Composite binder for casting and preparation method and application thereof

Abstract

The present invention relates to a composite binder for castings, a preparation method and an application thereof, wherein the raw materials for the preparation thereof include the following components: water glass, a silica sol solution and a refractory powder; the refractory powder includes abrasive powder. The present invention obtains a composite binder for castings with high temperature resistance, high strength and good bonding performance through reasonable design. Furthermore, the composite binder for castings has strong tensile bonding strength, shear bonding strength and high-temperature shear bonding strength, a high powder-liquid ratio, good fluidity and coverage, and a relatively smooth bonding surface between mold plates, which can improve the surface finish of the casting. In addition, the preparation method of the composite binder for castings of the present application is simple, and by adjusting the feeding step, a composite binder for castings with good performance can be obtained, which is suitable for bonding mold plates and has the potential for industrial production.

Description

Technical Field

[0001] The present application relates to the technical field of binders, and in particular to a casting composite binder and a preparation method and application thereof. Background Art

[0002] At present, the electrofusion casting process is an important material molding method, which involves melting the raw materials, casting them into a cavity that is adapted to the shape of the parts, solidifying and cooling them to form a product with the shape of the cavity. In the electrofusion casting process, the binder plays a vital role. It can bind the granular or powdered molding materials together to form a continuous bonding film with a certain strength, thereby forming a casting; in the electrofusion casting process, the binder can ensure the shape and dimensional accuracy of the casting, while improving the surface quality and internal quality of the casting.

[0003] In the foundry industry, mold binders can be divided into three categories according to their composition and properties: inorganic binders, organic binders, and composite binders. Among them, there are three main types of binders used to make mold shells, namely water glass binders, silica sol binders, and alcohol-based composite binders. In the electromelting material casting process, the selection of binders should be determined according to specific casting requirements and material properties. For example, for high-temperature casting and castings with high strength requirements, the binder is required to have the characteristics of high temperature resistance and high strength. At the same time, due to the poor bonding of the binder used in the casting, bubbles will be generated in the later stage, which may easily lead to the scrapping of bricks. The binder currently used in the casting has a long bonding and drying time, and will produce bubbles when burned in the later stage of use, which may easily lead to bricks that do not meet the requirements. Summary of the invention

[0004] Based on this, it is necessary to provide a casting composite binder, which has the characteristics of high temperature resistance, high strength and good bonding performance and is suitable for the foundry industry.

[0005] The technical solution of this application is as follows:

[0006] The first aspect of the present invention provides a casting composite binder, the raw materials for preparing the composite binder include the following components: water glass, silica sol solution and grinding powder.

[0007] In one embodiment, the weight ratio of water glass to silica sol solution is (20-50):1; and / or

[0008] The mass ratio of SiO2 in the silica sol aqueous solution is 35%-38%.

[0009] In one embodiment, the raw materials for preparing the casting composite binder also include a defoaming agent.

[0010] In one embodiment, the defoamer is one or more of a silicone defoamer, a polyether defoamer, a water-based coating water-based defoamer, a polyether-modified polysiloxane defoamer and a silicon (resin) defoamer.

[0011] In one embodiment, the casting composite binder comprises the following components by weight: 6-10 parts of water glass, 1.5-3 parts of silica sol solution, 10-20 parts of grinding powder and 0.2-0.8 parts of defoaming agent.

[0012] In one embodiment, the raw materials for preparing the casting composite binder include the following components in parts by weight: 8-10 parts of water glass, 2-2.5 parts of silica sol solution, 10-15 parts of grinding powder and 0.4-0.6 parts of defoaming agent.

[0013] A second aspect of the present invention provides a method for preparing the casting composite binder as described above, comprising the following steps:

[0014] The silica sol solution and refractory powder are first mixed, and then water glass is added to prepare a casting composite binder.

[0015] In one embodiment, the stirring time is 1 minute to 5 minutes.

[0016] In one embodiment, the standing time is more than 8 hours.

[0017] The third aspect of the present invention provides the use of the above-mentioned casting composite binder in the casting of AZS material of electrofusion material.

[0018] Compared with the prior art, this application has the following beneficial effects:

[0019] The present application obtains a composite mold binder with high temperature resistance, high strength and good bonding performance by rationally designing the formula of the composite mold binder. Furthermore, the composite mold binder has strong tensile bonding strength, shear bonding strength and high temperature shear bonding strength, high powder-liquid ratio, good fluidity and coverage, and a relatively smooth bonding surface of the mold plate, which can improve the smoothness of the casting surface, and the mold size is guaranteed to be free of deformation in the mold cavity.

[0020] In addition, the preparation method of the casting composite binder of the present application is simple. By adjusting the feeding steps, a casting composite binder with good performance can be obtained. The casting composite binder is suitable for bonding between two mold plates and has the potential for industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a rendering of the preparation of the casting composite binder for use in one embodiment.

[0023] Figure 2 This is a diagram showing the effect of using a casting composite adhesive to bond a mold plate in an embodiment.

[0024] Figure 3 Schematic diagram of the effect of using a casting composite binder for molding in one embodiment. DETAILED DESCRIPTION

[0025] The following is a further detailed description of the mold composite binder and its preparation method and application of the present application in conjunction with specific embodiments. The present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly understood.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0027] Unless otherwise specified or incompatible herewith, the terms and phrases used herein shall have the following meanings:

[0028] As used herein, "one or more" refers to any one, any two, or any two or more of the listed items.

[0029] Herein, the optional scope of "and / or", "or / and", and "and / or" includes any one of two or more relevant listed items, and also includes any and all combinations of the relevant listed items, wherein said any and all combinations include any two relevant listed items, any more relevant listed items, or a combination of all relevant listed items. (It should be noted that when at least three items are connected by at least two conjunctions selected from "and / or", "or / and", and "and / or", it should be understood that in the present application, the technical solution undoubtedly includes technical solutions that are all connected by "logical AND", and also undoubtedly includes technical solutions that are all connected by "logical OR". For example, "A and / or B" includes three parallel solutions of A, B and A+B. For another example, the technical solution of "A, and / or, B, and / or, C, and / or, D" includes any one of A, B, C, and D (that is, technical solutions that are all connected by "logical OR"), and also includes any and all combinations of A, B, C, and D, that is, a combination of any two or any three of A, B, C, and D, and also includes a combination of four items of A, B, C, and D (that is, a technical solution that is all connected by "logical AND").)

[0030] Herein, "further", "further", "particularly" and the like are used for descriptive purposes to indicate differences in content, but should not be construed as limiting the scope of protection of this application.

[0031] Herein, "first aspect", "second aspect", "third aspect", "fourth aspect", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly indicating the importance or quantity of the indicated technical features. In addition, "first", "second", "third", "fourth", etc. only serve the purpose of non-exhaustive enumeration and description, and it should be understood that they do not constitute a closed limitation on quantity. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the description of the present application, the meaning of "several" is at least one, such as one, two, etc., unless otherwise clearly and specifically defined.

[0032] In this application, when it comes to numerical ranges, unless otherwise specified, the above numerical ranges are deemed to be continuous and include the minimum and maximum values ​​of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges included therein.

[0033] Only some numerical ranges are specifically disclosed herein. However, any lower limit can be combined with any upper limit to form an undefined range; and any lower limit can be combined with other lower limits to form an undefined range, and any upper limit can be combined with any other upper limit to form an undefined range. In addition, each separately disclosed point or single value itself can be combined with any other point or single value as a lower limit or upper limit or with other lower limits or upper limits to form an undefined range. The use of numerical ranges represented by endpoints includes all numbers within the range and any range within the range, for example, 1 to 5 includes 1, 1.1, 1.3, 1.5, 2, 2.75, 3, 3.80, 4 and 5, etc.

[0034] The percentage contents involved in this application, unless otherwise specified, refer to mass percentage for solid-liquid mixing and solid-solid mixing, and refer to volume percentage for liquid-liquid mixing.

[0035] The percentage concentrations mentioned in this application, unless otherwise specified, refer to the final concentration, which refers to the percentage of the added component in the system after the addition of the component.

[0036] The temperature parameters in this application, unless otherwise specified, allow both constant temperature treatment and treatment within a certain temperature range. The constant temperature treatment allows the temperature to fluctuate within the accuracy range controlled by the instrument. Fluctuations within the range of ±5°C, ±2°C, ±1°C, ±0.5°C, ±0.4°C, ±0.3°C, ±0.2°C, and ±0.1°C are allowed. Normal temperature or room temperature in this application refers to no temperature control operation, generally 4°C~35°C, preferably 20±5°C.

[0037] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0040] The first aspect of the present invention provides a casting composite binder, the raw materials for preparing the same include the following components: water glass, silica sol solution and grinding powder. Specifically, the grinding powder is ground into powdery material by a ball mill using AZS mixed material, and the particle size is controlled to be 220-320 meshes.

[0041] In some examples, the weight ratio of the water glass to the silica sol solution is (20-50): 1. It can be understood that the weight ratio of the water glass to the silica sol solution includes but is not limited to 20:1, 25:1, 30:1, 35:1, 40:1, 45:1, 50:1.

[0042] In some examples, the mass ratio of SiO2 in the silica sol aqueous solution is 35%-38%. It can be understood that the mass ratio of SiO2 in the silica sol aqueous solution includes but is not limited to 35%, 35.5%, 36%, 36.5%, 37%, 37.5%, and 38%.

[0043] In some of the examples, the raw materials for preparing the casting composite binder also include a defoaming agent.

[0044] In some examples, the defoamer is one or more of an organosilicon defoamer, a polyether defoamer, a water-based coating water-based defoamer, a polyether-modified polysiloxane defoamer, and a silicon (resin) defoamer. Further, the defoamer is a water-based coating water-based defoamer.

[0045] In some of the examples, the casting composite binder includes the following components in parts by weight: 6-10 parts of water glass, 1.5-3 parts of silica sol solution, 10-20 parts of grinding powder and 0.2-0.8 parts of defoaming agent.

[0046] In some of the examples, the raw materials for preparing the casting composite binder include the following components in parts by weight: 8-10 parts of water glass, 2-2.5 parts of silica sol solution, 10-15 parts of grinding powder and 0.4-0.6 parts of defoaming agent.

[0047] A second aspect of the present invention provides a method for preparing the casting composite binder as described above, comprising the following steps:

[0048] The silica sol solution and refractory powder are first mixed, and then water glass is added to prepare a casting composite binder.

[0049] In some examples, the method for preparing the casting composite binder includes the following steps:

[0050] Firstly, the silica sol solution and refractory powder are uniformly mixed, and then water glass is added to prepare a mixed solution;

[0051] The defoamer is added into the mixed solution, stirred, sealed and allowed to stand to prepare a casting composite binder.

[0052] In some of these examples, the stirring time is 1 minute to 5 minutes. It is understandable that the stirring time includes but is not limited to 1 minute, 1.5 minutes, 2 minutes, 2.5 minutes, 3 minutes, 3.5 minutes, 4 minutes, 4.5 minutes, and 5 minutes.

[0053] In some examples, the standing time was more than 8 hours.

[0054] The third aspect of the present invention provides the use of the above-mentioned casting composite binder in the casting of AZS material of electrofusion material.

[0055] The following is further described in conjunction with specific embodiments. The raw materials involved in the following specific embodiments, unless otherwise specified, can all be commercially available; the instruments used, unless otherwise specified, can all be commercially available; the processes involved, unless otherwise specified, are all routinely selected by those skilled in the art.

[0056] The present application is further described in detail below in conjunction with specific examples. For experimental parameters not specified in the following specific examples, reference is made to the instructions given in the present application document, and reference may also be made to the experimental manual of the art or other experimental methods known in the art, or to the experimental conditions recommended by the manufacturer. It is understood that the instruments and raw materials used in the following examples are relatively specific, and may not be limited thereto in other specific examples.

[0057] Some of the raw materials used in the embodiment are as follows:

[0058] Water glass can be purchased from: Foshan Zhongfa Water Glass Factory;

[0059] Silica sol can be purchased from: Foshan Zhongfa Water Glass Factory. The mass ratio of SiO2 in the silica sol aqueous solution is 35~38%;

[0060] Grinding powder can be purchased from: Guangdong Shijing New Materials Company;

[0061] The defoaming agent is Dongguan Xinbocheng SP818.

[0062] The following are specific embodiments.

[0063] Example 1

[0064] At room temperature of 25°C to 35°C, perform the following steps:

[0065] In the first step, select the following raw materials: 0.98 kg of water glass, 0.2 kg of silica sol aqueous solution, 1.35 kg of grinding powder (refractory powder), and 0.06 kg of defoaming agent.

[0066] The second step is to put the silica sol solution and refractory powder into a stirring barrel and stir them quickly, then add water glass and stir evenly to obtain a mixed solution.

[0067] The third step is to add the defoamer into the mixture and stir evenly for about 3 minutes.

[0068] The fourth step is to put the mixed solution containing the defoaming agent into a bottle, seal it and leave it to stand for more than 8 hours to obtain a mixed binder of water glass and silica sol.

[0069] Example 2

[0070] At room temperature of 25°C to 35°C, perform the following steps:

[0071] In the first step, select the following raw materials: 0.95 kg of water glass, 0.2 kg of silica sol aqueous solution, 1.25 kg of grinding powder (refractory powder), and 0.06 kg of defoaming agent.

[0072] The second step is to put the silica sol solution and refractory powder into a stirring barrel and stir them quickly, then add water glass and stir evenly to obtain a mixed solution.

[0073] The third step is to add the defoamer into the mixture and stir evenly for about 3 minutes.

[0074] The fourth step is to put the mixed solution containing the defoaming agent into a bottle, seal it and leave it to stand for more than 8 hours to obtain a mixed binder of water glass and silica sol.

[0075] Example 3

[0076] At room temperature of 25°C to 35°C, perform the following steps:

[0077] In the first step, select the following raw materials: 0.92 kg of water glass, 0.2 kg of silica sol aqueous solution, 1.45 kg of grinding powder (refractory powder), and 0.04 kg of defoaming agent.

[0078] The second step is to put the silica sol solution and refractory powder into a stirring barrel and stir them quickly, then add water glass and stir evenly to obtain a mixed solution.

[0079] The third step is to add the defoamer into the mixture and stir evenly for about 3 minutes.

[0080] The fourth step is to put the mixed solution containing the defoaming agent into a bottle, seal it and leave it to stand for more than 8 hours to obtain a mixed binder of water glass and silica sol.

[0081] Example 4

[0082] At room temperature of 25°C to 35°C, perform the following steps:

[0083] In the first step, select the following raw materials: 0.85 kg of water glass, 0.25 kg of silica sol aqueous solution, 1.15 kg of grinding powder (refractory powder), and 0.05 kg of defoaming agent.

[0084] The second step is to put the silica sol solution and refractory powder into a stirring barrel and stir them quickly, then add water glass and stir evenly to obtain a mixed solution.

[0085] The third step is to add the defoamer into the mixture and stir evenly for about 3 minutes.

[0086] The fourth step is to put the mixed solution containing the defoaming agent into a bottle, seal it and leave it to stand for more than 8 hours to obtain a mixed binder of water glass and silica sol.

[0087] Example 5

[0088] At room temperature of 25°C to 35°C, perform the following steps:

[0089] In the first step, select the following raw materials: 0.88 kg of water glass, 0.25 kg of silica sol aqueous solution, 1.05 kg of grinding powder (refractory powder), and 0.06 kg of defoaming agent.

[0090] The second step is to put the silica sol solution and refractory powder into a stirring barrel and stir them quickly, then add water glass and stir evenly to obtain a mixed solution.

[0091] The third step is to add the defoamer into the mixture and stir evenly for about 3 minutes.

[0092] The fourth step is to put the mixed solution containing the defoaming agent into a bottle, seal it and leave it to stand for more than 8 hours to obtain a mixed binder of water glass and silica sol.

[0093] Example 6

[0094] At room temperature of 25°C to 35°C, perform the following steps:

[0095] In the first step, select the following raw materials: 0.95 kg of water glass, 0.2 kg of silica sol aqueous solution, 1.15 kg of grinding powder (refractory powder), and 0.05 kg of defoaming agent.

[0096] The second step is to put the silica sol solution and refractory powder into a stirring barrel and stir them quickly, then add water glass and stir evenly to obtain a mixed solution.

[0097] The third step is to add the defoamer into the mixture and stir evenly for about 3 minutes.

[0098] The fourth step is to put the mixed solution containing the defoaming agent into a bottle, seal it and leave it to stand for more than 8 hours to obtain a mixed binder of water glass and silica sol.

[0099] Comparative Example 1

[0100] At room temperature of 25°C to 35°C, perform the following steps:

[0101] In the first step, the following raw materials are selected: 0.98 kg of water glass, 0.2 kg of silica sol aqueous solution, 1.35 kg of quartz powder, and 0.06 kg of defoaming agent.

[0102] The second step is to put the silica sol solution and refractory powder into a stirring barrel and stir them quickly, then add water glass and stir evenly to obtain a mixed solution.

[0103] The third step is to add the defoamer into the mixture and stir evenly for about 3 minutes.

[0104] The fourth step is to put the mixed solution containing the defoaming agent into a bottle, seal it and leave it to stand for more than 8 hours to obtain a mixed binder of water glass and silica sol.

[0105] Comparative Example 2

[0106] At room temperature of 25°C to 35°C, perform the following steps:

[0107] In the first step, the following raw materials are selected: 0.88 kg of water glass, 0.15 kg of silica sol aqueous solution, 1.35 kg of grinding powder, and no defoaming agent is used.

[0108] The second step is to put the silica sol solution and refractory powder into a stirring barrel and stir them quickly, then add water glass and stir evenly to obtain a mixed solution.

[0109] The third step is to add the defoamer into the mixture and stir evenly for about 3 minutes.

[0110] The fourth step is to put the mixed solution containing the defoaming agent into a bottle, seal it and leave it to stand for more than 8 hours to obtain a mixed binder of water glass and silica sol.

[0111] Comparative Example 3

[0112] At room temperature of 25°C to 35°C, perform the following steps:

[0113] The first step is to select the following raw materials: 0.98 kg of water glass, 0.2 kg of silica sol aqueous solution, 1.35 kg of grinding powder, and 0.06 kg of defoaming agent. The second step is to put the silica sol solution and refractory powder into a stirring barrel and stir quickly, then add the water glass and stir evenly to obtain a mixed solution.

[0114] The third step is to add the defoamer into the mixture and stir evenly for about 3 minutes.

[0115] The fourth step is to put the mixed solution containing the defoaming agent into a bottle, seal it and leave it to stand for more than 8 hours to obtain a mixed binder of water glass and silica sol.

[0116] Comparative Example 4

[0117] At room temperature of 25°C to 35°C, perform the following steps:

[0118] In the first step, the following raw materials are selected: 0.98 kg of water glass, 0.2 kg of silica sol aqueous solution, 1.4 kg of quartz powder, and 0.06 kg of defoaming agent.

[0119] The second step is to put the silica sol solution and refractory powder into a stirring barrel and stir them quickly, then add water glass and stir evenly to obtain a mixed solution.

[0120] The third step is to add the defoamer into the mixture and stir evenly for about 3 minutes.

[0121] The fourth step is to put the mixed solution containing the defoaming agent into a bottle, seal it and leave it to stand for more than 8 hours to obtain a mixed binder of water glass and silica sol.

[0122] Comparative Example 5

[0123] At room temperature of 32°C, perform the following steps:

[0124] In the first step, the following raw materials are selected: 0.98 kg of water glass, 0.2 kg of silica sol aqueous solution, 1.45 kg of quartz powder, and 0.06 kg of defoaming agent.

[0125] The second step is to put the silica sol solution and refractory powder into a stirring barrel and stir them quickly, then add water glass and stir evenly to obtain a mixed solution.

[0126] The third step is to add the defoamer into the mixture and stir evenly for about 3 minutes.

[0127] The fourth step is to put the mixed solution containing the defoaming agent into a bottle, seal it and leave it to stand for more than 8 hours to obtain a mixed binder of water glass and silica sol.

[0128] Comparative Example 6

[0129] At room temperature of 25°C to 35°C, perform the following steps:

[0130] In the first step, the following raw materials are selected: 0.85 kg of water glass, 0.25 kg of silica sol aqueous solution, 0.05 kg of grinding powder, and no defoaming agent is used.

[0131] The second step is to put the silica sol solution and refractory powder into a stirring barrel and stir them quickly, then add water glass and stir evenly to obtain a mixed solution.

[0132] The third step is to add the defoamer into the mixture and stir evenly for about 3 minutes.

[0133] Step 4: Put the mixed solution with defoamer into a bottle and seal it for more than 8 hours to obtain a mixed binder of water glass and silica sol.

[0134] The casting composite binders prepared in Examples 1 to 6 and Comparative Examples 1 to 6 were subjected to performance tests, and the test results are shown in Table 2 below.

[0135] The bonding performance test method is to stir the composite adhesive evenly and prepare it for use. Figure 1-3 , as shown in Table 1 and Table 2. Figure 3 It can be seen that the use of composite adhesive for casting molds has strong bonding strength, and the size of the casting mold is guaranteed without deformation in the mold cavity. As can be seen from Table 1, through the comparison of test data, the test data of Example 1 is relatively good; the order of adding materials will also affect the performance; adding refractory powder is better than adding quartz powder; not adding defoaming agent has a greater impact on bonding strength. At the same time, as shown in Table 2, the finish grade of the mold plate using the adhesive of this application is higher.

[0136] Table 1 Performance test results of embodiments and comparative examples

[0137]

[0138] Table 2

[0139]

[0140] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0141] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims, and the description may be used to interpret the content of the claims.

Claims

1. A casting composite binder, characterized in that: The preparation raw materials include the following components: water glass, silica sol aqueous solution and grinding powder.

2. The casting composite binder according to claim 1, characterized in that: The weight ratio of the water glass to the silica sol solution is (20-50):1; and / or The mass ratio of SiO2 in the silica sol aqueous solution is 35%-38%.

3. The casting composite binder according to claim 1, characterized in that: The preparation raw materials also include defoaming agent.

4. The casting composite binder according to claim 3, characterized in that: The defoamer is one or more of an organosilicon defoamer, a polyether defoamer, a water-based coating water-based defoamer, a polyether-modified polysiloxane defoamer and a silicon (resin) defoamer.

5. The casting composite binder according to claim 3 or 4, characterized in that: The raw materials for preparing the invention include the following components in parts by weight: 6-10 parts of water glass, 1.5-3 parts of silica sol solution, 10-20 parts of grinding powder and 0.2-0.8 parts of defoaming agent.

6. The casting composite binder according to claim 3 or 4, characterized in that: The raw materials for preparing the invention include the following components by weight: 8-10 parts of water glass, 2-2.5 parts of silica sol solution, 10-15 parts of grinding powder and 0.4-0.6 parts of defoaming agent.

7. A method for preparing a composite binder for casting according to any one of claims 1 to 6, characterized in that: The steps include: The silica sol solution and refractory powder are first mixed, and then water glass is added to prepare a casting composite binder.

8. The method for preparing a composite binder for casting according to claim 7, characterized in that: The stirring time is 1 minute to 5 minutes.

9. The method for preparing a composite binder for casting according to claim 7, characterized in that: The standing time is more than 8 hours.

10. Use of the casting composite binder according to any one of claims 1 to 6 in casting of AZS materials using electrofusion materials.

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