A silicone release agent, a release film, and a method for manufacturing the same

Abstract

The present application relates to the technical field of release film, in particular to a kind of organic silicon release agent, release film and preparation method thereof.The organic silicon release agent, by weight fraction, is prepared from the following components: polysiloxane composition 100 parts, hydrogen-containing crosslinking agent 0.5-5 parts, silicon hydrogen addition catalyst 0.5-5 parts, anchoring agent 0.5-5 parts and organic solvent 50-500 parts;Wherein, the polysiloxane composition includes long-chain polysiloxane containing vinyl and short-chain polysiloxane containing vinyl, and the mass ratio of long-chain polysiloxane containing vinyl to short-chain polysiloxane containing vinyl is (3-7):(3-7).The release film prepared using the release agent provided by the present application has better friction resistance, better adhesion and better peeling performance.

Description

Technical Field

[0001] This invention relates to the field of release film technology, and more specifically, to an organosilicon release agent, a release film, and a method for preparing the same. Background Technology

[0002] Release film, also known as release film or peeling film, is widely used in packaging, printing, screen printing, pad printing, nameplates, membrane switches, flexible circuits, insulating products, circuit boards, laser anti-counterfeiting, lamination, electronics, sealing materials, reflective materials, waterproof materials, pharmaceuticals (plaster paper), sanitary paper, adhesive products, die-cutting and stamping processing and other industries.

[0003] Silicone release agents have advantages such as good coating and film-forming properties, excellent release effect, and low technical threshold, making them the most widely researched and applied type of release agent. However, release films made using existing silicone release agents are difficult to simultaneously possess good abrasion resistance, good adhesion, and good peel performance. The adhesion between the release layer and the substrate layer in the release film is poor, and the release layer will experience wear during the winding, transportation, and die-cutting processes, leading to a decrease in the smoothness and flatness of the film surface and peel performance, thus affecting the performance of the release film. Summary of the Invention

[0004] The technical problem solved by this invention is that release films made using existing silicone release agents are difficult to simultaneously possess good abrasion resistance, good adhesion performance, and good peel performance.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] An organosilicon release agent, by weight, is formulated from the following components: 100 parts of a polysiloxane composition, 0.5-5 parts of a hydrogen-containing crosslinking agent, 0.5-5 parts of a hydrosilylation catalyst, 0.5-5 parts of an anchoring agent, and 50-500 parts of an organic solvent; wherein the polysiloxane composition comprises vinyl-containing long-chain polysiloxanes and vinyl-containing short-chain polysiloxanes, the mass ratio of the vinyl-containing long-chain polysiloxanes to the vinyl-containing short-chain polysiloxanes is (3-7):(3-7), the viscosity of the vinyl-containing short-chain polysiloxanes is 100-1000 mPa·s, and the viscosity of the vinyl-containing long-chain polysiloxanes is 150000-500000 mPa·s.

[0007] Preferably, the vinyl-containing short-chain polysiloxane is product 9106 manufactured by Dow Chemical Company; and the vinyl-containing long-chain polysiloxane is product G-300 manufactured by Hangzhou Sailikang New Material Technology Co., Ltd.

[0008] Preferably, the organic solvent includes at least one of 120# gasoline, toluene, and methyl ethyl ketone.

[0009] The present invention also provides a method for preparing a release film, comprising:

[0010] Step S1: Apply the silicone release agent as described above onto the substrate to obtain a wet release layer;

[0011] Step S2: Dry the wet release layer to form a release layer on the substrate, thereby obtaining a release film.

[0012] Preferably, in step S2, the drying process is carried out at a temperature of 90-200°C for 50-150 seconds.

[0013] Preferably, in step S1, the areal density of the wet release layer is 0.1-20 g / m³. 2 .

[0014] Preferably, the thickness of the substrate is 20-150 μm.

[0015] Preferably, the substrate is made of PET.

[0016] Preferably, in step S2, the thickness of the release layer is 1-2 μm.

[0017] The present invention also provides a release film, which is prepared by the above-described method for preparing release films.

[0018] Compared with existing technologies, the silicone release agent provided by this invention uses a specific ratio of high-viscosity vinyl-containing long-chain polysiloxanes and low-viscosity vinyl-containing short-chain polysiloxanes as the main components. During the curing process of the release agent, these main components can undergo an addition reaction under the action of a hydrogen-containing crosslinking agent and a hydrosilylation catalyst. The vinyl-containing short-chain polysiloxanes have higher reactivity and can form a coating with a high crosslinking density with the hydrogen-containing crosslinking agent during the addition reaction, thus giving the release film made with this release agent better peel performance. Due to the high viscosity of the vinyl-containing long-chain polysiloxanes, the release film made with this release agent has better abrasion resistance and better adhesion. In summary, the release film made using the release agent provided by this invention simultaneously possesses better abrasion resistance, better adhesion, and better peel performance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the process for preparing the release film in an embodiment of the present invention. Detailed Implementation

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] It should be noted that, unless otherwise specified, the features in the embodiments of this invention can be combined with each other. The terms "comprising," "including," "containing," and "having" are non-limiting, meaning that other steps and other components that do not affect the result can be added. The above terms cover the terms "composed of" and "substantially composed of." Unless otherwise specified, materials, equipment, and reagents are commercially available. It should be noted that the viscosity of all substances in this invention refers to the viscosity of the substance at 25°C.

[0022] This invention provides an organosilicon release agent, which, by weight, is formulated from the following components: 100 parts of a polysiloxane composition, 0.5-5 parts of a hydrogen-containing crosslinking agent, 0.5-5 parts of a hydrosilylation catalyst, 0.5-5 parts of an anchoring agent, and 50-500 parts of an organic solvent; wherein the polysiloxane composition includes vinyl-containing long-chain polysiloxanes and vinyl-containing short-chain polysiloxanes, the mass ratio of the vinyl-containing long-chain polysiloxanes to the vinyl-containing short-chain polysiloxanes is (3-7):(3-7), the viscosity of the vinyl-containing short-chain polysiloxanes is 100-1000 mPa·s, and the viscosity of the vinyl-containing long-chain polysiloxanes is 150000-500000 mPa·s.

[0023] Compared with existing technologies, the silicone release agent provided by this invention uses a specific ratio of high-viscosity vinyl-containing long-chain polysiloxanes and low-viscosity vinyl-containing short-chain polysiloxanes as the main components. During the curing process of the release agent, these main components can undergo an addition reaction under the action of a hydrogen-containing crosslinking agent and a hydrosilylation catalyst. The vinyl-containing short-chain polysiloxanes have higher reactivity and can form a coating with a high crosslinking density with the hydrogen-containing crosslinking agent during the addition reaction, thus giving the release film made using this release agent better peel performance. Due to the high viscosity of the vinyl-containing long-chain polysiloxanes, the release film made using this release agent has better abrasion resistance and better adhesion. In summary, the release film made using the release agent provided by this invention simultaneously possesses better abrasion resistance, better adhesion, and better peel performance.

[0024] For example, in some embodiments of the present invention, the vinyl-containing short-chain polysiloxane is product 9106 manufactured by Dow Chemical Company; and the vinyl-containing long-chain polysiloxane is product G-300 manufactured by Hangzhou Sailikang New Material Technology Co., Ltd.

[0025] In some embodiments of the present invention, the organic solvent includes at least one of 120# gasoline, toluene, and methyl ethyl ketone.

[0026] like Figure 1As shown, this embodiment of the invention also provides a method for preparing a release film, comprising:

[0027] Step S1: Apply the silicone release agent as described above onto the substrate to obtain a wet release layer;

[0028] Step S2: Dry the wet release layer to form a release layer on the substrate, thereby obtaining a release film.

[0029] In some embodiments of the present invention, in step S2, the drying temperature is 90-200°C and the time is 50-150 seconds.

[0030] In some embodiments of the present invention, in step S1, the areal density of the wet release layer is 0.1-20 g / m³. 2 .

[0031] In some embodiments of the present invention, the thickness of the substrate is 20-150 μm.

[0032] In some embodiments of the present invention, the substrate is made of PET.

[0033] In some embodiments of the present invention, in step S2, the thickness of the release layer is 1-2 μm.

[0034] This invention also provides a release film, which is prepared using the above-described method for preparing release films.

[0035] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0036] Example 1

[0037] A1: By weight, 70 parts of vinyl-containing short-chain polysiloxane and 30 parts of vinyl-containing long-chain polysiloxane are mixed evenly to obtain a polysiloxane composition; wherein, the vinyl-containing short-chain polysiloxane is product 9106 manufactured by Dow Chemical Company, with a viscosity of 450 mPa·s, and the vinyl-containing long-chain polysiloxane is product G-300 manufactured by Hangzhou Sailikang New Material Technology Co., Ltd., with a viscosity of 150000 mPa·s;

[0038] A2: By weight, add 100 parts of toluene, 2 parts of anchoring agent (Dow, 9176), 3 parts of hydrogen-containing crosslinking agent, and 3 parts of hydrosilylation catalyst to the polysiloxane composition, and stir evenly to obtain an organosilicon release agent; wherein, the anchoring agent is product 9176 manufactured by Dow Chemical Company, the hydrogen-containing crosslinking agent is product 7028 manufactured by Dow Chemical Company, and the hydrosilylation catalyst is product 4000 manufactured by Dow Chemical Company;

[0039] A3: The silicone release agent is coated on a PET substrate to obtain a wet release layer; the wet release layer is dried to form a release layer on the PET substrate to obtain a release film; wherein the drying temperature is 160℃, the time is 60s, the thickness of the PET substrate is 80μm, and the thickness of the release layer is 1.5μm.

[0040] Example 2

[0041] The difference from Example 1 is that, in step A1, the polysiloxane composition is composed of 50 parts by weight of vinyl-containing short-chain polysiloxane and 50 parts by weight of vinyl-containing long-chain polysiloxane; the rest are the same as in Example 1.

[0042] Example 3

[0043] The difference from Example 1 is that, in step A1, the polysiloxane composition is composed of 30 parts by weight of vinyl-containing short-chain polysiloxane and 70 parts by weight of vinyl-containing long-chain polysiloxane; the rest are the same as in Example 1.

[0044] Comparative Example 1

[0045] The difference from Example 1 is that, in step A1, the polysiloxane composition is composed of 90 parts by weight of vinyl-containing short-chain polysiloxane and 100 parts by weight of vinyl-containing long-chain polysiloxane; the rest are the same as in Example 1.

[0046] Comparative Example 2

[0047] The difference from Example 1 is that, in step A1, the polysiloxane composition is composed of 10 parts by weight of vinyl-containing short-chain polysiloxane and 90 parts by weight of vinyl-containing long-chain polysiloxane; the rest are the same as in Example 1.

[0048] Comparative Example 3

[0049] The difference from Example 1 is that, A1: 70 parts by weight of vinyl-containing short-chain polysiloxane and 30 parts by weight of vinyl-containing long-chain polysiloxane are mixed evenly to obtain a polysiloxane composition; wherein, the vinyl-containing short-chain polysiloxane is product LX-500 manufactured by Hangzhou Sailikang New Material Technology Co., Ltd., with a viscosity of 1500 mPa·s, and the vinyl-containing long-chain polysiloxane is product G-300 manufactured by Hangzhou Sailikang New Material Technology Co., Ltd., with a viscosity of 150000 mPa·s.

[0050] Comparative Example 4

[0051] The difference from Example 1 is that, A1: by weight, 30 parts of vinyl-containing short-chain polysiloxane and 70 parts of vinyl-containing long-chain polysiloxane are mixed evenly to obtain a polysiloxane composition; wherein, the vinyl-containing short-chain polysiloxane is product 9106 manufactured by Dow Chemical Company with a viscosity of 450 mPa·s, and the vinyl-containing long-chain polysiloxane is product 7226 manufactured by Dow Chemical Company with a viscosity of 25000 mPa·s.

[0052] Experimental Example

[0053] The release films prepared in Examples 1-3 and Comparative Examples 1-4 were tested for release layer peel force, residual adhesion, abrasion resistance, and adhesion. The results are shown in Table 1. Table 1 shows that the release film prepared in Comparative Example 1 has poor adhesion and abrasion resistance. The release films prepared in Comparative Examples 2 and 3 have relatively high release force and residual adhesion. The release film prepared in Comparative Example 4 has poor adhesion and abrasion resistance. Therefore, compared with Comparative Examples 1-4, the release films prepared in Examples 1-3 simultaneously exhibit better abrasion resistance, better adhesion, and better peel performance.

[0054] Table 1

[0055]

[0056] Furthermore, it should be noted that although the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. An organosilicon release agent, characterized in that, The product, by weight, is composed of the following components: 100 parts of a polysiloxane composition, 0.5-5 parts of a hydrogen-containing crosslinking agent, 0.5-5 parts of a hydrosilylation catalyst, 0.5-5 parts of an anchoring agent, and 50-500 parts of an organic solvent; wherein the polysiloxane composition comprises vinyl-containing long-chain polysiloxanes and vinyl-containing short-chain polysiloxanes, the mass ratio of the vinyl-containing long-chain polysiloxane to the vinyl-containing short-chain polysiloxane is (3-7):(3-7), the viscosity of the vinyl-containing short-chain polysiloxane is 100-1000 mPa·s, and the viscosity of the vinyl-containing long-chain polysiloxane is 150000-500000 mPa·s; the vinyl-containing short-chain polysiloxane is product 9106 manufactured by Dow Chemical Company; and the vinyl-containing long-chain polysiloxane is product G-300 manufactured by Hangzhou Sailikang New Material Technology Co., Ltd.

2. The organosilicon release agent according to claim 1, characterized in that, The organic solvent includes at least one of 120# gasoline, toluene, and methyl ethyl ketone.

3. A method for preparing a release film, characterized in that, include: Step S1: Apply the silicone release agent as described in any one of claims 1-2 onto the substrate to obtain a wet release layer; Step S2: Dry the wet release layer to form a release layer on the substrate, thereby obtaining a release film.

4. The method for preparing the release film according to claim 3, characterized in that, In step S2, the drying temperature is 90-200℃ and the time is 50-150s.

5. The method for preparing the release film according to claim 3, characterized in that, In step S1, the areal density of the wet release layer is 0.1-20 g / m³. 2 .

6. The method for preparing the release film according to claim 3, characterized in that, The thickness of the substrate is 20-150 μm.

7. The method for preparing the release film according to claim 3, characterized in that, The substrate is made of PET.

8. The method for preparing the release film according to claim 3, characterized in that, In step S2, the thickness of the release layer is 1-2 μm.

9. A release film, characterized in that, The release film was prepared using the method described in any one of claims 3-8.

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