Effect of sodium chloride on dyeing

 

PVA 1799 (PVA BF17)

As an electrolyte, sodium hydroxide can promote the dyeing of cotton with reactive turquoise blue. It can change the dyeing speed and dyeing rate, with a small amount of addition and a low utilization rate of dye. With a large amount of addition, it can shorten the dyeing time, but it is not easy to dye evenly, thoroughly and easily produce color flowers. Reactive turquoise blue is less sensitive to electrolytes (compared with other reactive dyes). When the content of sodium hydroxide in the dye solution is less than 30g / L, the dyeing promotion is more obvious, the content increases, and the dyeing promotion effect is weak. When the local content of sodium hydroxide reaches 250G / L, the dye will agglomerate and salting out. In actual operation, the method of pre adding sodium hydroxide and soda ash (or bicarbonate soda) can be used, that is to say, first 1-5g / L of sodium hydroxide and 0.5g-1g/l of sodium carbonate are added into the auxiliary cylinder to fully dissolve and then put into the main cylinder. After ten minutes of operation, the dye is added. This method can improve the dye uptake of reactive turquoise blue (a small amount of alkali agent will improve the conversion of Hydroxyl Anion on cellulose) and the utilization of the dye.

 

When dyeing dark turquoise blue, if you need to add more sodium hydroxide or sodium hydroxide, pay special attention to the phenomenon of agglomeration and salting out when the content is too high.

 

Effect of soda on dyeing

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Reactive dyes react with cellulose fibers in alkaline condition, that is, fixation reaction. In factory production, sodium carbonate can be added in several times according to the color depth, so that the pH value of the dye solution rises slowly. When the pH value is greater than 10, reactive turquoise blue is very sensitive, and attention should be paid at all times during dyeing operation.

 

When soda ash is added, it should also be added in several times: add 10% for the first time, use the refluxing dye solution to compare the dilution with the big bath, use a certain amount of clear water for the second and the third time, first beat it into pulp, then dilute it with hot water (60-80 ℃), and then beat it from the auxiliary cylinder to the main cylinder. The amount of soda added should be determined according to the amount of dye. If the dye is too low, the dyeing is not thorough, the amount of added is too large, and the reaction is too fast, although the amount of dye is increased to a certain extent, But it is easy to produce color flower, color difference and dye agglomeration. At the same time, the hydrolysis of dye is also accelerated. It is not easy to use the pre alkali method in the color matching of turquoise blue and light yellow, because the light yellow is sensitive to alkali, fast dye and easy to appear the problem of color and flower.

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According to the survey, Chinese mainland has a large number of magnesium resources, and its total reserves rank first in the world. Magnesium oxide is widely used in electric cable, rubber products, medicine, adhesives, metallurgy, ceramics and other industries. With the industrial development and upgrading and the need and development of new high-tech functional material market, a variety of innovative and refined magnesium oxide products have been developed, mainly used for high-grade lubricating oil, high-grade tanning alkali extraction grade, medical and pharmaceutical industry, food grade. Nearly 10 kinds of composition, such as silicon steel grade, high-grade electromagnetic grade and high-purity magnesium oxide.

 

PVA 1799 (PVA BF17)

Although Magnesium Oxide is an auxiliary material, its application and influence in different industries are very great. Influence in the electric cable industry: the influence of vulcanization accelerator, coke inhibitor, filler, acid absorbent, fire and flame retardant, heat resistance, corrosion resistance and wear resistance; the influence in the adhesive industry: the influence of vulcanization accelerator, coke inhibitor and acid absorbent, accelerating reaction in the resin reaction liquid. Therefore, it can be seen that many products add magnesium oxide, which is just like that you need to put monosodium glutamate in the daily cooking, without adding taste, and put a little of this dish will be beautiful in color, fragrance and taste.

 

In recent years, with the development of technology, new functional materials have become a hot topic of scientific research, and the quality level of raw materials of new functional materials has become a yardstick of the development of new functional materials. At present, it mainly develops the application in the new functional materials of luminescence, electronic optics, electronic and other industries. The new functional materials mentioned above have very strict regulations on the purity of raw materials.

 

PVA 1788 (PVA BP17)

Although there are no general standards and specifications in the world at this stage, except for reference to the application regulations of new functional materials, the chemical material standard will be used as the reference standard. Taking high-purity electronic grade basic magnesium carbonate and magnesium oxide as examples, they are mainly used for aerospace electronic components, military electronic components, communication equipment, radar, etc., so the technical specifications of high-purity electronic grade basic magnesium carbonate and magnesium oxide are determined.

 

One of the main uses of MgO is as a fire retardant. The traditional fire-proof materials widely choose the combination of halogen-containing polymer or halogen-containing fire-proof agent. In case of fire accident, there will be too much smoke and toxic and harmful corrosive gas due to combustion and thermal decomposition, which will corrode instruments and equipment, thus preventing fire fighting and crowd evacuation. According to data statistics, 80% of the above casualties in fire accidents are caused by smoke and harmful gases caused by materials. Therefore, in addition to the efficiency of fire protection, low smoke becomes a standard that fire retardant cannot lack.

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1、 Price trend

 

According to the price monitoring of the business society, the average price of the factory quotation of the mainstream manufacturers on June 12th was 18333.33 yuan / ton, which was lower than the price of 18500 yuan / ton at the beginning of the week, with a drop of 0.9% within the week and 2.65% compared with the beginning of the month. 36.42% lower than the same period last year

 

PVA 1788 (PVA BP17)

2、 Market analysis

 

This week, R134a price in refrigerant market fell slightly, which has fallen to the new low of this year, and the trading center fell. Slow unlocking of foreign economy, poor market situation of car market, few new export orders, fair domestic demand, but insufficient release, tepid trading. The price of hydrofluoric acid at the raw material end has been raised, and the cost end has some support. However, in the near future, the number of enterprises has increased, and there are plenty of goods in the yard. The inventory of the goods holders is on the high side, so the price reduction is looking for good. According to the price monitoring of the business agency, as of June 12, the average price of refrigerant R134a was 18333.33 yuan / ton, and the market price was concentrated around 17000 yuan / ton – 21000 yuan / ton.

PVA 1799 (PVA BF17)

 

Upstream, the mainstream price of domestic anhydrous hydrofluoric acid manufacturers this week is 8000-9000 yuan / ton, and the factory price of on-site merchants is temporarily stable. The domestic hydrofluoric acid manufacturers have a general operating rate, and the on-site supply of goods is normal, driven by the rising price of fluorite. However, the demand of downstream refrigerant industry is poor, and on-site procurement is the main thing. It is expected that the on-site price will continue to rise slightly in the later period.

 

3、 Future forecast

 

According to the refrigerant analysts of the business club, the newly added capacity is excessive in the near future, and the supply and demand pattern has not improved. It is expected that the refrigerant R134a market will decline slightly in the short term.

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Adipic acid market trend chart

 

PVA 1799 (PVA BF17)

According to the data of the business club’s bulk list, this week (6.8-12), there is no big domestic adipic acid market, and the price is basically the same as last week. According to the data monitored by the business club, the rise and fall of adipic acid in East China is 0, the market demand is still weak, and the supply is relatively abundant. The prices of some dealers keep rising and falling within 100 yuan. Most manufacturers are still short of the future market and light of inventory operation. According to the business club Currently, the quotation range of adipic acid market is 6600-6900 yuan / ton.

 

In terms of market supply, the operating rate of adipic acid manufacturers is still high this week. At present, more than 80% of adipic acid manufacturers have sufficient supply of goods in the market, and the inventory pressure of manufacturers remains high. The dealers usually take the goods as the main part, and the centralized purchase behavior is not in the off-season market. Some dealers purchase according to the order, and light inventory operation is the main part. In general, the enterprise inventory and market inventory pressure are relatively heavy. In terms of cost, from the beginning of May to the present, pure benzene has rebounded sharply, boosted by the recovery of crude oil and other peripheral cost factors. Moreover, since June, pure benzene is still rising. According to the monitoring of business society, pure benzene has increased by 4.17% (as shown in the figure below), but it has not brought fundamental benefits to adipic acid. On the one hand, the delay of cost transmission, and more importantly, the downstream demand There is no fundamental change in demand, which offsets the benefits brought by the cost. Moreover, adipic acid is squeezed from the upstream and downstream ends, and corporate profits gradually decline.

 

Trend chart of pure benzene Market

 

PVA 1788 (PVA BP17)

From the perspective of terminal demand, downstream demand is still relatively weak, and it is still in the off-season level. In addition, affected by the epidemic this year, the sales of polyurethane and other thermal insulation materials are also lower than that of the same period last year. In addition, downstream products such as PA66 have not come out of the dilemma, and the price is still at a low level. As a result, the demand for adipic acid is difficult to fundamentally improve, the inventory is difficult to digest, the manufacturers press more inventory, and dealers generally follow the market and purchase on demand. In addition, in addition to the weak domestic demand, the external demand has also worsened, especially affected by the overseas epidemic, the external demand has decreased, and the pressure on adipic acid export has continued to increase, which does not rule out the possibility that the inventory will continue to rise in the later period.

 

In the later stage, it seems to the business community that at present, due to the continuous upward impact of crude oil, petrochemical products have rebounded, especially pure benzene. The downstream adipic acid is not moved, but the burden of the enterprise is increased due to the increase of upstream cost. The root cause is still the sluggish demand, especially the overseas epidemic situation has not been effectively controlled, foreign orders have shrunk sharply, and adipic acid export has been hit. At present, adipic acid is in a dilemma both at home and abroad. Considering comprehensively, adipic acid will still shake and adjust at the bottom in the near future.

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In addition to itself, calcium chloride usually includes calcium chloride dihydrate and anhydrous calcium chloride. According to the shape, it can be divided into solid and liquid. Generally, it is solid. According to the shape, it can be divided into powder, flake and particle.

 

PVA 1788 (PVA BP17)

Solid calcium chloride:

 

1. According to its shape, it can be divided into:

 

(1) Granular calcium chloride

 

(2) Flaky calcium chloride

 

(3) Powdered calcium chloride

 

(4) Spherical calcium chloride

 

2. According to the content of crystal water, it can be divided into:

 

(1) Calcium chloride dihydrate:

 

a. Calcium chloride dihydrate in tablet form, content ≥ 74%

 

b. Calcium chloride dihydrate granular, content ≥ 74%

 

c. Calcium chloride dihydrate powder, content ≥ 74%

 

d. Calcium chloride dihydrate block, content ≥ 74%

 

(2) Anhydrous calcium chloride:

 

a. Anhydrous calcium chloride tablet, content ≥ 94%

 

b. Anhydrous calcium chloride granular, content ≥ 94%

 

c. Anhydrous calcium chloride powder, content ≥ 94%

 

PVA 1799 (PVA BF17)

3. It can be divided into:

 

(1) Industrial grade calcium chloride

 

(2) Food grade calcium chloride

 

Different customers have different choices because of different uses. For example, flake is generally used for making cryogen, antifreeze, automobile antifreeze, fire extinguishing agent, coagulant and other purposes, while powder and granular are commonly used for water treatment, snow melting agent and other purposes.

 

Because slice is cheap, the market supply is large. Granular price is more expensive, but liquidity is good. There is no difference in the content of the same kind of products, but because the customers’ adding process is different from the products they react to in the production process, they should choose products with different characteristics.

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