Double-sided Teflon organic silicon leather composite material and preparation method thereof

Abstract

The invention relates to the field of teflon materials, in particular to a double-sided teflon organic silicon leather composite material and a preparation method thereof.The double-sided teflon organic silicon leather composite material comprises a main body, the main body comprises a first teflon layer and a second teflon layer, and the first teflon layer and the second teflon layer are bonded together through a silica gel layer; the thickness of the first teflon layer and the thickness of the second teflon layer are 0.03-0.07 mm, the thickness of the silica gel layer is 0.08-0.12 mm, and the thickness of the main body is 0.18-0.22 mm. The two Teflon layers with the thickness of 0.05 mm are compounded, and the two Teflon layers are bonded together through the silica gel layer, so that the thickness of a main body reaches 0.2 mm, compared with a pure Teflon layer with the thickness of 0.2 mm, the composite material has high light transmittance and flexibility, creases are not prone to being generated when the composite material is bent, and the service life of the composite material is prolonged. The application matching degree of the composite material in high-standard fields such as high-end display components and intelligent equipment ornaments is enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of silicone materials, in particular to a double-sided Teflon silicone leather composite material and a preparation method thereof. BACKGROUND

[0002] Teflon film with a thickness of 0.05mm is widely loved due to its excellent light transmittance. Its surface not only has excellent stain resistance, but also has obvious hydrophobicity, which makes it outstanding in many application scenarios.

[0003] However, when the thickness of the Teflon film increases to 0.2mm, its flexibility will inevitably decrease, and it is easy to produce obvious creases when bending, and these creases are difficult to recover. This characteristic is extremely disadvantageous in the use process of intelligent devices, which may cause the device to make a wrong judgment on the product state, thereby affecting the overall performance. SUMMARY

[0004] To solve the above technical problems, the purpose of the present application is to provide a double-sided Teflon composite material with high light transmittance and good bending performance and a preparation method thereof.

[0005] The technical solution adopted by the present application to solve the problem is: a double-sided Teflon silicone leather composite material, comprising a main body, the main body comprising a first Teflon layer and a second Teflon layer, the first Teflon layer and the second Teflon layer being bonded together through a silica gel layer; the thickness of the first Teflon layer and the second Teflon layer is 0.03-0.07mm, the thickness of the silica gel layer is 0.08-0.12mm, and the thickness of the main body is 0.18-0.22mm.

[0006] As a further improvement of the above technical solution, the silica gel layer comprises an adhesive layer, and the raw materials of the adhesive layer comprise a tackifier, and the tackifier is an organosilicon modified epoxy silane.

[0007] As a further improvement of the above technical solution, the synthesis raw materials of the organosilicon modified epoxy silane comprise 3-(methacryloyloxy)propyl trimethoxysilane, 2-(3,4-epoxyoxirane)ethyl trimethoxysilane, hydroxyl polydimethylsiloxane, and tetrabutyl titanate.

[0008] As a further improvement of the above technical solution, the synthesis steps of the organosilicon modified epoxy silane are as follows: A1, 45-55g of the hydroxyl polydimethylsiloxane and 0.05-0.15g of the tetrabutyl titanate are put into a reactor for heating reaction, the reaction temperature is 70-80℃, and the reaction time is 1-2 hours.

[0009] A2, during the S1 reaction, slowly add the 3-(methacryloyloxy)propyl trimethoxysilane and 2-(3,4-epoxyoxirane)ethyl trimethoxysilane in 8-10 minutes.

[0010] A3, after the S1 reaction is completed, stop heating and cool to room temperature until the mixture is cooled to room temperature.

[0011] A4, add 3-4 g of activated carbon to the mixture after cooling in S3, stir and filter, and take the filtrate.

[0012] A5, vacuum distillation of the filtrate in S4, distillation temperature is 85-95℃, vacuum degree is 5mmHg, after vacuum distillation, the silicone modified epoxy silane is obtained.

[0013] As a further improvement of the above technical solution, the adhesive layer is made of the following raw materials by weight: first vinyl silicone oil 10-20 parts, first hydrogen-containing silicone oil 5-10 parts, first inhibitor 0.02-0.1 parts, first platinum catalyst 0.5-1 parts, tackifier 1-3 parts.

[0014] As a further improvement of the above technical solution, the silicone layer further comprises a light transmission layer, the main body is sequentially composed of a first iron fluoride layer, an adhesive layer, a light transmission layer and a second iron fluoride layer from bottom to top; the light transmission layer is made of the following raw materials by weight: second vinyl silicone oil 10-20 parts, vinyl MQ silicone resin 30-50 parts, second hydrogen-containing silicone oil 5-10 parts, second inhibitor 0.02-0.1 parts, second platinum catalyst 0.5-1 parts, antistatic agent 1-3 parts, silane coupling agent 1-3 parts.

[0015] A method for preparing a double-sided iron fluoride organic silicone leather composite material as described above, comprising the following steps: S1, the first vinyl silicone oil, the first hydrogen-containing silicone oil, the first inhibitor, the first platinum catalyst and the tackifier are put into a dispersion mixer, and dispersed and stirred for 10-20 minutes to obtain an adhesive layer material.

[0016] S2, the second vinyl silicone oil, the vinyl MQ silicone resin, the second hydrogen-containing silicone oil, the second inhibitor, the second platinum catalyst and the silane coupling agent are put into a dispersion mixer, and dispersed and stirred for 10-20 minutes to obtain a light transmission layer material.

[0017] S3, the adhesive layer material is coated on the upper surface of the first iron fluoride layer, and the thickness of the adhesive layer is controlled to be 0.03-0.07mm; then the light transmission layer material is coated on the upper surface of the adhesive layer, and the thickness of the light transmission layer is controlled to be 0.03-0.07mm; finally, the second iron fluoride layer is covered on the upper surface of the light transmission layer, and the composite material is obtained after the air is exhausted.

[0018] S4, the composite material in S3 is placed in an oven for stepwise temperature curing, first using a temperature increasing rate of 0.5℃ / min to increase to 100℃, and keeping the temperature for 15-20 minutes; then using a temperature increasing rate of 1℃ / min to increase to 120℃, and keeping the temperature for 15-20 minutes; finally using a temperature increasing rate of 1.5℃ / min to increase to 140℃, and keeping the temperature for 15-20 minutes, and finally decreasing to room temperature at a rate of 2℃ / min, to obtain a double-sided Teflon composite material.

[0019] The beneficial effects of the present application are: the present application composites two layers of Teflon layer with a thickness of 0.05mm, and the two layers of Teflon layer are bonded together by a silica gel layer, so that the main body thickness reaches 0.2mm. Compared with a pure Teflon layer with a thickness of 0.2mm, the present application has high light transmittance and softness, and the composite material is not prone to produce folds when bending, thereby enhancing the application matching degree of the composite material in high-standard fields such as high-end display assemblies and smart device ornaments. DETAILED DESCRIPTION

[0020] In all embodiments of the present application, the temperature and pressure are not particularly emphasized, and are normal temperature and pressure. The equipment is used according to the conventional setting.

[0021] To make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application is further described in detail below with specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0022] It is understood that the description is only exemplary and is not intended to limit the scope of the present application.

[0023] Embodiment one: a double-sided Teflon organic silica leather composite material, comprising a main body, the main body comprising a first Teflon layer, a silica gel layer and a second Teflon layer, the first Teflon layer and the second Teflon layer being bonded together by the silica gel layer; the silica gel layer comprises an adhesive layer and a light transmission layer; the main body comprises, from bottom to top, the first Teflon layer, the adhesive layer, the light transmission layer and the second Teflon layer; the thickness of the first Teflon layer and the second Teflon layer is 0.05mm, the thickness of the adhesive layer and the light transmission layer is 0.05mm, and the thickness of the main body is 0.2mm. The product composites two layers of 0.05mm Teflon through silica gel, fully utilizes the high light transmittance of 0.05mm thick Teflon film while ensuring the softness of the composite material, so that it does not produce folds when bending, avoids affecting the judgment of the product state by the equipment, and solves the technical difficulty that high light transmittance and softness are difficult to achieve at the same time, thereby effectively enhancing the application matching degree of the composite material in high-standard fields such as high-end display assemblies and smart device ornaments.

[0024] The silicone layer includes a bonding layer, the raw material of the bonding layer includes a tackifier, the tackifier uses silicone modified epoxy silane, the addition of silicone modified epoxy silane makes the bonding layer have excellent adhesion to the Teflon layer, can maintain stable under extreme high and low temperature conditions, and will not fall off.

[0025] The synthesis raw material of the silicone modified epoxy silane includes 3-(methacryloyloxy) propyl trimethoxysilane (CAS NO. 2530-85-0), 2-(3,4-epoxyoxirane) ethyl trimethoxysilane (CAS NO. 3388-04-03), hydroxydimethylsiloxane (CAS No. 70131-67-8), tetrabutyl titanate (CAS No. 5593-70-4); the synthesis steps of the silicone modified epoxy silane are as follows: A1, 50g of the hydroxydimethylsiloxane and 0.1g of the tetrabutyl titanate are put into a reactor for heating reaction, the reaction temperature is 75℃, and the reaction time is 2 hours; A2, during the S1 reaction process, the 3-(methacryloyloxy) propyl trimethoxysilane and the 2-(3,4-epoxyoxirane) ethyl trimethoxysilane are slowly added within 10 minutes; A3, after the S1 reaction is completed, stop heating and cool to room temperature until the mixed solution is cooled to room temperature; A4, 3.5g of activated carbon is added to the mixed solution after S3 cooling, stirred and filtered, and the filtrate is taken; A5, the filtrate in S4 is vacuum distilled, the distillation temperature is 85-95℃, the vacuum degree is 5mmHg, and the silicone modified epoxy silane is obtained after vacuum distillation.

[0026] The bonding layer is made of raw materials in the following weight proportions: 20 parts of first vinyl silicone oil, 8 parts of first hydrogen-containing silicone oil, 0.02 parts of first inhibitor, 0.5 parts (5000ppm) of first platinum catalyst, and 1 part of tackifier.

[0027] The silicone layer also includes a light transmission layer, which is made of raw materials in the following weight proportions: 20 parts of second vinyl silicone oil, 40 parts of vinyl MQ silicone resin, 8 parts of second hydrogen-containing silicone oil, 0.02 parts of second inhibitor, 0.5 parts (5000ppm) of second platinum catalyst, 1 part of antistatic agent, and 1 part of silane coupling agent (KH-570 coupling agent can be used but is not limited to).

[0028] The preparation method of Example 1 includes the following steps: S1, the first vinyl silicone oil, the first hydrogen-containing silicone oil, the first inhibitor, the first platinum catalyst, and the tackifier in the weight proportions are put into a dispersion mixer, dispersed and stirred for 15 minutes, and a bonding layer material is obtained; S2, the weight fraction of the second vinyl silicone oil, vinyl MQ silicone resin, second hydrogen-containing silicone oil, second inhibitor, second platinum-gold catalyst and silane coupling agent are put into a dispersion mixer, and dispersed and stirred for 15 minutes to obtain a light transmission layer material; S3, coating an adhesive layer material on the upper surface of the first iron fluoride layer, the thickness of the adhesive layer is controlled to be 0.05 mm; then coating the light transmission layer material on the upper surface of the adhesive layer, the thickness of the light transmission layer is controlled to be 0.05 mm; finally, covering the second iron fluoride layer on the upper surface of the light transmission layer, and obtaining a composite material after exhausting air; S4, the composite material in S3 is placed in an oven for stepwise temperature curing, first using a temperature rising rate of 0.5℃ / min to rise to 100℃, and keeping the temperature for 15 minutes; then using a temperature rising rate of 1℃ / min to rise to 120℃, and keeping the temperature for 15 minutes; finally, using a temperature rising rate of 1.5℃ / min to rise to 140℃, and keeping the temperature for 15 minutes, and finally using a speed of 2℃ / min to reduce to room temperature, to obtain a double-sided iron fluoride composite material.

[0029] The preparation method of the present application realizes firm combination among the four-layer structure through stepwise temperature curing, so that the composite material has excellent optical performance, and the light transmission rate is more than 91%, ensuring efficient light transmission.

[0030] Example two: the difference from example one is that the thickness of the first iron fluoride layer and the second iron fluoride layer is 0.07mm, and the thickness of the main body is 0.24mm.

[0031] Comparative example one: 0.05mm iron fluoride film.

[0032] Comparative example two: 0.2mm iron fluoride film.

[0033] The light transmission rate and bending performance of the obtained example one, example two, comparative example one and comparative example two are tested, and the test results are shown in the following table.

[0034]

[0035] The test method of the light transmission rate is: using a light transmission rate instrument to detect three random positions on different lengths of the composite material to obtain a test data set; The bending performance test method is: continuously bending the composite material, and the bending number is 1000 times.

[0036] From the test results of the above table, the light transmittance of the double-sided Teflon composite material is close to that of a 0.05mm Teflon film, and the light transmittance is more than 91%, fully exerting the high light transmittance of the 0.05mm thick Teflon film; at the same time, the 0.2mm Teflon film has multiple obvious creases after the bending test, while the double-sided Teflon composite material of the present application has no obvious creases after the bending test, and has excellent flexibility while maintaining good light transmittance.

[0037] The above are only preferred embodiments of the present application, and do not limit the patent scope of the present application, and any equivalent structural transformation made by the content of the present application, or directly or indirectly applied in other related technical fields, are included in the patent protection scope of the present application.

Claims

1.A double-sided Teflon silicone leather composite material, comprising a main body, characterized in that: the main body comprises a first Teflon layer and a second Teflon layer, and the first Teflon layer and the second Teflon layer are bonded together by a silica gel layer; the thickness of the first Teflon layer and the second Teflon layer is 0.03-0.07mm, the thickness of the silica gel layer is 0.08-0.12mm, and the thickness of the main body is 0.18-0.22mm. 2.The double-sided Teflon silicone leather composite material of claim 1, characterized in that: the silica gel layer comprises a bonding layer, and the raw material of the bonding layer comprises an adhesion promoter, and the adhesion promoter is an organosilicon modified epoxy silane. 3.The double-sided Teflon silicone leather composite material of claim 2, characterized in that: the raw material for synthesizing the organosilicon modified epoxy silane comprises 3-(methacryloyloxy)propyl trimethoxysilane, 2-(3,4-epoxyoxirane)ethyl trimethoxysilane, hydroxyl polydimethylsiloxane, and tetrabutyl titanate. the synthesis steps of the organosilicon modified epoxy silane are as follows: A1, 45-55g of the hydroxyl polydimethylsiloxane and 0.05-0.15g of the tetrabutyl titanate are put into a reactor for warming reaction, the reaction temperature is 70-80℃, and the reaction time is 1-2 hours; A2, during the reaction of S1, the 3-(methacryloyloxy)propyl trimethoxysilane and the 2-(3,4-epoxyoxirane)ethyl trimethoxysilane are slowly added within 8-10 minutes; A3, after the reaction of S1 is completed, the heating is stopped and the mixture is cooled at room temperature until the mixture is cooled to room temperature; 4. A double sided Teflon silicone leather composite as claimed in claim 3, wherein, A4, 3-4g of activated carbon is added to the mixture after cooling of S3, and after stirring, the mixture is filtered to obtain a filtrate; A5, the filtrate in S4 is subjected to vacuum distillation, and the organosilicon modified epoxy silane is obtained after vacuum distillation at a distillation temperature of 85-95℃. 5.The double-sided Teflon silicone leather composite material of claim 2, characterized in that: the bonding layer is made of raw materials in the following weight proportions: 10-20 parts of a first vinyl silicone oil, 5-10 parts of a first hydrogen-containing silicone oil, 0.02-0.1 parts of a first inhibitor, 0.5-1 parts of a first platinum catalyst, and 1-3 parts of an adhesion promoter. 6.The double-sided Teflon silicone leather composite material of claim 5, characterized in that: the silica gel layer further comprises a light-transmitting layer, and the main body comprises, from bottom to top, the first Teflon layer, the bonding layer, the light-transmitting layer, and the second Teflon layer; the light-transmitting layer is made of raw materials in the following weight proportions: 10-20 parts of a second vinyl silicone oil, 30-50 parts of a vinyl MQ silicone resin, 5-10 parts of a second hydrogen-containing silicone oil, 0.02-0.1 parts of a second inhibitor, 0.5-1 parts of a second platinum catalyst, 1-3 parts of an antistatic agent, and 1-3 parts of a silane coupling agent. the steps include: S1, the first vinyl silicone oil, the first hydrogen-containing silicone oil, the first inhibitor, the first platinum catalyst, and the adhesion promoter are put into a dispersion mixer, and are dispersed and stirred for 10-20 minutes to obtain a bonding layer material; ​ ​ ​ ​ ​ 7. A process for the production of a double sided Teflon silicone leather composite as claimed in claim 6, characterized in that, ​ S2, the weight fraction of the second vinyl silicone oil, vinyl MQ silicone resin, second hydrogen-containing silicone oil, second inhibitor, second platinum gold catalyst and silane coupling agent into the dispersion mixer, dispersion stirring 10-20 minutes, get light transmission layer material; S3, the first iron fluorine long layer on the upper surface of the coating layer material, the thickness of the adhesive layer is controlled to be 0.03-0.07mm; then the light transmission layer material is coated on the upper surface of the adhesive layer, and the thickness of the light transmission layer is controlled to be 0.03-0.07mm; finally, the second iron fluorine long layer is covered on the upper surface of the light transmission layer, and the composite material is obtained after the air is exhausted; S4, the composite material in S3 is placed in an oven for stepwise temperature curing. First, the temperature is raised to 100℃ at a rate of 0.5℃ / min, and the temperature is maintained at this temperature for 15-20 minutes; then the temperature is raised to 120℃ at a rate of 1℃ / min, and the temperature is maintained at this temperature for 15-20 minutes; finally, the temperature is raised to 140℃ at a rate of 1.5℃ / min, and the temperature is maintained at this temperature for 15-20 minutes, and finally the temperature is reduced to room temperature at a rate of 2℃ / min, and a double-sided iron fluorine long composite material is obtained.

Images