Melamine glass cloth laminate and process for producing the same

Abstract

The application relates to the field of laminated board production processes, and particularly discloses a melamine glass cloth laminated board and a production process thereof. The production process of the melamine glass cloth laminated board comprises the following steps: using a modified melamine adhesive, taking alkali-free glass cloth as a base material, carrying out gluing, baking, laminating and hot pressing to obtain the melamine glass cloth laminated board; the modified melamine adhesive comprises the following components in mass fractions: 25-35 parts of melamine, 40-50 parts of paraformaldehyde, 4-10 parts of hydroxyl silicone oil, 20-30 parts of ethanol and 3-10 parts of modified nano-aluminum oxide. The melamine glass cloth laminated board prepared by the application has the advantage of better impact strength.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of laminated board production, in particular to a melamine glass cloth laminated board and a production process thereof. BACKGROUND

[0002] With the development of motor performance, the requirements for the market for insulating laminated boards are also increasing. Insulating laminated boards not only need to have good mechanical properties and electrical insulation properties, but also need to have good long-term thermal stability, thereby promoting the further development of motor insulating laminated boards in the direction of high heat and moisture resistance and high performance. The development of environmentally friendly halogen-free flame-retardant high-temperature and moisture-resistant electric halogen-free flame-retardant glass cloth laminated board is a new trend of halogen-free flame-retardant insulating materials.

[0003] The melamine glass cloth laminated board is made of alkali-free glass cloth substrate and melamine formaldehyde resin as adhesive, and is obtained by drying and hot pressing. The melamine formaldehyde resin has low toxicity, high flame retardant efficiency, good heat resistance, and good smoke suppression effect, and the structure contains a triazine ring, so that the melamine resin has excellent tracking resistance and arc extinction. The melamine glass cloth laminated board has good arc resistance and certain dielectric properties, and can be used as an arc-resistant material.

[0004] However, the triazine ring structure has large steric hindrance, and the multiple methylene groups of the melamine formaldehyde resin are interlaced with the triazine ring, so that the hardness of the cured melamine resin is large, it is not easy to bend, and the toughness is extremely poor. When in a high humidity environment, the cured melamine formaldehyde resin absorbs water and causes volume change, resulting in internal stress, resin cracking, and affecting the impact resistance of the melamine glass cloth laminated board and the use stability of the melamine glass cloth laminated board. Therefore, it needs to be improved. SUMMARY

[0005] In order to improve the impact resistance of the melamine glass cloth laminated board, the present application provides a melamine glass cloth laminated board and a production process thereof.

[0006] In the first aspect, the present application provides a production process of a melamine glass cloth laminated board, which adopts the following technical scheme:

[0007] A production process of a melamine glass cloth laminated board, comprising the following steps:

[0008] A modified melamine adhesive is used, an alkali-free glass cloth is used as a substrate, and the melamine glass cloth laminated board is obtained by gluing, baking, laminating, and hot pressing.

[0009] The modified melamine adhesive comprises the following components in mass fraction:

[0010] 25-35 parts of melamine,

[0011] 40-50 parts of paraformaldehyde,

[0012] 4-10 parts of hydroxy silicone oil,

[0013] 20-30 parts of ethanol,

[0014] 3-10 parts of modified nano-alumina.

[0015] By adopting the above technical solution, the active groups in the hydroxy silicone oil can react with the imine groups on the melamine to form a block structure, participate in the co-condensation of the melamine resin, insert the organic silicon chain segment into the resin macromolecule, change the resin structure, increase the distance between the triazine ring structures, and improve the flexibility of the melamine resin system; and introduce silicon-oxygen bonds with longer bond lengths and larger bond angles into the resin system, thereby increasing the flexible chain segments in the resin macromolecule and further achieving a toughening effect; the modified nano-alumina has strong insulation and heat resistance, can improve the arc resistance and heat resistance of the melamine resin system, and can play a reinforcing and toughening role; the modified nano-alumina is dispersed in the melamine resin system, plays a physical barrier role between the triazine ring structures, and helps to improve the toughness of the melamine resin system;

[0016] By improving the flexibility of the cured melamine resin, the possibility of cracking and peeling of the resin is reduced, the structural stability of the melamine glass cloth laminate is improved, and the impact strength of the melamine glass cloth laminate is improved, which is conducive to ensuring the stable performance of the melamine glass cloth laminate.

[0017] Preferably, the production process specifically includes:

[0018] The alkali-free glass cloth is immersed in a modified melamine adhesive and glued to obtain a prefabricated glued cloth;

[0019] Multiple layers of prefabricated adhesive tape are stacked to obtain an adhesive tape layer group; multiple groups of adhesive tape layer groups are stacked, each group of adhesive tape layer groups is separated by a metal plate, and each metal plate is separated from any adhesive tape layer group by a release paper to obtain a laminate group to be pressed; metal plates and buffer pads are sequentially arranged on the outer layer of the laminate group to be pressed, and a hot pressing treatment is performed, and then the individual adhesive tape layer groups are separated to obtain a melamine glass cloth laminate.

[0020] Preferably, the pressing temperature of the hot pressing treatment is 155-170°C, the pressing pressure is 15-20 MPa, and the pressing cooling temperature is 40-60°C.

[0021] By adopting the technical scheme, the melamine resin adhesive cures to bond the multiple layers of the alkali-free glass cloth together to form the melamine glass cloth laminate, so that the melamine glass cloth laminate has better arc resistance and heat resistance, and has excellent mechanical strength, so that the melamine glass cloth laminate has better impact resistance.

[0022] Preferably, the preparation method of the modified melamine adhesive comprises the following steps:

[0023] The formula amount of melamine, hydroxyl silicone oil and polyformaldehyde are mixed with ethanol, the pH value is adjusted to 8-9, and stirring reaction is carried out at 80-90 DEG C for 0.5-1h, then the formula amount of modified nano-alumina is added, stirring reaction is carried out at 60-80 DEG C for 1-2h, cooling to 40-60 DEG C, stirring for 10-20min, cooling to room temperature, and the modified melamine adhesive is obtained.

[0024] By adopting the technical scheme, the melamine resin adhesive cures to bond the multiple layers of the alkali-free glass cloth together to form the melamine glass cloth laminate, so that the melamine glass cloth laminate has better arc resistance and heat resistance, and has excellent mechanical strength, so that the melamine glass cloth laminate has better impact resistance.

[0025] Preferably, the modified nano-alumina is obtained by coating nano-alumina with silicon dioxide and then surface-modifying the nano-alumina with amino silane coupling agent, and the modification step specifically comprises:

[0026] The nano-alumina particles are added to anhydrous ethanol, ultrasonic dispersion is carried out, the pH value is adjusted to 7-9, tetraethyl orthosilicate is added dropwise, stirring reaction is carried out for 1-2h, centrifugation, washing and drying are carried out, and the silicon dioxide-coated nano-alumina is obtained.

[0027] The silicon dioxide-coated nano-alumina is mixed with amino silane coupling agent, high-speed blending is carried out for 30-40min, heat preservation is carried out at 180-200 DEG C for 90-150min, washing and drying are carried out, and the modified nano-alumina is obtained.

[0028] By adopting the technical scheme, the possibility of nano-alumina agglomeration is reduced, and the dispersion degree of nano-alumina is improved; under alkaline conditions, tetraethyl orthosilicate hydrolyzes to form a silicon dioxide coating layer on the surface of nano-alumina, which helps to reduce the surface energy of nano-alumina and reduce the agglomeration of nano-alumina, and the silicon dioxide coating layer has a porous structure and a large number of active silicon hydroxyl groups on the surface, so the reaction activity between the silicon dioxide coating layer and the amino silane coupling agent is high, the amino silane coupling agent is grafted on the silicon dioxide coating layer, and the compatibility of the modified nano-alumina with the organic resin system is improved, thereby further promoting the uniform dispersion of the modified nano-alumina.

[0029] Preferably, the mass ratio of the nano-alumina and tetraethyl orthosilicate is 1:(1-3), and the mass ratio of the silica-coated nano-alumina and the amino silane coupling agent is 1:(0.4-0.6).

[0030] Preferably, the amino silane coupling agent is selected from a combination of one or more of N-beta-(aminoethyl)-gamma-aminopropylmethyldimethoxysilane, gamma-aminoethyl aminopropyl trimethoxysilane, gamma-aminopropyl triethoxysilane, 3-aminopropyl trimethoxysilane.

[0031] Preferably, the particle size of the nano-alumina is 5-20 nm.

[0032] By adopting the above technical solution, the modified nano-alumina has better dispersion performance and toughening effect.

[0033] Preferably, the hydroxyl silicone oil is dihydroxy polydimethylsiloxane.

[0034] In a second aspect, the application provides a melamine glass cloth laminate, which adopts the following technical solution:

[0035] A melamine glass cloth laminate produced by the production process of the melamine glass cloth laminate.

[0036] By adopting the above technical solution, through the improvement of the melamine adhesive, the melamine glass cloth laminate has better toughness, the use effect of the melamine glass cloth laminate in a humid environment is improved, and the possibility of reducing the service life of the melamine glass cloth laminate due to resin cracking is reduced.

[0037] In summary, the application has the following beneficial effects:

[0038] 1. Since the melamine resin adhesive is improved in the application, the melamine resin system is chemically modified by using hydroxyl silicone oil, and the melamine resin system is physically modified by using modified nano-alumina, the toughness of the cured melamine resin is greatly improved, which is conducive to improving the impact resistance and mechanical strength of the melamine glass cloth laminate, and promoting the improvement of the use performance of the melamine glass cloth laminate.

[0039] 2. In the application, the nano-alumina is preferably coated and modified by using silica, and then the surface is modified by using an amino silane coupling agent, which reduces the possibility of agglomeration of the nano-alumina, improves the dispersion degree of the nano-alumina, further improves the flexibility of the cured melamine resin, and further promotes the improvement of the use performance of the melamine glass cloth laminate. DETAILED DESCRIPTION

[0040] The application will be further described in detail below in conjunction with the examples.

[0041] Preparation Example

[0042] Preparation Example 1

[0043] The present preparation example provides a modified nano-alumina oxide, and the preparation method is as follows:

[0044] 1 kg of nano-alumina oxide particles is added into 3 kg of anhydrous ethanol, ultrasonic dispersion is performed, a 1 mol / L sodium hydroxide solution is used to adjust the pH value to 8.5, 1 kg of tetraethyl orthosilicate is continuously added dropwise while stirring, stirring reaction is performed for 1.5 h, centrifugation is performed, washing with anhydrous ethanol is performed for 3 times, washing with water is performed for 3 times, and drying is performed at 140 ℃ to obtain silica-coated nano-alumina oxide.

[0045] 1 kg of the silica-coated nano-alumina oxide and 0.5 kg of an amino silane coupling agent are put into a high-speed mixer, blending is performed for 30 min, incubation is performed at 200 ℃ for 120 min, washing with water is performed for 4 times, and drying is performed at 80 ℃ to obtain modified nano-alumina oxide.

[0046] The particle size range of the nano-alumina oxide particles can be selected from 5-20 nm, and in the present preparation example, the average particle size of the nano-alumina oxide particles is 10 nm.

[0047] In the present preparation example, the amino silane coupling agent is γ-aminopropyl triethoxysilane, and specifically, it is a silane coupling agent KH-550.

[0048] Preparation Example 2

[0049] The present preparation example is different from the preparation example 1 only in that the preparation method of the modified nano-alumina oxide is as follows:

[0050] 1 kg of nano-alumina oxide particles is added into 3 kg of anhydrous ethanol, ultrasonic dispersion is performed, a 1 mol / L sodium hydroxide solution is used to adjust the pH value to 8.5, 2 kg of tetraethyl orthosilicate is continuously added dropwise while stirring, stirring reaction is performed for 1.5 h, centrifugation is performed, washing with anhydrous ethanol is performed for 3 times, washing with water is performed for 3 times, and drying is performed at 140 ℃ to obtain silica-coated nano-alumina oxide.

[0051] 1 kg of the silica-coated nano-alumina oxide and 0.5 kg of an amino silane coupling agent are put into a high-speed mixer, blending is performed for 30 min, incubation is performed at 200 ℃ for 120 min, washing with water is performed for 4 times, and drying is performed at 80 ℃ to obtain modified nano-alumina oxide.

[0052] Preparation Example 3

[0053] The present preparation example is different from the preparation example 1 only in that the preparation method of the modified nano-alumina oxide is as follows:

[0054] 1kg nano-alumina particles were added to 3kg anhydrous ethanol, ultrasonic dispersion, 1mol / L sodium hydroxide solution was used to adjust the pH value to 8.5, 3kg tetraethyl orthosilicate was continuously added dropwise while stirring, and the stirring reaction was carried out for 1.5h, centrifugation, washing with anhydrous ethanol for 3 times, washing with water for 3 times, and drying at 140℃ to obtain silica-coated nano-alumina;

[0055] 1kg of silica-coated nano-alumina and 0.5kg of amino silane coupling agent were put into a high-speed mixer, blended for 30min, incubated at 200℃ for 120min, washed with water for 4 times, and dried at 80℃ to obtain modified nano-alumina.

[0056] Preparation Example 4

[0057] The difference between this preparation example and Preparation Example 1 is only that the amino silane coupling agent is γ-aminopropyltrimethoxysilane, and the specific is silane coupling agent KH-792.

[0058] Preparation Example 5

[0059] The difference between this preparation example and Preparation Example 1 is only that the modified nano-alumina is amino silane coupling agent surface modified nano-alumina, and the preparation method is as follows:

[0060] 1kg nano-alumina particles and 0.5kg amino silane coupling agent were put into a high-speed mixer, blended for 30min, incubated at 200℃ for 120min, washed with water for 4 times, and dried at 80℃ to obtain modified nano-alumina.

[0061] Preparation Example 6

[0062] The difference between this preparation example and Preparation Example 1 is only that the modified nano-alumina is silica-coated nano-alumina, and the preparation method is as follows:

[0063] 1kg nano-alumina particles were added to 3kg anhydrous ethanol, ultrasonic dispersion, 1mol / L sodium hydroxide solution was used to adjust the pH value to 8.5, 1kg tetraethyl orthosilicate was continuously added dropwise while stirring, and the stirring reaction was carried out for 1.5h, centrifugation, washing with anhydrous ethanol for 3 times, washing with water for 3 times, and drying at 140℃ to obtain modified nano-alumina.

[0064] Example

[0065] Example 1

[0066] The embodiment discloses a production process of a melamine glass cloth laminated board, comprising the following steps:

[0067] Preparation of modified melamine adhesive: 3 kg of melamine, 4.6 kg of paraformaldehyde, 0.7 kg of hydroxyl silicone oil and 2.5 kg of ethanol were mixed, sodium hydroxide was added to adjust the pH value to 8.5, and stirred at 90°C for 40 min, then 0.7 kg of modified nano-alumina was added, and stirred at 70°C for 1.5 h, cooled to 50°C, stirred for 15 min, and cooled to room temperature to obtain a modified melamine adhesive;

[0068] The alkali-free glass cloth was immersed in the modified melamine adhesive to obtain a pre-coated glass cloth;

[0069] Five layers of pre-coated glass cloths were stacked to obtain a group of adhesive cloth layers, ten groups of adhesive cloth layers were stacked, each group of adhesive cloth layers was separated by a steel plate, and each steel plate was separated from any adhesive cloth layer by release paper to obtain a group of to-be-pressed layer plates;

[0070] The steel plates and buffer pads were arranged on the upper and lower outer layers of the group of to-be-pressed layer plates from inside to outside, and then hot pressing was performed, the pressing temperature was 160°C, the pressing pressure was 15 MPa, and the cooling temperature after pressing was 50°C, then the groups of adhesive cloth layers were separated to obtain a melamine glass cloth laminated plate.

[0071] In this embodiment, the hydroxyl silicone oil is dihydroxy polydimethylsiloxane, and the model number is JP-107; the modified nano-alumina is prepared by Preparation Example 1; the thickness of the alkali-free glass cloth is 0.14 mm.

[0072] Example 2

[0073] The difference between this embodiment and Example 1 is only that the preparation method of the modified melamine adhesive is as follows:

[0074] 2.5 kg of melamine, 4 kg of paraformaldehyde, 0.4 kg of hydroxyl silicone oil and 3 kg of ethanol were mixed, sodium hydroxide was added to adjust the pH value to 8.5, and stirred at 90°C for 40 min, then 1 kg of modified nano-alumina was added, and stirred at 70°C for 1.5 h, cooled to 50°C, stirred for 15 min, and cooled to room temperature to obtain a modified melamine adhesive.

[0075] Example 3

[0076] The difference between this embodiment and Example 1 is only that the preparation method of the modified melamine adhesive is as follows:

[0077] Mix 3.5 kg melamine, 5 kg paraformaldehyde, 1 kg hydroxyl silicone oil and 2 kg ethanol, add sodium hydroxide to adjust pH value to 8.5, stir and react at 90°C for 40 min, then add 0.3 kg modified nano-alumina, stir and react at 70°C for 1.5 h, cool to 50°C, stir for 15 min, cool to room temperature, to obtain modified melamine adhesive.

[0078] Example 4

[0079] The difference between this example and Example 1 is only that the modified nano-alumina is prepared according to Preparation Example 2.

[0080] Example 5

[0081] The difference between this example and Example 1 is only that the modified nano-alumina is prepared according to Preparation Example 3.

[0082] Example 6

[0083] The difference between this example and Example 1 is only that the modified nano-alumina is prepared according to Preparation Example 4.

[0084] Example 7

[0085] The difference between this example and Example 1 is only that the modified nano-alumina is prepared according to Preparation Example 5.

[0086] Example 8

[0087] The difference between this example and Example 1 is only that the modified nano-alumina is prepared according to Preparation Example 6.

[0088] Comparative Example

[0089] Comparative Example 1

[0090] The difference between this comparative example and Example 1 is only that unmodified melamine formaldehyde resin is used as adhesive, and the adhesive is prepared as follows:

[0091] Mix 3 kg melamine, 4.6 kg paraformaldehyde and 2.5 kg ethanol, add sodium hydroxide to adjust pH value to 8.5, stir and react at 90°C for 2 h, cool to 50°C, stir for 15 min, cool to room temperature, to obtain modified melamine adhesive.

[0092] Comparative Example 2

[0093] The difference between this comparative example and Example 1 is only that the modified melamine adhesive is prepared as follows:

[0094] Mix 3 kg melamine, 4.6 kg paraformaldehyde and 2.5 kg ethanol, add sodium hydroxide to adjust pH value to 8.5, stir and react at 90℃ for 40 min, then add 1.4 kg modified nano-alumina, stir and react at 70℃ for 1.5 h, cool to 50℃, stir for 15 min, cool to room temperature to obtain the modified melamine adhesive.

[0095] Comparative Example 3

[0096] The difference between this comparative example and Example 1 is only that the preparation method of the modified melamine adhesive is as follows:

[0097] Mix 3 kg melamine, 4.6 kg paraformaldehyde, 1.4 kg hydroxyl silicone oil and 2.5 kg ethanol, add sodium hydroxide to adjust pH value to 8.5, stir and react at 90℃ for 2 h, cool to 50℃, stir for 15 min, cool to room temperature to obtain the modified melamine adhesive.

[0098] Performance test

[0099] According to the method in the national standard GB / T 5130-1997 “Test method for industrial hard laminated board of thermosetting resin for electrical use”, the vertical layer bending strength and simply supported beam impact strength of the melamine glass cloth laminated board prepared in each example and each comparative example under normal conditions are detected;

[0100] The melamine glass cloth laminated board prepared in each example and each comparative example is soaked in water at 50℃ for 12 h, and then according to the method in the standard test GB / T 5130-1997, the simply supported beam impact strength of each melamine glass cloth laminated board after hydrothermal treatment is tested.

[0101] The results are summarized in Table 1.

[0102] Table 1

[0103]

[0104]

[0105] It can be seen from Example 1 and Comparative Examples 1-3 in combination with Table 1 that the chemical modification of the melamine resin system by adding hydroxyl silicone oil and the physical modification of the melamine resin system by adding modified nano-alumina are beneficial to improve the bending strength and impact resistance of the melamine glass cloth laminated board, and the impact resistance of the melamine glass cloth laminated board after hydrothermal treatment is also improved, which shows that the improvement of the melamine adhesive according to the method disclosed in the present application can improve the toughness of the melamine glass cloth laminated board, promote the improvement of the performance of the melamine glass cloth laminated board, and is also beneficial to ensure the stable performance of the melamine glass cloth laminated board in a high humidity environment.

[0106] It can be seen from the combination of Embodiment 1, Embodiments 4-5, Embodiments 7-8 and Table 1 that the silica coating modification and the coupling agent surface modification of the nano-alumina can promote the improvement of the bending strength, tensile strength and moisture resistance of the melamine glass cloth laminate, and help to improve the use stability of the melamine glass cloth laminate in a high humidity environment. This may be due to the fact that the silica coating layer and the silane coupling agent molecules are beneficial to improve the mechanical strength and insulation performance of the melamine glass cloth laminate, and the silica coating layer forms a microporous structure on the surface of the nano-alumina, and the surface has a large number of active silicon hydroxyl groups, which promotes the grafting and attachment of the amino silane coupling agent molecules, and further improves the compatibility of the modified nano-alumina and the melamine resin system.

[0107] It can be seen from the combination of Embodiment 1, Embodiment 6 and Table 1 that the type of amino silane coupling agent has little effect on the mechanical properties of the melamine glass cloth laminate.

[0108] The specific embodiments are only an explanation of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the present specification, and as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A production process for melamine glass cloth laminate, characterized in that: The following steps are involved: The modified melamine adhesive is used, and the alkali-free glass cloth is used as the base material. After gluing, baking, laminating and hot pressing, the melamine glass cloth laminate is obtained. The modified melamine adhesive comprises the following components in parts by mass: 25-35 parts of melamine, 40-50 parts of paraformaldehyde, 4-10 parts of hydroxy silicone oil, 20-30 parts of ethanol, 3-10 parts of modified nano-alumina; The preparation method of the modified melamine adhesive comprises the following steps: Mixing the formulated amount of melamine, hydroxy silicone oil, paraformaldehyde and ethanol, adjusting the pH value to 8-9, stirring and reacting at 80-90°C for 0.5-1h, then adding the formulated amount of modified nano-alumina, stirring and reacting at 60-80°C for 1-2h, cooling to 40-60°C, stirring for 10-20min, and cooling to room temperature to obtain a modified melamine adhesive; The modified nano-alumina is obtained by coating nano-alumina with silicon dioxide and then surface-modifying it with an aminosilane coupling agent. The modification steps specifically include: Add nano-alumina particles to anhydrous ethanol, disperse them by ultrasonication, adjust the pH value to 7-9, add tetraethyl orthosilicate dropwise, stir and react for 1-2 hours, centrifuge, wash, and dry to obtain silica-coated nano-alumina; The silica-coated nano-alumina is mixed with an aminosilane coupling agent, blended at high speed for 30-40 minutes, kept warm at 180-200° C. for 90-150 minutes, washed, and dried to obtain modified nano-alumina; The mass ratio of the nano-alumina to tetraethyl orthosilicate is 1:(1-3), and the mass ratio of the silica-coated nano-alumina to the aminosilane coupling agent is 1:(0.4-0.6).

2. The production process of the melamine glass cloth laminate according to claim 1, characterized in that: The production process specifically includes: The alkali-free glass cloth is immersed in a modified melamine adhesive and glued to obtain a prefabricated glued cloth; Laminating multiple layers of prefabricated adhesive tape to obtain an adhesive tape layer group; laminating multiple adhesive tape layer groups, separating each adhesive tape layer group by a metal plate, and separating each metal plate from any adhesive tape layer group by a release paper, to obtain a laminate group to be pressed; Metal plates and buffer pads are sequentially arranged on the outer layers of the laminate group to be laminated, and hot pressing treatment is performed. Then, the respective adhesive tape layer groups are separated to obtain a melamine glass cloth laminate.

3. The production process of the melamine glass cloth laminate according to claim 2, characterized in that: The pressing temperature of the hot pressing treatment is 155-170°C, the pressing pressure is 15-20Mpa, and the pressing cooling temperature is 40-60°C.

4. The production process of the melamine glass cloth laminate according to claim 1, characterized in that: The aminosilane coupling agent is selected from one or more combinations of N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, γ-aminoethylaminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, and 3-aminopropyltrimethoxysilane.

5. The production process of the melamine glass cloth laminate according to claim 1, characterized in that: The particle size of the nano-alumina is 5-20 nm.

6. The production process of the melamine glass cloth laminate according to claim 1, characterized in that: The hydroxy silicone oil is dihydroxy polydimethylsiloxane.

7. A melamine glass cloth laminate, characterized in that: The melamine glass cloth laminate is produced by the production process of any one of claims 1 to 6.

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