CN108192571B

CN108192571B - Artificial snow for paving ski tracks and preparation method thereof

Info

Publication number: CN108192571B
Application number: CN201711408817.2A
Authority: CN
Inventors: 常丽; 李次会; 高琳燕; 孙佳莹
Original assignee: Beijing Do&done Establish A Business Technology Co ltd
Current assignee: Beijing Do&done Establish A Business Technology Co ltd
Priority date: 2017-12-22
Filing date: 2017-12-22
Publication date: 2021-02-19
Anticipated expiration: 2037-12-22
Also published as: CN108192571A

Abstract

The invention relates to a preparation method of artificial snow for paving a ski trail, which comprises the steps of immersing inorganic salt particles in a high polymer aqueous solution with the mass percentage concentration of 0.01-1%, fully stirring or ultrasonically treating, filtering and collecting crystals, drying the crystals, mixing the dried crystals with water fluffy particles according to the mass ratio of 10-400: 1, mixing to obtain the product. The method provided by the invention has the advantages of easily obtained raw materials, simple steps, small friction coefficient of the prepared artificial snow and high sliding speed, so that the friction of the artificial snow on the sliding plate is small, good skiing experience can be brought, and the artificial snow has good water retention performance, long service life and good market application prospect.

Description

Artificial snow for paving ski tracks and preparation method thereof

Technical Field

The invention relates to the field of artificial snow, in particular to artificial snow for paving a ski run and a preparation method thereof.

Background

With the development of times, skiing sports are widely developed all over the world, the meaning of skiing is not only staying on sports, but also becomes a healthy and fashionable life style, and as outdoor sports, the biggest charm of skiing sports lies in enabling people to experience a feeling of returning nature in sports. However, due to the special characteristics, seasons, regions, temperatures, places and other factors, the skiing sports are greatly limited, the existing artificial snow condenses water vapor into ice flowers through cooling, the energy consumption is huge, the cost is high, the wide development is not facilitated, and therefore skiing in the world basically belongs to people with wealth and relatively free time. The invention aims to overcome the defects of the prior art and provides a preparation method of artificial snow for paving a ski run, which is not limited by seasons, environment, temperature and the like, can be used for preparing artificial snowflakes to simulate skiing movement and greatly reduces the cost.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a preparation method of artificial snow for paving a ski run. The artificial snow prepared by the method can bring good skiing experience and has long service life.

Specifically, according to the preparation method of the artificial snow, inorganic salt particles are immersed in a high polymer aqueous solution with the mass percentage concentration of 0.01% -1%, the mixture is fully stirred or subjected to ultrasonic treatment, crystals are collected through filtration, and the crystals are dried and then mixed with water fluffy particles according to the mass ratio of 10-400: 1, mixing to obtain the product.

The inorganic salt particles are the skeleton of the artificial snowflake, specifically can be selected from chloride, nitrate, carbonate, sulfate, phosphate and ammonium salt, and have the particle size of 10-400 micrometers. Preferred use of D in the invention₉₀Sodium chloride, potassium chloride, sodium carbonate, sodium nitrate, potassium carbonate, sodium nitrate, sodium hydrogen phosphate, calcium sulfate, and carbamide of 40-120 μm.

The high molecular substance can be selected from sodium carboxymethylcellulose, polyacrylate, polyacrylamide, carbomer, carboxymethyl chitosan, xanthan gum, pectin and the like. The polymer solution can be attached to the inorganic salt surface on the one hand to make the inorganic salt more lubricated fluffy and have certain water content and have the sense of touch and the appearance of snowflake, dissolve the corner part of inorganic salt crystal a small amount of simultaneously, improve the comparatively sharp edges and corners that the crystal exists, it is more sleek to optimize crystal structure messenger, thereby reduce the friction between snowflake and the slide, improve the speed sense of skiing and reduce the damage of artificial snowflake to the slide simultaneously, less salt crystal grain can grow out through the dynamic process of dissolving of salt in the polymer saturated salt solution and crystallization in addition the process of stewing, the particle size distribution of better regulation artificial snowflake, it has more fluffy sense and the mellow feeling of snowflake to make it.

The polymer aqueous solution comprises a polymer substance with the mass percentage concentration of 0.01-1%, and the preferable concentration is 0.05-0.8%. The invention discovers through a great deal of practice that if the concentration of the high molecular aqueous solution is too high, the production process is complicated, the cost is too high, and meanwhile, the adhesion among snowflakes is too large and lacks bulkiness; if the concentration of the high molecular water solution is too low, the lubrication degree of the snowflakes is low, the sliding speed is influenced, meanwhile, the water content of the snowflakes is low, the effective use time is short, and the later maintenance cost is higher.

In order to enhance the overall performance of the artificial snow, a lubricant may be further added to the aqueous polymer solution. The lubricant is an aqueous lubricant selected from glycerol, silicon-based lubricants, Kelly Jell lubricating gums, and the like. The mass percentage concentration of the lubricant in the polymer water solution is 0.01-0.5%.

As a preferable scheme of the invention, the inorganic salt particles can be stood in the polymer solution for 5-30 min, then fully stirred or subjected to ultrasonic vibration treatment for 1-10 min, and finally stood for 5-20 min. The operation can ensure that the high molecular substance is fully combined with the artificial snow framework, and the overall structural performance of the artificial snow framework is improved.

The artificial snow is dried preferably at 55-65 ℃ for 40-60 min, so that the obtained artificial snow has proper moisture content.

In order to reduce the friction coefficient of the artificial snow, improve the sliding feeling and reduce the later maintenance cost, the artificial snow provided by the invention is added with the water fluffy particles, the volume of the artificial snow is increased after water absorption, the artificial snow plays a role in supporting and improving the fluffy degree, the surface is very smooth and lubricated, and the effect of reducing the friction coefficient is played. Specifically, the water fluffy particles are water-absorbing polymer resin with the particle size of 20-500 meshes, and specifically, sodium polyacrylate particles, PET and the like can be selected. The water fluffy particles are in a micro dry and hard state in an anhydrous state, absorb water after contacting with water, the volume of the water is enlarged by 1-300 times, and the water fluffy particles are soft and lubricated in texture, so that the effects of lubrication and fluffy are achieved. The water fluffy particles and the inorganic salt are used together, so that the friction coefficient of the artificial snowflakes and the sliding plate can be reduced, meanwhile, the loosening of the snowflakes around can be driven by the increase of the particle volume in the later maintenance process, and the effects of supporting the snowflakes and improving the fluffy degree and a certain water retention effect are achieved.

In order to further improve the sliding friction property and the water retention property of the obtained artificial snow, enhance the use experience and improve the use time, the mass ratio of the dried crystals to the water fluffy particles is preferably 10-400: 1, and more preferably 50-300: 1. The above mass ratios all refer to the mass ratio of crystals to dry water-fluffy particles that are not water-swellable. The invention discovers through a great deal of practice that if the using amount of the water fluffy particles is too large, the snowflake fluffy degree is too high, and the texture is poor; if the amount of the water-fluff particles is too small, the effect of improving the lubricity by reducing the friction coefficient is not remarkably obtained.

In practical applications, the water-fluffy particles should be subjected to a water absorption treatment before being mixed with the crystals. In a preferable embodiment of the present invention, the water absorption capacity of the water-fluffy particles is 15 to 25 times of the mass of the water-fluffy particles.

The invention further protects the artificial snow prepared by the method.

The method provided by the invention has the advantages of easily obtained raw materials, simple steps, small friction coefficient of the prepared artificial snow and high sliding speed, so that the friction of the artificial snow on the sliding plate is small, good skiing experience can be brought, and the artificial snow has good water retention performance, long service life and good market application prospect.

Detailed Description

The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Example 1

The embodiment provides artificial snow for paving a ski run, which is prepared by the following method:

will D₉₀Immersing 200g of sodium chloride crystals with the particle size of 100 mu m into an aqueous solution containing 0.1 mass percent of sodium carboxymethylcellulose and 0.2 mass percent of glycerol, standing for 10min, carrying out ultrasonic treatment for 5min, standing for 10min, filtering out the crystals, drying for 50min at the temperature of 60 ℃, and fully mixing the dried crystals with 2.5g of water fluffy particle sodium polyacrylate (which is mixed with the crystals after absorbing 40ml of water) to obtain the sodium chloride-containing water fluffy particle sodium polyacrylate.

Example 2

will D₉₀Immersing 200g of 120 mu m sodium chloride crystals into an aqueous solution containing 0.08 percent of sodium carboxymethylcellulose and 0.4 percent of glycerin by mass percentage, standing for 10min, carrying out ultrasonic treatment for 5min, standing for 10min, filtering out the crystals, drying for 50min at 60 ℃, and fully mixing the dried crystals with 4g of water fluffy particle PET (mixed with the crystals after absorbing 40ml of water) to obtain the product.

Example 3

will D₉₀Immersing 200g of 80-micron sodium chloride crystals into an aqueous solution containing 0.3 mass percent of sodium carboxymethylcellulose and 0.2 mass percent of glycerol, standing for 10min, carrying out ultrasonic treatment for 5min, standing for 10min, filtering out the crystals, drying for 50min at 60 ℃, and fully mixing the dried crystals with 4g of water fluffy particle PET (mixed with the crystals after absorbing 30ml of water) to obtain the product.

Example 4

Compared with example 1, the difference is only that: the amount of water-fluff particles was 20 g.

Example 5

Compared with example 1, the difference is only that: the amount of water-fluff particles used was 1 g.

Example 6

Compared with example 1, the difference is only that: the concentration of sodium carboxymethylcellulose in the polymer solution was 1%.

Example 7

Compared with example 1, the difference is only that: the concentration of sodium carboxymethylcellulose in the polymer solution was 0.01%.

Example 8

Compared with example 1, the difference is only that: the polymer solution does not contain glycerol.

Example 9

Compared with example 1, the difference is only that: sodium polyacrylate is used to replace sodium carboxymethyl cellulose in the polymer solution.

Comparative example 1

Compared with example 1, the difference is only that: no water fluff particles sodium polyacrylate were used.

Experimental example 1: slip detection

Paving a ski run by adopting the artificial snow provided by each embodiment and each comparative example, wherein the length of the ski run is 2 meters, the gradient is 25 degrees, and the thickness of paving the artificial snow is 10 cm; the glide time from top to bottom is recorded and a boost is made if the intermediate dwell time exceeds 5 s. The results are shown in Table 1.

TABLE 1

The artificial snow has the advantages that the friction coefficient is small, the sliding speed is high, the friction on the sliding plate is small, and better skiing experience can be brought.

Experimental example 2: post maintenance

The water retention property determines the service life of the artificial snow. 2000g of each of the artificial snow provided in each of the examples and comparative examples was laid under the conditions described in Experimental example 1, and left standing at 15 ℃ and 60% humidity until the sample was dried and the sliding was not simulated, and the time was measured. The results are shown in Table 2.

TABLE 2

From the above results, it is understood that the artificial snow provided by the present invention has excellent water retention property and long service life.

Although the invention has been described in detail hereinabove by way of general description, specific embodiments and experiments, it will be apparent to those skilled in the art that many modifications and improvements can be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. A preparation method of artificial snow for paving a ski run is characterized in that inorganic salt particles are immersed in a high polymer aqueous solution with the mass percentage concentration of 0.05-0.8%, fully stirred or ultrasonically treated, filtered and collected with crystals;

standing the inorganic salt particles in the solution for 5-30 min, fully stirring or ultrasonically treating for 1-10 min, standing for 5-20 min, and then performing subsequent filtering operation;

the inorganic salt particles are D₉₀Sodium chloride, potassium chloride, sodium carbonate, sodium nitrate, potassium carbonate, sodium hydrogen phosphate and calcium sulfate with the particle size of 40-120 mu m;

the high molecular substance in the high molecular water solution is selected from ion-resistant sodium carboxymethyl cellulose;

the polymer aqueous solution also contains a lubricant with the mass percentage concentration of 0.01-0.5%; the lubricant is glycerol;

drying the crystals, and mixing the dried crystals with water fluffy particles according to the mass ratio of 50-300: 1 to obtain the crystal; the water fluffy particles are sodium polyacrylate particles or PET with the particle size of 20-500 meshes; the water-absorbing treatment is carried out on the water-swelling particles before the water-swelling particles are mixed with the crystals, and the water absorption capacity of the water-swelling particles is 15-25 times of the mass of the water-swelling particles.

2. The method according to claim 1, wherein the drying is carried out at 55 to 65 ℃ for 40 to 60 min.

3. Artificial snow produced by the method of claim 1 or 2.