Long-acting protective material for bioengineering equipment and preparation method of long-acting protective material

Abstract

The invention discloses a long-acting protective material for bioengineering equipment and a preparation method of the long-acting protective material, and belongs to the technical field of composites.High-purity spherical zinc powder (the content of metal zinc is larger than or equal to 99%, and the particle size ranges from 500 meshes to 800 meshes) is pretreated through inorganic hybrid resin to form a compact combination, the shielding performance of a coating and the sacrificial anode protection effect are remarkably improved, and the service life of the coating is prolonged. The inorganic hybrid resin and the epoxy resin have a synergistic effect, double barriers of physical shielding and chemical protection are constructed, the protection period is prolonged, the coating is suitable for a harsh corrosion environment of bioengineering equipment, thixotropy is regulated and controlled through anti-settling auxiliaries such as polyamide wax liquid and fumed silica, leveling property is optimized in cooperation with a rheological auxiliary, and the anti-corrosion performance of the coating is improved. And the cooling device controls the slurry temperature to be lower than 55 DEG C, the zinc powder hydrogen evolution reaction caused by high temperature is avoided, and the material storage and construction stability is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of composite materials, and more specifically, to a long-acting protective material for bioengineering equipment and a preparation method thereof. Background Art

[0003] The rise of bioengineering has put forward new requirements for basic industries, especially for bio-industry production equipment, which requires that the equipment will not rust and can withstand corrosion from substances such as acids and alkalis. The most direct way is to use special metals, such as stainless steel, but for industrialization, the cost of special materials is high and they cannot be used on a large scale. The most commonly used treatment method is to use conventional materials and perform surface treatment on them. However, there are many ways to treat metal corrosion, such as hot-dip galvanizing and anti-corrosion coatings. Hot-dip galvanizing has good anti-corrosion effects, but it has the defects of high energy consumption and high pollution. Traditional anti-corrosion coatings have many construction processes, poor protection effects, and are mostly solvent-based products. After construction, there are problems such as the persistent release of VOCs, which poses a safety hazard to bioengineering production.

[0004] The current water-based epoxy zinc-rich paint mainly adopts a three-component system or a method of adding zinc powder to the curing agent. The three-component system is difficult to use. The zinc powder, resin and curing agent need to be mixed in proportion on site and then stirred evenly before use, which easily causes dust pollution on site and uneven dispersion of zinc powder, resulting in reduced quality of the coating. In the method of adding zinc powder to the curing agent, since the amount of curing agent is relatively small, in order to add enough zinc powder to the curing agent, the proportion of co-solvent can only be increased, which results in the final amount of co-solvent added to the coating being too high or the metallic zinc content in the coating being reduced. If the amount of co-solvent is not increased or the amount increased is small, the amount of zinc powder added will be small, resulting in a low metallic zinc content in the final coating and poor anti-corrosion effect. If the amount of co-solvent is increased too much, the amount of solvent in the coating will be large, which will cause an increase in the amount of VOC in subsequent use, which is not much different from using solvent-based coatings and has reduced environmental protection performance. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide a long-term protective material for bioengineering equipment and a preparation method thereof. High-purity spherical zinc powder (≥99% metallic zinc content, particle size 500-800 mesh) is pretreated with an inorganic hybrid resin (nano-silica hybrid epoxy resin) to form a dense combination, which significantly improves the shielding performance of the coating and the sacrificial anode protection effect, and effectively resists the penetration of corrosive media. The inorganic hybrid resin and epoxy resin work synergistically to construct a "physical shielding + chemical protection" double barrier to extend the protection period, which is suitable for the harsh corrosive environment of bioengineering equipment. The thixotropy is regulated by anti-settling aids such as polyamide wax liquid and fumed silica, and the leveling is optimized with rheological aids to ensure that the coating has no sag and no sedimentation when constructed on a vertical surface, meeting the coating requirements of equipment with complex structures. The cooling device controls the slurry temperature to be lower than 55°C to avoid high temperature-induced hydrogen precipitation reaction of zinc powder, thereby ensuring material storage and construction stability.

[0007] 2. Technical solution

[0008] To solve the above problems, the present invention adopts the following technical solutions.

[0009] A long-acting protective material for bioengineering equipment and a preparation method thereof, comprising a component A and a component B, wherein the component A mainly consists of 8-10 parts of epoxy resin, 3-5 parts of inorganic hybrid resin, 70-90 parts of zinc powder, 0.5-1 part of anti-settling aid, 1-2 parts of wetting dispersant, 0.5-1 part of rheological aid, 0.2-0.5 part of defoaming agent, 0.1-0.3 part of water absorbing material, 8-15 parts of cosolvent and 0.2-0.5 part of silane coupling agent, and the component B mainly consists of 1.5-3 parts of epoxy curing agent and 2-5 parts of cosolvent.

[0010] Furthermore, the epoxy resin is a water-soluble epoxy resin emulsified based on bisphenol A epoxy resin, which can be ground together with the anti-rust pigment to improve the encapsulation performance of the anti-rust pigment, and does not contain water itself.

[0011] Furthermore, the inorganic hybrid resin is nano-silicon dioxide hybrid epoxy resin.

[0012] Furthermore, the cosolvent is one or a mixture of ethylene glycol methyl ether, ethylene glycol ethyl ether, diethylene glycol ethyl ether, diethylene glycol methyl ether, propylene glycol methyl ether, dipropylene glycol methyl ether and the like.

[0013] Furthermore, the zinc powder is high-purity spherical zinc powder, the metal zinc content in the zinc powder is ≥99%, and the particle size of the zinc powder is 500 mesh-800 mesh.

[0014] Furthermore, the anti-settling aid is a material such as polyamide wax liquid, fumed silica, bentonite, etc., which can increase the thixotropy in the coating and increase the anti-settling and anti-sagging properties of the coating. One or more types can be used in combination.

[0015] Furthermore, the water-absorbing material is a molecular sieve, which mainly absorbs trace moisture in the coating to prevent hydrogen evolution reaction between zinc powder and water during storage, and the particle size is controlled below 30 μm.

[0016] Furthermore, none of the materials in the A component can contain moisture.

[0017] A method for preparing a long-acting protective material for bioengineering equipment comprises the following steps:

[0018] S1. Add 70-90 parts of zinc powder to a paint mixing tank with a cooling device, then add 8-15 parts of an environmentally friendly solvent, and stir at a low speed of 300-500 rpm to fully wet the zinc powder;

[0019] S2. Slowly add 3-5 parts of inorganic hybrid resin and 0.2-0.5 parts of silane coupling agent to the wetted zinc powder under stirring, increase the speed to 800-1000 rpm, and continue stirring for 10-20 minutes to form a combination of the hybrid resin and the zinc powder to obtain pretreated zinc powder;

[0020] S3, 8-10 parts of epoxy resin, 1-2 parts of wetting dispersant, and 0.1-0.3 parts of defoamer are put into a paint mixing tank with a cooling device in proportion, stirred at 500-600 rpm for 10 minutes, and then 0.5-1 parts of anti-settling agent are slowly added, stirred and dispersed into a slurry to form a resin slurry, and then slowly added to the pretreated zinc powder prepared in step S2 under stirring, and stirred at 1500-2000 rpm for 15-20 minutes;

[0021] S4, reduce the speed to 800-1000rpm, add 0.1-0.2 parts of defoamer and 0.5-1 parts of rheological additive, continue stirring for 15 minutes, then reduce the speed to 500-600rpm, add 0.1-0.3 parts of water-absorbing molecular sieve, and package for standby use;

[0022] S5. Dilute 1.5-3 parts of epoxy curing agent with 2-5 parts of co-solvent and package for later use.

[0023] Furthermore, the cooling device in S3 controls the temperature of the resin slurry inside the paint mixing tank to be lower than 55°C.

[0024] 3. Beneficial effects

[0025] Compared with the prior art, the advantages of the present invention are:

[0026] (1) In this scheme, high-purity spherical zinc powder (≥99% metallic zinc content, particle size 500-800 mesh) is pretreated with an inorganic hybrid resin (nano-silica hybrid epoxy resin) to form a dense bond, which significantly improves the shielding performance of the coating and the sacrificial anode protection effect, and effectively resists the penetration of corrosive media. The inorganic hybrid resin and epoxy resin work synergistically to construct a "physical shielding + chemical protection" double barrier, extending the protection period, and is suitable for the harsh corrosion environment of bioengineering equipment.

[0027] (2) The thixotropy is regulated by anti-settling agents such as polyamide wax liquid and fumed silica, and the leveling is optimized with rheological agents to ensure that the coating has no sag and no sedimentation when applied on vertical surfaces, thus meeting the coating requirements of equipment with complex structures. The cooling device controls the slurry temperature to be below 55°C to avoid high temperature-induced hydrogen evolution reaction of zinc powder, thus ensuring the stability of material storage and construction.

[0028] (3) It uses water-soluble epoxy resin emulsified based on bisphenol A epoxy resin, which does not contain free water and avoids the VOCs emission problem of traditional solvent-based coatings. It meets the high standards for environmentally friendly materials in the field of bioengineering. The molecular sieve water-absorbing material (particle size <30μm) accurately absorbs trace moisture in the coating, inhibiting the hydrolysis of zinc powder from the source and ensuring the long-term performance of the material.

[0029] (4) Inorganic hybrid resin and silane coupling agent are used to pretreat zinc powder in a coordinated manner to form a stable combination, thereby reducing the risk of zinc powder sedimentation in subsequent coatings, reducing construction difficulty and rework rate, and selecting polyol ether cosolvents such as ethylene glycol methyl ether and propylene glycol methyl ether to take into account solubility and volatilization rate, balance the coating curing speed and construction window period, and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A flow chart of the whole of the present invention;

[0031] Figure 2 It is a test result data diagram of the present invention. DETAILED DESCRIPTION

[0032] The following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all the embodiments. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Embodiment 1:

[0036] A long-acting protective material for bioengineering equipment and a preparation method thereof, comprising a component A and a component B, wherein the component A mainly consists of 8-10 parts of epoxy resin, 3-5 parts of inorganic hybrid resin, 70-90 parts of zinc powder, 0.5-1 part of anti-settling aid, 1-2 parts of wetting dispersant, 0.5-1 part of rheological aid, 0.2-0.5 part of defoaming agent, 0.1-0.3 part of water absorbing material, 8-15 parts of cosolvent and 0.2-0.5 part of silane coupling agent, and the component B mainly consists of 1.5-3 parts of epoxy curing agent and 2-5 parts of cosolvent.

[0037] The epoxy resin is a water-soluble epoxy resin emulsified based on bisphenol A epoxy resin, which can be ground together with the anti-rust pigment to improve the encapsulation performance of the anti-rust pigment and does not contain water itself.

[0038] The inorganic hybrid resin is nano-silicon dioxide hybrid epoxy resin.

[0039] The cosolvent is one or a mixture of ethylene glycol methyl ether, ethylene glycol ethyl ether, diethylene glycol ethyl ether, diethylene glycol methyl ether, propylene glycol methyl ether, dipropylene glycol methyl ether and the like.

[0040] The zinc powder is high-purity spherical zinc powder, the metal zinc content in the zinc powder is ≥99%, and the particle size of the zinc powder is 500 mesh-800 mesh.

[0041] Anti-settling aids are materials such as polyamide wax liquid, fumed silica, bentonite, etc. that can increase thixotropy in the coating and increase the coating's anti-settling, anti-sagging and other properties. One or more types can be used in combination.

[0042] The water-absorbing material is a molecular sieve, which is mainly used to absorb trace moisture in the coating to prevent hydrogen evolution reaction between zinc powder and water during storage. The particle size is controlled below 30μm.

[0043] The materials in component A must not contain moisture.

[0044] A method for preparing a long-acting protective material for bioengineering equipment comprises the following steps:

[0045] S1. Add 70-90 parts of zinc powder to a paint mixing tank with a cooling device, then add 8-15 parts of an environmentally friendly solvent, and stir at a low speed of 300-500 rpm to fully wet the zinc powder;

[0046] S2. Slowly add 3-5 parts of inorganic hybrid resin and 0.2-0.5 parts of silane coupling agent to the wetted zinc powder under stirring, increase the speed to 800-1000 rpm, and continue stirring for 10-20 minutes to form a combination of the hybrid resin and the zinc powder to obtain pretreated zinc powder;

[0047] S3, 8-10 parts of epoxy resin, 1-2 parts of wetting dispersant, and 0.1-0.3 parts of defoamer are put into a paint mixing tank with a cooling device in proportion, stirred at 500-600 rpm for 10 minutes, and then 0.5-1 parts of anti-settling agent are slowly added, stirred and dispersed into a slurry to form a resin slurry, and then slowly added to the pretreated zinc powder prepared in step S2 under stirring, and stirred at 1500-2000 rpm for 15-20 minutes;

[0048] S4, reduce the speed to 800-1000rpm, add 0.1-0.2 parts of defoamer and 0.5-1 parts of rheological additive, continue stirring for 15 minutes, then reduce the speed to 500-600rpm, add 0.1-0.3 parts of water-absorbing molecular sieve, and package for standby use;

[0049] S5. Dilute 1.5-3 parts of epoxy curing agent with 2-5 parts of co-solvent and package for later use.

[0050] The cooling device in S3 controls the temperature of the resin slurry inside the paint mixing tank to be lower than 55°C.

[0051] Embodiment 2:

[0052] Preparation of component A:

[0053] Add 90 parts of zinc powder and 15 parts of PM cosolvent to a paint mixing tank with a cooling device, stir at 500 rpm for 10 minutes; continue stirring for 10 minutes, then add 5 parts of nano-silica hybrid epoxy resin and 0.5 parts of silane coupling agent to the tank, increase the speed to 800 rpm, and continue stirring for 20 minutes;

[0054] Put 10 parts of epoxy resin, 2 parts of wetting dispersant and 0.3 parts of defoamer in proportion into a paint mixing tank with a cooling device, stir at 500 rpm for 10 minutes, then slowly add 1 part of anti-settling agent, stir and disperse into a slurry, then slowly add it to the pretreated zinc powder prepared in the above step under stirring, and stir at 2000 rpm for 15 minutes; reduce the speed to 800 rpm, add 0.2 parts of defoamer and 0.8 parts of rheological additive, continue stirring for 15 minutes, then reduce the speed to 500 rpm, add 0.3 parts of water-absorbing molecular sieve, stir for 10 minutes, and package for use.

[0055] During the preparation process, the cooling system must operate normally to ensure that the temperature of the slurry in the tank is lower than 55°C.

[0056] Preparation of component B:

[0057] Dilute 3 parts of epoxy curing agent with 5 parts of co-solvent and package for later use.

[0058] Embodiment 3:

[0059] Preparation of Component A

[0060] Add 80 parts of zinc powder and 10 parts of PM cosolvent to a paint mixing tank with a cooling device, stir at 500 rpm for 10 minutes; continue stirring for 10 minutes, then add 5 parts of nano-silica hybrid epoxy resin and 0.5 parts of silane coupling agent to the tank, increase the speed to 800 rpm, and continue stirring for 20 minutes;

[0061] Put 10 parts of epoxy resin, 1 part of wetting dispersant, and 0.2 parts of defoamer in a proportion into a paint mixing tank with a cooling device, stir at 500 rpm for 10 minutes, then slowly add 0.8 parts of anti-settling agent, stir and disperse into a slurry, then slowly add it to the pretreated zinc powder prepared in the above step under stirring, and stir at 2000 rpm for 15 minutes; reduce the speed to 800 rpm, add 0.2 parts of defoamer and 0.5 parts of rheological additive, continue stirring for 15 minutes, then reduce the speed to 500 rpm, add 0.3 parts of water-absorbing molecular sieve, stir for 10 minutes, and package for use.

[0062] During the preparation process, the cooling system must operate normally to ensure that the temperature of the slurry in the tank is lower than 55°C.

[0063] Preparation of component B:

[0064] Dilute 3 parts of epoxy curing agent with 5 parts of co-solvent and package for later use.

[0065] Embodiment 4:

[0066] Epoxy resin is used alone without adding inorganic hybrid resin, and the other components are the same as those in Example 1.

[0067] Preparation of component A:

[0068] Put 8 parts of epoxy resin, 8 parts of PM cosolvent, 1 part of wetting dispersant and 0.1 part of defoamer into a paint mixing tank with a cooling device in proportion, stir at 500 rpm for 10 minutes, then slowly add 0.5 parts of anti-settling agent, stir and disperse into slurry, then slowly add 70 parts of zinc powder while stirring, stir at 1500 rpm for 15 minutes; reduce the speed to 800 rpm, add 0.2 parts of defoamer, 0.2 parts of silane coupling agent and 0.5 parts of rheological additive, continue stirring for 15 minutes, then reduce the speed to 500 rpm, add 0.2 parts of water-absorbing molecular sieve, stir for 10 minutes, and package for use.

[0069] During the preparation process, the cooling system must operate normally to ensure that the temperature of the slurry in the tank is lower than 55°C.

[0070] Preparation of component B:

[0071] Dilute 1.5 parts of epoxy curing agent with 2 parts of co-solvent and package for later use.

[0072] Embodiment 5:

[0073] Epoxy resin is used alone, zinc powder is added to the curing agent, and the remaining components are the same as in Example 1.

[0074] Preparation of Component A

[0075] Put 8 parts of epoxy resin, 8 parts of PM cosolvent, 1 part of wetting dispersant and 0.1 parts of defoamer into a paint mixing tank with a cooling device in proportion, stir at 500 rpm for 10 minutes, then slowly add 0.5 parts of anti-settling agent, stir and disperse into a slurry, add 0.5 parts of rheological additive, continue stirring for 15 minutes, and package for later use.

[0076] Preparation of component B:

[0077] Add 30 parts of PM cosolvent into the checkers tank, add 1.5 parts of epoxy curing agent, stir at 500rpm for 10min, add 0.5 parts of anti-settling agent, increase the speed to 1000rpm, slowly add 70 parts of zinc powder while stirring, increase the speed to 2000rpm, continue stirring for 20min, reduce the speed to 1000rpm, add 0.2 parts of defoaming agent, 0.2 parts of silane coupling agent, stir for 15min; then reduce the speed to 500rpm, add 0.2 parts of water-absorbing molecular sieve, stir for 10min, and package for use.

[0078] During the preparation process, the cooling system must operate normally to ensure that the temperature of the slurry in the tank is lower than 55°C.

[0079] The above is only a preferred specific implementation manner of the present invention; but the protection scope of the present invention is not limited thereto; any technician familiar with the technical field within the technical scope disclosed by the present invention; any equivalent replacement or change based on the technical solution and improved concept of the present invention shall be covered by the protection scope of the present invention.

Claims

1. A long-term protective material for bioengineering equipment, characterized in that: The invention comprises component A and component B. Component A mainly consists of 8-10 parts of epoxy resin, 3-5 parts of inorganic hybrid resin, 70-90 parts of zinc powder, 0.5-1 parts of anti-settling agent, 1-2 parts of wetting dispersant, 0.5-1 parts of rheological agent, 0.2-0.5 parts of defoaming agent, 0.1-0.3 parts of water-absorbing material, 8-15 parts of cosolvent and 0.2-0.5 parts of silane coupling agent. Component B mainly consists of 1.5-3 parts of epoxy curing agent and 2-5 parts of cosolvent.

2. The long-acting protective material for bioengineering equipment according to claim 1, characterized in that: The epoxy resin is a water-soluble epoxy resin based on bisphenol A epoxy resin internal emulsification, which can be ground together with the anti-rust pigment to improve the encapsulation performance of the anti-rust pigment and does not contain water itself.

3. According to claim 1, a long-acting protective material for bioengineering equipment and a preparation method thereof, characterized in that: The inorganic hybrid resin is nano-silicon dioxide hybrid epoxy resin.

4. The long-acting protective material for bioengineering equipment according to claim 1, characterized in that: The cosolvent is one or a mixture of ethylene glycol methyl ether, ethylene glycol ethyl ether, diethylene glycol ethyl ether, diethylene glycol methyl ether, propylene glycol methyl ether, dipropylene glycol methyl ether and the like.

5. The long-acting protective material for bioengineering equipment according to claim 1, characterized in that: The zinc powder is high-purity spherical zinc powder, the metal zinc content in the zinc powder is ≥99%, and the particle size of the zinc powder is 500-800 meshes.

6. The long-acting protective material for bioengineering equipment according to claim 1, characterized in that: The anti-settling aid is a material such as polyamide wax liquid, fumed silica, bentonite, etc., which can increase the thixotropy of the coating and increase the anti-settling and anti-sagging properties of the coating. One or more kinds of the materials can be used in combination.

7. The long-acting protective material for bioengineering equipment according to claim 1, characterized in that: The water-absorbing material is a molecular sieve, which is mainly used to absorb trace moisture in the coating to prevent hydrogen evolution reaction between zinc powder and water during storage, and the particle size is controlled below 30 μm.

8. The long-acting protective material for bioengineering equipment according to claim 1, characterized in that: The materials in the A component must not contain moisture.

9. A method for preparing a long-acting protective material for bioengineering equipment according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Add 70-90 parts of zinc powder to a paint mixing tank with a cooling device, then add 8-15 parts of an environmentally friendly solvent, and stir at a low speed of 300-500 rpm to fully wet the zinc powder; S2. Slowly add 3-5 parts of inorganic hybrid resin and 0.2-0.5 parts of silane coupling agent to the wetted zinc powder under stirring, increase the speed to 800-1000 rpm, and continue stirring for 10-20 minutes to form a combination of the hybrid resin and the zinc powder to obtain pretreated zinc powder; S3, 8-10 parts of epoxy resin, 1-2 parts of wetting dispersant, and 0.1-0.3 parts of defoamer are put into a paint mixing tank with a cooling device in proportion, stirred at 500-600 rpm for 10 minutes, and then 0.5-1 parts of anti-settling agent are slowly added, stirred and dispersed into a slurry to form a resin slurry, and then slowly added to the pretreated zinc powder prepared in step S2 under stirring, and stirred at 1500-2000 rpm for 15-20 minutes; S4, reduce the speed to 800-1000rpm, add 0.1-0.2 parts of defoamer and 0.5-1 parts of rheological additive, continue stirring for 15 minutes, then reduce the speed to 500-600rpm, add 0.1-0.3 parts of water-absorbing molecular sieve, and package for standby use; S5. Dilute 1.5-3 parts of epoxy curing agent with 2-5 parts of co-solvent and package for later use.

10. A long-acting protective material for bioengineering equipment and a preparation method thereof according to claim 9, characterized in that: The cooling device in S3 controls the temperature of the resin slurry inside the paint mixing tank to be lower than 55°C.

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