CN1416947A - Active deoxidizing desiccant and its prepn - Google Patents

Abstract

The active deoxidizing desiccant includes SiO2 10-90 wt%, CaO 1-20 wt%, Fe 1-60 wt%, K2O 1-5 wt%, Fe2O3 1-5 wt%, MgO 1-10 wt%, and Al2O3 1-20 wt%. Its preparation process includes refining natural mineral and mixing in the said proportion via stirring. The present invented desiccant has both absorption of moisture and deoxidation functions and is a safe, hygienic and non-toxic environment protecting product.

Description

Active deoxidizing and drying agent and preparation method thereof

Technical Field

The invention relates to a drying agent and a preparation method thereof, in particular to an active deoxidation drying agent and a preparation method thereof.

Background

Many varieties of drying agents appear on the market at present, mainly including: some silica gel, molecular sieve, quicklime, clay and the like pass through physical adsorption, and some depend on chemical reaction, wherein the bagged silica gel particles are taken as the main material, the water absorption performance of the silica gel is lower, and the moisture absorption rate is as follows: at a temperature of 25 ℃ and a Relative Humidity (RH) of 20%, the relative humidity is only 8%; at a temperature of 25 ℃ and an RH of 50%,only 20%; at a temperature of 25 ℃ and an RH of 90%, only 30%; in addition, they can only absorb the water in the sealed gas, but it can not play a good role in the maintenance of precise instruments, the preservation of food, the preservation of Chinese patent medicine, etc. depending on the moisture absorption alone, and it is necessary to remove the oxygen in the preservation space to meet the requirements of preservation and oxidation resistance, and the current desiccant can not meet the above requirements.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an active deoxidizing and drying agent with double effects of moisture absorption and deoxidation and a preparation method thereof.

The purpose of the invention can be realized by the following technical scheme:

an active deoxidizing and drying agent comprises the following formula (weight percentage, the same below):

SiO₂10～90％

CaO 1～20％

Fe 1～60％

K₂O 1～5％

Fe₂O₃1～5％

MgO 1～10％

Al₂O₃1～20％

the preparation method of the active deoxidizing and drying agent comprises the following process steps: firstly, refining mined natural active minerals, then mixing the natural active minerals according to the proportion, and uniformly stirring the mixture to obtain the product.

Compared with the prior art, the active deoxidizing and drying agent is prepared by adopting natural minerals and refining through a special process, is not formed by chemistry, is safe and sanitary to use, is a nontoxic and harmless environment-friendly product, and has high moisture absorption capacity; and because the natural mineral does not contain acidity, the natural mineral cannot pollute the environment when discarded after being used, can keep dry without deformation when water absorption moisture reaches saturation, can reduce the oxygen concentration to a basically oxygen-free state (namely, can reduce the oxygen concentration from 21 percent to below 0.1 percent) after one or two days in a closed space, and has the effects of killing insects, killing mites, preventing mildew, preventing rust, preventing aging and the like.

The mechanism of action of the invention is of two kinds: physical and chemical effects ofSiO 2₂Mainly due to physical effects, CaO and Al₂O₃The moisture is absorbed by the chemical reaction principle, the moisture absorption process is irrelevant to the external moisture, and the absorbed moisture cannot return to the dried object due to re-volatilization; the deoxidizing component is mainly active iron powder, it can absorb oxygen in the package and maintain it in an oxygen-free state for a period of time to prevent oxidation of the food or other ingredients, thereby prolonging its shelf life.

The invention has wide application field and relates to a plurality of industries, such as:

1. oil and grain and oil products; tobacco, tea, dried vegetable, dried fruit, delicacy, dried fish, dried meat slice, cured product, pickles, etc.;

2. cotton, wool, silk, hemp raw materials and products;

3. wood, leather, rubber, etc.;

4. chinese and western medicinal materials, patent medicine, medical equipment and the like;

5. chemical raw materials and medical intermediates;

6. instruments, electronic components, electromechanical devices, and the like;

7. photographic and optical equipment;

8. historical archives, cultural relics, antiques, artworks and the like;

9. weapons, ordnance, etc.;

10. fuel engines, safes, generators, batteries, etc.;

11. rare noble metals.

Detailed Description

The invention can design reasonable specifications of the deoxidizing desiccant according to the specific use condition of the deoxidizing desiccant, and fully play the role of each component.

Example 1

Type 100 desiccant formulation:

SiO₂50％

CaO 10％

Fe 20％

K₂O 3％

Fe₂O₃2％

MgO 5％

Al₂O₃10％

the preparation method of the 100 type desiccant comprises the following steps:

firstly, refining the mined natural active minerals, then mixingthe natural active minerals according to the proportion, and uniformly stirring the mixture to obtain a desiccant product; the product is separately packed in a packaging bag made of paper and plastic composite materials meeting certain air permeability requirements, and can be used.

Taking 5g of 100 type active deoxidizing and drying agent as an example, the oxygen absorption and moisture absorption capacity is as follows (T is 25 ℃, RH is 80%): can absorb 100ml of oxygen and 2g of moisture.

Example 2

Formulation of type 200 desiccant:

SiO₂30％

CaO 6％

Fe 40％

K₂O 4％

Fe₂O₃2％

MgO 6％

Al₂O₃12％

the preparation of type 200 desiccant was the same as that of example 1.

Taking 5g of 200 type active deoxidizing and drying agent as an example, the oxygen absorption and moisture absorption capacity is as follows (T is 25 ℃, RH is 80%): can absorb oxygen by 200ml and absorb moisture by 1.5 g.

Example 3

Formula of 300 type desiccant:

SiO₂11％

CaO 12％

Fe 60％

K₂O 3％

Fe₂O₃3％

MgO 3％

Al₂O₃8％

the preparation method of the type 300 desiccant is the same as that of example 1.

Taking 5g 300 type active deoxidizing and drying agent as an example, the oxygen absorption and moisture absorption capacity is as follows (T is 25 ℃, RH is 80%): can absorb 300ml of oxygen and absorb 1g of moisture.

Comparative example:

the active deoxidizing and drying agent is used for sealing and storing the metal iron sheet, and the test temperature is room temperature.

Two plastic bags of 15cm multiplied by 20cm are made of polyester plastic film, one of which is placed with a metal iron sheet and a 200-type active deoxidizing and drying agent, the other is placed with a metal iron sheet, then the plastic bags are sealed by a plastic sealing machine and exposed in the air, and after a period of time observation, a plurality of rusty spots are found on the surface of the metal iron sheet in the plastic bag which is not placed with the active deoxidizing and drying agent, and no rusty spot is found on the surface of the metal iron sheet in the plastic bag which is placed with the active deoxidizing and drying agent, thereby showing that the active deoxidizing and drying agent plays a very important role in the maintenance of metal products.

Claims (2)

1. An active deoxidizing and drying agent is characterized by comprising the following formula (weight percentage):

SiO₂10～90％

CaO 1～20％

Fe 1～60％

K₂O 1～5％

Fe₂O₃1～5％

MgO 1～10％

Al₂O₃1～20％

2. a method of preparing an active deoxygenated desiccant as claimed in claim 1 comprising the process steps of: firstly, refining mined natural active minerals, then mixing the natural active minerals according to the proportion, and uniformly stirring the mixture to obtain the product.