High-performance silica gel film and preparation method thereof

Abstract

The invention discloses a high-performance silica gel membrane, and relates to the technical field of silica gel membrane preparation, and the silica gel membrane formula comprises the following components by weight: 40-60 parts of polysiloxane; 20 to 30 parts of liquid silica gel; 10 to 15 parts of phenyl vinyl silicone oil; 1-2 parts of an organosilicon catalyst; 0.5-1 part of zinc oxide; 2-3 parts of an antistatic agent; 0.5 to 1 part of a nonionic surfactant; 5-10 parts of an auxiliary agent; the auxiliaries are an oily dispersant, a defoaming agent, a base material wetting agent, a curing agent and silicone resin. According to the high-performance silica gel film and the preparation method thereof, the arrangement mode that polysiloxane and liquid silica gel are matched is utilized, so that the prepared high-performance silica gel film can be stably used for a long time within the temperature ranging from-60 DEG C to 200 DEG C, has excellent wear resistance, ultraviolet resistance, oxidation resistance and corrosion resistance, and meanwhile, due to the arrangement of the antistatic agent, the service life of the high-performance silica gel film is prolonged. And the front and back surfaces of the silica gel film can be subjected to anti-static protection, so that the anti-static performance is improved, the aging layering phenomenon of the silica gel film at high temperature is reduced, and the adhesion and weather resistance of the silica gel film during use are improved.

Description

Technical Field

[0001] The invention relates to the technical field of silica gel film preparation, and in particular to a high-performance silica gel film and a preparation method thereof. Background Art

[0002] Silicone membrane is a material with broad application prospects. Its unique properties make it play an important role in many fields. The commonly used raw materials for preparing silicone membranes include polysiloxane, VMQ silicone resin, platinum catalyst, methyl hydrogen polysiloxane and acetylene alcohol, etc. The raw materials are mixed evenly in a mixing equipment to form a raw material mixture of silicone film, which is then cured to form a membrane material.

[0003] The existing silicone film has a single antistatic performance after preparation, and due to the sensitivity of the silicone film material to temperature, the silicone film is prone to stratification and aging under extremely high temperatures, resulting in the need to improve the fit and weather resistance of the silicone film after long-term use at high temperatures. Summary of the invention

[0004] The object of the present invention is to provide a high-performance silica gel membrane and a preparation method thereof to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a high-performance silicone film, wherein the silicone film formula comprises the following components by weight:

[0006] 40-60 parts of polysiloxane;

[0007] 20-30 parts of liquid silicone;

[0008] 10-15 parts of phenyl vinyl silicone oil;

[0009] 1-2 parts of organosilicon catalyst;

[0010] Zinc oxide 0.5-1 part;

[0011] 2-3 parts of antistatic agent;

[0012] 0.5-1 part of nonionic surfactant;

[0013] 5-10 parts of additives;

[0014] The polysiloxane and liquid silicone are stirred in a reaction kettle for 2-10 hours until a uniform solution is formed. The auxiliary agents are an oily dispersant, a defoamer, a substrate wetting agent, a curing agent and a silicone resin, and the addition ratio of the oily dispersant, the defoamer, the substrate wetting agent, the curing agent and the silicone resin is 1:1:1:1:1.

[0015] Preferably, the oily dispersant includes a silane coupling agent and a titanate coupling agent or any one of them, and the added amount of the oily dispersant is 1-2 parts.

[0016] Preferably, the curing agent includes isocyanate and epoxy curing agent or any one of them, and the added amount of the curing agent is 1-2 parts.

[0017] The present invention also provides a method for preparing a high-performance silica gel membrane, the method comprising:

[0018] Step 1: Accurately weigh the raw materials of each component, and stir and mix the polysiloxane and liquid silicone in a reaction kettle;

[0019] Step 2: Add the vinyl silicone oil and zinc oxide to the above mixed solution, stir for 3-5 hours, then add the nonionic surfactant and antistatic agent, continue to stir for 3-5 hours, then add the organosilicon catalyst, stir for 6-10 hours, finally add the oily dispersant, defoamer, substrate wetting agent, curing agent and silicone resin, continue to stir for 4-10 hours, until a uniform silica gel composition is formed;

[0020] Step 3: prepare an ultra-thin PET film substrate, apply the above silicone composition on one side of the ultra-thin PET film substrate, apply a layer of silicone pressure-sensitive adhesive on the applied silicone composition, and attach a PET release film, and apply an antistatic agent layer on the other side of the ultra-thin PET film substrate to form a silicone film;

[0021] Step 4: Send the coated silicone film into the oven for heating and curing. After curing, a high-performance silicone film is formed. The silicone film is die-cut and packaged.

[0022] Preferably, in the step 2, the oily dispersant, defoamer, substrate wetting agent, curing agent and silicone resin are added in batches, and each time a material is added, stirring is continued for 0.8-2 hours.

[0023] Preferably, in the step three, a blade coater is used to evenly coat the silica gel composition on the surface of the ultra-thin PET film substrate, and the PET film substrate is pretreated before coating.

[0024] Preferably, in step three, the coating of a layer of the organic silicone pressure-sensitive adhesive can only be carried out after the surface of the silicone composition is naturally cured to form a cured film.

[0025] Preferably, the PET release film in step 3 needs to be pasted within 30-120 seconds of the coating of the silicone pressure-sensitive adhesive, and the antistatic agent layer is evenly coated by a doctor blade coater.

[0026] Preferably, in step 4, the temperature of the oven for heating and curing the silicone film is set to 160-200 degrees Celsius.

[0027] Preferably, in step 4, the curing time of the silicone film being heated and cured in the oven is 100-120 seconds.

[0028] Technical effects and advantages of the present invention:

[0029] (1) The present invention utilizes a configuration in which polysiloxane and liquid silicone are matched, so that the high-performance silicone film prepared therefrom can be used stably for a long time within a temperature range of -60 degrees Celsius to 200 degrees Celsius, and has excellent wear resistance, UV resistance, oxidation resistance and corrosion resistance. At the same time, by configuring an antistatic agent, both the front and back sides of the silicone mold can be protected against static electricity, thereby improving the antistatic performance, reducing the aging and delamination phenomenon of the silicone mold at high temperatures, and improving the adhesion and weather resistance of the silicone film during use;

[0030] (2) The present invention utilizes a nonionic surfactant and an auxiliary agent in combination to facilitate the preparation of ingredients, so that they can be more evenly dispersed and emulsified, thereby improving the stability and uniformity of the formula, helping the formula to better adhere to the substrate, avoiding the aggregation and precipitation of oily substances, and preventing the oily substances from being oxidized or decomposed, thereby improving the stability of the formula, so that the high-performance silicone film formed has excellent insulation properties, anti-aging properties and chemical stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of the high-performance silica gel membrane of the present invention.

[0032] Figure 2 The figure is a process flow chart for preparing the high-performance silica gel membrane of the present invention.

[0033] In the figure: 1. PET substrate; 2. Silicone combination layer; 3. Silicone pressure-sensitive adhesive layer; 4. Release film; 5. Antistatic layer. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The present invention provides Figure 1-2 A high-performance silicone membrane is shown, and the silicone membrane formula weight parts include:

[0036] 40-60 parts of polysiloxane;

[0037] 20-30 parts of liquid silicone;

[0038] 10-15 parts of phenyl vinyl silicone oil;

[0039] 1-2 parts of organosilicon catalyst;

[0040] Zinc oxide 0.5-1 part;

[0041] 2-3 parts of antistatic agent;

[0042] 0.5-1 part of nonionic surfactant;

[0043] 5-10 parts of additives;

[0044] The polysiloxane and liquid silicone are stirred in a reaction kettle for 2-10 hours until a uniform solution is formed. The additives are an oily dispersant, a defoamer, a substrate wetting agent, a curing agent and a silicone resin, and the addition ratio of the oily dispersant, the defoamer, the substrate wetting agent, the curing agent and the silicone resin is 1:1:1:1:1. The oily dispersant includes a silane coupling agent and a titanate coupling agent or any one of them. The added amount of the oily dispersant is 1-2 parts. The curing agent includes an isocyanate and an epoxy curing agent or any one of them. The added amount of the curing agent is The amount is 1-2 parts. The oily dispersant can improve the dispersibility and stability of the oily substance in the solvent, prevent the oily substance from being oxidized or decomposed, and improve the stability of the above formula during preparation. The defoaming agent is used as an auxiliary agent to destroy and inhibit the generation of foam, reduce the foam effect during the solution preparation process, prevent the solution from precipitating or stratifying, and through the substrate wetting agent, reduce the surface tension of the liquid, so that the wettability and permeability of the substrate are higher. The curing agent and silicone resin can improve the curing efficiency of the prepared silicone composition and improve the efficiency of silicone mold preparation.

[0045] The present invention also provides a method for preparing a high-performance silica gel membrane, the method comprising:

[0046] Step 1: Accurately weigh the raw materials of each component, and stir and mix the polysiloxane and liquid silicone in a reaction kettle;

[0047] Step 2: Add the vinyl silicone oil and zinc oxide to the above mixed solution, stir for 3-5 hours, then add nonionic surfactant and antistatic agent, continue stirring for 3-5 hours, then add organosilicon catalyst, stir for 6-10 hours, finally add oily dispersant, defoamer, substrate wetting agent, curing agent and silicone resin, continue stirring for 4-10 hours, until a uniform silica gel composition is formed, wherein the oily dispersant, defoamer, substrate wetting agent, curing agent and silicone resin are added in batches, and each added material needs to be stirred for 0.8-2 hours;

[0048] Step 3: prepare an ultra-thin PET film substrate, apply the above-mentioned silicone composition on one side of the ultra-thin PET film substrate, use a scraper coater to evenly apply the silicone composition on the surface of the ultra-thin PET film substrate, and pre-treat the PET film substrate before coating. The pre-treatment of the PET film substrate includes plasma treatment or corona treatment to improve the adhesion of the coating layer, and then apply a layer of silicone pressure-sensitive adhesive on the coated silicone composition. The silicone pressure-sensitive adhesive needs to be naturally cured on the surface of the silicone composition to form a cured film before the silicone pressure-sensitive adhesive can be applied, and a PET release film is attached. The PET release film needs to be attached within 30-120S of the silicone pressure-sensitive adhesive coating. An antistatic agent layer is applied on the other side of the ultra-thin PET film substrate, and the antistatic agent layer is evenly coated by a scraper coater to form a silicone film;

[0049] Step 4: Send the coated silicone film into the oven for heating and curing. The temperature of the oven for heating and curing the silicone film is set to 160-200 degrees Celsius. The curing time of the oven for heating and curing the silicone film is 100-120S. After curing, a high-performance silicone film is formed, and the silicone film is die-cut and packaged.

[0050] The structure of the prepared high-performance silica gel membrane is as follows Figure 1 As shown, the surface of the PET substrate 1 is coated with a silicone combination layer 2, the PET substrate 1 is a PET film substrate, the silicone combination layer 2 is coated with a silicone composition, the upper surface of the silicone combination layer 2 is coated with a silicone pressure-sensitive adhesive layer 3, the surface of the silicone pressure-sensitive adhesive layer 3 is bonded with a release film 4, and the lower surface of the PET substrate 1 is coated with an antistatic layer 5, the antistatic layer 5 is composed of a uniformly coated antistatic agent layer. The prepared high-performance silicone film can be used stably for a long time within -60 degrees Celsius to 200 degrees Celsius, and has excellent wear resistance, UV resistance, oxidation resistance and corrosion resistance. At the same time, through the setting of the antistatic agent, the front and back sides of the silicone mold can be protected against static electricity, thereby improving the antistatic performance, reducing the aging and stratification phenomenon of the silicone mold at high temperature, and improving the fit and weather resistance of the silicone film during use.

[0051] Embodiment 1

[0052] Step 1: Accurately weigh the following raw materials: 45 parts of polysiloxane; 30 parts of liquid silicone; 14 parts of phenyl vinyl silicone oil; 1 part of organosilicon catalyst; 1 part of zinc oxide; 3 parts of antistatic agent; 1 part of nonionic surfactant; 1 part of oily dispersant, 1 part of defoamer, 1 part of substrate wetting agent, 1 part of curing agent and 1 part of silicone resin, and stir and mix the polysiloxane and liquid silicone in a reaction kettle;

[0053] Step 2: Add the vinyl silicone oil and zinc oxide to the above mixed solution, stir for 3 hours, then add the nonionic surfactant and antistatic agent, continue stirring for 5 hours, then add the organosilicon catalyst, stir for 6 hours, and finally add the oil dispersant, defoamer, substrate wetting agent, curing agent and silicone resin in batches, and continue stirring for 2 hours each time a material is added until a uniform silicone composition is formed;

[0054] Step 3: prepare an ultra-thin PET film substrate, apply the above-mentioned silicone composition on one side of the ultra-thin PET film substrate, use a scraper coater to evenly apply the silicone composition on the surface of the ultra-thin PET film substrate, and pre-treat the PET film substrate before coating. The pre-treatment of the PET film substrate includes plasma treatment or corona treatment to improve the adhesion of the coating layer, and then apply a layer of silicone pressure-sensitive adhesive on the coated silicone composition. The silicone pressure-sensitive adhesive needs to be naturally cured on the surface of the silicone composition to form a cured film before the silicone pressure-sensitive adhesive can be applied, and a PET release film is attached. The PET release film needs to be attached within 100 seconds of the silicone pressure-sensitive adhesive coating. An antistatic agent layer is applied on the other side of the ultra-thin PET film substrate, and the antistatic agent layer is evenly coated by a scraper coater to form a silicone film;

[0055] Step 4: Send the coated silicone film into an oven for heating and curing. The temperature of the oven for heating and curing the silicone film is set to 200 degrees Celsius. The curing time of the oven for heating and curing the silicone film is 100 seconds. After curing, a high-performance silicone film is formed, and the silicone film is die-cut and packaged.

[0056] Embodiment 2

[0057] Step 1: Accurately weigh the following raw materials: 55 parts of polysiloxane; 25 parts of liquid silicone; 10 parts of phenyl vinyl silicone oil; 1 part of organosilicon catalyst; 1 part of zinc oxide; 3 parts of antistatic agent; 1 part of nonionic surfactant; 0.8 parts of oily dispersant, 0.8 parts of defoaming agent, 0.8 parts of substrate wetting agent, 0.8 parts of curing agent and 0.8 parts of silicone resin, and stir and mix the polysiloxane and liquid silicone in a reaction kettle;

[0058] Step 2: Add the vinyl silicone oil and zinc oxide to the above mixed solution, stir for 3 hours, then add the nonionic surfactant and antistatic agent, continue stirring for 5 hours, then add the organosilicon catalyst, stir for 6 hours, and finally add the oil dispersant, defoamer, substrate wetting agent, curing agent and silicone resin in batches, and continue stirring for 2 hours each time a material is added until a uniform silicone composition is formed;

[0059] Step 3: prepare an ultra-thin PET film substrate, apply the above-mentioned silicone composition on one side of the ultra-thin PET film substrate, use a scraper coater to evenly apply the silicone composition on the surface of the ultra-thin PET film substrate, and pre-treat the PET film substrate before coating. The pre-treatment of the PET film substrate includes plasma treatment or corona treatment to improve the adhesion of the coating layer, and then apply a layer of silicone pressure-sensitive adhesive on the coated silicone composition. The silicone pressure-sensitive adhesive needs to be naturally cured on the surface of the silicone composition to form a cured film before the silicone pressure-sensitive adhesive can be applied, and a PET release film is attached. The PET release film needs to be attached within 100 seconds of the silicone pressure-sensitive adhesive coating. An antistatic agent layer is applied on the other side of the ultra-thin PET film substrate, and the antistatic agent layer is evenly coated by a scraper coater to form a silicone film;

[0060] Step 4: Send the coated silicone film into the oven for heating and curing. The temperature of the oven for heating and curing the silicone film is set to 160 degrees Celsius. The curing time of the oven for heating and curing the silicone film is 120 seconds. After curing, a high-performance silicone film is formed, and the silicone film is die-cut and packaged.

[0061] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-performance silicone membrane, characterized in that: The silicone film formula comprises the following components in parts by weight: 40-60 parts of polysiloxane; 20-30 parts of liquid silicone; 10-15 parts of phenyl vinyl silicone oil; 1-2 parts of organosilicon catalyst; Zinc oxide 0.5-1 part; 2-3 parts of antistatic agent; 0.5-1 part of nonionic surfactant; 5-10 parts of additives; The polysiloxane and liquid silicone are stirred in a reaction kettle for 2-10 hours until a uniform solution is formed. The auxiliary agents are an oily dispersant, a defoamer, a substrate wetting agent, a curing agent and a silicone resin, and the addition ratio of the oily dispersant, the defoamer, the substrate wetting agent, the curing agent and the silicone resin is 1:1:1:1:

1.

2. A high performance silicone membrane according to claim 1, characterized in that: The oily dispersant includes a silane coupling agent and a titanate coupling agent or any one of them, and the added amount of the oily dispersant is 1-2 parts.

3. A high performance silicone membrane according to claim 1, characterized in that: The curing agent includes isocyanate and epoxy curing agent or any one of them, and the added amount of the curing agent is 1-2 parts.

4. A method for preparing a high-performance silica gel membrane according to any one of claims 1 to 3, characterized in that: The method comprises: Step 1: Accurately weigh the raw materials of each component, and stir and mix the polysiloxane and liquid silicone in a reaction kettle; Step 2: Add the vinyl silicone oil and zinc oxide to the above mixed solution, stir for 3-5 hours, then add the nonionic surfactant and antistatic agent, continue to stir for 3-5 hours, then add the organosilicon catalyst, stir for 6-10 hours, finally add the oily dispersant, defoamer, substrate wetting agent, curing agent and silicone resin, continue to stir for 4-10 hours, until a uniform silica gel composition is formed; Step 3: prepare an ultra-thin PET film substrate, apply the above silicone composition on one side of the ultra-thin PET film substrate, apply a layer of silicone pressure-sensitive adhesive on the applied silicone composition, and attach a PET release film, and apply an antistatic agent layer on the other side of the ultra-thin PET film substrate to form a silicone film; Step 4: Send the coated silicone film into an oven for heating and curing. After curing, a high-performance silicone film is formed, and the silicone film is die-cut and packaged.

5. The method for preparing a high-performance silica gel membrane according to claim 4, characterized in that: In the step 2, the oily dispersant, defoamer, substrate wetting agent, curing agent and silicone resin are added in batches, and each time a material is added, stirring is continued for 0.8-2 hours.

6. The method for preparing a high-performance silica gel membrane according to claim 4, characterized in that: In the step three, a blade coater is used to evenly coat the silica gel composition on the surface of the ultra-thin PET film substrate, and the PET film substrate is pretreated before coating.

7. The method for preparing a high-performance silica gel membrane according to claim 4, characterized in that: In the step 3, a layer of organic silicone pressure-sensitive adhesive can be applied only after the silicone composition surface is naturally cured to form a cured film.

8. The method for preparing a high-performance silica gel membrane according to claim 4, characterized in that: In the step 3, the PET release film needs to be pasted within 30-120 seconds of the coating of the silicone pressure-sensitive adhesive, and the antistatic agent layer is evenly coated by a doctor blade coater.

9. The method for preparing a high-performance silica gel membrane according to claim 4, characterized in that: In the step 4, the temperature of the oven for heating and curing the silicone film is set to 160-200 degrees Celsius.

10. The method for preparing a high-performance silica gel membrane according to claim 4, characterized in that: In the step 4, the curing time of the silicone film in the oven for heating and curing is 100-120S.

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