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Environment-friendly nitro pencil head lacquer and preparation method thereof

A nitro and pencil technology, applied in the field of nitro lacquer, can solve the problems of high and low viscosity of nitro lacquer, high viscosity of finished products, non-compliance, etc., and achieve the effects of alleviating work intensity, improving production environment, and improving product quality

Inactive Publication Date: 2017-12-15
浙江安益新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing products are prone to color floating and blooming during use, and the adhesion is weak. The product contains high lead and VOC (total organic volatile compounds), which does not conform to the current development concept of green environmental protection.
[0004] Our company has the following problems in the original one-step preparation process of environmentally friendly nitro varnish for pencils: 1. The viscosity of the nitrocellulose solution cannot be strictly controlled, and it is easy to cause the viscosity of the nitro varnish produced to be high and sometimes low, resulting in The product quality is unstable; 2. The lead content and VOC content of nitro lacquer are easy to get out of control and exceed the standard, and cannot meet the requirements of the EU standard; 3. Due to the high viscosity of the finished product, it is difficult to filter, resulting in difficulty in filtering and packaging the finished product, resulting in large losses

Method used

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  • Environment-friendly nitro pencil head lacquer and preparation method thereof

Examples

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Effect test

preparation example Construction

[0066] Preparation of tallow oil modified alkyd resin

[0067] Put 250 kg of tallow tree oil and 100 kg of glycerin into the reactor, raise the temperature to 120°C, add 1.5 kg of lithium hydroxide under stirring, then raise the temperature to 220°C, stir for 1 hour, add 200 kg of phthalic anhydride, 100 kg of butyl acetate kg, 50 kg of acetone. Reflux for 3 hours, then lower to 25°C for later use.

[0068] The technical indicators achieved are as follows:

[0069] Appearance: clear and transparent, without mechanical impurities;

[0070] Acid value: ≤15 mg LiOH / g;

[0071] Color: ≤10 (iron-cobalt method);

[0072]Viscosity: 8-10 seconds (25°C);

[0073] Solid content: 60±2%;

[0074] Fineness: ≤10 microns.

preparation Embodiment 1

[0076] This preparation method comprises the steps:

[0077] (1) Take 10 kg of the prepared tallow tree oil modified alkyd resin, 1 kg of vinyl acetate, 0.5 kg of methyl acrylate, mix, stir slowly until completely dissolved, then add 15 kg of nitro colorant, 2 kg of acrylic resin 1 kg of citric acid monoglycerides (respectively 0.5 kg of monoester and 0.5 kg of diester), disperse at high speed in a high-speed mixer for 30 minutes, transfer to a grinder and grind for 30 minutes, and use a scraper fineness meter to detect the fineness of the color paste When the density reaches ≤10μm, add it to the paint mixing tank and set aside.

[0078] (2) Dissolve 60 kg of nitrocellulose and 3 kg of ethyl acetate in a dissolving tank. After adjusting the viscosity, add it to the paint mixing tank in step (1), mix it with the mixture in the paint mixing tank, discharge the slurry, and adjust the color , detection, canning.

preparation Embodiment 2

[0080] This preparation method comprises the steps:

[0081] (1) Take 20 kg of the prepared tallow tree oil modified alkyd resin, 1 kg of vinyl acetate, 2 kg of n-butyl methacrylate, mix, stir slowly until completely dissolved, then add 20 kg of nitro colorant, acrylic acid 5 kg of resin, 4.5 kg of mono- and di-glycerides of citric acid (respectively 3 kg of mono-ester and 1.5 kg of di-ester), disperse in a high-speed mixer for 60 minutes at high speed, transfer to a grinder and grind for 60 minutes, and use a scraper fineness meter to detect The fineness of the color paste reaches ≤10μm, and it is added into the paint mixing tank.

[0082] (2) Dissolve 70 kg of nitrocellulose, 3 kg of butyl acetate, and 4 kg of cyclohexanone in a dissolving tank. After adjusting the viscosity, add it to the paint mixing tank in step (1) and mix it with the mixture in the paint mixing tank , pulping, toning, testing, canning.

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Abstract

The invention discloses environment-friendly nitro pencil head lacquer and a preparation method thereof. The nitro lacquer is prepared from the following components in parts by weight: 60-70 parts of nitro-cotton, 10-20 parts of nitro paste, 10-20 parts of Chinese tallow modified alkyd resin, 1-5 parts of acrylic resin, 1-5 parts of citric acid mono / diglyceride, a solvent accounting for 10-15% of the mass usage amount of the Chinese tallow modified alkyd resin, and an assistant accounting for 5-15% of the mass usage amount of the nitro-cotton. Compared with the prior art, the environment-friendly nitro pencil head lacquer disclosed by the invention has the advantages that the large-scale production of the high-quality nitro pencil head lacquer is realized, the working strength is relieved, the production environment is improved, the product quality is improved, technical performance indexes reach or exceed quality requirements of similar products in the foreign market, the standards of European Union and America are met, the usage of an aromatic diluent is avoided, the film curing speed is improved, and the production cost and pollution of an organic solvent on the environment can be reduced.

Description

technical field [0001] The invention relates to a nitro varnish, in particular to an environment-friendly pencil top varnish and a preparation method thereof. Background technique [0002] As an important writing and drawing tool in daily study and life, pencil is beautiful or not directly determines the sales volume of pencil. In order to improve the aesthetics of pencils, pencil paint is generally applied on the outer surface of pencils, so as to satisfy consumers' pursuit of pencils in aesthetics. [0003] Nitro paint is widely used in the field of pencil coating due to its unique properties such as easy construction, fast drying of the coating film, soft luster, good hand feeling, and good outdoor weather resistance. The main film-forming substance of nitro lacquer is nitrocellulose, which is composed of alkyd resin, modified rosin resin, acrylic resin, amino resin and other resins and plasticizers. Solvents mainly include true solvents such as esters, ketones, and alc...

Claims

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Application Information

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IPC IPC(8): C09D101/18C09D167/08C09D133/00C09D7/12C09D7/00C08G63/48C08G63/83
CPCC09D101/18C08G63/48C08G63/83C08L2205/03C08L67/08C08L33/00C08K5/103
Inventor 刘丽君刘安益裴文
Owner 浙江安益新材料有限公司
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