A kind of blackboard and preparation method thereof

A technology of blackboard and konjac fine powder, which is applied in the field of teaching blackboard preparation, can solve the problems of high VOC content of paint, paint falling, hidden dangers, etc., and achieve the effects of not easy cracking and paint falling, reducing VOC content, and improving film-forming properties

Active Publication Date: 2020-07-03
FUZHOU COLLEGE OF FOREIGN STUDIES & TRADE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing paints are mainly solvent-based, which need to solve the problems of high VOC content, serious pollution and fire hazards; the existing water-based paint products have very high VOC, and water-soluble acrylic resin amino baking varnish is generally used. The VOC is as high as 300g / L and the odor It is also very large; and with the increase of use time, it is prone to paint peeling and cracking, which makes it difficult to wipe the blackboard clean

Method used

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  • A kind of blackboard and preparation method thereof

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preparation example Construction

[0043] The present invention also provides the preparation method of above-mentioned blackboard, comprises the following steps:

[0044] Step 1: Add 8-12 parts by weight of purified konjac powder into 25-30 parts by weight of deionized water, then heat it in a water bath to 45°C while stirring, keep it warm for 2-4 hours, and then stir it at a water bath temperature of 45°C While adding 0.2~0.4 parts by weight of potassium persulfate, 1~3 parts by weight of starch, 0.1~0.2 parts by weight of glycerin and 0.5~2.5 parts by weight of chitosan, stir until all are dissolved to obtain konjac gel liquid, wherein, after purification Konjac fine powder refers to the particle size of 0.125~0.425mm konjac fine powder with more than 80% of the particles;

[0045] Step 2: Cool the konjac gel liquid obtained in step 1 to below 30°C, then add 10-15 parts by weight of pigments and fillers, 1-3 parts by weight of dispersant, 25-35 parts by weight of water-based acrylic resin and 5 parts by wei...

Embodiment 1

[0053] A method for preparing a blackboard, comprising the steps of:

[0054] Step 1: Add 8g of purified konjac powder into 25g of deionized water, then heat it in a water bath to 45°C while stirring, and keep it warm for 2h, then add 0.2g potassium persulfate, 1g Starch, 0.1g glycerol and 0.5g chitosan, stir until all dissolving, obtain konjac gel liquid, wherein, the konjac fine powder after purification refers to that the granularity of 0.125mm konjac fine powder is more than 80%;

[0055] Step 2: Cool the konjac gel liquid obtained in step 1 to below 30°C, then add 10g of pigment and filler, 0.5g of polyethylene glycol with a molecular weight of 30-200, 1g of dispersant (dodecylsulfuric acid) while stirring Sodium), 25g of water-based acrylic resin, 5g of water-based amino resin (full methyl etherified amino resin Cytec 303) and 2g of water-based anti-graffiti resin (TEGO Protect 5100), a mixture;

[0056] Step 3: Add 1g of graphite powder, 3g of nano-titanium dioxide, 3g...

Embodiment 2

[0060] A method for preparing a blackboard, comprising the steps of:

[0061] Step 1: Add 12g of purified konjac powder into 30g of deionized water, then heat it in a water bath to 45°C while stirring, and keep it warm for 4h, then add 0.4g of potassium persulfate, 3g of potassium persulfate and 3g of Starch, 0.2g glycerin and 2.5g chitosan, stir until all dissolving, obtain konjac gel liquid, wherein, the konjac fine powder after purification refers to that particle size is that the particle of 0.425mm konjac fine powder is more than 80%;

[0062] Step 2: Cool the konjac gel obtained in step 1 to below 30°C, then add 15g of pigments and fillers, 2.5g of polyethylene glycol with a molecular weight of 30-200, 3g of a dispersant (dodecylsulfuric acid) while stirring. Sodium), 35g of water-based acrylic resin, 7g of water-based amino resin (full methyl etherified amino resin Taiwan Changchun MR603) and 4g of water-based anti-graffiti resin (TEGO Protect 5100), a mixture;

[0063...

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Abstract

The invention provides a blackboard and a preparation method thereof. The blackboard comprises a substrate and a blackboard film coating the surface of the substrate. The blackboard film is prepared from 25-35 parts by weight of water-based acrylic resin, 25 to 30 parts by weight of deionized water, 5 to 7 parts by weight of aqueous amino resin, 10 to 15 parts by weight of a pigment filler, 1 to 2parts by weight of graphite powder, 3 to 5 parts by weight of nano titanium dioxide, 3 to 5 parts by weight of talcum powder, 1 to 3 parts by weight of a dispersing agent, 1 to 3 parts by weight of starch, 0.5 to 2.5 parts by weight of chitosan, 0.5 to 1.5 parts by weight of a leveling agent, 1 to 2 parts by weight of a wetting agent, 0.5 to 1.5 parts by weight of an adhesion promoter, 0.2 to 0.4parts by weight of a defoaming agent, 0.2 to 0.4 parts by weight of potassium persulfate, 0.1 to 0.2 parts by weight of glycerin, and 8 to 12 parts by weight of purified konjac fine powder. The purified konjac fine powder contains 80% or more particles with sizes of 0.125 to 0.425mm. The blackboard is safe and environmentally friendly and is not easily cracked.

Description

technical field [0001] The invention relates to the technical field of teaching blackboard preparation, in particular to a blackboard and a preparation method thereof. Background technique [0002] Blackboard plays an important role in people's learning and life, especially closely related to children's learning and growth process. The use of blackboard paint is also related to the health of users. Most of the existing blackboard paints on the market are solvent systems, which will release harmful solvents that affect human health during construction and use, and have short service life and other shortcomings. [0003] At present, blackboard paints on the market are basically oil-based products. Water-based blackboard paints are more environmentally friendly than traditional solvent-based blackboard paints. Water-based paints can be applied by blending with water. The indispensable diluents and curing agents in paints contain a lot of toxic ingredients, and the environmenta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D133/04C09D161/20C09D7/65C09D7/61C09D7/63C09D7/43B43L1/10
CPCB43L1/10C08K2003/2241C08K2201/011C08L2205/02C08L2205/035C09D133/04C08L61/20C08L5/08C08L3/02C08L5/02C08K13/02C08K3/04C08K3/22C08K3/34C08K5/053
Inventor 卢允照张正阳陈恭鹏郑栋梁庄宗伟
Owner FUZHOU COLLEGE OF FOREIGN STUDIES & TRADE
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