Acid-base discoloration OCA solvent preparation method and acid-base discoloration OCA hot melting preparation method

Abstract

The invention discloses an OCA (Optical Clear Adhesive) prepared by a preparation method of an acid-base discoloration OCA solvent and a hot melting preparation method of the acid-base discoloration OCA. The OCA can display different colors in an acidic or alkaline environment. When the OCA adhesive is attached to a product, if the OCA adhesive changes color, the environment is an acidic or alkaline environment, and the product is corroded and needs to be recycled and detected, so that defective products are prevented from flowing into a user market, the quality control strength of the product is improved, the use of an acid-base indicator is reduced, the detection procedures of workers are reduced, and the workload is reduced. The color changing effect of the acid-base color changing OCA solvent manufacturing method and the color changing effect of the acid-base color changing OCA hot melting manufacturing method are reversible and irreversible. The irreversible OCA can be used for the situation that whether the environmental pH value exceeds the standard and changes or not needs to be monitored, or marks or indications need to be changed according to the pH value change. If the reversible OCA adhesive is selected, the adhesive is suitable for medical treatment, for example, the pH value of body fluid or blood can be detected, the adhesive can be reused after being cleaned, and the cost is saved.

Description

Technical Field

[0001] The invention relates to the field of OCA glue, and in particular to a method for preparing an acid-base color-changing OCA solvent and a method for preparing an acid-base color-changing OCA hot-melt. Background Art

[0002] OCA is an optical adhesive with a light transmittance of up to 95%, so it is widely used in displays to ensure the display effect of the display.

[0003] At present, the OCA on the market is basically transparent and colorless, and a few with a one-piece black effect use smoked OCA. However, electronic products such as display screens are easily affected by acids and alkalis, which will affect product functions.

[0004] Therefore, some electronic products need to take measures to monitor whether the environmental pH exceeds the standard or changes. However, in warehouses or logistics, it is necessary to use acid-base indicators to mark items stored in specific environments for staff to identify, but the operation is cumbersome. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for preparing an acid-base color-changing OCA solvent and a method for preparing an acid-base color-changing OCA hot-melt.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] A method for preparing an acid-base color-changing OCA solvent, comprising:

[0008] Step S1: dissolving 50 parts by weight of OCA monomer in 30 parts by weight of organic solvent, adding 20 parts by weight of acid-base color-changing ink and 0.5 parts by weight of catalyst into the organic solvent, and stirring the mixture thoroughly;

[0009] Step S2: heating (temperature of 60° C.-120° C.) or cooling (temperature of 20° C.-30° C.) the mixture in step S1 to cause a polymerization reaction, so that the mixture precipitates a solid OCA glue that changes color with acid or alkali;

[0010] Step S3: filtering the organic solvent in step S2 to obtain solid OCA glue and the solvent after the reaction;

[0011] Step S4: Use pure water to rinse the surface of the solid OCA glue in step S3 and dry it.

[0012] In one embodiment, the catalyst is one of benzoyl peroxide, platinum catalyst and aminosilicon sulfur.

[0013] In one embodiment, the OCA monomer is a hot-melt resin and a silicone resin.

[0014] In one embodiment, the heating temperature in step S2 is 110 °C, and the cooling temperature is 20 °C.

[0015] In one embodiment, the cooling method adopted in step S2 is natural cooling or cold water bath.

[0016] In one embodiment, a light stabilizer or an antioxidant is further added in step S1.

[0017] An acid-base color-changing OCA hot melt manufacturing method includes:

[0018] Step S1: Sufficiently stir and mix 60 parts by weight of OCA monomer, 30 parts by weight of acid-base color-changing ink, 0.5 part by weight of catalyst, 0.5 part by weight of stabilizer, and 9% of pure water;

[0019] Step S2: Place the mixture in step S1 in a melting device for heating at a heating temperature of 150 °C - 300 °C to cause a polymerization reaction to form a solid OCA adhesive;

[0020] Step S3: Cool the solid OCA adhesive in step S2 to room temperature.

[0021] In one embodiment, it further includes step S4: Use a calender or a coater to uniformly coat the solid OCA adhesive in step S3 on a heavy release film, and attach a light release film above the coated solid OCA adhesive to form a storable OCA adhesive.

[0022] In one embodiment, it further includes step S5: Cut the OCA adhesive processed in step S4 to form monomer OCA adhesives of a certain size.

[0023] In one embodiment, the heating temperature in step S2 is 280 °C.

[0024] Compared with the prior art, the present invention has at least the following advantages:

[0025] 1. The acid-base color-changing OCA solvent manufacturing method and the acid-base color-changing OCA hot melt manufacturing method of the present invention produce an OCA adhesive that can show different colors in an acidic or alkaline environment. When the OCA adhesive is attached to a product, if the OCA adhesive changes color, it indicates that the environment is acidic or alkaline, and it also indicates that the product has been corroded and needs to be recycled and detected to prevent defective products from flowing into the user market, improve the product quality control, reduce the use of acid-base indicators, reduce the detection process of workers, and thus reduce the workload.

[0026] 2. The color-changing effects of the acid-base color-changing OCA solvent preparation method and the acid-base color-changing OCA hot-melt preparation method of the present invention are divided into reversible and irreversible. The irreversible OCA glue can be used in some situations where it is necessary to monitor whether the pH of the environment exceeds the standard and changes. Or it is necessary to change the mark or indication according to the change in pH. For example, in a warehouse or logistics, acid-base color-changing ink can be used to mark items stored in a specific environment. If a reversible OCA glue is selected, it is suitable for medical applications, such as detecting the pH of body fluids or blood, and can be reused after cleaning, saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below.

[0028] Figure 1 A schematic diagram of the steps of a method for preparing an acid-base color-changing OCA solvent in one embodiment of the present invention;

[0029] Figure 2 Schematic diagram of the steps of the hot-melt production method of acid-base color-changing OCA in one embodiment of the present invention. DETAILED DESCRIPTION

[0030] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings.

[0031] Embodiment 1:

[0032] A method for preparing an acid-base color-changing OCA solvent, please refer to Figure 1 ,include:

[0033] Step S1: dissolving 50 parts by weight of OCA monomer in 30 parts by weight of organic solvent, adding 20 parts by weight of acid-base color-changing ink and 0.5 parts by weight of catalyst into the organic solvent, and stirring the mixture thoroughly;

[0034] Step S2: heating (temperature of 60° C.-120° C.) or cooling (temperature of 20° C.-30° C.) the mixture in step S1 to cause a polymerization reaction, so that the mixture precipitates a solid OCA glue that changes color with acid or alkali;

[0035] Step S3: filtering the organic solvent in step S2 to obtain solid OCA glue and the solvent after the reaction;

[0036] Step S4: Use pure water to rinse the surface of the solid OCA glue in step S3 and dry it.

[0037] The OCA adhesive produced by the above manufacturing method can exhibit different colors in acidic or alkaline environments. When the OCA adhesive is attached to a product, if the OCA adhesive changes color, it indicates that the environment is acidic or alkaline, and it also indicates that the product has been corroded. Recycling and detection are required to prevent defective products from entering the user market, improve the quality control of the product, reduce the use of acid-base indicators, and reduce the detection process of workers, thereby reducing the workload.

[0038] Among them, the color-changing effects of the acid-base color-changing OCA solvent manufacturing method and the acid-base color-changing OCA hot-melt manufacturing method are divided into reversible and irreversible. The irreversible OCA adhesive can be used in some situations where it is necessary to monitor whether the environmental acidity or alkalinity exceeds the standard and changes. Or it is necessary to change the marking or indication according to the change of acidity or alkalinity. For example, in a warehouse or logistics, acid-base color-changing ink can be used to mark items stored in a specific environment. If a reversible OCA adhesive is selected, it is suitable for medical applications, such as detecting the acidity or alkalinity of body fluids or blood, and it can be used again after cleaning, saving costs.

[0039] In one embodiment, the catalyst is one of benzoyl peroxide, platinum catalyst, and amino silicon sulfide.

[0040] In one embodiment, the OCA monomer is a hot-melt resin and a silicone resin.

[0041] In one embodiment, the heating temperature in step S2 is 110°C, and the cooling temperature is 20°C.

[0042] In one embodiment, the cooling method used in step S2 is natural cooling or cold water bath. The cooling process of natural cooling or cold water bath is easy to control and has low cost.

[0043] In one embodiment, a light stabilizer or an antioxidant is further added in step S1. The light stabilizer or antioxidant acts synergistically through different mechanisms to improve the weather resistance and aging resistance of the OCA optical adhesive, ensuring the reliability and stability of the product in different environments.

[0044] Embodiment 2:

[0045] Please refer to Figure 2 , this application also proposes an acid-base color-changing OCA hot-melt manufacturing method. The effects of the OCA adhesives produced in Embodiment 1 and this embodiment are the same. Specifically, it includes:

[0046] Step S1: Thoroughly stir and mix 60 parts by weight of OCA monomer, 30 parts by weight of acid-base color-changing ink, 0.5 part by weight of catalyst, 0.5 part by weight of stabilizer, and 9% of pure water;

[0047] Step S2: Heat the mixture in Step S1 in a melting device at a heating temperature of 150°C - 300°C to cause a polymerization reaction to form a solid OCA adhesive.

[0048] Step S3: Cool the solid OCA adhesive in Step S2 to room temperature.

[0049] In one embodiment, it further includes Step S4: Use a calender or coater to uniformly coat the solid OCA adhesive in Step S3 on a heavy release film. The heavy release film is used to support the OCA adhesive and improve the overall hardness. Attach a light release film above the coated solid OCA adhesive to form a storable OCA adhesive.

[0050] In one embodiment, it further includes Step S5: Cut the OCA adhesive processed in Step S4 to form monomer OCA adhesives of a certain size for easy attachment and use on different display screens.

[0051] In one embodiment, the heating temperature in Step S2 is 280°C.

[0052] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A method for preparing an acid-base color-changing OCA solvent, characterized in that: include: Step S1: dissolving 50 parts by weight of OCA monomer in 30 parts by weight of organic solvent, adding 20 parts by weight of acid-base color-changing ink and 0.5 parts by weight of catalyst into the organic solvent, and stirring the mixture thoroughly; Step S2: heating (temperature of 60° C.-120° C.) or cooling (temperature of 20° C.-30° C.) the mixture in step S1 to cause a polymerization reaction, so that the mixture precipitates a solid OCA glue that changes color with acid or alkali; Step S3: filtering the organic solvent in step S2 to obtain solid OCA glue and the solvent after the reaction; Step S4: Use pure water to rinse the surface of the solid OCA glue in step S3 and dry it.

2. The method for preparing the acid-base color-changing OCA solvent according to claim 1, characterized in that: The catalyst is one of benzoyl peroxide, platinum catalyst and aminosilicon sulfur.

3. The method for preparing the acid-base color-changing OCA solvent according to claim 1, characterized in that: The OCA monomers are hot-melt resin and silicone resin.

4. The method for preparing the acid-base color-changing OCA solvent according to claim 1, characterized in that: The heating temperature in step S2 is 110°C, and the cooling temperature is 20°C.

5. The method for preparing the acid-base color-changing OCA solvent according to claim 1, characterized in that: The cooling method adopted in step S2 is natural cooling or a cold water bath.

6. The method for preparing the acid-base color-changing OCA solvent according to claim 1, characterized in that: In the step S1, a light stabilizer or an antioxidant is also added.

7. A method for hot-melt production of acid-base color-changing OCA, characterized in that: include: Step S1: 60 parts by weight of OCA monomer, 30 parts by weight of acid-base color-changing ink, 0.5 parts by weight of catalyst, 0.5 parts by weight of stabilizer and 9% of pure water are fully stirred and mixed; Step S2: placing the mixture in step S1 in a melting device and heating it at a temperature of 150° C. to 300° C. to cause a polymerization reaction to form a solid OCA glue; Step S3: Cooling the solid OCA glue in step S2 to room temperature.

8. The hot-melt production method of acid-base color-changing OCA according to claim 7, characterized in that: The method further comprises step S4: using a calender or a coater to uniformly coat the solid OCA glue in step S3 on the heavy release film, and attaching a light release film on the coated solid OCA glue to form a storable OCA glue.

9. The hot-melt production method of acid-base color-changing OCA according to claim 8, characterized in that: The method further comprises step S5: cutting the OCA glue processed in step S4 to form monomeric OCA glue of a certain size.

10. The hot-melt production method of acid-base color-changing OCA according to claim 7, characterized in that: The heating temperature in step S2 is 280°C.

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