Thick hard plate-shaped insulating material and preparation method thereof

Abstract

The invention provides a thick hard plate-shaped insulating material and a preparation method thereof. Comprising the following components in parts by weight: 80 to 90 parts by weight of resin, 1.0 to 1.2 parts by weight of a high-temperature curing agent, 2.5 to 3.5 parts by weight of a low shrinkage agent, 7 to 9 parts by weight of polyethylene micro powder, 1.6 to 2.4 parts by weight of color paste, 0.8 to 1.2 parts by weight of a release agent, 2.6 to 3.5 parts by weight of a diluent, 3 to 5 parts by weight of a thickening agent and 105 to 135 parts by weight of H-WF-08 filler. According to the improved scheme, only fabric pressing is selected, the formula composition of the fabric is optimized, the pressing temperature, pressure and time are controlled in the hot pressing process, and the heating surface is synchronously changed, so that internal volatile substances are discharged in time, the interior and corners are thoroughly cured, the time for preparing a UPGM203 mold pressing plate of 80 mm is only 90 minutes, and the production efficiency is greatly improved. The production process is generally simplified, the operation efficiency of workers is improved, the prepared product is good in surface smoothness, complete in curing, free of cracks, high in curvature and arc resistance, the thickness meets the requirement, batch production can be achieved, and application and popularization are facilitated.

Description

Technical Field

[0001] The present application belongs to the technical field of insulating materials, and in particular relates to a thick rigid plate-shaped insulating material and a preparation method thereof. Background Art

[0002] UPGM 203 is a hard plate-shaped insulating material made by hot pressing an alkali-free glass fiber felt board impregnated with unsaturated polyester resin paste and adding corresponding additives. The thickness of the existing UPGM 203 board is basically 3 to 30 mm, which cannot meet the market demand for thick hard plate-shaped insulating materials. The production method of laminating semi-cured sheets with multiple curing systems, that is, laminating semi-cured sheets obtained by two formulas of surface fabric and intermediate core material, not only has a long production cycle, low production efficiency, and the risk of cracking, but also has a cumbersome production process, low efficiency, and the mechanical properties cannot meet the application requirements. Summary of the invention

[0003] The present application is made in view of the above-mentioned problems, and its purpose is to provide a thick rigid plate-shaped insulating material and a preparation method thereof.

[0004] The first aspect of the present application provides a thick rigid plate-like insulating material, comprising a resin paste impregnated with alkali-free glass fiber felt, wherein the resin paste is composed of the following parts by weight: 80-90 parts by weight of resin, 1.0-1.2 parts by weight of high-temperature curing agent, 2.5-3.5 parts by weight of low shrinkage agent, 7-9 parts by weight of polyethylene micropowder, 1.6-2.4 parts by weight of color paste, 0.8-1.2 parts by weight of release agent, 2.6-3.5 parts by weight of styrene (diluent), 3-5 parts by weight of thickener, and 105-135 parts by weight of H-WF-08 filler.

[0005] In any embodiment, the resin paste comprises the following components in parts by weight: 85 parts by weight of resin, 1.1 parts by weight of high temperature curing agent, 3 parts by weight of low shrinkage agent, 8 parts by weight of polyethylene micropowder, 2 parts by weight of color paste, 1 part by weight of release agent, 3 parts by weight of styrene (diluent), 4 parts by weight of thickener, and 120 parts by weight of H-WF-08 filler.

[0006] In any embodiment, the thickener is 25% magnesium oxide paste, and the filler is H-WF-08 and H-WF-25.

[0007] In any embodiment, the addition ratio of H-WF-08 and H-WF-25 is 2:1.

[0008] A method for preparing a thick rigid plate-shaped insulating material comprises the following steps: a film is formed by impregnating an alkali-free glass fiber felt in a resin paste of the insulating material, and is formed by pulling through a film-containing sheet machine; after thickening to reach a mature viscosity that meets the process requirements, a UPGM 203 molded plate is obtained by hot pressing, and the hot pressing process is as follows: a preheating temperature of 95-110°C, a pressing pressure of 200-220 bar, a pressing time of 25-35 min, and the upper and lower molds are heated and pressed on both sides; a first curing temperature of 145-155°C, a pressing pressure of 200-220 bar, and a pressing time of 45-55 min, and the upper mold is heated and pressed on one side; a second curing temperature of 95-110°C, a pressing pressure of 200-220 bar, and a pressing time of 8-12 min, and the upper and lower molds are heated and pressed on both sides; and cooling to obtain the molded plate.

[0009] In any embodiment, the hot pressing process is: preheating temperature is 100°C, pressing pressure is 210 bar, pressing time is 30 minutes, and both sides of the upper and lower molds are heated and pressed; the first curing temperature is 150°C, pressing pressure is 210 bar, pressing time is 50 minutes, and one side of the upper mold is heated and pressed; the second curing temperature is 100°C, pressing pressure is 210 bar, pressing time is 10 minutes, and both sides of the upper and lower molds are heated and pressed; cooling obtains a molded plate.

[0010] In any embodiment, the impregnation amount of the film is 450g / m 2 The thickening process is to place the fabric in a thickening room at 50-60°C for 48 hours.

[0011] In any embodiment, the size of the molded plate is 80±2mm*1230*2100mm, and the total weight is 372kg.

[0012] The beneficial effects of the present invention are as follows: the present application only selects the fabric for pressing through the improved scheme, optimizes the formula composition of the fabric, controls the pressing temperature, pressure and time during the hot pressing process, synchronously changes the heating surface, thereby timely discharging the internal volatile substances, and thoroughly solidifying the interior and corners. It only takes 90 minutes to prepare an 80mm UPGM203 molded plate, which simplifies the production process as a whole and improves the operating efficiency of employees. The prepared product has good surface smoothness, complete solidification, no cracks, meets the thickness requirements, has high curvature and strong arc resistance, and can achieve mass production, which is conducive to promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a physical picture of a thick rigid plate-shaped insulating material and a preparation method thereof according to the present application.

[0014] Figure 2This is a thickness measurement diagram of a thick rigid plate-shaped insulating material and a preparation method thereof of the present application.

[0015] Figure 3 This is an arc resistance test diagram of a thick rigid plate-shaped insulating material and a preparation method product of the present application.

[0016] Figure 4 This is a bending strength test diagram of a thick rigid plate-shaped insulating material and a preparation method thereof of the present application. DETAILED DESCRIPTION

[0017] Hereinafter, a thick rigid plate-shaped insulating material and an embodiment of a method for preparing the same are specifically disclosed with appropriate reference to the accompanying drawings. However, there may be cases where unnecessary detailed descriptions are omitted. For example, there may be cases where detailed descriptions of well-known matters and repeated descriptions of actually the same structures are omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. In addition, the drawings and the following descriptions are provided for those skilled in the art to fully understand the present application and are not intended to limit the subject matter described in the claims.

[0018] "Scope" disclosed in the present application is limited in the form of lower limit and upper limit, and a given range is limited by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of a special range. The scope limited in this way can be including end values ​​or not including end values, and can be arbitrarily combined, that is, any lower limit can be combined with any upper limit to form a scope. For example, if the scope of 60-120 and 80-110 is listed for a specific parameter, it is understood that the scope of 60-110 and 80-120 is also expected. In addition, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3, 4 and 5 are listed, the following scope can be all expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In the present application, unless otherwise specified, the numerical range "ab" represents the abbreviation of any real number combination between a and b, wherein a and b are real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" are listed in this document, and "0-5" is just an abbreviation of these numerical combinations. In addition, when a parameter is expressed as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0019] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0020] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0021] If there is no special explanation, all steps of the present application can be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, the method may further include step (c), which means that step (c) may be added to the method in any order. For example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0022] If there is no special explanation, the "include" and "comprising" mentioned in this application are open-ended or closed-ended. For example, the "include" and "comprising" may mean that other components not listed may also be included or only the listed components may be included or only the listed components may be included.

[0023] If not specifically stated, in this application, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, any of the following conditions satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0024] A thick rigid plate-shaped insulating material comprises a resin paste impregnated with an alkali-free glass fiber felt, wherein the resin paste comprises the following parts by weight: 80-90 parts by weight of resin, 1.0-1.2 parts by weight of a high-temperature curing agent, 2.5-3.5 parts by weight of a low shrinkage agent, 7-9 parts by weight of polyethylene micropowder, 1.6-2.4 parts by weight of a color paste, 0.8-1.2 parts by weight of a release agent, 2.6-3.5 parts by weight of styrene (diluent), 3-5 parts by weight of a thickener, and 105-135 parts by weight of an H-WF-08 filler.

[0025] The resin may be an unsaturated polyester resin, the high temperature curing agent may be tert-butyl peroxide, the low shrinkage agent may be polystyrene, the color paste may be a monoazo type, the release agent may be a polyol phosphate, and the thickener may be magnesium oxide.

[0026] In some embodiments, the resin paste comprises the following components in parts by weight: 85 parts by weight of resin, 1.1 parts by weight of high temperature curing agent, 3 parts by weight of low shrinkage agent, 8 parts by weight of polyethylene micropowder, 2 parts by weight of color paste, 1 part by weight of release agent, 3 parts by weight of styrene, 4 parts by weight of thickener, and 120 parts by weight of H-WF-08 filler.

[0027] In some embodiments, the thickener is 25% magnesium oxide paste, and the filler is H-WF-08 and H-WF-25.

[0028] In some embodiments, the addition ratio of H-WF-08 and H-WF-25 is 2:1.

[0029] A method for preparing a thick rigid plate-shaped insulating material comprises the following steps: a film is formed by impregnating an alkali-free glass fiber felt in a resin paste of the insulating material, and is formed by pulling through a film-containing sheet machine; after thickening to reach a mature viscosity that meets the process requirements, a UPGM 203 molded plate is obtained by hot pressing, and the hot pressing process is as follows: a preheating temperature of 95-110°C, a pressing pressure of 200-220 bar, a pressing time of 25-35 min, and the upper and lower molds are heated and pressed on both sides; a first curing temperature of 145-155°C, a pressing pressure of 200-220 bar, a pressing time of 45-55 min, and the upper mold is heated and pressed on one side; a second curing temperature of 95-110°C, a pressing pressure of 200-220 bar, a pressing time of 8-12 min, and the upper and lower molds are heated and pressed on both sides; and the molded plate is obtained by natural cooling.

[0030] In some embodiments, the hot pressing process is: preheating temperature is 100°C, pressing pressure is 210 bar, pressing time is 30 minutes, and both sides of the upper and lower molds are heated and pressed; the first curing temperature is 150°C, pressing pressure is 210 bar, pressing time is 50 minutes, and one side of the upper mold is heated and pressed; the second curing temperature is 100°C, pressing pressure is 210 bar, pressing time is 10 minutes, and both sides of the upper and lower molds are heated and pressed; cooling obtains a molded plate.

[0031] In some embodiments, the impregnation amount of the film is 450g / m 2 The thickening process is to place the fabric in a thickening room at 50-60°C for 48 hours.

[0032] In some embodiments, the size of the molded plate is 80 ±

[0033] 2mm*1230*2100mm, total weight is 372kg. By controlling the weight, the thickness of the product can be controlled and the tolerance can be guaranteed.

[0034] Example

[0035] Hereinafter, the embodiments of the present application will be described. The embodiments described below are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. If no specific techniques or conditions are indicated in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. If the manufacturer is not indicated in the reagents or instruments used, they are all conventional products that can be obtained commercially.

[0036] Example 1

[0037] A method for preparing a thick rigid plate-shaped insulating material comprises the following steps:

[0038] First, a resin paste is prepared according to the following weight parts: 85 weight parts of resin, 1.1 weight parts of high temperature curing agent, 3 weight parts of low shrinkage agent, 8 weight parts of polyethylene powder, 2 weight parts of color paste, 1 weight part of release agent, 3 weight parts of styrene (diluent), 4 weight parts of thickener, 80 weight parts of H-WF-08 filler, and 40 weight parts of H-WF-02 filler;

[0039] Then, the film is formed by alkali-free glass fiber felt impregnated in the resin paste of the above insulating material, and is pulled through a film-containing machine, and the fabric is placed in a thickening room at 50-60°C for 48 hours;

[0040] Finally, the UPGM 203 molded plate was obtained through a hot pressing process, and the hot pressing process was as follows: preheating temperature was 100°C, pressing pressure was 210 bar, pressing time was 30 min, and both sides of the upper and lower molds were heated and pressed; the first curing temperature was 150°C, pressing pressure was 210 bar, pressing time was 50 min, and one side of the upper mold was heated and pressed; the second curing temperature was 100°C, pressing pressure was 210 bar, pressing time was 10 min, and both sides of the upper and lower molds were heated and pressed; cooling was performed to obtain the molded plate.

[0041] Comparative Example 1

[0042] The resin paste prepared in Example 1 was used to impregnate the surface board; the core board was obtained by impregnating the resin paste prepared by the following formula: 90 parts by weight of resin, 0.3 parts by weight of medium-temperature curing agent, 0.8 parts by weight of high-temperature curing agent, 3 parts by weight of low shrinkage agent, 8 parts by weight of polyethylene micropowder, 2 parts by weight of color paste, 3 parts by weight of styrene (diluent), 4 parts by weight of thickener, 80 parts by weight of H-WF-08 filler, and 40 parts by weight of H-WF-02 filler; then 34 core boards and 72 The core plate is hot pressed with 36 fabric plates on each side; the hot pressing process is as follows: preheating temperature is 100°C, pressing pressure is 210 bar, pressing time is 60 min, and both sides of the upper and lower molds are heated and pressed; the first curing temperature is 110°C, pressing pressure is 210 bar, pressing time is 90 min, and both sides of the upper and lower molds are heated and pressed; the second curing temperature is 120°C, pressing pressure is 210 bar, pressing time is 30 min, and both sides of the upper and lower molds are heated and pressed; cooling is performed to obtain a molded plate.

[0043] Comparative Example 2

[0044] The difference from Comparative Example 1 is that the hot pressing process is different. The hot pressing process is: preheating temperature is 100°C, pressing pressure is 210 bar, pressing time is 60 min, and both sides of the upper and lower molds are heated and pressed; the first curing temperature is 110°C, pressing pressure is 210 bar, pressing time is 90 min, and one side of the upper mold is heated and pressed; the second curing temperature is 120°C, pressing pressure is 210 bar, pressing time is 30 min, and one side of the upper mold is heated and pressed. The other steps are the same as other operations are the same as Comparative Example 1.

[0045] Comparative Example 3

[0046] The difference from Example 1 is that the hot pressing process is different. The hot pressing process is: preheating temperature is 100°C, pressing pressure is 210 bar, pressing time is 60 min, and both sides of the upper and lower molds are heated and pressed; the first curing temperature is 120°C, pressing pressure is 210 bar, pressing time is 90 min, and one side of the upper mold is heated and pressed; the second curing temperature is 150°C, pressing pressure is 210 bar, pressing time is 30 min, and one side of the upper mold is heated and pressed. The other steps are the same as other operations are the same as Example 1.

[0047] Comparative Example 4

[0048] The difference from Example 1 is that the hot pressing process is different. The hot pressing process is: preheating temperature is 100°C, pressing pressure is 210 bar, pressing time is 30 minutes, and both sides of the upper and lower molds are heated and pressed; the first curing temperature is 120°C, pressing pressure is 210 bar, pressing time is 50 minutes, and one side of the upper mold is heated and pressed; the second curing temperature is 150°C, pressing pressure is 210 bar, pressing time is 30 minutes, and one side of the upper mold is heated and pressed. The other steps are the same as other operations are the same as Example 1.

[0049] Comparative Example 5

[0050] The difference from Example 1 is that the hot pressing process is different. The hot pressing process is: preheating temperature is 100°C, pressing pressure is 210 bar, pressing time is 30 minutes, and both sides of the upper and lower molds are heated and pressed; the first curing temperature is 150°C, pressing pressure is 210 bar, pressing time is 30 minutes, and one side of the upper mold is heated and pressed; the second curing temperature is 150°C, pressing pressure is 210 bar, pressing time is 30 minutes, and both sides of the upper and lower molds are heated and pressed. The other steps are the same as other operations are the same as Example 1.

[0051] The molded plates obtained in the above embodiments and comparative examples were tested, and the test results are shown in Table 1:

[0052] Table 1

[0053]

[0054] In comparative example 1, the core material of the medium-temperature curing agent is sandwiched in the middle, and the fabric of the high-temperature curing agent is placed on the surface. When the core material is cured, the fabric is in a softened and flowing state, and volatiles are discharged when the core material is cured. When the temperature of the mold rises to the point where the fabric is cured, because the surface layer is exposed to the high temperature first, the fabric layer is cured from the surface to the inside, and the volatiles of the fabric layer cannot be completely discharged, and cracking still occurs.

[0055] Although the surface of Comparative Example 2 is completely cured, there are cracks inside the board; when the oil temperature rises, the core material of the medium-temperature curing agent is cured, and then the surface fabric is also cured, the volatiles cannot be completely discharged, and cracks still exist.

[0056] Comparative Examples 3 and 4 used single-sided heating and curing, and there was no cracking. However, due to the loss of heat transfer, the temperature was raised to 150°C and pressed for 30 minutes, and the corners of the lower mold surface were not completely cured, and the arc resistance performance was the worst. In Comparative Example 5, the single-sided heating and curing time was only 30 minutes, and the lower mold inlet oil valve was opened in a short time, resulting in incomplete discharge of volatiles and cracking inside. After the upper mold surface of Example 1 was single-sidedly heated and cured at 150°C for 50 minutes, the lower mold oil inlet valve was opened for 10 minutes to heat the lower surface so that the corners were cured more thoroughly, avoiding the situation of uncured corners in Comparative Example 4. At the same time, there was no cracking in the plate, and the performance test was also the best. In summary, the 80mm surface of the molded plate prepared by the present application scheme is bright and crack-free.

[0057] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A thick rigid plate-shaped insulating material, characterized in that: The invention comprises a resin paste impregnated with alkali-free glass fiber felt, wherein the resin paste is composed of the following parts by weight: 80-90 parts by weight of resin, 1.0-1.2 parts by weight of high temperature curing agent, 2.5-3.5 parts by weight of low shrinkage agent, 7-9 parts by weight of polyethylene micropowder, 1.6-2.4 parts by weight of color paste, 0.8-1.2 parts by weight of release agent, 2.6-3.5 parts by weight of diluent, 3-5 parts by weight of thickener and 105-135 parts by weight of H-WF-08 filler.

2. A thick rigid plate-shaped insulating material according to claim 1, characterized in that: The thickener is 25% magnesium oxide paste, and the fillers are H-WF-08 and H-WF-25.

3. A thick rigid plate-shaped insulating material according to claim 1, characterized in that: The resin paste comprises the following components in parts by weight: 85 parts by weight of resin, 1.1 parts by weight of high-temperature curing agent, 3 parts by weight of low shrinkage agent, 8 parts by weight of polyethylene micropowder, 2 parts by weight of color paste, 1 part by weight of release agent, 3 parts by weight of styrene, 4 parts by weight of thickener, and 120 parts by weight of H-WF-08 filler.

4. A thick rigid plate-shaped insulating material according to claim 2 or 3, characterized in that: The addition ratio of H-WF-08 and H-WF-25 is 2:

1.

5. A method for preparing a thick rigid plate-shaped insulating material, comprising the following steps: a film is formed by impregnating an alkali-free glass fiber felt in a resin paste of the above insulating material, and is formed by pulling through a film-containing sheet machine, and after thickening to reach a mature viscosity that meets the process requirements, a UPGM 203 molded plate is obtained by hot pressing, and the hot pressing process is as follows: a preheating temperature of 95-110°C, a pressing pressure of 200-220 bar, a pressing time of 25-35 minutes, and the upper and lower molds are heated and pressed on both sides; a first curing temperature of 145-155°C, a pressing pressure of 200-220 bar, and a pressing time of 45-55 minutes, and the upper mold is heated and pressed on one side; a second curing temperature of 95-110°C, a pressing pressure of 200-220 bar, and a pressing time of 8-12 minutes, and the upper and lower molds are heated and pressed on both sides; and cooling to obtain the molded plate.

6. The method for preparing a thick rigid plate-shaped insulating material according to claim 5, characterized in that: The hot pressing process is as follows: preheating temperature is 100°C, pressing pressure is 210 bar, pressing time is 30 minutes, and both sides of the upper and lower molds are heated and pressed; the first curing temperature is 150°C, pressing pressure is 210 bar, pressing time is 50 minutes, and one side of the upper mold is heated and pressed; the second curing temperature is 100°C, pressing pressure is 210 bar, pressing time is 10 minutes, and both sides of the upper and lower molds are heated and pressed; cooling is performed to obtain a molded plate.

7. The method for preparing a thick rigid plate-shaped insulating material according to claim 5, characterized in that: The impregnation amount of the film is 450g / m 2 The thickening process is to place the fabric in a thickening room at 50-60°C for 48 hours.

8. A method for preparing a thick rigid plate-shaped insulating material according to claim 5 or 6, characterized in that: The dimensions of the molded plate are 80±2mm*1230*2100mm, and the total weight is 372kg.

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