Foam plastic binder for lost foam casting of marine engineering dredge pumps

Abstract

The application discloses a foamed plastic binder for an expendable pattern casting of a marine engineering dredging pump and relates to the casting technical field.The foamed plastic binder is prepared from acrylate monomer, styrene, hydrophilic monomer, 1-allyl hydantoin, emulsifier, initiator and deionized water.The foamed plastic binder has high bonding strength, no corrosion to the foamed plastic, high flexibility of the glue layer formed after solidification, low decomposition and gasification temperature, little residue after gasification, and can avoid quality defects such as air holes and slag inclusion of the casting caused by the use of the binder.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of casting technology, in particular to a foamed plastic binder for ocean engineering dredge pump lost foam casting. BACKGROUND

[0002] The rapid economic development of the eastern coastal cities in China is inseparable from the development of the port. The city is developed with the port, and the city is developed with the port. The expansion of urban land and the expansion of the port require river port dredging and reclamation to create islands, resulting in a large amount of fill soil. At the same time, the large-scale of ships will inevitably lead to the deepening of the waterway. Dredging is a necessary way to solve the safe navigation of ships and the foundation construction of ports and waterways. At present, the problem to be solved in dredging is the low service life of the dredge pump. Part of the reason is that the performance of the casting material is not good enough to meet the requirements of ocean engineering for the wear resistance and corrosion resistance of the dredge pump. Another reason is that the casting process has defects such as gas hole, shrinkage hole, sand eye, sand sticking, and sand inclusion.

[0003] Lost foam casting, also known as full mold casting, is a new type of casting method in which a wax or foam model similar in size and shape to the casting is bonded and combined into a model cluster, coated with refractory paint and dried, then buried in dry quartz sand and vibrated to form a mold. Under negative pressure, the model is gasified, the liquid metal occupies the position of the model, and the casting is formed after solidification and cooling. The foam model is generally polystyrene foam, which needs to be bonded with a binder to form a casting mold with a specific structure. Although the amount of binder used in lost foam casting production is not large, it is indispensable. The use effect of the binder (bonding strength, gas evolution, and gasification residue) directly affects the quality of the casting. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a foamed plastic binder for ocean engineering dredge pump lost foam casting. On the one hand, the present application prepares a water-based binder by adding a hydrophilic monomer during polymerization. On the other hand, the present application improves the bonding strength of the binder by adding 1-allyl hydantoin during polymerization, thereby optimizing the use effect and environmental friendliness of the binder and minimizing the adverse effects of the binder on the quality of the casting.

[0005] The technical problem to be solved by the present application is solved by the following technical solution:

[0006] The first object of the present application is to provide a foamed plastic binder prepared from acrylate monomer, styrene, hydrophilic monomer, 1-allyl hydantoin, emulsifier, initiator, and deionized water.

[0007] Preferably, the solid content of the foamed plastic binder is 45-55wt%. The amount of deionized water is controlled according to the solid content.

[0008] Preferably, the mass ratio of the acrylic ester monomer, styrene, hydrophilic monomer, 1-allyl hydantoin, emulsifier, initiator is (20-30):(5-15):(1-10):(1-10):(0.5-5):(0.05-2).

[0009] The present application improves the bonding strength of the adhesive to the foam by adding 1-allyl hydantoin as a comonomer, and the residue after the adhesive is vaporized is very little, effectively reducing the adverse effect on the quality of the cast.

[0010] Preferably, the acrylic ester monomer is at least one of methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, and butyl methacrylate.

[0011] Preferably, the hydrophilic monomer is at least one of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, acrylic acid, methacrylic acid, acrylamide, methacrylamide, and N-methylol acrylamide.

[0012] The present application prepares a water-based adhesive by adding a hydrophilic monomer as a comonomer, which not only reduces the cost of solvent, but also improves the environmental friendliness of the adhesive.

[0013] Preferably, the emulsifier is at least one of alkyl sulfonate, sodium alkyl benzene sulfonate, alkyl phenol polyoxyethylene ether, polyethylene glycol, and polyvinyl alcohol.

[0014] Preferably, the initiator is an inorganic peroxide initiator or an azo initiator.

[0015] Further preferably, the inorganic peroxide initiator is at least one of potassium persulfate, ammonium persulfate, and sodium persulfate.

[0016] Further preferably, the azo initiator is at least one of azobis isobutyronitrile and azobis isohexyl nitrile.

[0017] The second object of the present application is to provide a preparation method of the foam plastic adhesive, which comprises adding 1 / 2 emulsifier and 1 / 2 initiator into deionized water, stirring and dissolving, then adding acrylic ester monomer, styrene, hydrophilic monomer, and 1-allyl hydantoin, stirring and reacting, adding the remaining 1 / 2 emulsifier and 1 / 2 initiator, continuing to stir and react, filtering after the reaction is completed, and obtaining the adhesive.

[0018] Preferably, the stirring and dissolving and the stirring and reacting can be carried out under heating conditions.

[0019] The third object of the present application is to provide the use of the foamed plastic binder in the lost foam casting of marine engineering dredging pump. Of course, the foamed plastic binder of the present application is also suitable for the lost foam casting of other casting products.

[0020] The beneficial effects of the present application are:

[0021] 1. The foamed plastic binder of the present application belongs to water-based binder, which will not volatilize organic solvents during the curing process, has strong environmental protection, low solvent cost, avoids the use of large amounts of organic solvents and the environmental pollution caused by the volatilization of organic solvents during the curing process.

[0022] 2. The foamed plastic binder of the present application not only has high bonding strength, no corrosion to foamed plastic, and strong flexibility of the formed adhesive layer after curing, but also has low decomposition and gasification temperature, and little residue after gasification, thereby avoiding the quality defects such as pores and slag inclusion in the castings caused by the use of the binder. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, purposes and effects achieved by the present application easy to understand, the present application is further described below in combination with specific embodiments.

[0024] Example 1

[0025] First, 0.3 parts of alkylphenol polyoxyethylene ether OP-10 and 0.05 parts of potassium persulfate were added to deionized water, heated to 55℃ and stirred to dissolve, then 15 parts of methyl methacrylate, 10 parts of ethyl acrylate, 10 parts of styrene, 5 parts of hydroxyethyl acrylate and 5 parts of 1-allyl hydantoin were added, heated to 80℃ and stirred to react, then 0.3 parts of alkylphenol polyoxyethylene ether OP-10 and 0.05 parts of potassium persulfate were added, and the reaction was continued at 80℃ under stirring, after the reaction was completed, filtration was carried out, and a binder with a solid content of 50wt% was obtained.

[0026] Example 2

[0027] First, 0.25 parts of polyvinyl alcohol 1788 and 0.1 parts of azobisisobutyronitrile were added to deionized water, heated to 50℃ and stirred to dissolve, then 15 parts of methyl methacrylate, 15 parts of butyl acrylate, 15 parts of styrene, 5 parts of hydroxypropyl acrylate and 4 parts of 1-allyl hydantoin were added, heated to 85℃ and stirred to react, then 0.25 parts of secondary alkyl sulfonate SAS-60 and 0.1 parts of azobisisobutyronitrile were added, and the reaction was continued at 85℃ under stirring, after the reaction was completed, filtration was carried out, and a binder with a solid content of 48wt% was obtained.

[0028] Example 3

[0029] First, 0.25 parts of alkylphenol polyoxyethylene ether OP-10 and 0.05 parts of potassium persulfate were added to deionized water, heated to 60°C and stirred to dissolve, then 25 parts of methyl methacrylate, 12 parts of styrene, 4 parts of acrylic acid and 5 parts of 1-allyl hydantoin were added, heated to 80°C and stirred to react, then 0.25 parts of sodium dodecylbenzenesulfonate and 0.05 parts of potassium persulfate were added, and the reaction was continued at 80°C, after which the reaction was filtered to obtain a binder with a solid content of 55wt%.

[0030] Example 4

[0031] First, 0.25 parts of alkylphenol polyoxyethylene ether OP-10 and 0.05 parts of potassium persulfate were added to deionized water, heated to 60°C and stirred to dissolve, then 25 parts of methyl methacrylate, 12 parts of styrene, 4 parts of acrylic acid and 5 parts of 1-allyl hydantoin were added, heated to 80°C and stirred to react, then 0.25 parts of sodium dodecylbenzenesulfonate and 0.05 parts of potassium persulfate were added, and the reaction was continued at 80°C, after which the reaction was filtered to obtain a binder with a solid content of 55wt%.

[0032] Example 5

[0033] First, 0.25 parts of alkylphenol polyoxyethylene ether OP-10 and 0.05 parts of potassium persulfate were added to deionized water, heated to 60°C and stirred to dissolve, then 25 parts of methyl methacrylate, 12 parts of styrene, 4 parts of acrylic acid and 5 parts of 1-allyl hydantoin were added, heated to 80°C and stirred to react, then 0.25 parts of sodium dodecylbenzenesulfonate and 0.05 parts of potassium persulfate were added, and the reaction was continued at 80°C, after which the reaction was filtered to obtain a binder with a solid content of 55wt%.

[0034] Comparative Example 1

[0035] Comparative Example 1 is only a replacement of 1-allyl hydantoin in Example 1 with acrylamide, and the rest of the preparation conditions are the same as those in Example 1.

[0036] First, 0.25 parts of alkylphenol polyoxyethylene ether OP-10 and 0.05 parts of potassium persulfate were added to deionized water, heated to 60°C and stirred to dissolve, then 25 parts of methyl methacrylate, 12 parts of styrene, 4 parts of acrylic acid and 5 parts of 1-allyl hydantoin were added, heated to 80°C and stirred to react, then 0.25 parts of sodium dodecylbenzenesulfonate and 0.05 parts of potassium persulfate were added, and the reaction was continued at 80°C, after which the reaction was filtered to obtain a binder with a solid content of 55wt%.

[0037] Comparative Example 2

[0038] Comparative Example 2 is the same as Example 1 except that 1-allylhydantoin is deleted and the amount of 1-allylhydantoin is added to methyl methacrylate.

[0039] First, 0.3 parts of alkylphenol polyoxyethylene ether OP-10 and 0.05 parts of potassium persulfate were added to deionized water, heated to 55°C and stirred to dissolve, then 20 parts of methyl methacrylate, 10 parts of ethyl acrylate, 10 parts of styrene and 5 parts of hydroxyethyl acrylate were added, heated to 80°C and stirred to react, then 0.3 parts of alkylphenol polyoxyethylene ether OP-10 and 0.05 parts of potassium persulfate were added, and the reaction was continued at 80°C, after the reaction was completed, filtration was carried out, and a binder with a solid content of 50wt% was obtained.

[0040] Comparative Example 3

[0041] Comparative Example 3 is the same as Example 1 except that 1-allylhydantoin is deleted and the amount of 1-allylhydantoin is added to styrene.

[0042] First, 0.3 parts of alkylphenol polyoxyethylene ether OP-10 and 0.05 parts of potassium persulfate were added to deionized water, heated to 55°C and stirred to dissolve, then 20 parts of methyl methacrylate, 10 parts of ethyl acrylate, 10 parts of styrene and 5 parts of hydroxyethyl acrylate were added, heated to 80°C and stirred to react, then 0.3 parts of alkylphenol polyoxyethylene ether OP-10 and 0.05 parts of potassium persulfate were added, and the reaction was continued at 80°C, after the reaction was completed, filtration was carried out, and a binder with a solid content of 50wt% was obtained.

[0043] Comparative Example 4

[0044] Comparative Example 4 is the same as Example 1 except that 1-allylhydantoin is deleted.

[0045] First, 0.3 parts of alkylphenol polyoxyethylene ether OP-10 and 0.05 parts of potassium persulfate were added to deionized water, heated to 55°C and stirred to dissolve, then 20 parts of methyl methacrylate, 10 parts of ethyl acrylate, 10 parts of styrene and 5 parts of hydroxyethyl acrylate were added, heated to 80°C and stirred to react, then 0.3 parts of alkylphenol polyoxyethylene ether OP-10 and 0.05 parts of potassium persulfate were added, and the reaction was continued at 80°C, after the reaction was completed, filtration was carried out, and a binder with a solid content of 50wt% was obtained.

[0046] The binders prepared in Examples 1-5 and Comparative Examples 1-4 above were used to bond the same batch of foam models, and the bonding strength was tested after curing at room temperature for 24 hours, and the residue content of the binder was measured (ignited at 1000°C), and the results are shown in Table 1.

[0047] Table 1 Bonding strength and residue content of the binder

[0048]

[0049]

[0050] As shown in Table 1, the adhesive prepared by the present application has high bonding strength and less residue.

[0051] The foregoing is considered as the basic principles and main features of the present application and the advantages of the present application. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A foam plastic adhesive, characterized in that: The foam plastic adhesive is prepared from acrylate monomer, styrene, hydrophilic monomer, 1-allylhydantoin, emulsifier, initiator and deionized water; The solid content of the foam plastic binder is 45-55wt%; The mass ratio of the acrylate monomer, styrene, hydrophilic monomer, 1-allylhydantoin, emulsifier, and initiator is (20-30): (5-15): (1-10): (1-10): (0.5-5): (0.05-2); The acrylic acid ester monomer is at least one of methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, and butyl methacrylate; The hydrophilic monomer is at least one of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, acrylic acid, methacrylic acid, acrylamide, methacrylamide, and N-hydroxymethyl acrylamide.

2. The foam plastic adhesive according to claim 1, characterized in that: The emulsifier is at least one of alkyl sulfonate, sodium alkylbenzene sulfonate, alkylphenol polyoxyethylene ether, polyethylene glycol, and polyvinyl alcohol.

3. The foam plastic adhesive according to claim 1, characterized in that: The initiator is an inorganic peroxide initiator or an azo initiator.

4. The foam plastic adhesive according to claim 3, characterized in that: The inorganic peroxide initiator is at least one of potassium persulfate, ammonium persulfate, and sodium persulfate; The azo initiator is at least one of azobisisobutyronitrile and azobisisoheptanenitrile.

5. The method for preparing the foam plastic adhesive according to any one of claims 1 to 4, characterized in that: First, add 1 / 2 of the emulsifier and 1 / 2 of the initiator to deionized water, stir and dissolve, then add the acrylate monomer, styrene, hydrophilic monomer and 1-allylhydantoin, stir and react, then add the remaining 1 / 2 of the emulsifier and 1 / 2 of the initiator, continue stirring and reacting, filter after the reaction is completed to obtain the adhesive.

6. Use of the foam plastic binder according to any one of claims 1 to 4 or the foam plastic binder obtained by the preparation method according to claim 5 in lost foam casting of marine engineering dredging pumps.

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