A method for manufacturing a weather-resistant and salt-spray-resistant FRP unit for bridge collision prevention

Abstract

The invention discloses a method for making a weather-resistant and salt-spray-resistant FRP unit for bridge anti-collision, comprising the following steps: preparing a mold, a mold having an open top cavity; spraying a gel coat based on acrylic modified vinyl resin on the inner surface of the mold cavity; laying a reinforcing material in the mold cavity; covering the opening of the cavity with a vacuum bag to form a closed cavity; after vacuuming the cavity, introducing a mixture of a formula amount of acrylic modified vinyl resin, ultraviolet absorber, light stabilizer, leveling agent, defoamer, auxiliary agent, accelerator, and curing agent, and then introducing a diluent to adjust the viscosity, curing, and demolding to obtain a weather-resistant and salt-spray-resistant FRP unit for bridge anti-collision. The FRP unit produced by the method solves the problems of poor weather resistance and salt-spray resistance of existing FRP units and high volatile content, brings better economic benefits to society, and does not contain heavy metals and alkylphenol polyoxyethylene ether, and will not pollute river water quality.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge anti-collision, and in particular relates to a weather-resistant and salt-spray-resistant FRP unit for bridge anti-collision and a manufacturing method thereof. Background Art

[0002] With the development of transportation and inland waterway shipping, my country's shipping volume continues to increase, and the problem of ship collisions with bridges has become increasingly prominent. In order to ensure the safety of bridges and protect the safety of passing ships and personnel, it is very necessary to set up bridge anti-collision facilities. my country mainly adopts passive anti-collision design methods in bridge anti-collision design. Common anti-collision design methods are generally: artificial islands, piers outside piers, cofferdams, anti-collision pile groups, solid piers, floating flexible anti-collision systems, composite anti-collision systems, etc. The problem of bridge anti-collision involves multiple disciplines, such as structural mechanics, collision mechanics, bridge engineering, hydrodynamics, etc. The purpose is to prevent the bridge from exceeding the design bearing capacity of the piers due to the collision force of ships and protect the safety of bridge structures. Improve the technical level of bridge anti-collision devices, ensure bridge safety, reduce the degree of harm caused by ship collision accidents, and protect the safety of life and property. Secondly, under the condition of meeting the requirements of bridge anti-collision design, reduce the water area occupied by bridge anti-collision devices, and leave as much water as possible to the original waterway, so as to facilitate the win-win development and harmonious coexistence of both water and land transportation modes.

[0003] Glass fiber reinforced plastic (GFRP for short) is widely used in the fields of construction, chemical industry, transportation, electricity, communication, etc. due to its characteristics of light weight, high strength, corrosion resistance, good designability and excellent processability. When FRP units are used for bridge anti-collision, the FRP units are partially immersed in water for a long time, and the water-resistant part needs to have a high salt spray resistance level, and the part is exposed to the atmosphere and needs to meet the weather resistance requirements; therefore, the FRP units need to meet the requirements of weather resistance and salt spray resistance while having excellent mechanical properties, and should not pollute the water body; however, the existing FRP units for bridge anti-collision mainly have the following problems: 1) The commonly used thermosetting resin-vinyl resin has weather resistance problems, and the supporting raw materials have low weather resistance levels; 2) The FRP units have low curing degree, poor salt spray resistance, and poor water resistance; 3) The product content has a high VOC content. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, the main purpose of the present invention is to provide a weather-resistant and salt-spray-resistant FRP unit for bridge anti-collision, aiming to solve the problem that the existing FRP unit has poor weather resistance and salt-spray resistance and high volatile content. The present invention also provides a method for manufacturing the weather-resistant and salt-spray-resistant FRP unit for bridge anti-collision.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A method for manufacturing a weather-resistant and salt-spray-resistant FRP unit for bridge collision prevention comprises the following steps:

[0007] 1) Mold preparation: the mold is provided with a cavity with an open top;

[0008] 2) spraying a gel coat based on acrylic modified vinyl resin on the inner surface of the mold cavity;

[0009] 3) Laying reinforcement material in the mold cavity;

[0010] 4) Covering the opening of the cavity with a vacuum bag to form a closed cavity;

[0011] 5) After the cavity is evacuated, a mixture of a formulated amount of acrylic modified vinyl resin, ultraviolet absorber, light stabilizer, leveling agent, defoamer, additive, accelerator, and curing agent is introduced, and then a diluent is introduced to adjust the viscosity. After curing, the weather-resistant and salt-spray-resistant FRP unit of the bridge is obtained by demolding.

[0012] Furthermore, the paving reinforcement material is alkali-free glass cloth modified by inorganic coating.

[0013] Furthermore, it includes the following components in percentage by mass: 15-40% of acrylic modified vinyl resin, 20-60% of inorganic coated modified alkali-free glass cloth, 2-5% of ultraviolet absorber, 2-5% of light stabilizer, 0.1-10% of leveling agent, 0.1-0.5% of defoaming agent, 0.5-1.0% of auxiliary agent, 0.1-1.0% of accelerator, 0.1-1.0% of curing agent and 5-15% of active diluent.

[0014] Furthermore, the acrylic modified vinyl resin is a vinyl resin modified by acrylic acid, and the acrylic modifier is one or both of propylene glycol methyl ether acetate and methyl methacrylate.

[0015] Furthermore, the inorganic coating modified alkali-free glass cloth is an alkali-free glass cloth coated and modified with one or a mixture of any two or more of titanium dioxide, zirconium oxide, aluminum oxide, and fumed silica.

[0016] Furthermore, the ultraviolet absorber is one or more of hydroxybenzotriazoles, hydroxyphenylbenzotriazoles, triazines, and benzophenones.

[0017] Furthermore, the light stabilizer is one of liquid hindered amines or benzotriazoles containing amino ether groups, or a mixture thereof.

[0018] Furthermore, the leveling agent is a fluorocarbon leveling agent containing unsaturated double bonds.

[0019] Furthermore, the defoamer is a dissolving defoamer.

[0020] Further, the diluent is one or both of styrene or olefin containing active unsaturated groups;

[0021] The auxiliary agent is alkylphenol polyoxyethylene ether;

[0022] The accelerator is an iron complex;

[0023] The curing agent is one of formyl peroxide or dimethylaniline.

[0024] Compared with the prior art, the present invention has at least the following advantages:

[0025] 1. The resin used in the present invention is an acrylic acid-modified vinyl resin containing propylene glycol methyl ether acetate and 40-50% methyl methacrylate, which improves the weather resistance of the vinyl resin;

[0026] 2. The present invention adopts alkali-free glass cloth modified by inorganic coating, which greatly improves the weather resistance and salt spray resistance of the FRP unit, and also greatly improves the mechanical properties;

[0027] 3. The present invention adopts a compound system of light stabilizer and ultraviolet absorber to improve the weather resistance of the product;

[0028] 4. The present invention adopts a compound system of accelerator and curing agent to improve the curing degree of the FRP unit, thereby improving the weather resistance, salt spray resistance and physical properties of the product;

[0029] 5. The present invention adopts a non-volatile active diluent, and the VOC content and flammability of the product make the entire production process more environmentally friendly and safe, which is beneficial to the physical and mental health of workers;

[0030] 6. The present invention does not add heavy metals or alkylphenol polyoxyethylene ether raw materials, and will not affect the quality of rivers and environmental water. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation of the present invention, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0032] Figure 1 A method for manufacturing a weather-resistant and salt-spray-resistant FRP unit for bridge collision prevention is provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following embodiments are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0034] When a certain amount, concentration or other value or parameter is expressed in the form of a range, a preferred range, or a preferred upper and lower numerical limit, it should be understood that it is equivalent to specifically revealing any range by combining any pair of upper range limits or preferred numerical values ​​with any lower range limit or preferred numerical value, regardless of whether the range is specifically disclosed. Unless otherwise indicated, the numerical range values ​​listed herein include the endpoints of the range, and all integers and fractions within the range.

[0035] Unless otherwise indicated, all percentages, parts, ratios, etc. herein are by weight.

[0036] The materials, methods, and examples herein are illustrative and are not to be construed as limiting unless specifically stated.

[0037] In the following examples, the acrylic acid-modified vinyl resin used is an acrylic acid-modified vinyl resin, and the acrylic acid modifier is propylene glycol methyl ether acetate, and the acrylic acid-modified vinyl resin is Xinlirong VE-998;

[0038] The inorganic coated modified alkali-free glass cloth is an alkali-free glass cloth coated with a mixture of titanium dioxide and zirconium oxide; the conventional model is Changhai BL-504;

[0039] The UV absorber is hydroxybenzotriazole; the general brand UV-326 is selected;

[0040] The light stabilizer is benzotriazole; the general brand UV-328 is selected; the leveling agent is a fluorocarbon leveling agent containing unsaturated double bonds, and AFK368 is selected; the defoaming agent is a dissolving defoaming agent, and Shilan DF5006 is selected; the diluent is an active styrene containing unsaturated groups, and Dahua PX51 is selected; the accelerator is an iron complex, and the iron complex does not contain lead octanoate and heavy metals, and British Mining BOC is selected; the curing agent is formyl peroxide.

[0041] Embodiment 1:

[0042] The method for manufacturing a weather-resistant and salt-spray-resistant FRP unit for bridge collision prevention provided in the present application uses raw material components as shown in Table 1. Table 2 is a table showing the relevant performance of the FRP unit produced using the raw material components in Table 1:

[0043] Table 1 Raw material composition and ratio of the method for making the FRP unit of this embodiment

[0044]

[0045] Table 2 Performance indicators of the FRP unit of this comparative example

[0046]

[0047] The present invention provides a method for manufacturing a weather-resistant and salt-spray-resistant FRP unit for bridge collision prevention, which specifically comprises the following steps:

[0048] S110, preparing a mold, the mold is provided with a cavity with an open top;

[0049] Specifically, the mold is prepared, a cavity with an open top is opened on the mold, the mold should withstand a certain compressive bearing capacity, and the mold surface needs to be cleaned and rust-removed.

[0050] S120, spraying a gel coat based on acrylic acid-modified vinyl resin on the inner surface of the cavity of the mold;

[0051] Specifically, a gel coat based on acrylic modified vinyl resin is sprayed on the inner surface of the mold cavity, and during the spraying, the spraying must be uniform.

[0052] S130, laying a reinforcing material in the mold cavity;

[0053] Specifically, the reinforcing material is laid in the cavity of the mold. The reinforcing material can be closely attached to the inner wall of the cavity or suspended in the cavity.

[0054] S140, piping layout;

[0055] Specifically, pipelines are arranged on the mold, and the pipelines include vacuum pipelines and injection pipelines. The vacuum pipeline is used to draw vacuum into the cavity, and the injection pipeline is used to inject raw materials.

[0056] S150, covering the opening of the cavity with a vacuum bag to form a closed cavity;

[0057] Specifically, a vacuum bag is first made, and the vacuum bag is covered on the mold and sealed with the cavity. Subsequently, the vacuum pipe and the injection pipe are connected to the relevant joints on the vacuum bag. When connecting, attention should be paid to the sealing of the connection.

[0058] S160, after evacuating the cavity, introduce a mixture of acrylic modified vinyl resin, ultraviolet absorber, light stabilizer, leveling agent, defoamer, auxiliary agent, accelerator and curing agent in the amount specified in Table 1, then introduce a diluent to adjust the viscosity, and after curing and demolding, obtain a weather-resistant and salt-spray-resistant FRP unit for bridge anti-collision.

[0059] Specifically, the cavity is first evacuated through a vacuum pipe to make the cavity in a negative pressure state, and then the corresponding components can be injected into the cavity through the injection pipe.

[0060] When injecting, the acrylic modified vinyl resin should be injected first, and then the leveling agent, defoaming agent, UV absorber, light stabilizer, additives, accelerator and curing agent should be injected in sequence, and finally the diluent should be added to adjust the viscosity.

[0061] Comparative Example 1:

[0062] The present application also introduces a comparative example as a control group, and its raw material formula is specifically as described in Table 3. Its components are basically the same as those in the embodiment, except that ordinary vinyl resin and conventional alkali-free glass cloth are used to produce the FRP unit, and its preparation method is the same as the preparation method of the embodiment. The performance indicators of the FRP unit produced using the raw material components in Table 3 are shown in Table 4.

[0063] Table 3 Composition and ratio of raw materials of FRP unit in this comparative example

[0064]

[0065] Table 4 Performance indicators of FRP units in this comparative example

[0066]

[0067] By comparing the two groups of data in Tables 1 and 2 with the two groups of data in Tables 3 and 4, it can be clearly seen that the ultimate load, compression strength, aging resistance and salt spray resistance of the FRP unit produced by the manufacturing method of the weather-resistant and salt spray-resistant FRP unit for bridge collision protection will be greatly improved.

[0068] It can be seen that the present invention solves the problem that the traditional FRP unit has good salt spray resistance but poor weather resistance, or good weather resistance but poor salt spray resistance, prolongs the product service life, brings better economic benefits to the society, and at the same time does not contain heavy metals and alkylphenol polyoxyethylene ether, and will not pollute the river water quality.

[0069] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A method for manufacturing a weather-resistant and salt-spray-resistant FRP unit for bridge collision protection, characterized in that: The steps include: 1) Mold preparation: the mold is provided with a cavity with an open top; 2) spraying a gel coat based on acrylic modified vinyl resin on the inner surface of the mold cavity; 3) Laying reinforcement material in the mold cavity; 4) Cover the opening of the cavity with a vacuum bag to form a closed cavity; 5) After vacuuming the cavity, a mixture of acrylic modified vinyl resin, ultraviolet absorber, light stabilizer, leveling agent, defoamer, additive, accelerator and curing agent is introduced, and then a diluent is introduced to adjust the viscosity. After curing and demolding, the weather-resistant and salt-spray-resistant FRP unit for bridge anti-collision is obtained; The reinforcing material is an alkali-free glass cloth modified by an inorganic coating, and the alkali-free glass cloth modified by an inorganic coating is an alkali-free glass cloth coated with one or a mixture of any two or more of titanium dioxide, zirconium oxide, aluminum oxide, and fumed silica; and the acrylic-modified vinyl resin is Xinlirong VE-998.

2. The method according to claim 1, characterized in that: Measured in percentage by mass, it includes the following components: 15-40% of acrylic modified vinyl resin, 20-60% of inorganic coated modified alkali-free glass cloth, 2-5% of ultraviolet absorber, 2-5% of light stabilizer, 0.1-10% of leveling agent, 0.1-0.5% of defoamer, 0.5-1.0% of auxiliary agent, 0.1-1.0% of accelerator, 0.1-1.0% of curing agent and 5-15% of diluent.

3. The method according to claim 1, characterized in that: The ultraviolet absorber is one of hydroxybenzotriazoles, hydroxyphenylbenzotriazoles, triazines, and benzophenones, or a mixture of any two or more thereof.

4. The method according to claim 1, characterized in that: The light stabilizer is one of liquid hindered amines or benzotriazoles containing amino ether groups.

5. The method according to claim 1, characterized in that: The leveling agent is a fluorocarbon leveling agent containing unsaturated double bonds.

6. The method according to claim 1, characterized in that: The defoamer is a dissolving defoamer.

7. The manufacturing method according to claim 1, characterized in that: The diluent is one or a mixture of active styrene or olefin containing unsaturated groups; The auxiliary agent is alkylphenol polyoxyethylene ether; The accelerator is an iron complex; The curing agent is one of formyl peroxide or dimethylaniline.

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