Epoxy resin composition for IV-type bottle liner surface treatment and preparation method thereof

Abstract

The invention relates to the field of high-pressure gas storage tanks, and particularly discloses an epoxy resin composition for IV-type bottle liner surface treatment and a preparation method of the epoxy resin composition. The epoxy resin composition comprises the following raw material components in parts by weight: 80-85 parts of epoxy resin, 20-25 parts of an ammonia curing agent, 20-70 parts of an epoxy resin reactive diluent, 10-50 parts of a solvent, 0.2-0.8 part of a defoaming agent and 0.2-1.5 parts of a silane coupling agent. When the PA inner container treated by the epoxy resin composition disclosed by the invention is wound on the outer surface, the adhesive property of a resin glue solution used is relatively high, the carbon fibers are not easy to layer after being wound and cured, and the adhesive strength of the PA inner container and a composite layer is improved, so that the blasting property and normal-temperature pressure cycle performance of a high-pressure gas storage cylinder are improved.

Description

Technical Field

[0001] The present application relates to the field of high-pressure gas storage tanks, specifically, to the field of surface treatment of high-pressure gas storage tank liners, and more specifically, it relates to an epoxy resin composition for surface treatment of IV-type bottle liners and a preparation method thereof. Background Art

[0002] The development of high-pressure gas tanks began in the 1950s. At first, they were mainly metal cylinders. Because they were too heavy, they were later changed to aluminum alloy materials. This type of gas tank is called an all-metal gas tank (Type I); in the 1970s, glass fiber was wrapped around steel or aluminum linings to further reduce the weight. This type of gas tank is called a metal liner fiber hoop-wound gas tank (Type II); in the 1980s, the United States began to use carbon fiber fully wrapped to reinforce the aluminum liner to further reduce the weight. This type of gas tank is called a metal liner fiber fully wrapped gas tank (Type III); in the 1990s, the United States began to use high-density polyethylene as the lining and glass fiber or carbon fiber wrapped on the outer surface to manufacture high-pressure gas tanks. This type of gas tank has the lightest weight and is called a non-metal liner fiber fully wrapped gas tank (Type IV).

[0003] Some existing Type IV high-pressure hydrogen storage tanks are lined with polyamide (PA) liner, which is made of carbon fiber epoxy resin wet full winding and medium temperature curing. Among them, the liner made of PA has low surface polarity and low surface capacity without surface treatment, and has poor bonding performance with resin glue. It is very easy to delaminate after carbon fiber winding and curing, so the PA liner must be surface treated. The traditional surface treatment method is to use flame high-temperature treatment, that is, using a mixture of natural gas and air, when the flame temperature is close to 1000°C, high temperature is used to produce polar groups on the plastic surface to increase the bonding performance between the PA liner and the composite layer (obtained after carbon fiber epoxy resin wet full winding and curing).

[0004] However, the bonding performance increased by this method will gradually decay as the PA liner is placed for a longer time, and the high-temperature treatment can easily cause the PA liner to deform, making the treatment effect uncertain over time. The stability of product quality cannot be guaranteed during mass production, and it also increases the safety risks of the company's production. Summary of the invention

[0005] In order to solve the above technical problems, the present application provides an epoxy resin composition for surface treatment of type IV bottle liner and a preparation method thereof.

[0006] In the first aspect, the present application provides an epoxy resin composition for surface treatment of a type IV bottle liner, which adopts the following technical solution: An epoxy resin composition for surface treatment of type IV bottle liner, the raw materials used include the following components: Epoxy resin 80-85 parts by weight; 20-25 parts by weight of curing agent; Epoxy resin reactive diluent 20-70 parts by weight; 10-50 parts by weight of solvent; Defoaming agent 0.2-0.8 parts by weight; Silane coupling agent 0.2-1.5 parts by weight.

[0007] By adopting the above technical scheme, the present application adopts epoxy resin, curing agent, epoxy resin active diluent, solvent, defoaming agent and silane coupling agent within a certain ratio range to prepare an epoxy resin composition for surface treatment of the PA liner. After curing at room temperature, the PA liner and the resin glue used for winding the outer surface can have strong bonding properties, and the carbon fiber winding is not easy to delaminate after curing, thereby improving the bonding strength between the PA liner and the composite layer, thereby improving the blasting performance and room temperature pressure cycle performance of the high-pressure gas storage tank.

[0008] And because the epoxy resin composition can form a strong chemical bond with the PA molecule by utilizing the highly reactive epoxy groups in the epoxy resin when curing on the surface of the PA liner; at the same time, the addition of epoxy resin active diluent, solvent and other components not only reduces the viscosity of the epoxy resin, improves its processing performance, and promotes the epoxy resin to form a more uniform and dense cross-linked network structure during the curing process, but also participates in the curing reaction of the epoxy resin and becomes a part of the cross-linked network structure of the epoxy resin cured product, thereby accelerating the curing speed and improving the curing effect; the alkoxy group in the silane coupling agent can be hydrolyzed to form a chemical bond with the PA surface, thereby improving the affinity between the epoxy resin and the PA, and at the same time, other active groups in the silane coupling agent react with the epoxy resin or the curing agent, thereby enhancing the cross-linking polymerization ability between the epoxy resin composition and the PA; the curing agent further enhances the bonding force between the epoxy resin and the PA during the curing process; Therefore, compared with the traditional flame high temperature treatment method, the use of the epoxy resin composition of the present application to treat the PA liner can not only make the resin glue used when the PA liner is wrapped with the outer surface have extremely high bonding performance, but also the bonding performance will not gradually decay with the extension of the placement time of the PA liner, thereby ensuring the stability of product quality during mass production. And compared with the traditional cold plasma treatment method, which is a physical repair method, that is, using the active particles of the plasma to remove dirt and organic matter on the surface of the PA liner, etching the surface of the PA liner, increasing the contact area of ​​the resin glue used when the PA liner is wrapped with the outer surface, and interrupting some chemical bonds on the surface of the PA liner, the epoxy resin composition of the present application can form a strong bond with the PA molecules in the PA liner, thereby activating the overall surface activity of the PA material, and then significantly improving the bonding performance of the PA liner and the composite layer.

[0009] Preferably, the weight ratio of the epoxy resin, epoxy resin reactive diluent and solvent is (80-85):(40-60):(25-45).

[0010] Preferably, the weight ratio of the epoxy resin, the epoxy resin reactive diluent and the solvent is 82:50:35.

[0011] By adopting the above technical solution, the present application optimizes the ratio between epoxy resin, epoxy resin active diluent and solvent, which can not only utilize epoxy resin active diluent and solvent to improve the processing performance of epoxy resin, promote the epoxy resin to form a more uniform and dense cross-linked network structure during the curing process, but also enable the two to participate in the curing reaction of epoxy resin and become part of the cross-linked network structure of epoxy resin cured product, thereby accelerating the curing speed and improving the curing effect. Experiments have shown that when the weight ratio of epoxy resin, epoxy resin active diluent and solvent is 82:50:35, the epoxy resin composition can better play the role of improving the bonding performance between the PA liner and the composite layer.

[0012] Optionally, the epoxy resin includes bisphenol A epoxy resin and / or bisphenol F epoxy resin.

[0013] Optionally, the silane coupling agent includes one or more of γ-aminopropyltriethoxysilane, γ-glycidyloxypropyltrimethoxysilane and γ-methacryloxypropyltrimethoxysilane.

[0014] Preferably, the epoxy resin is bisphenol A epoxy resin, and the silane coupling agent is γ-aminopropyltriethoxysilane.

[0015] Preferably, the weight ratio of the bisphenol A epoxy resin to γ-aminopropyltriethoxysilane is 82:1.

[0016] Through the above technical solution, it has been proved through experiments that compared with other combinations of epoxy resins and silane coupling agents, the present application uses a mixture of bisphenol A epoxy resin and γ-aminopropyl triethoxysilane, which can give full play to the chemical reaction characteristics and mutual reinforcement between the two, thereby improving the epoxy resin's effect of improving the bonding performance between the PA liner and the resin glue during the curing process. In addition, when the weight ratio of bisphenol A epoxy resin to γ-aminopropyl triethoxysilane is 82:1, the synergistic effect of the two is better.

[0017] Optionally, the curing agent is an ammonia curing agent.

[0018] Optionally, the ammonia curing agent includes but is not limited to ethylenediamine, diethylenetriamine, triethyltetramine, m-phenylenediamine, diaminodiphenylmethane, diphenylenediamine (DMP-30), benzyldimethylamine, isophoronediamine, 105 condensed amine epoxy curing agent, hydroxyethylethylenediamine (120 curing agent), phenolic amine epoxy curing agent (T-31 curing agent), liquid modified aromatic amine curing agent (590 curing agent), β,β'-dimethylaminoethoxy-1,3,6,2-trioxaboroctane (594 curing agent) and 810 underwater epoxy curing agent.

[0019] Optionally, the epoxy resin active diluent is a glycidyl ether diluent.

[0020] Optionally, the glycidyl ether diluent includes one or more of butyl glycidyl ether diluent (660 diluent), benzyl glycidyl ether diluent (692 diluent) and phenyl glycidyl ether diluent (690 diluent).

[0021] Optionally, the solvent includes one or more of acetone, ethanol, tetrahydrofuran, ethyl acetate, toluene and xylene.

[0022] Optionally, the defoamer includes one or more of defoamer BYK-066N, defoamer BYK-141, defoamer BYK-550, defoamer BYK-500, defoamer DF-1310, defoamer DF-1312, defoamer DF-1311, defoamer S-100, defoamer YS-100 and defoamer YS-180.

[0023] In a second aspect, the present application provides a method for preparing the epoxy resin composition for surface treatment of the above-mentioned IV type bottle liner, using the following technical solution: A method for preparing an epoxy resin composition for surface treatment of a type IV bottle liner comprises the following steps: At room temperature, all the raw materials are mixed and stirred for 15-20 minutes to obtain an epoxy resin composition for surface treatment of type IV bottle liner.

[0024] In summary, this application has the following beneficial technical effects: 1. The epoxy resin composition of the present application is applied to the PA liner with a brush, and after curing at room temperature, it can be firmly combined with the PA liner, achieving the effect of treating the surface of the PA liner at room temperature; 2. The resin glue used when the PA liner treated with the epoxy resin composition of the present application is wound with the outer surface has high bonding performance, and the carbon fiber winding is not easy to delaminate after curing, which improves the bonding strength between the PA liner and the composite layer, thereby improving the blasting performance and room temperature pressure cycle performance of the high-pressure gas storage cylinder; 3. Compared with the traditional high-temperature flame treatment method, the use of the epoxy resin composition of the present application to treat the PA liner not only does not cause deformation of the PA liner, but also enables the PA liner and the composite layer to maintain a high bonding performance, thereby ensuring the stability of product quality during mass production; 4. Compared with the traditional cold plasma treatment method, the use of the epoxy resin composition of the present application to treat the PA liner can activate the overall surface activity of the PA material, thereby significantly improving the bonding performance between the PA liner and the composite layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a cross-sectional view of a Type IV high-pressure gas storage cylinder prepared in Examples 1-13 of the present application; Figure 2 It is a partial enlarged view of the cross-section of the IV type high pressure gas storage cylinder prepared in Examples 1-13 of the present application; Figure 3 It is a cross-sectional view of the IV type high pressure gas storage cylinder prepared in the blank group. DETAILED DESCRIPTION

[0026] In some specific embodiments of the epoxy resin composition for treating the surface of a type IV bottle liner, the epoxy resin includes bisphenol A epoxy resin and / or bisphenol F epoxy resin.

[0027] In some specific embodiments of the epoxy resin composition for surface treatment of type IV bottle liners, the ammonia curing agent is one of ethylenediamine, diethylenetriamine, triethyltetramine, m-phenylenediamine, diaminodiphenylmethane, diphenylenediamine (DMP-30), benzyldimethylamine, isophoronediamine, 105 condensed amine epoxy curing agent, hydroxyethylethylenediamine (120 curing agent), phenolic amine epoxy curing agent (T-31 curing agent), liquid modified aromatic amine curing agent (590 curing agent), β,β'-dimethylaminoethoxy-1,3,6,2-trioxaborolatoxacycle (594 curing agent) and 810 underwater epoxy curing agent.

[0028] In some specific embodiments of the epoxy resin composition for surface treatment of type IV bottle liners, the glycidyl ether diluent includes one or more of butyl glycidyl ether diluent (660 diluent), benzyl glycidyl ether diluent (692 diluent) and phenyl glycidyl ether diluent (690 diluent).

[0029] In some specific embodiments of the epoxy resin composition for surface treatment of type IV bottle liners, the solvent includes one or more of acetone, ethanol, tetrahydrofuran, ethyl acetate, toluene and xylene.

[0030] In some specific embodiments of the epoxy resin composition for surface treatment of type IV bottle liners, the defoamer includes one or more of defoamer BYK-066N, defoamer BYK-141, defoamer BYK-550, defoamer BYK-500, defoamer DF-1310, defoamer DF-1312, defoamer DF-1311, defoamer S-100, defoamer YS-100 and defoamer YS-180.

[0031] In some specific embodiments of the epoxy resin composition for surface treatment of type IV bottle liners, the silane coupling agent includes one or more of γ-aminopropyltriethoxysilane (KH550), γ-glycidyloxypropyltrimethoxysilane (KH560) and γ-methacryloxypropyltrimethoxysilane (KH570).

[0032] In some specific embodiments of the epoxy resin composition for surface treatment of type IV bottle liners, the above raw materials are used and the following preparation method is followed: at room temperature, 80-85 parts by weight of epoxy resin, 20-25 parts by weight of ammonia curing agent, 20-70 parts by weight of epoxy resin active diluent, 10-50 parts by weight of solvent, 0.2-0.8 parts by weight of defoaming agent and 0.2-1.5 parts by weight of silane coupling agent are mixed and stirred for 15-20 minutes; the obtained epoxy resin composition for surface treatment of type IV bottle liners is applied to the surface of PA liners with a brush, and can be firmly combined with PA liners after curing at room temperature for more than 4 hours, and the resin glue used when winding with the outer surface has good bonding performance, and the carbon fiber winding does not delaminate after curing. After testing, the bursting pressure of the high-pressure gas storage cylinder prepared by the above method is greater than 98MPa, and under the conditions that the lower limit of the cycle pressure is 2MPa, the upper limit of the cycle pressure is greater than or equal to 1.25 times the nominal working pressure, and the pressure cycle frequency is less than or equal to 10 times / min, the number of cycles is greater than 68,000 times. It has better bursting performance and normal temperature pressure cycle performance, and is safe and reliable.

[0033] In combination with the above content, the applicant further uses the following Examples 1-13 to further illustrate the effect of the epoxy resin composition of the present application on the performance of high-pressure gas storage cylinders.

[0034] Unless otherwise specified, the raw materials used in this application are all commercially available products, including: Bisphenol A epoxy resin and bisphenol F epoxy resin were purchased from Yueyang Petrochemical; Diethylenetriamine was purchased from Jiangsu Bosite Chemical Technology Co., Ltd.; 692 diluent was purchased from Nanjing Bermuda Biotechnology Co., Ltd.; Tetrahydrofuran was purchased from Jinhao Chemical; Defoamer DF-1310 was purchased from Defeng Defoamer; Silane coupling agent KH550 was purchased from Jinan Huijinchuan Chemical Co., Ltd.

[0035] Example 1 A method for preparing an epoxy resin composition for surface treatment of a type IV bottle liner comprises the following steps: At room temperature, 80 kg of bisphenol A epoxy resin, 20 kg of diethylenetriamine, 20 kg of 692 diluent, 10 kg of tetrahydrofuran, 0.2 kg of defoamer DF-1310 and 0.2 kg of silane coupling agent KH550 were mixed and stirred for 15 minutes to prepare an epoxy resin composition for surface treatment of type IV bottle liner.

[0036] Example 2 A method for preparing an epoxy resin composition for surface treatment of a type IV bottle liner comprises the following steps: At room temperature, 85 kg of bisphenol A epoxy resin, 25 kg of diethylenetriamine, 70 kg of 692 diluent, 50 kg of tetrahydrofuran, 0.8 kg of defoamer DF-1310 and 1.5 kg of silane coupling agent KH550 were mixed and stirred for 15 minutes to prepare an epoxy resin composition for surface treatment of type IV bottle liner.

[0037] Example 3 A method for preparing an epoxy resin composition for surface treatment of a type IV bottle liner comprises the following steps: At room temperature, 82 kg of bisphenol A epoxy resin, 22 kg of diethylenetriamine, 50 kg of 692 diluent, 35 kg of tetrahydrofuran, 0.5 kg of defoamer DF-1310 and 1.0 kg of silane coupling agent KH550 were mixed and stirred for 15 minutes to prepare an epoxy resin composition for surface treatment of type IV bottle liner.

[0038] Example 4 A method for preparing an epoxy resin composition for surface treatment of a type IV bottle liner comprises the following steps: At room temperature, 82 kg of bisphenol A epoxy resin, 22 kg of diethylenetriamine, 40 kg of 692 diluent, 25 kg of tetrahydrofuran, 0.5 kg of defoamer DF-1310 and 1.0 kg of silane coupling agent KH550 were mixed and stirred for 15 minutes to prepare an epoxy resin composition for surface treatment of type IV bottle liner.

[0039] Example 5 A method for preparing an epoxy resin composition for surface treatment of a type IV bottle liner comprises the following steps: At room temperature, 82 kg of bisphenol A epoxy resin, 22 kg of diethylenetriamine, 60 kg of 692 diluent, 45 kg of tetrahydrofuran, 0.5 kg of defoamer DF-1310 and 1.0 kg of silane coupling agent KH550 were mixed and stirred for 15 minutes to prepare an epoxy resin composition for surface treatment of type IV bottle liner.

[0040] Example 6 A method for preparing an epoxy resin composition for surface treatment of a type IV bottle liner comprises the following steps: At room temperature, 82 kg of bisphenol A epoxy resin, 22 kg of diethylenetriamine, 20 kg of 692 diluent, 10 kg of tetrahydrofuran, 0.5 kg of defoamer DF-1310 and 1.0 kg of silane coupling agent KH550 were mixed and stirred for 15 minutes to prepare an epoxy resin composition for surface treatment of type IV bottle liner.

[0041] Example 7 A method for preparing an epoxy resin composition for surface treatment of a type IV bottle liner comprises the following steps: At room temperature, 82 kg of bisphenol A epoxy resin, 22 kg of diethylenetriamine, 70 kg of 692 diluent, 50 kg of tetrahydrofuran, 0.5 kg of defoamer DF-1310 and 1.0 kg of silane coupling agent KH550 were mixed and stirred for 15 minutes to prepare an epoxy resin composition for surface treatment of type IV bottle liner.

[0042] Example 8 A method for preparing an epoxy resin composition for surface treatment of a type IV bottle liner is different from that of Example 3 in that bisphenol A epoxy resin is replaced by bisphenol F epoxy resin, and the rest is the same as Example 3.

[0043] Example 9 A method for preparing an epoxy resin composition for surface treatment of a type IV bottle liner, which is different from Example 3 in that the silane coupling agent KH550 is replaced by the silane coupling agent KH560, and the rest is the same as Example 3.

[0044] Example 10 A method for preparing an epoxy resin composition for surface treatment of a type IV bottle liner, which is different from Example 3 in that the silane coupling agent KH550 is replaced by the silane coupling agent KH570, and the rest is the same as Example 3.

[0045] Embodiment 11 A method for preparing an epoxy resin composition for surface treatment of a type IV bottle liner, which is different from Example 3 in that bisphenol A epoxy resin is replaced by bisphenol F epoxy resin, and silane coupling agent KH550 is replaced by silane coupling agent KH570, and the rest is the same as Example 3.

[0046] Example 12 A method for preparing an epoxy resin composition for surface treatment of type IV bottle liner, which is different from Example 3 in that: the amount of bisphenol A epoxy resin used is 80 kg, the amount of silane coupling agent KH550 used is 0.2 kg, and the rest is the same as Example 3.

[0047] Example 13 A method for preparing an epoxy resin composition for surface treatment of type IV bottle liner, which is different from Example 3 in that: the amount of bisphenol A epoxy resin used is 85 kg, the amount of silane coupling agent KH550 used is 1.5 kg, and the rest is the same as Example 3.

[0048] Performance Testing 14 40L PA liners were selected, one of which was not treated as a blank group. The remaining 13 were brushed with the epoxy resin composition obtained in Examples 1-13 above, and then placed at room temperature for 4 hours to obtain a type IV bottle liner. The 40L type IV bottle liner was then wound with TZ700 carbon fiber and epoxy resin to obtain a type IV bottle high-pressure gas cylinder. The winding process used a winding process known in the art, and the winding processes of all groups were exactly the same. At the same time, 2 40L PA liners were selected as a control group. The PA liners were surface treated by cold plasma treatment and flame high-temperature treatment, respectively. Then, the same winding process as the above 13 PA liners was used for winding, and 2 type IV bottle high-pressure gas cylinders were also obtained. The cold plasma treatment and flame high-temperature treatment were both performed in accordance with conventional operations in the art. The following performance tests were then performed on all the obtained type IV bottle high-pressure gas cylinders: 1. Sample cutting test: All IV type high pressure gas cylinders are tested for sample cutting to observe the bonding between the PA liner and the composite layer. The results are as follows: Figure 1-3 As shown; 2. Explosion performance test: The test was conducted in accordance with the provisions of GB / T 15385. During the test, the pressure was increased at a rate of less than or equal to 0.35 MPa / s until the explosion, and the maximum pressure at the time of explosion was recorded. The results are shown in Table 1. 3. Normal temperature pressure cycle performance test: The test was carried out in accordance with the provisions of GB / T 9252. During the test, the lower limit of the cycle pressure was 2MPa, the upper limit was greater than or equal to 1.25 times the nominal working pressure, the pressure cycle frequency was less than or equal to 10 times / min, and the number of cycles was recorded. The results are shown in Table 1.

[0049] Table 1 Performance test results project Burst pressure(MPa) Cycle times (times) Example 1 98.73 68350 Example 2 98.75 68420 Example 3 99.32 69200 Example 4 99.16 69115 Example 5 99.13 69108 Example 6 98.82 68570 Example 7 98.85 68585 Example 8 98.12 68170 Example 9 98.16 68159 Example 10 98.15 68150 Embodiment 11 98.04 68072 Example 12 99.18 69134 Embodiment 13 99.24 69172 Blank Group 75.12 24000 Cold plasma treatment 81.34 31000 Flame high temperature treatment 90.55 54200 Data Analysis: As can be seen from Table 1, the maximum pressure of the IV-type high-pressure gas storage cylinders of Examples 1-13 of the present application when exploded is above 98 MPa, and the number of normal temperature pressure cycles is above 68,000 times, which is significantly higher than that of the blank group, and Figure 1-2 As shown, the interface bonding effect between the PA liner of the high-pressure gas storage tank of Examples 1-13 of the present application and the composite layer is good. (Since the cross-sectional views of Examples 1-13 are similar, only the cross-sectional views are shown.) Figure 1 and Figure 2 As an example), Figure 3 The bonding effect at the interface between the PA liner and the composite layer of the blank group is poor, and dents occur. It can be seen that after the PA liner is treated with the epoxy resin composition of the present application, the bonding effect between the PA liner and the composite layer can be significantly improved, and the blasting performance and normal temperature pressure cycling performance of the IV type bottle high-pressure gas storage tank can be significantly enhanced.

[0050] Among them, according to the data comparison of Examples 1-7, it can be seen that Example 3 has the highest bursting pressure and normal temperature pressure cycle number, and Examples 4-5 have higher bursting pressure and normal temperature pressure cycle number than Examples 6-7. It can be seen that further optimizing the ratio between bisphenol A epoxy resin, 692 diluent and tetrahydrofuran can further enhance the bonding effect between the PA liner and the composite layer, thereby improving the bursting performance and normal temperature pressure cycle performance of the IV type bottle high pressure gas storage tank.

[0051] The difference between Example 8-11 and Example 3 is that different combinations of epoxy resins and silane coupling agents are used. It can be seen from Table 1 that the bursting pressure and normal temperature pressure cycle number of Examples 8-11 are lower than those of Example 3. It can be seen that compared with other combinations of epoxy resins and silane coupling agents, the mixed use of bisphenol A epoxy resin and silane coupling agent KH550 can give full play to the synergistic effect of the two, thereby improving the bonding effect between the PA liner and the composite layer, and further enhancing the bursting performance and normal temperature pressure cycle performance of the IV type bottle high pressure gas storage tank.

[0052] The difference between Examples 12-13 and Example 3 is that the ratio of bisphenol A epoxy resin and silane coupling agent KH550 is different. It can be seen from Table 1 that the bursting pressure and normal temperature pressure cycle number of Examples 12-13 are lower than those of Example 3. It can be seen that further optimizing the ratio of bisphenol A epoxy resin and silane coupling agent KH550 can further enhance the bonding effect between the PA liner and the composite layer, thereby improving the bursting performance and normal temperature pressure cycle performance of the IV type bottle high pressure gas storage tank.

[0053] The difference between the control group and Example 3 is that the PA liner is treated by traditional cold plasma treatment and flame high temperature treatment. It can be seen from Table 1 that the bursting pressure and normal temperature pressure cycle number of the two control groups are lower than those of Example 3. It can be seen that compared with the traditional cold plasma treatment and flame high temperature treatment, the epoxy resin composition of the present application is used to treat the PA liner, which can enhance the bonding effect between the PA liner and the composite layer, thereby improving the bursting performance and normal temperature pressure cycle performance of the IV type bottle high pressure gas storage tank.

[0054] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An epoxy resin composition for surface treatment of type IV bottle liner, characterized in that: The raw materials used include the following components: Epoxy resin 80-85 parts by weight; 20-25 parts by weight of curing agent; Epoxy resin reactive diluent 20-70 parts by weight; 10-50 parts by weight of solvent; Defoaming agent 0.2-0.8 parts by weight; Silane coupling agent 0.2-1.5 parts by weight.

2. The epoxy resin composition for surface treatment of type IV bottle liner according to claim 1, characterized in that: The weight ratio of the epoxy resin, the epoxy resin active diluent and the solvent is (80-85): (40-60): (25-45).

3. The epoxy resin composition for surface treatment of type IV bottle liner according to claim 2, characterized in that: The weight ratio of the epoxy resin, the epoxy resin active diluent and the solvent is 82:50:

35.

4. The epoxy resin composition for surface treatment of type IV bottle liner according to claim 1, characterized in that: The epoxy resin includes bisphenol A epoxy resin and / or bisphenol F epoxy resin.

5. The epoxy resin composition for surface treatment of type IV bottle liner according to claim 1, characterized in that: The silane coupling agent includes one or more of γ-aminopropyltriethoxysilane, γ-glycidyloxypropyltrimethoxysilane and γ-methacryloxypropyltrimethoxysilane.

6. The epoxy resin composition for surface treatment of type IV bottle liner according to claim 1, characterized in that: The epoxy resin is bisphenol A epoxy resin, and the silane coupling agent is γ-aminopropyltriethoxysilane.

7. The epoxy resin composition for surface treatment of type IV bottle liner according to claim 6, characterized in that: The weight ratio of the bisphenol A epoxy resin to γ-aminopropyltriethoxysilane is 82:

1.

8. The epoxy resin composition for surface treatment of type IV bottle liner according to claim 1, characterized in that: The curing agent is an ammonia curing agent.

9. The epoxy resin composition for surface treatment of type IV bottle liner according to claim 1, characterized in that: The epoxy resin active diluent is a glycidyl ether diluent.

10. A method for preparing the epoxy resin composition for surface treatment of type IV bottle liner according to claim 1, characterized in that: The following steps are involved: At room temperature, all the raw materials are mixed and stirred for 15-20 minutes to obtain an epoxy resin composition for surface treatment of type IV bottle liner.

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