Preparation method of special organic silicon resin for photocuring hand feeling coating

Abstract

The invention belongs to the technical field of photocuring hand feeling coatings, and discloses a preparation method of special organic silicon resin for a photocuring hand feeling coating, and the preparation method comprises the following steps: preparing raw materials including a silane monomer, an organic functional monomer, a solvent, a photoinitiator and a catalyst, the silane monomer is methyl triethoxysilane, the organic functional monomer is vinyl silane, and the solvent is a solvent; the photocuring functional group, the flexible group and the photoinitiator are arranged, the functional group has photocuring performance, the solvent is ethyl alcohol and acetone and is used for adjusting the viscosity of the resin, the photoinitiator is nitride and is used for promoting the photocuring reaction of the resin, and the photocuring functional group, the flexible group and the photoinitiator are arranged, and the functional group comprises acrylic ester and metacrylic acid ester. A functional group containing double bonds is introduced in the synthesis process, so that a cross-linking reaction can occur under ultraviolet irradiation, the resin is cured, the flexibility of the resin can be enhanced by a flexible group, and the coating has better soft touch feeling, so that the coating can be rapidly cured under the ultraviolet irradiation.

Description

Technical Field

[0001] The invention belongs to the technical field of photocurable hand-feel coatings, and in particular relates to a method for preparing a special organic silicone resin for photocurable hand-feel coatings. Background Art

[0002] The excellent properties of silicone resins have been widely recognized. With the change of the formula of synthetic resin raw materials, many silicone resins with special properties can be synthesized, some of which are resistant to high and low temperatures, some are strong and hard, some are strong and tough, some are radiation-resistant, and some are highly insulating. Although the properties of silicone resins vary, as a resin for coatings, its coating curing method is relatively simple, usually using solvent-based high-temperature thermal curing.

[0003] However, the existing method for preparing a special silicone resin for photocurable hand-feel coating is not perfect and still has certain defects: the curing effect of the silicone resin during preparation is relatively weak, and the soft touch of the resin needs to be improved, the silicon oxygen chain structure in the silicone resin needs to be strengthened, the surface hydrophilicity and weather resistance of the resin are reduced, and the coating in the coating cannot be cured quickly. Summary of the invention

[0004] The object of the present invention is to provide a method for preparing a special silicone resin for light-curing hand-feel coatings, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical scheme: a kind of organic silicone resin specially used for photocurable hand-feel coating, including raw material preparation, the raw materials include silane monomer, organic functional monomer, solvent, photoinitiator and catalyst, the silane monomer is methyltriethoxysilane, the organic functional monomer is vinyl silane, and has functional groups with photocuring performance.

[0006] Preferably, the solvent is ethanol and acetone, which are used to adjust the viscosity of the resin, and the photoinitiator is a nitride, which is used to promote the photocuring reaction of the resin.

[0007] Preferably, the catalyst is divided into an acid catalyst and a base catalyst, which helps the condensation reaction to proceed, reacts the silane monomer with water to generate silanol and ethanol, and the hydrolysis reaction is carried out in the solvent ethanol to ensure the uniformity of the reaction. The silanol generated by hydrolysis further undergoes a condensation reaction to form a silicon-oxygen bond, thereby generating a skeleton structure of the silicone resin.

[0008] Preferably, the functional group reacts with the hydrolyzed silicone resin to form a silicone resin having a photocurable functional group, and a functional group having a photocurable property is added to the silicone resin molecule, and the functional group includes acrylates and methacrylates.

[0009] Preferably, the copolymerization reaction is carried out in an anhydrous solvent, the reaction temperature is controlled between 80-120°C, and flexible groups are added to the resin to improve the flexibility and softness of the resin and improve the feel. The molecular weight of the resin is adjusted by controlling the reaction time and temperature. A lower molecular weight usually makes the coating softer.

[0010] Preferably, the flexible group includes an organic ether group and a fluorinated group, the reaction temperature is between 50°C and 70°C, the reaction time is less than 6 hours, the hydrolysis and polycondensation reactions proceed at a shallower pace, and the generated silicone resin has a shorter molecular chain and a lower molecular weight.

[0011] Preferably, a proper amount of solvent is added to adjust the viscosity of the coating, and a photoinitiator is added to ensure that the resin can be quickly cured under ultraviolet light. The solvent includes toluene, and the amount of the photoinitiator added is 1%-5% of the total amount of the resin.

[0012] A method for preparing a special silicone resin for light-cured hand-feel coating comprises the following steps:

[0013] Step 1: Raw material preparation: prepare silane monomer, organic functional monomer, solvent, catalyst and photoinitiator;

[0014] Step 2: Hydrolysis and polycondensation reaction: Silane monomer reacts with water to form silanol, which then forms silicone resin through polycondensation reaction;

[0015] Step 3: Introducing photocurable functional groups: copolymerizing photocurable monomers with silicone resins;

[0016] Step 4: Optimize the feel by adding flexible groups and controlling molecular weight;

[0017] Step 5: Prepare the photocurable coating: mix the resin with the solvent and the photoinitiator to prepare the photocurable coating;

[0018] Step 6: Light-curing: Apply the coating to the substrate and cure it with UV light;

[0019] Step 7: Test coating performance and make adjustments as needed.

[0020] The beneficial effects of the present invention are as follows:

[0021] The present invention sets photocurable functional groups, flexible groups and photoinitiators, wherein the functional groups include acrylates and methacrylates. In the synthesis process, functional groups containing double bonds are introduced, so that a cross-linking reaction can occur under ultraviolet light irradiation to cure the resin. The flexible groups can enhance the flexibility of the resin, improve the hand feel, and make the coating have a better soft touch. A higher silane content usually increases the hardness and high temperature resistance of the resin. The ratio of silane to organic monomer is 1:1, which can enhance the silicon oxygen chain structure of the resin and increase the surface hydrophilicity and weather resistance of the resin. Photoinitiators are essential components in photocurable coatings. They decompose and generate free radicals under ultraviolet light irradiation, thereby initiating a photocuring reaction in the resin. It is ensured that there are sufficient photoinitiators and photocurable functional groups in the coating to ensure that the coating can be rapidly cured under ultraviolet light irradiation. After the coating is applied to the surface of the substrate and irradiated with ultraviolet light, the photocurable resin in the coating is rapidly cured through a photoinitiated reaction to form a hard and durable coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a preparation flow chart of the present invention. DETAILED DESCRIPTION

[0023] 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.

[0024] like Figure 1 The embodiment of the present invention provides a technical solution for a method for preparing a special organic silicone resin for a light-curable hand-feel coating:

[0025] See also Figure 1 , a special silicone resin for photocurable hand-feel coating, including raw material preparation, the raw materials include silane monomer, organic functional monomer, solvent, photoinitiator and catalyst, the silane monomer is methyltriethoxysilane, the organic functional monomer is vinyl silane, and has a functional group with photocuring performance.

[0026] Among them, the solvent is ethanol and acetone, which are used to adjust the viscosity of the resin. The photoinitiator is a nitride, which is used to promote the photocuring reaction of the resin. The catalyst is divided into an acid catalyst and a base catalyst to help the condensation reaction. The silane monomer reacts with water to generate silanol and ethanol. The hydrolysis reaction is carried out in the solvent ethanol to ensure the uniformity of the reaction. The silanol generated by hydrolysis further undergoes a condensation reaction to form a silicon-oxygen bond to produce the skeleton structure of the silicone resin. The functional group reacts with the hydrolyzed silicone resin to form a silicone resin with a photocuring functional group. Functional groups with photocuring properties are added to the silicone resin molecules, and the functional groups include acrylates and methacrylates.

[0027] During use, the copolymerization reaction is carried out in an anhydrous solvent, the reaction temperature is controlled between 80-120°C, and flexible groups are added to the resin to improve the flexibility and softness of the resin and improve the feel. The molecular weight of the resin is adjusted by controlling the reaction time and temperature. A lower molecular weight usually makes the coating softer. The flexible groups include organic ether groups and fluorinated groups. The reaction temperature is between 50°C and 70°C, the reaction time is less than 6 hours, the hydrolysis and polycondensation reactions proceed shallowly, and the resulting silicone resin molecular chain is shorter and has a lower molecular weight. An appropriate amount of solvent is added to adjust the viscosity of the coating, and a photoinitiator is added to ensure that the resin can be quickly cured under ultraviolet light. The solvent includes toluene, and the amount of photoinitiator added is 1%-5% of the total resin.

[0028] A method for preparing a special silicone resin for light-cured hand-feel coating comprises the following steps:

[0029] Step 1: Raw material preparation: prepare silane monomer, organic functional monomer, solvent, catalyst and photoinitiator;

[0030] Step 2: Hydrolysis and polycondensation reaction: Silane monomer reacts with water to form silanol, which then forms silicone resin through polycondensation reaction;

[0031] Step 3: Introducing photocurable functional groups: copolymerizing photocurable monomers with silicone resins;

[0032] Step 4: Optimize the feel by adding flexible groups and controlling molecular weight;

[0033] Step 5: Prepare the photocurable coating: mix the resin with the solvent and the photoinitiator to prepare the photocurable coating;

[0034] Step 6: Light-curing: Apply the coating to the substrate and cure it with UV light;

[0035] Step 7: Test coating performance and make adjustments as needed.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A silicone resin for light-curable hand-feel coating, characterized in that: The method comprises raw material preparation, wherein the raw materials include silane monomer, organic functional monomer, solvent, photoinitiator and catalyst, the silane monomer is methyltriethoxysilane, the organic functional monomer is vinyl silane, and the functional group has photocuring performance.

2. The organic silicone resin for light-curable hand-feel coating according to claim 1, characterized in that: The solvent is ethanol and acetone, which are used to adjust the viscosity of the resin. The photoinitiator is nitride, which is used to promote the photocuring reaction of the resin.

3. The organic silicone resin for light-curable hand-feel coating according to claim 2, characterized in that: The catalyst is divided into an acid catalyst and a base catalyst, which helps the condensation reaction to proceed, reacts the silane monomer with water to generate silanol and ethanol, and the hydrolysis reaction is carried out in the solvent ethanol to ensure the uniformity of the reaction. The silanol generated by hydrolysis further undergoes a condensation reaction to form a silicon-oxygen bond to produce the skeleton structure of the silicone resin.

4. The organic silicone resin for light-curable hand-feel coating according to claim 3, characterized in that: The functional groups react with the hydrolyzed organic silicone resin to form an organic silicone resin with photocurable functional groups. Functional groups with photocurable properties are added to the organic silicone resin molecules, and the functional groups include acrylates and methacrylates.

5. The organic silicone resin for light-curable hand-feel coating according to claim 4, characterized in that: The copolymerization reaction is carried out in an anhydrous solvent, and the reaction temperature is controlled between 80-120° C. Flexible groups are added to the resin to improve the flexibility and softness of the resin and improve the hand feel. The molecular weight of the resin is adjusted by controlling the reaction time and temperature. A lower molecular weight usually makes the coating softer.

6. The organic silicone resin for light-curable hand-feel coating according to claim 1, characterized in that: The flexible group includes an organic ether group and a fluorinated group, the reaction temperature is between 50° C. and 70° C., the reaction time is less than 6 hours, the hydrolysis and polycondensation reactions proceed shallowly, and the generated silicone resin molecular chain is shorter and has a lower molecular weight.

7. The organic silicone resin for light-curable hand-feel coating according to claim 1, characterized in that: An appropriate amount of solvent is added to adjust the viscosity of the coating, and a photoinitiator is added to ensure that the resin can be quickly cured under ultraviolet light. The solvent includes toluene, and the amount of photoinitiator added is 1%-5% of the total amount of the resin.

8. A method for preparing a special silicone resin for light-curing hand-feel coating, the method being applicable to the special silicone resin for light-curing hand-feel coating as claimed in claims 1 to 7, characterized in that : Includes the following steps: Step 1: Raw material preparation: prepare silane monomer, organic functional monomer, solvent, catalyst and photoinitiator; Step 2: Hydrolysis and polycondensation reaction: Silane monomer reacts with water to form silanol, which then forms silicone resin through polycondensation reaction; Step 3: Introducing photocurable functional groups: copolymerizing photocurable monomers with silicone resins; Step 4: Optimize the feel by adding flexible groups and controlling molecular weight; Step 5: Prepare the photocurable coating: mix the resin with the solvent and the photoinitiator to prepare the photocurable coating; Step 6: Light-curing: Apply the coating to the substrate and cure it with UV light; Step 7: Test coating performance and make adjustments as needed.

Images