Corrosion-resistant synthetic resin and preparation method thereof

Abstract

The invention discloses corrosion-resistant synthetic resin and a preparation method thereof, and the corrosion-resistant synthetic resin comprises the following raw materials in parts by weight: 40-60 parts of bisphenol A epoxy resin, 20-30 parts of novolac epoxy resin, 8-15 parts of a curing agent, 5-12 parts of a corrosion-resistant modifier, 3-8 parts of a reinforcing filler, 2-5 parts of a diluent, 1-3 parts of an antioxidant and 0.5-2 parts of a defoaming agent. According to the corrosion-resistant synthetic resin and the preparation method thereof, the bisphenol A epoxy resin and the novolac epoxy resin are reasonably matched to serve as resin matrixes, and the corrosion-resistant modifier formed by compounding the organosilane modified montmorillonite and the fluororubber powder is combined, so that the corrosion resistance of the synthetic resin is synergistically improved; the organosilane modified montmorillonite forms a lamellar barrier structure in a resin matrix, so that permeation of a corrosive medium can be effectively hindered; the fluorine rubber powder has excellent chemical corrosion resistance stability, and the fluorine rubber powder and the fluorine rubber powder have a synergistic effect, so that the resin can resist long-term corrosion of strong corrosion media such as strong acid, strong alkali and high-concentration saline solution.

Description

Technical Field

[0001] This invention relates to the field of synthetic resin technology, specifically to a corrosion-resistant synthetic resin and its preparation method. Background Technology

[0002] Synthetic resins are a class of artificially synthesized polymer compounds with excellent properties such as light weight, high strength, and easy processing. They are widely used in many fields such as chemical industry, construction, electronics, and automobiles. In the acid and alkaline environment of the chemical industry, the salt spray environment of marine engineering, and the humid and corrosive environment of daily use, extremely high requirements are placed on the corrosion resistance of synthetic resins.

[0003] Existing synthetic resins, such as epoxy resins and polyurethane resins, while exhibiting good performance under normal conditions, are prone to surface cracking, swelling, and degradation under prolonged exposure to highly corrosive media (such as strong acids, strong alkalis, and high-concentration salt solutions). This leads to a decline in their mechanical properties and a shortened service life, failing to meet the demands of harsh corrosive environments. To improve the corrosion resistance of synthetic resins, existing technologies typically employ the addition of corrosion-resistant fillers or resin modification. However, these methods have the following drawbacks: Firstly, a large amount of corrosion-resistant filler can reduce the resin's processing fluidity, increasing molding difficulty and potentially affecting its mechanical strength. Secondly, traditional modification processes are complex and costly, and the improvement in corrosion resistance after modification is limited, making it difficult to adapt to long-term, highly corrosive environments. Therefore, there is an urgent need to provide a corrosion-resistant synthetic resin and its preparation method to address the aforementioned problems. Summary of the Invention

[0004] The purpose of this invention is to provide a corrosion-resistant synthetic resin and its preparation method, so as to solve the problems of insufficient corrosion resistance and complex preparation process of synthetic resins in the prior art mentioned in the background.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a corrosion-resistant synthetic resin, comprising, by weight, 40-60 parts of bisphenol A epoxy resin, 20-30 parts of phenolic epoxy resin, 8-15 parts of curing agent, 5-12 parts of corrosion-resistant modifier, 3-8 parts of reinforcing filler, 2-5 parts of diluent, 1-3 parts of antioxidant, and 0.5-2 parts of defoamer.

[0006] Preferably, the bisphenol A epoxy resin has an epoxy value of 0.45-0.55 eq / 100g and a softening point of 64-70℃. Using bisphenol A epoxy resin with these parameters ensures that the resin has good crosslinking density and basic mechanical properties. The phenolic epoxy resin has an epoxy value of 0.50-0.60 eq / 100g and a viscosity of 1500-2500 mPa·s at 25℃. The addition of phenolic epoxy resin can improve the crosslinking degree of the resin and its high temperature resistance and corrosion resistance.

[0007] Preferably, the curing agent is an amine curing agent, selected from one or more of 4,4'-diaminodiphenyl sulfone, m-phenylenediamine, and diaminodiphenylmethane, with 4,4'-diaminodiphenyl sulfone being preferred. It has good compatibility with epoxy resin, and the crosslinking structure of the resin after curing is stable, with excellent corrosion resistance.

[0008] Preferably, the corrosion-resistant modifier is a composite of organosilane-modified montmorillonite and fluororubber powder, wherein the weight ratio of organosilane-modified montmorillonite to fluororubber powder is 1:2-3.

[0009] Preferably, the organosilane-modified montmorillonite is γ-aminopropyltriethoxysilane-modified montmorillonite, with an interlayer spacing of 1.5-2.0 nm. After organosilane modification, the compatibility of montmorillonite is significantly improved, allowing it to be uniformly dispersed in the resin matrix to form a barrier layer that hinders the penetration of corrosive media. The fluororubber powder has a particle size of 50-100 μm. Fluororubber has excellent chemical corrosion resistance, which can further improve the overall corrosion resistance of the resin.

[0010] Preferably, the reinforcing filler is glass fiber powder or carbon fiber powder with a particle size of 100-200μm. The addition of the reinforcing filler can improve the mechanical strength of the resin and avoid the decline in mechanical properties caused by corrosion. The diluent is an active diluent selected from one of propylene oxide butyl ether and ethylene glycol diglycidyl ether. The active diluent can reduce the viscosity of the resin system, improve the processing fluidity, and participate in the curing reaction without affecting the performance of the resin.

[0011] Preferably, the antioxidant is a hindered phenolic antioxidant, selected from antioxidant 1010 and antioxidant 1076, which can effectively delay the oxidative aging of the resin and improve its service life; the defoamer is an organosilicon defoamer, selected from dimethyl silicone oil and polyether modified silicone oil, which can eliminate bubbles generated during the resin preparation process, ensure the density of the resin after molding, and prevent bubbles from becoming channels for the penetration of corrosive media.

[0012] Preferably, the specific manufacturing steps of the corrosion-resistant synthetic resin are as follows: Step 1: Pretreatment: Mix organosilane-modified montmorillonite and fluororubber powder at a weight ratio of 1:2-3, add to a high-speed mixer, and mix for 30-40 minutes at 80-90℃ and 1500-2000 r / min to obtain a corrosion-resistant modifier; place the reinforcing filler in an oven and dry at 120-130℃ for 2-3 hours to remove moisture, and set aside for later use; Step 2: Premixing: Add bisphenol A epoxy resin and phenolic epoxy resin to the reactor, heat to 70-80℃, stir at 500-800 r / min for 15-20 min to ensure that the two resins are fully mixed and homogeneous, add diluent and continue stirring for 10-15 min to obtain resin matrix mixture. Step 3: Modification and mixing: Add the pretreated corrosion-resistant modifier, reinforcing filler, antioxidant and defoamer to the resin matrix mixture, heat to 90-100℃, and stir at 1000-1200r / min for 40-60min to ensure that the components are evenly dispersed in the resin matrix. Step 4: Curing and molding: Add curing agent to the mixture obtained in step 3, stir for 20-30 minutes at 90-100℃ and 800-1000r / min, pour into mold after mixing evenly, cure at 120℃ for 2 hours and at 150℃ for 3 hours in sequence, and demold after cooling to room temperature to obtain corrosion-resistant synthetic resin product.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1) The corrosion-resistant synthetic resin and its preparation method, by rationally combining bisphenol A epoxy resin and phenolic epoxy resin as resin matrices, and combining a corrosion-resistant modifier composed of organosilane-modified montmorillonite and fluororubber powder, synergistically improve the corrosion resistance of the synthetic resin; organosilane-modified montmorillonite forms a lamellar barrier structure in the resin matrix, which can effectively prevent the penetration of corrosive media; fluororubber powder has excellent chemical corrosion resistance and stability. The synergistic effect of the two enables the resin to withstand long-term erosion by strong corrosive media such as strong acids, strong alkalis, and high-concentration salt solutions. 2) The corrosion-resistant synthetic resin and its preparation method, with the addition of reinforcing fillers and the combination of optimized curing process, enable the synthetic resin to maintain good mechanical properties while possessing excellent corrosion resistance, and can meet the requirements of different application scenarios for the mechanical properties of the resin. 3) The corrosion-resistant synthetic resin and its preparation method have a simple preparation process, easy-to-control parameters in each step, no need for complex special equipment, controllable production costs, and are suitable for large-scale industrial production; at the same time, the use of reactive diluents improves the processing fluidity of the resin system, avoids the molding difficulties caused by adding a large amount of filler, and improves production efficiency. 4) The addition of antioxidants and defoamers to this corrosion-resistant synthetic resin and its preparation method not only delays the oxidative aging of the resin and extends its service life, but also ensures the density of the resin after molding, avoids the decline in corrosion resistance caused by bubble defects, and further improves the overall performance stability of the resin. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0015] Example 1: A corrosion-resistant synthetic resin, by weight, comprises the following raw materials: 40 parts bisphenol A epoxy resin, 20 parts phenolic epoxy resin, 8 parts 4,4'-diaminodiphenyl sulfone, 5 parts corrosion-resistant modifier, 3 parts reinforcing filler, 2 parts diluent, 1 part antioxidant, and 0.5 parts defoamer. The epoxy value of bisphenol A epoxy resin is 0.45 eq / 100g, and the softening point is 64℃; the epoxy value of phenolic epoxy resin is 0.50 eq / 100g, and the viscosity at 25℃ is 1500 mPa·s. The corrosion-resistant modifier is a composite of γ-aminopropyltriethoxysilane-modified montmorillonite and fluororubber powder, wherein the weight ratio of γ-aminopropyltriethoxysilane-modified montmorillonite to fluororubber powder is 1:2. The reinforcing filler is glass fiber powder with a particle size of 100μm. The addition of the reinforcing filler can improve the mechanical strength of the resin and avoid the decline in mechanical properties caused by corrosion. The diluent is propylene oxide butyl ether. The reactive diluent can reduce the viscosity of the resin system, improve the processing fluidity, and participate in the curing reaction without affecting the performance of the resin. The antioxidant is antioxidant 1010, which can effectively delay the oxidative aging of the resin and improve its service life; the defoamer is dimethyl silicone oil, which can eliminate the bubbles generated during the resin preparation process, ensure the compactness of the resin after molding, and prevent bubbles from becoming channels for the penetration of corrosive media. The specific manufacturing steps for corrosion-resistant synthetic resins are as follows: Step 1: Pretreatment: Mix γ-aminopropyltriethoxysilane modified montmorillonite with fluororubber powder at a weight ratio of 1:2, add to a high-speed mixer, and mix for 40 minutes at 80℃ and 1500 r / min to obtain a corrosion-resistant modifier; put glass fiber powder into an oven and dry at 120℃ for 3 hours to remove moisture, and set aside for later use. Step 2: Premixing: Add bisphenol A epoxy resin and phenolic epoxy resin to the reactor, heat to 70°C, stir at 500 r / min for 20 min to ensure that the two resins are fully mixed and homogeneous, add propylene oxide butyl ether and continue stirring for 15 min to obtain a resin matrix mixture. Step 3: Modification and mixing: Add the pretreated corrosion-resistant modifier, glass fiber powder, antioxidant 1010 and dimethyl silicone oil to the resin matrix mixture, heat to 90℃, and stir at 1000r / min for 60min to ensure that each component is evenly dispersed in the resin matrix. Step 4: Curing and molding: Add 4,4'-diaminodiphenyl sulfone to the mixture obtained in step 3, stir for 30 minutes at 90℃ and 800r / min, pour into a mold after mixing evenly, and cure at 120℃ for 2 hours and 150℃ for 3 hours in sequence. After cooling to room temperature, demold to obtain the corrosion-resistant synthetic resin product. Example 2: A corrosion-resistant synthetic resin, by weight, comprises the following raw materials: 50 parts bisphenol A epoxy resin, 25 parts phenolic epoxy resin, 12 parts m-phenylenediamine, 8 parts corrosion-resistant modifier, 5 parts reinforcing filler, 3 parts diluent, 2 parts antioxidant, and 1.2 parts defoamer. The epoxy value of bisphenol A epoxy resin is 0.50 eq / 100g, and the softening point is 67℃; the epoxy value of phenolic epoxy resin is 0.55 eq / 100g, and the viscosity at 25℃ is 2000 mPa·s. The corrosion-resistant modifier is a composite of γ-aminopropyltriethoxysilane-modified montmorillonite and fluororubber powder, wherein the weight ratio of γ-aminopropyltriethoxysilane-modified montmorillonite to fluororubber powder is 1:2.5. The reinforcing filler is carbon fiber powder with a particle size of 150μm. The addition of the reinforcing filler can improve the mechanical strength of the resin and avoid the decline in mechanical properties caused by corrosion. The diluent is ethylene glycol diglycidyl ether. The active diluent can reduce the viscosity of the resin system, improve the processing fluidity, and participate in the curing reaction without affecting the performance of the resin. The antioxidant is antioxidant 1076, which can effectively delay the oxidative aging of the resin and improve its service life; the defoamer is polyether modified silicone oil, which can eliminate bubbles generated during the resin preparation process, ensure the compactness of the resin after molding, and prevent bubbles from becoming channels for the penetration of corrosive media. The specific manufacturing steps for corrosion-resistant synthetic resins are as follows: Step 1: Pretreatment: Mix γ-aminopropyltriethoxysilane modified montmorillonite with fluororubber powder at a weight ratio of 1:2.5, add to a high-speed mixer, and mix for 35 minutes at 85℃ and 1800 r / min to obtain a corrosion-resistant modifier; place carbon fiber powder in an oven and dry at 125℃ for 2.5 hours to remove moisture, and set aside for later use; Step 2: Premixing: Add bisphenol A epoxy resin and phenolic epoxy resin to the reactor, heat to 75°C, stir at 650 r / min for 18 min to ensure that the two resins are fully mixed and homogeneous, add ethylene glycol diglycidyl ether and continue stirring for 12 min to obtain a resin matrix mixture. Step 3: Modification and mixing: Add the pretreated corrosion-resistant modifier, carbon fiber powder, antioxidant 1076 and polyether-modified silicone oil to the resin matrix mixture, heat to 95℃, and stir at 1100r / min for 50min to ensure that each component is evenly dispersed in the resin matrix. Step 4: Curing and molding: Add m-phenylenediamine to the mixture obtained in step 3, stir for 25 minutes at 95℃ and 900r / min, pour into a mold after mixing evenly, and cure at 120℃ for 2 hours and 150℃ for 3 hours in sequence. After cooling to room temperature, demold to obtain the corrosion-resistant synthetic resin product. Example 3: A corrosion-resistant synthetic resin, by weight, comprises the following raw materials: 60 parts bisphenol A epoxy resin, 30 parts phenolic epoxy resin, 15 parts diaminodiphenylmethane, 12 parts corrosion-resistant modifier, 8 parts reinforcing filler, 5 parts diluent, 3 parts antioxidant, and 2 parts defoamer. The epoxy value of bisphenol A epoxy resin is 0.55 eq / 100g, and the softening point is 70℃; the epoxy value of phenolic epoxy resin is 0.60 eq / 100g, and the viscosity at 25℃ is 2500 mPa·s. The corrosion-resistant modifier is a composite of γ-aminopropyltriethoxysilane-modified montmorillonite and fluororubber powder, wherein the weight ratio of γ-aminopropyltriethoxysilane-modified montmorillonite to fluororubber powder is 1:3. The reinforcing filler is glass fiber powder with a particle size of 200μm. The addition of the reinforcing filler can improve the mechanical strength of the resin and avoid the decline in mechanical properties caused by corrosion. The diluent is propylene oxide butyl ether. The reactive diluent can reduce the viscosity of the resin system, improve the processing fluidity, and participate in the curing reaction without affecting the performance of the resin. The antioxidant is antioxidant 1010, which can effectively delay the oxidative aging of the resin and improve its service life; the defoamer is dimethyl silicone oil, which can eliminate the bubbles generated during the resin preparation process, ensure the compactness of the resin after molding, and prevent bubbles from becoming channels for the penetration of corrosive media. The specific manufacturing steps for corrosion-resistant synthetic resins are as follows: Step 1: Pretreatment: Mix γ-aminopropyltriethoxysilane modified montmorillonite with fluororubber powder at a weight ratio of 1:3, add to a high-speed mixer, and mix for 30 minutes at 90℃ and 2000 r / min to obtain a corrosion-resistant modifier; put glass fiber powder into an oven and dry at 130℃ for 2 hours to remove moisture, and set aside for later use. Step 2: Premixing: Add bisphenol A epoxy resin and phenolic epoxy resin to the reactor, heat to 80°C, stir at 800 r / min for 15 min to ensure that the two resins are fully mixed and homogeneous, add propylene oxide butyl ether and continue stirring for 10 min to obtain a resin matrix mixture. Step 3: Modification and mixing: Add the pretreated corrosion-resistant modifier, glass fiber powder, antioxidant 1010 and dimethyl silicone oil to the resin matrix mixture, heat to 100℃, and stir at 1200r / min for 40min to ensure that each component is evenly dispersed in the resin matrix. Step 4: Curing and molding: Add diaminodiphenylmethane to the mixture obtained in step 3, stir for 20 minutes at 100℃ and 1000r / min, pour into a mold after mixing evenly, and cure at 120℃ for 2 hours and 150℃ for 3 hours in sequence. After cooling to room temperature, demold to obtain the corrosion-resistant synthetic resin product.

[0016] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0017] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A corrosion-resistant synthetic resin, characterized in that: By weight, the raw material composition includes: 40-60 parts of bisphenol A epoxy resin, 20-30 parts of phenolic epoxy resin, 8-15 parts of curing agent, 5-12 parts of corrosion-resistant modifier, 3-8 parts of reinforcing filler, 2-5 parts of diluent, 1-3 parts of antioxidant, and 0.5-2 parts of defoamer.

2. The corrosion-resistant synthetic resin according to claim 1, characterized in that: The bisphenol A epoxy resin has an epoxy value of 0.45-0.55 eq / 100g and a softening point of 64-70℃; the phenolic epoxy resin has an epoxy value of 0.50-0.60 eq / 100g and a viscosity of 1500-2500 mPa·s at 25℃.

3. The corrosion-resistant synthetic resin according to claim 1, characterized in that: The curing agent is an amine curing agent, selected from one or more mixtures of 4,4'-diaminodiphenyl sulfone, m-phenylenediamine, and diaminodiphenylmethane.

4. The corrosion-resistant synthetic resin according to claim 1, characterized in that: The corrosion-resistant modifier is a composite of organosilane-modified montmorillonite and fluororubber powder, wherein the weight ratio of organosilane-modified montmorillonite to fluororubber powder is 1:2-3.

5. The corrosion-resistant synthetic resin according to claim 4, characterized in that: The organosilane-modified montmorillonite is γ-aminopropyltriethoxysilane-modified montmorillonite, and the interlayer spacing of the montmorillonite is 1.5-2.0 nm; the particle size of the fluororubber powder is 50-100 μm.

6. The corrosion-resistant synthetic resin according to claim 1, characterized in that: The reinforcing filler is glass fiber powder or carbon fiber powder with a particle size of 100-200μm; the diluent is an active diluent selected from propylene oxide butyl ether and ethylene glycol diglycidyl ether.

7. The corrosion-resistant synthetic resin according to claim 1, characterized in that: The antioxidant is a hindered phenolic antioxidant, selected from antioxidant 1010 and antioxidant 1076; the defoamer is an organosilicon defoamer, selected from dimethyl silicone oil and polyether modified silicone oil.

8. A method for preparing a corrosion-resistant synthetic resin as described in any one of claims 1-6, characterized in that: The specific manufacturing steps of the corrosion-resistant synthetic resin are as follows: Step 1: Pretreatment: Mix organosilane-modified montmorillonite and fluororubber powder at a weight ratio of 1:2-3, and mix for 30-40 minutes at 80-90℃ and 1500-2000 r / min to obtain a corrosion-resistant modifier; dry the reinforcing filler at 120-130℃ for 2-3 hours for later use. Step 2: Premixing: Add bisphenol A epoxy resin and phenolic epoxy resin to the reactor, heat to 70-80℃, stir at 500-800 r / min for 15-20 min, add diluent and continue stirring for 10-15 min to obtain resin matrix mixture. Step 3: Modification and mixing: Add the pretreated corrosion-resistant modifier, reinforcing filler, antioxidant and defoamer to the resin matrix mixture, heat to 90-100℃, and stir at 1000-1200r / min for 40-60min. Step 4: Curing and molding: Add curing agent and stir for 20-30 minutes at 90-100℃ and 800-1000r / min. After mixing evenly, pour into the mold and cure at 120℃ for 2 hours and 150℃ for 3 hours in sequence. After cooling to room temperature, demold to obtain the finished product.