CN100386393C - A kind of powder and its preparation method - Google Patents

Abstract

A kind of calcined powder, its raw material components and its content include in parts by weight: 2-methoxynaphthalene 29-85, calcium stearate 1-5, sodium lauryl sulfate 2-6; Add camphor, stearic acid and other auxiliary agents; after the above-mentioned raw material ratio is prepared, a protective film is covered on the surface. In addition to the excellent performance of the fadeable scribing powder, the scribing powder produced by the present invention has a smooth appearance, which can effectively prevent the sublimation of the raw materials in the scribing powder when the scribing powder is not in use, prevent the scribing powder from drying and hardening, and protect the scribing powder. The use performance of the powder is odorless after the user touches it, and the impact of the powder smell on the environment is reduced; the invention has simple process, easy-to-obtain raw materials, and low cost.

Description

A kind of powder and its preparation method

technical field

The invention relates to a scribing powder used in the field of garment processing, more specifically to a scribing powder with a protective film that is environmentally friendly, fragrant, insect-proof, heat-sensitive, and capable of sublimation and fading.

Background technique

At present, ordinary scribing powder and invisible scribing powder are often used in the field of clothing production. The ordinary scribing powder cannot be removed by itself, which brings inconvenience to garment processing; although the invisible scribing powder can disappear by itself within a certain period of time, it is not easy to fade off easily. , and contains salicylic acid and other toxic substances, long-term use is not good for the health of users. In order to solve the above-mentioned problems, our research group once applied for a patent to propose a kind of fadeable chalk, which is characterized in that its components and their contents include: 2-methoxynaphthalene 29-85, calcium stearate 1-5, sodium lauryl sulfate 2-6; other additives such as camphor and stearic acid can also be added. The chalk is non-toxic, can fade immediately when exposed to heat, can also fade by sublimation, has fragrance, and can repel insects. However, due to the substance that is easy to sublimate, the product will become dry and hard due to the sublimation of the raw materials when placed for a long time, and the surface will be rough, making the chalk difficult to color and affecting the performance of the product; users will have the smell of chalk on their hands after touching it, and the product will be sublimated. And the smell emitted will also affect the environment.

Contents of the invention

The object of the present invention is to provide an environment-friendly chalk powder and its preparation method which can effectively prevent the sublimation of raw materials, prevent drying and hardening, and prevent the hands of the contactor from being contaminated with odor.

A kind of calcined powder provided by the present invention, its raw material components and its content include in parts by weight: 2-methoxynaphthalene 29-85, calcium stearate 1-5, sodium lauryl sulfate 2- 6. Other additives such as camphor and stearic acid can also be added. It is characterized in that after the above-mentioned raw material ratio is prepared, a protective film is covered on the surface.

A kind of preparation method of chalk powder provided by the invention is characterized in that comprising the following steps:

(1) In terms of weight percentage, mix 1.0-3.5% of film-forming agent, 0.1-2.0% of spreading agent, 0.1-0.8% of thickener and water, and heat and stir at 85-95°C to make it Completely dissolve to form a uniform colorless transparent solution or milky white solution (film-forming solution), stop heating, and keep the solution warm at 20-35°C;

(2) Soak the prepared chalk in the above solution, take it out after 15 to 60 minutes, and dry it in the air at room temperature to obtain the chalk with a protective film.

Wherein, the film-forming agent is polyvinyl alcohol, which can be various types of polyvinyl alcohol, such as PVA 124 or PVA 1788 or PVA 1799 or PVA 1899 or PVA 0588. They protect the chalk from the external environment by forming a film on the chalk surface.

The spreading agent may be sodium stearate, sodium lauryl sulfate or sodium lauryl sulfate and the like. The spreading agent mainly plays the role of spreading, reducing the surface tension of the film-forming liquid, helping PVA to quickly spread and form a film on the chalked surface, and at the same time, it can also play a role of dispersing and speed up the homogenization of the film-forming liquid.

Described thickener such as sodium carboxymethyl cellulose (Na-CMC) etc., main function is to increase the viscosity of film-forming liquid, strengthens the adhesive force of film-forming liquid on the chalk surface.

Compared with the prior art, the present invention has the characteristics and effects: in addition to the excellent performance of the fadeable chalk, the chalk produced by the present invention has a smooth appearance, and can effectively prevent the sublimation of raw materials in the chalk when the chalk is not in use. It prevents the chalk from drying and hardening, protects the use performance of the chalk, makes the hands of the user tasteless after touching, and reduces the impact of the chalk smell on the environment; the invention has a simple process, easy-to-obtain raw materials, and consumes very little, so the cost is not high .

Detailed ways

Example 1:

In terms of weight percentage, PVA124 1.5%, sodium lauryl sulfate 1.0%, sodium carboxymethyl cellulose 0.3%, and water as the balance, mix them at room temperature, and heat and stir at a constant temperature of 90-95°C Dissolve it completely until it becomes a uniform colorless and transparent solution. After cooling to room temperature (about 22°C), soak the chalk in the solution, take it out after about 30 minutes, and dry it in the air at room temperature.

Example 2:

In terms of weight percentage, mix 1.5% PVA1788, 1.5% sodium dodecylsulfonate, 0.3% sodium carboxymethyl cellulose, and water at room temperature, and heat and stir at a constant temperature of 90-95°C Dissolve it completely until it becomes a uniform colorless and transparent solution. After cooling to 25°C, soak the chalk in the solution, take it out after about 30 minutes, and dry it in the air at room temperature.

Example 3:

In terms of weight percentage, mix PVA0588 2.0%, sodium stearate 0.5%, sodium carboxymethylcellulose 0.2%, and water at room temperature, and heat and stir at a constant temperature of 90-95°C to make it completely Dissolve until it becomes a uniform milky white transparent solution. After cooling to 30°C, soak the chalk powder in the solution, take it out after about 30 minutes, and dry it in the air at room temperature.

Comparing the coated chalk and uncoated chalk in the examples, it is found that the former is still smooth and uniform in appearance, and hardly smells the smell emitted by the product, while the latter is rough in appearance and has a strong smell due to the sublimation of raw materials; After placing it for two months, it was found that the former was darker and smoother than the latter.

Claims (5)

1. tailor's chalk, its feed composition and content thereof are counted by weight and are comprised: 2-methoxynaphthalene 29-85, calcium stearate 1-5, sodium lauryl sulphate 2-6; After it is characterized in that making, cover layer protecting film on its surface by the above-mentioned raw materials proportioning.

2. the preparation method of a kind of tailor's chalk as claimed in claim 1 is characterized in that comprising the steps:

(1) by weight percentage, with membrane-forming agent 1.0～3.5%, spreading agent 0.1～2.0%, thickening material 0.1～0.8%, the water of surplus mixes, and heated and stirred is dissolved it fully under 85～95 ℃ of constant temperatures, becomes even colourless transparent solution or milky white solution, stop heating, solution is incubated under 20～35 ℃ of conditions;

(2) Manufactured tailor's chalk is soaked in above-mentioned solution, takes out after 15～60 minutes, in air, dry under the normal temperature, have a tailor's chalk of protective membrane.

3. as the preparation method of tailor's chalk as described in the claim 2, it is characterized in that described membrane-forming agent is a polyvinyl alcohol.

4. as the preparation method of tailor's chalk as described in the claim 2, it is characterized in that described spreading agent is sodium stearate, sodium lauryl sulphate or sodium laurylsulfonate.

5. as the preparation method of tailor's chalk as described in the claim 2, it is characterized in that described thickening material is an Xylo-Mucine.