-40%

[0025] IBOA diluent 1-20%

[0026] NVP diluent 1-20%

[0027] The balance is HDDA diluent.

[0028] The above diluent dosage is the preferred range of this application. When this application uses THFA diluent, IBOA diluent, NVP diluent, and HDDA diluent for compounding, the effect is better than the effect of using one or three of THFA diluent, IBOA diluent, NVP diluent, and HDDA diluent. In addition, the prepared gasket adhesive has better mechanical properties, high temperature and high humidity resistance, and low temperature and high humidity resistance. It reduces the occurrence of aging, water absorption and decay, etc.

[0029] Preferably, the initiator is photoinitiator TPO-L and / or photoinitiator 819.

[0030] The above two initiators both have better initiation effects, so that the obtained gasket adhesive has better mechanical properties, high temperature and high humidity resistance, and low temperature and high humidity resistance.

[0031] Preferably, the initiator comprises 2-5% by weight of initiator TPO-L and 0.3-1% by weight of photoinitiator 819.

[0032] When the initiators are compounded in the above weight percentages, a synergistic effect is achieved to promote initiation, and at the same time, the obtained gasket adhesive has better mechanical properties, high temperature and high humidity resistance, and low temperature and high humidity resistance.

[0033] Preferably, the functionality of the polyester acrylate prepolymer is 3.

[0034] The polyester acrylate prepolymer with a functionality of 3 can be further reacted with polyurethane acrylate, etc., so that the obtained gasket adhesive has better mechanical properties, and at the same time has better resistance to high temperature and humidity and resistance to low temperature and humidity.

[0035] Preferably, the functionality of the polyurethane acrylate is 2.

[0036] The functionality of the polyurethane acrylate is 2, and it can further react with polyester acrylate prepolymers and the like. The obtained gasket adhesive has better mechanical properties, as well as better resistance to high temperature and humidity and resistance to low temperature and humidity.

[0037] Preferably, the polyester acrylate prepolymer is a modified polyester acrylate prepolymer, and the modified polyester acrylate prepolymer is prepared from the following raw materials in parts by weight:

[0038] Polyester acrylate prepolymer 25-38 parts

[0039] 1-3 parts of fluorinated acrylate monomer.

[0040] The modified polyester acrylate prepolymer obtained by blending polyester acrylate prepolymer with fluorine-containing acrylate monomer is used in the gasket adhesive raw material system, so that fluoride ions are introduced into the raw material system, thereby improving the high temperature resistance, cold resistance and water resistance of the gasket adhesive, reducing the possibility of aging, damage, water absorption and corrosion, and improving the practicality of the gasket adhesive. Therefore, when the gasket adhesive is used for screw fixing of communication base stations or screw fixing of outdoor cameras, when encountering extreme weather, the possibility of aging, water absorption, etc. is reduced.

[0041] Preferably, the fluorine-containing acrylic ester monomer is one or more of perfluoropolyether methacrylate, (N-methylperfluorohexylsulfonamide)ethyl acrylate, and dodecafluoroheptyl acrylate.

[0042] Perfluoropolyether methacrylate, (N-methylperfluorohexylsulfonamide)ethyl acrylate, and dodecafluoroheptyl acrylate all contain fluorine elements and have excellent hydrophobicity, high temperature resistance and low temperature resistance. Therefore, when one or more of the fluorinated acrylate monomers are compounded with polyester acrylate prepolymers, the obtained modified polyester acrylate prepolymer is used in the raw material system of gasket glue, and the obtained gasket glue has excellent high temperature and high humidity resistance and low temperature and high humidity resistance.

[0043] The molecular structure of perfluoropolyether methacrylate is:

[0044]

[0045] Preferably, the weight ratio of the perfluoropolyether methacrylate, (N-methylperfluorohexylsulfonamido)ethyl acrylate, and dodecafluoroheptyl acrylate is (3-7):(1-2):1.

[0046] When the weight ratio of fluoropolyether methacrylate, (N-methylperfluorohexylsulfonamide)ethyl acrylate and dodecafluoroheptyl acrylate is (3-7):(1-2):1.

[0047] In a second aspect, a method for preparing a gasket adhesive is prepared by the following method:

[0048] According to the weight percentage, the diluent and the initiator are weighed and stirred to obtain a mixture A; the polyester acrylate prepolymer, the polyurethane acrylate and the color paste are weighed and added to the mixture A, and stirred to obtain a mixture B; the coupling agent is weighed and added to the mixture B, and stirred to obtain a mixture C; the silicon dioxide is weighed and added to the mixture C, and stirred to obtain a gasket glue.

[0049] Preferably, the preparation method of the gasket glue is prepared by the following method:

[0050] Weigh the diluent and the initiator according to weight percentage, stir and mix them evenly, the stirring time is 10-20 minutes, and the stirring speed is 500-800 r / min to obtain a mixture A;

[0051] According to the weight percentage, polyester acrylate prepolymer, polyurethane acrylate and color paste are weighed and added to mixture A, and stirred evenly for 10-20 minutes at a stirring speed of 500-800 r / min, and then the stirring speed is increased to 1000-1500 r / min, and stirred for 20-30 minutes, and it is confirmed that there is no undissolved resin on the bottom and inner wall of the container to obtain mixture B; then the coupling agent is weighed and added to mixture B, and stirred evenly for 3-5 minutes at a stirring speed of 500-800 r / min to obtain mixture C; silicon dioxide is weighed and added to mixture C, and stirred evenly for 3-5 minutes at a stirring speed of 500-800 r / min, and then the speed is increased to 1500-2000 r / min, and the stirring time is 20-30 minutes, and the gasket glue is obtained by testing, filtering, centrifuging and packaging.

[0052] In summary, this application has the following beneficial effects:

[0053] 1. This application uses polyester acrylate prepolymer and polyurethane acrylate for compounding, and combines the properties of polyester, acrylate resin, and polyurethane, so that the gasket glue has both excellent mechanical properties and better resistance to high temperature and high humidity and low temperature and high humidity, reduces aging, reduces water absorption and corrosion, improves the practicality of the gasket glue, and reduces the possibility of loosening of communication base station screws and camera screws.

[0054] 2. The modified polyester acrylate prepolymer obtained by blending polyester acrylate prepolymer with fluorine-containing acrylate monomer is used in the gasket glue raw material system, so that fluoride ions are introduced into the raw material system, thereby improving the high temperature resistance, cold resistance and water resistance of the gasket glue, reducing the possibility of aging, damage, water absorption and corrosion, and improving the practicality of the gasket glue. Therefore, when the gasket glue is used for screw fixing of communication base stations or screw fixing of outdoor cameras, when encountering extreme weather, the possibility of aging, water absorption, etc. is reduced. DETAILED DESCRIPTION

[0055] The present application is further described in detail below with reference to the embodiments.

[0056] Sources of some raw materials:

[0057] Table 1 Sources of some raw materials

[0058]

[0059]

[0060] Example

[0061] Example 1

[0062] A method for preparing a gasket adhesive is prepared by the following method:

[0063] Weigh 33.6 kg of diluent and 2.3 kg of initiator into a stirring device, stir for 10 min at a stirring rate of 600 r / min to obtain a mixture A;

[0064] 10 kg of polyester acrylate prepolymer, 50 kg of polyurethane acrylate and 0.1 kg of color paste were added to mixture A, stirred for 20 min at a stirring rate of 500 r / min, then increased to 1000 r / min, stirred for 30 min, and confirmed that there was no undissolved resin on the bottom and inner wall of the container to obtain mixture B; 1 kg of coupling agent was added to mixture B, stirred for 3 min at a stirring rate of 500 r / min to obtain mixture C; 3 kg of 300-mesh silica was added to mixture C, stirred for 5 min at a stirring rate of 800 r / min, then increased to 1500 r / min, stirred for 20 min to obtain gasket glue.

[0065] The functionality of polyester acrylate prepolymer is 3; the functionality of polyurethane acrylate is 2.

[0066] Embodiment 2-9

[0067] The difference between Example 2-9 and Example 1 is that the amount of raw materials used is different, as shown in Table 2;

[0068] Table 2 Raw material dosage of Examples 1-9 (kg)

[0069]

[0070]

[0071] Example 10

[0072] The difference between Example 10 and Example 8 is that the polyester acrylate prepolymer is a modified polyester acrylate prepolymer, and the modified polyester acrylate prepolymer is obtained by the following method:

[0073] Weigh 25 kg of polyester acrylate prepolymer and 1 kg of fluorinated acrylate monomer into a stirring device and stir evenly for 10 min at a stirring speed of 600 r / min to obtain a modified polyester acrylate prepolymer.

[0074] Wherein, the fluorine-containing acrylate monomer is perfluoropolyether methacrylate.

[0075] Embodiment 11

[0076] The difference between Example 11 and Example 10 is that the polyester acrylate prepolymer is 32 kg and the fluorine-containing acrylate monomer is 2 kg.

[0077] Example 12

[0078] The difference between Example 12 and Example 10 is that the polyester acrylate prepolymer is 38 kg and the fluorine-containing acrylate monomer is 3 kg.

[0079] Embodiment 13

[0080] The difference between Example 13 and Example 11 is that the fluorine-containing acrylate monomer consists of 1.2 kg perfluoropolyether methacrylate, 0.4 kg ethyl acrylate (N-methylperfluorohexylsulfonamide), and 0.4 kg dodecafluoroheptyl acrylate.

[0081] Embodiment 14

[0082] The difference between Example 14 and Example 11 is that the fluorine-containing acrylate monomer consists of 1.25 kg of perfluoropolyether methacrylate, 0.5 kg of (N-methylperfluorohexylsulfonamide)ethyl acrylate, and 0.25 kg of dodecafluoroheptyl acrylate.

[0083] Embodiment 15

[0084] The difference between Example 15 and Example 11 is that the fluorine-containing acrylate monomer consists of 1.4 kg perfluoropolyether methacrylate, 0.4 kg ethyl acrylate (N-methylperfluorohexylsulfonamide), and 0.2 kg dodecafluoroheptyl acrylate.

[0085] Comparative Example

[0086] Comparative Example 1

[0087] The difference between Comparative Example 1 and Example 1 is that the polyester acrylate prepolymer is replaced by polyurethane acrylate in equal amounts.

[0088] Comparative Example 2

[0089] The difference between Comparative Example 2 and Example 1 is that an equal amount of polyurethane acrylate is replaced by polyurethane resin.

[0090] Performance testing

[0091] Detection method / test method

[0092] The gasket adhesive obtained in Examples 1-15 and Comparative Examples 1-2 was placed in a mold, cured under ultraviolet irradiation for 5 minutes, and after demolding, placed in an environment of temperature 30° C. and humidity 60% for 24 hours, the obtained test samples were subjected to the following performance tests;

[0093] Test 1: Test the hardness and elongation at break of the test sample;

[0094] Test 2: Place the test sample in an environment with a humidity of 85% and a temperature of -5°C for 7 days, and then test the hardness and elongation at break;

[0095] Test 3: Place the test sample in an environment with a humidity of 85% and a temperature of 65°C for 7 days, and then test the hardness and elongation at break.

[0096] The above hardness test method refers to GB / T 2411-2008;

[0097] The above-mentioned elongation at break test method is tested in accordance with GB / T 1701-2001;

[0098] The above experiments were tested 5 times, and the average value was taken with 1 decimal place retained. The specific data are shown in Table 3;

[0099] Table 3 Experimental data of Examples 1-15 and Comparative Examples 1-2

[0100]

[0101]

[0102] Combining Example 1 and Comparative Examples 1-2 and Table 3, it can be seen that the moisture absorption rate of Example 1 is lower than that of Comparative Examples 1-2, and after aging, the reduction in hardness and elongation at break of Example 1 is lower than that of Comparative Examples 1-2, indicating that the present application adopts polyester acrylate prepolymer and polyurethane acrylate compound, which has better water resistance, and at the same time has better mechanical properties, low temperature and high humidity resistance, and high temperature and high humidity resistance. The gasket glue thus obtained is used for screw installation of communication base stations or outdoor cameras, etc., and has better stability, reduces aging and damage after extreme weather, and improves its practicality.

[0103] By comparing Example 8 and Examples 10-12, it can be seen that the moisture absorption rates of Examples 10-12 are lower than that of Comparative Example 8, and after aging, the reductions in hardness and elongation at break of Examples 10-12 are lower than those of Example 8, indicating that the modified polyester acrylate prepolymer obtained by adding fluorinated acrylate monomers and blending with polyester acrylate prepolymers is used in gasket glue to further improve water resistance, low temperature and high humidity resistance, and high temperature and high humidity resistance, reduce the possibility of aging and breakage after extreme weather, and improve its practicality.

[0104] By comparing Example 11 and Examples 13-15, it can be seen that the moisture absorption rates of Examples 13-15 are lower than those of Comparative Example 11, and after aging, the reduction in hardness and elongation at break of Examples 13-15 are lower than those of Example 11, indicating that the fluorinated acrylate monomers obtained by perfluoropolyether methacrylate, ethyl acrylate (N-methylperfluorohexylsulfonamide) and dodecafluoroheptyl acrylate play a synergistic role. After being blended with the polyester acrylate prepolymer, the modified polyester acrylate prepolymer obtained is used in the gasket glue to further improve the water resistance, low temperature and high humidity resistance and high temperature and high humidity resistance, reduce the possibility of aging and breakage after extreme weather, and improve its practicality.

[0105] In addition, the gasket glue of the present application has excellent resistance to low temperature and high humidity, high temperature and high humidity, and aging, as well as excellent resistance to chemical corrosion and oil.

[0106] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed. However, as long as it is within the scope of the claims of the present application, it shall be protected by the patent law.

Claims

1. A gasket adhesive, characterized in that: It is composed of the following raw materials in parts by weight: Initiator 2.3-6% Modified polyester acrylate prepolymer 1-20% Polyurethane acrylate 40-50% Color paste 0.1-0.5% Coupling agent 1-3% Silicon dioxide 3-8% The balance is diluent; The diluent is composed of the following weight percentages: THFA diluent 20-40% IBOA diluent 1-20% NVP diluent 1-20% The balance is HDDA diluent; The initiator is photoinitiator TPO-L and / or photoinitiator 819; The modified polyester acrylate prepolymer is prepared from the following raw materials in parts by weight: Polyester acrylate prepolymer 25-38 parts 1-3 parts of fluorinated acrylate monomer; The fluorinated acrylic ester monomer is one or more of perfluoropolyether methacrylate, (N-methylperfluorohexylsulfonamide)ethyl acrylate, and dodecafluoroheptyl acrylate; The functionality of the polyester acrylate prepolymer is 3; the functionality of the polyurethane acrylate is 2.

2. The gasket adhesive according to claim 1, characterized in that: The initiator comprises 2-5% by weight of initiator TPO-L and 0.3-1% by weight of photoinitiator 819.

3. The gasket adhesive according to claim 1, characterized in that: The weight ratio of the perfluoropolyether methacrylate, (N-methylperfluorohexylsulfonamido)ethyl acrylate and dodecafluoroheptyl acrylate is (3-7): (1-2):

1.

4. A method for preparing a gasket adhesive according to any one of claims 1 to 3, characterized in that: Prepared by the following method: According to the weight percentage, the diluent and the initiator are weighed and stirred to obtain a mixture A; the polyester acrylate prepolymer, the polyurethane acrylate and the color paste are weighed and added to the mixture A, and stirred to obtain a mixture B; the coupling agent is weighed and added to the mixture B, and stirred to obtain a mixture C; the silicon dioxide is weighed and added to the mixture C, and stirred to obtain a gasket glue.

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