CN113563793B

CN113563793B - Photocureable coating for teaching blackboard

Info

Publication number: CN113563793B
Application number: CN202110539503.6A
Authority: CN
Inventors: 刘泽江
Original assignee: UC Nano Technologies Inc
Current assignee: UC Nano Technologies Inc
Priority date: 2018-09-30
Filing date: 2018-09-30
Publication date: 2022-09-23
Anticipated expiration: 2038-09-30
Also published as: CN109280479A; CN109280479B; CN113563793A

Abstract

The invention discloses a photocureable coating for a teaching blackboard, which consists of the following components in percentage by weight: aliphatic polyurethane triacrylate, 1,6 hexanediol diacrylate, ethylene glycol diglycidyl ether, alkyl modified organosiloxanes, hydroxytoluene butyl ester, organic thermosetting polymethylurea resin, 4-acryloylmorpholine, 2-hydroxy-2-methyl-1-phenyl-1-propanone, sulfonyloxy ketones, Pigment BK7 and castor oil polyglycidyl ether. The photocureable coating for the teaching blackboard effectively avoids the oxygen inhibition phenomenon of the photocureable coating, has high printing precision, and has high curing hardness, strong adhesive force to a substrate and scratch resistance.

Description

Photocureable coating for teaching blackboard

Technical Field

The invention relates to the field of blackboards, in particular to a photocureable coating for a teaching blackboard.

Background

The existing blackboard generally goes through several stages such as cement blackboard, wooden blackboard, ground glass blackboard, metal blackboard, etc. The UV curing technology has the advantages of high curing speed, high production efficiency, good mechanical and physical properties, little pollution, energy conservation and the like, and is praised as a green technology. With the increasing attention of human beings on environmental protection and the development of science and technology, the UV curing market develops rapidly and is widely applied to the fields of coatings, adhesives, printing ink, electronic packaging, glass, dental restoration, photoetching imaging, biomedicine and the like. Despite the progress of UV curing technology, there still exist some problems in application, such as severe oxygen inhibition, low curing hardness, high viscosity and poor stability in the existing UV curing system.

Oxygen inhibition refers to a phenomenon in which radicals are consumed in the presence of oxygen in a radical photopolymerization system, and the polymerization reaction is affected. When a photopolymerization system is cured in air, oxygen in the air can cause the photocuring surface to be incompletely cured and sticky, so that the overall performance of the photocuring material is seriously influenced, and particularly, the problems of influence on adhesive force, hardness and the like caused by large volume shrinkage after curing are solved.

Disclosure of Invention

The photocureable coating for the teaching blackboard provided by the invention can be cured without too much heat energy, the phenomenon of oxygen inhibition of the photocureable coating is effectively avoided, the printing precision is high, the surface tension of the photocureable coating for the teaching blackboard is small, and the adhesion to a base material is strong.

In order to achieve the purpose, the invention adopts the technical scheme that: the photocureable coating for the teaching blackboard comprises the following components in parts by weight: 40 parts of aliphatic polyurethane triacrylate, 40 parts of 1,6 hexanediol diacrylate, 14 parts of ethylene glycol diglycidyl ether, 1.2 parts of 4-acryloyl morpholine, 0.4 part of alkyl modified organosiloxane, 0.8 part of hydroxytoluene butyl ester, 4 parts of organic thermosetting polymethyl urea resin, 4 parts of sulfonyloxy ketone, 8 parts of 2-hydroxy-2-methyl-1-phenyl-1-acetone, 6 parts of Pigment BK7 and 18 parts of castor oil polyglycidyl ether.

The technical scheme of further improvement in the technical scheme is as follows:

1. in the scheme, the particle size of the organic thermosetting polymethyl urea resin is 5-7 mu m.

2. In the scheme, the viscosity of the photocureable coating is 20-25 cp.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages and effects:

1. the invention relates to a light-cured coating for a teaching blackboard, wherein alkyl modified organosiloxane and castor oil polyglycidyl ether are added into a system to synergistically modify the light-cured coating containing aliphatic polyurethane triacrylate, 1,6 hexanediol diacrylate and ethylene glycol diglycidyl ether, so that the components are uniformly dispersed and have good compatibility; and 2-hydroxy-2-methyl-1-phenyl-1-acetone and sulfonyloxy ketone are matched, so that the crosslinking rate of each component in the photocureable coating is improved, the photocureable coating can be cured without too much heat energy, the oxygen inhibition phenomenon of the photocureable coating is effectively avoided, the printing precision is high, and the product yield is improved.

2. According to the photocureable coating for the teaching blackboard, the hydroxytoluene butyl ester and the organic thermosetting polymethyl urea resin are added into the system, so that the curing hardness of the photocureable coating is improved, and the photocureable coating is more resistant to scraping; and under the condition of not influencing the viscosity and the curing performance of the system, the surface tension of the photocureable coating containing the Pigment BK7 and the adhesive force to the base material are further improved, the process is simple, and the cost is saved.

Detailed Description

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the illustrated orientations or positional relationships, and are only used for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The invention is further described below with reference to the following examples:

example (b): the photocureable coating for the teaching blackboard comprises the following components in parts by weight: 40 parts of aliphatic polyurethane triacrylate, 40 parts of 1,6 hexanediol diacrylate, 14 parts of ethylene glycol diglycidyl ether, 1.2 parts of 4-acryloyl morpholine, 0.4 part of alkyl modified organosiloxane, 0.8 part of hydroxytoluene butyl ester, 4 parts of organic thermosetting polymethyl urea resin, 4 parts of sulfonyloxy ketone, 8 parts of 2-hydroxy-2-methyl-1-phenyl-1-acetone, 6 parts of Pigment BK7 and 18 parts of castor oil polyglycidyl ether.

The particle size of the organic thermosetting polymethyl urea resin is 5-7 mu m;

the viscosity of the photocureable coating is 20-25 cp;

a preparation method of the photocureable coating for the teaching blackboard comprises the following steps:

(1) putting aliphatic polyurethane triacrylate, 1,6 hexanediol diacrylate, ethylene glycol diglycidyl ether, castor oil polyglycidyl ether and alkyl modified organosiloxane into a stirring dispersion machine, and mixing at a stirring speed of 400-600 r/min for 10-15 min to obtain a material 1;

(2) adding hydroxytoluene butyl ester, organic thermosetting polymethyl urea resin, 4-acryloyl morpholine, 2-hydroxy-2-methyl-1-phenyl-1-acetone, sulfonyloxy ketone and Pigment BK7 into the material 1 obtained in the step (1), and continuously mixing for 10-15 min at a stirring speed of 500-600 r/min to obtain a material 2;

(3) and (3) grinding the material 2 obtained in the step (2) to a particle size of 300-400 nm to obtain the photocureable coating for the teaching blackboard.

Comparative examples 1 to 3: the photocureable coating for the teaching blackboard consists of the following components in parts by weight, and is shown in table 2:

TABLE 1

Components	Comparative example 1	Comparative example 2	Comparative example 3
				Aliphatic polyurethane triacrylate	32 portions of	26 portions of	38 portions of
1,6 hexanediol diacrylate	41 portions of	48 portions of	36 portions of
				Ethylene glycol diglycidyl ether	10 portions of	13 portions of	11 portions of
4-acryloyl morpholine	0.8 part of	1.0 part of	1.2 parts of
				Alkyl modified organosiloxane	-	0.3 part	0.4 part of
Hydroxytoluene butyl ester	0.5 part of	0.7 portion of	-
				Organic thermosetting polymethyl urea resin	3 portions of	2 portions of	-
Sulfonyloxy ketones	3 portions of	-	5 portions of
				2-hydroxy-2-methyl-1-phenyl-1-propanone	7 portions of	-	9 portions of
Pigment BK7	8 portions of	9 portions of	6 portions of
				Castor oil polyglycidyl ether	-	12 portions of	18 portions of

The indexes of the tests of the present example and the comparative example are shown in Table 2:

TABLE 2

Test items	Examples	Comparative example 1	Comparative example 2	Comparative example 3
					Hardness of	3H	2H	2H	1H
Viscosity of the oil	23	29	27	26
					Adhesion force	4B	3B	3B	2B
Material shrinkage (%)	1.02	0.90	1.10	0.89
					Open time(s)	12s	20s	22s	19s

；

As can be seen from Table 2, the photocurable coating for teaching blackboards has low viscosity, strong adhesion and short curing time. The alkyl modified organic siloxane and the castor oil polyglycidyl ether are added into the light-cured coating for the teaching blackboard to synergistically modify the light-cured coating for the teaching blackboard containing the aliphatic polyurethane triacrylate, the 1,6 hexanediol diacrylate and the ethylene glycol diglycidyl ether, so that the components are uniformly dispersed and have good compatibility; 2-hydroxy-2-methyl-1-phenyl-1-acetone and sulfonyloxy ketone are matched, so that the crosslinking rate of each component in the photocureable coating is improved, the photocureable coating for the teaching blackboard can be cured without too much heat energy, the oxygen inhibition phenomenon of the photocureable coating is effectively avoided, the printing precision is high, and the product yield is improved; secondly, the hydroxyl toluene butyl ester and the organic thermosetting polymethyl urea resin are added into the system, so that the curing hardness of the photocureable coating is improved, and the photocureable coating for the teaching blackboard is more scratch-resistant; and under the condition of not influencing the viscosity and the curing performance of the system, the surface tension of the photocureable coating containing Pigment BK7 and the adhesive force to the base material are further improved, the process is simple, and the cost is saved.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. The light-cured coating for the teaching blackboard is characterized in that: the photocureable coating consists of the following components in parts by weight:

40 parts of aliphatic polyurethane triacrylate, 40 parts of 1,6 hexanediol diacrylate, 14 parts of ethylene glycol diglycidyl ether, 1.2 parts of 4-acryloyl morpholine, 0.4 part of alkyl modified organosiloxane, 0.8 part of hydroxytoluene butyl ester, 4 parts of organic thermosetting polymethyl urea resin, 4 parts of sulfonyloxy ketone, 8 parts of 2-hydroxy-2-methyl-1-phenyl-1-acetone, 6 parts of Pigment BK7 and 18 parts of castor oil polyglycidyl ether; the viscosity of the photocureable coating is 20-25 cp.

2. The photocurable coating for teaching blackboards according to claim 1, wherein: the organic thermosetting polymethyl group

The particle size of the urea resin is 5 to 7 μm.