CN104788574A - Preparation method of low-ash nitro-cotton for paint - Google Patents
Preparation method of low-ash nitro-cotton for paint Download PDFInfo
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- CN104788574A CN104788574A CN201510190678.5A CN201510190678A CN104788574A CN 104788574 A CN104788574 A CN 104788574A CN 201510190678 A CN201510190678 A CN 201510190678A CN 104788574 A CN104788574 A CN 104788574A
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- cotton
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- low ash
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Abstract
The invention relates to a preparation method of low-ash nitro-cotton for a paint. The preparation method comprises the following steps: (1) preprocessing; (2) performing nitrification; (3) performing washing in a boiling manner; (4) performing washing in a cooling manner; (5) performing dewatering; (6) performing alcoholization; (7) performing water driving. Compared with traditional production of the nitro-cotton for the paint in the technology, for the low-ash nitro-cotton for the paint prepared by the preparation method, which is provided by the invention, the ash content can reach 0.02%, the nitrogen content is uniform, the stickiness is suitable, the technical defect that the ash content of most nitro-cotton in the market is too high is overcome, and the low-ash nitro-cotton has better stability and high safety, so that the domestic blank of the technology in China is filled.
Description
Technical field
The invention belongs to nitro-cotton and manufacture field, especially a kind of preparation method of low ash content coating nitro-cotton.
Background technology
Along with the development of science and technology, the range of application of nitro-cotton is no longer confined on war products, but is embodied in the every aspect of daily life, the aspects such as such as metal sprays paint, woodwork coating, stencil paper, ink.In order to make the paint film effect of obtained product more attractive in appearance and durable, user has new requirement for the ash oontent of coating nitro-cotton product, the ash oontent of most of coating nitro-cotton only can reach about 0.2% in the market, paint film property can be made more to optimize if can reduce further.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art part, a kind of preparation method of low ash content coating nitro-cotton is provided.
The object of the present invention is achieved like this:
A preparation method for low ash content coating nitro-cotton, the steps include:
(1) pre-treatment: the purified cotton after opener is put into clear water carries out swelling immersion, stirring and drying is for subsequent use;
(2) nitrated: the purified cotton of swelling is carried out nitration reaction with acid in nitrator;
(3) boil and wash: the centrifugal employing of the nitro-cotton after the acid steam under pressure that drives is carried out boiling washing;
(4) cold wash: carry out cold wash by boiling the nitro-cotton after washing, rinses to can't smell tart flavour with clear water;
(5) dewater: the nitro-cotton after cold wash is sent in whizzer and dewaters;
(6) refine: the nitro-cotton after dehydration is delivered in alcoholization machine, carries out stirring, refining;
(7) expelling water: the nitro-cotton after alcoholization is carried out smart wine displacement expelling water, obtain nitro-cotton finished product after expelling water, packaging.
And, described step (2) in acid be nitric acid and sulfuric acid mixing, volume ratio is about 1:3, nitration reaction time 30min.
And, described step (3) in steam under pressure boil and wash temperature between 120 DEG C-140 DEG C, time 1-2h.
And, described step (7) in expelling water refine for first adding Diluted Alcohol, and then add neutral spirits alcoholization.
And, described step (7) in the expelling water time be 8min.
Advantage of the present invention and positively effect are:
Compared with low ash content coating nitro-cotton provided by the invention is produced with traditional coating nitro-cotton in technique, the present invention obtains nitro-cotton ash oontent can reach 0.02%, and the even modest viscosity of nitrogen content, overcome the technology prejudice that most of nitro-cotton ash oontent in industry are higher, there is good stability, security is high, has filled up the blank of domestic technique.
Embodiment
Describe embodiments of the invention in detail below; It should be noted that, the present embodiment is narrative, is not determinate, can not limit protection scope of the present invention with this.
A preparation method for low viscous coating nitro-cotton, the steps include:
(1) pre-treatment: the purified cotton after opener is put into clear water and carry out swelling immersion, stir 1h dry for standby;
(2) nitrated: the purified cotton of swelling to be about the nitric acid of 1:3 by volume ratio in nitrator and sulfuric acid mixing acid carries out nitrated, nitration mixture flow 8 ㎡/h, nitration mixture temperature 30 DEG C of-40 DEG C of nitration reaction 30min;
(3) boil and wash: drive the nitro-cotton after acid adopt steam under pressure 120 DEG C-140 DEG C to carry out boiling and wash 1-2h by centrifugal;
(4) cold wash: carry out cold wash, cold wash time 20-30min by boiling the nitro-cotton after washing, rinses to can't smell tart flavour;
(5) dewater: the nitro-cotton after cold wash is sent in whizzer and dewaters, dewatering time 5min;
(6) refine: the nitro-cotton after dehydration is delivered in alcoholization machine, carries out stirring, refining;
(7) expelling water: the nitro-cotton after alcoholization is carried out smart wine displacement expelling water, expelling water time 8min, first adds Diluted Alcohol and carry out expelling water, and then add neutral spirits expelling water during expelling water.Nitro-cotton finished product is obtained, packaging after expelling water.
Obtain nitro-cotton product index: nitrogen content 11.7%, transmittance 90%, whiteness 86%, ash content 0.02%, wetting agent content 30%, acidity 0.04%.
Claims (5)
1. a preparation method for low ash content coating nitro-cotton, is characterized in that: the steps include:
(1) pre-treatment: the purified cotton after opener is put into clear water carries out swelling immersion, stirring and drying is for subsequent use;
(2) nitrated: the purified cotton of swelling is carried out nitration reaction with acid in nitrator;
(3) boil and wash: the centrifugal employing of the nitro-cotton after the acid steam under pressure that drives is carried out boiling washing;
(4) cold wash: carry out cold wash by boiling the nitro-cotton after washing, rinses to can't smell tart flavour with clear water;
(5) dewater: the nitro-cotton after cold wash is sent in whizzer and dewaters;
(6) refine: the nitro-cotton after dehydration is delivered in alcoholization machine, carries out stirring, refining;
(7) expelling water: the nitro-cotton after alcoholization is carried out smart wine displacement expelling water, obtain nitro-cotton finished product after expelling water, packaging.
2. the preparation method of low ash content coating nitro-cotton according to claim 1, is characterized in that: described step (2) in acid be nitric acid and sulfuric acid mixing, volume ratio is about 1:3, nitration reaction time 30min.
3. the preparation method of low ash content coating nitro-cotton according to claim 1, is characterized in that: described step (3) in steam under pressure boil and wash temperature between 120 DEG C-140 DEG C, time 1-2h.
4. the preparation method of low ash content coating nitro-cotton according to claim 1, is characterized in that: described step (7) in expelling water refine for first adding Diluted Alcohol, and then add neutral spirits alcoholization.
5. the preparation method of low ash content coating nitro-cotton according to claim 1, is characterized in that: described step (7) in the expelling water time be 8min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510190678.5A CN104788574A (en) | 2015-04-21 | 2015-04-21 | Preparation method of low-ash nitro-cotton for paint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510190678.5A CN104788574A (en) | 2015-04-21 | 2015-04-21 | Preparation method of low-ash nitro-cotton for paint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104788574A true CN104788574A (en) | 2015-07-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510190678.5A Pending CN104788574A (en) | 2015-04-21 | 2015-04-21 | Preparation method of low-ash nitro-cotton for paint |
Country Status (1)
| Country | Link |
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| CN (1) | CN104788574A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111763265A (en) * | 2020-07-14 | 2020-10-13 | 北京理工大学 | Method for refining nitration bamboo cellulose crude product |
| CN112500501A (en) * | 2020-11-25 | 2021-03-16 | 北方化学工业股份有限公司 | Method for removing water from low-moisture nitrocotton |
-
2015
- 2015-04-21 CN CN201510190678.5A patent/CN104788574A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111763265A (en) * | 2020-07-14 | 2020-10-13 | 北京理工大学 | Method for refining nitration bamboo cellulose crude product |
| CN112500501A (en) * | 2020-11-25 | 2021-03-16 | 北方化学工业股份有限公司 | Method for removing water from low-moisture nitrocotton |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150722 |