JPH06503478A - Glass fiber used as a substrate for hydroponic cultivation - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Glass fiber used as a substrate for hydroponic cultivation The present invention is a glass fiber used as a substrate for hydroponic cultivation. Regarding fiber.

More specifically, the present invention relates to cultivation without soil, that is, hydroponic cultivation (soil-free cultivation). used as an essential element of the base material or base layer for related to glass fibers.

Generally speaking, substrates for hydroponic cultivation are characterized by the circulation of nutrient solutions within the substrate and the wetting effects. Due to the influence of both mechanical stress and root development, It is necessary to have sufficient mechanical resistance to avoid. Additionally, the substrate may be a plant or nutrient. Allowing for the introduction of aqueous solutions and ensuring good aeration of the roots It requires that. Clearly, efforts or current efforts are being made to find the lowest possible cost and density. It is being done.

Substrates for indoor cultivation are generally made from mineral wool. These base materials have nurturing properties has. However, mineral wool cannot be used for external dehydration. o-extract-ion method) or centrifugation method. Obtained from Ba. Using these methods typically results in 60 to 8 A product with a relatively low density of 0 kg/m3 is obtained.

A substrate for indoor cultivation made of glass wool was proposed. These glass woo The method is an internal hydro-extraction method. method) or by a method known as centrifugation as detailed below. Obtained from Iba. The density of these substrates is significantly lower, 15-50 kg/m ” is the most common density.

Do not use water 11u, culture medium 12, etc. V) i2 Satisfy the required characteristics The force to cause the 4s 1s and 1s composition is explained below.

EP 201426 specifies the water requirements and mechanical requirements for hydroponics1. Glass composition for fibers used as a substrate for hydroponic culture to satisfy is listed.

While barking, the constituents of the niobium and other components released upon contact with nutrient-dissolved Flk. ruchisea) may be desirable or absent for certain cultivation systems.

7. The aim of the new technology is to develop two unique features, including fibers produced by internal dehydration. The purpose of the present invention is to provide a fiber with a composition of , for constructing a substrate for cultivation without soil, that is, for hydroponic cultivation.

The objects of the present invention are achieved by using a fiber having the following gas composition: Thing 1: I can do it.

Na, 0 13 - 18.596 Impurities ≦ 19 too B20. , Li:Ol and F are equal to or less than 196.

Impurities also include all compounds not specifically mentioned in the table above, and these are It is introduced by the natural raw materials used to make the glass composition.

These impurities include sulfates added to the mixture of vitrified raw materials. Also included are some components resulting from purification agents such as.

The glass fibers of the present invention can be obtained from an internal dehydration process. By this method , it is possible to obtain Phi 11 containing almost no non-fibrillated particles, and it is also possible to obtain It can be manufactured. Furthermore, with these technologies, it is possible to create base materials with low occlusion. It becomes possible.

Two types of fiber manufacturing techniques are detailed in numerous publications. Yota In particular, French patents Nos. 1,382,917 and 2,443,436 are particularly Please refer to it. With these techniques, the pores are introduced into the molten glass or inside the centrifuge. , is injected onto its surrounding strip under the effect of centrifugal force. very large number of orifices on this strip. The glass is passed through these chairs. It is ejected horizontally. The resulting glass net is It is conveniently stretched and transformed into a fiber.

The glass fiber of the present invention is a glass fiber having physical characteristics that can be made into fibers by this method. Obtained from the lath part. These characteristics are defined below. In particular, these Generally at temperatures below 1200°C, preferably below +150°C It has a poise viscosity.

Another important physical feature for fiber manufacturing is devitrification (devitrification). if 1ca-+1on) temperature, i.e., for the formation of crystals in a glassy mass the corresponding temperature.

In fact, these crystals can block the centrifuge orifice.

(2) devitrification can be characterized by a short temperature - crystal growth rate The temperature of the liquid is now known as the liquidus (7). .

m = crystal growth rate or maximum temperature.

Generally speaking, it is the difference between the temperature corresponding to the viscosity of +000 poise and the temperature of the liquidus line. Preferably it is equal to or greater than 50°C.

It is desirable to obtain a minimum crystal growth rate, ie, a growth rate of less than 3 microns per minute.

Another important feature to consider is the hydrolytic resistance of the composition. , especially if the composition is intended to be used as a substrate for hydroponic cultivation. This is especially true when The second resistor is the standard method of the German Glass Technology Association (DGG). Measured according to the law.

The DGG constituting the fiber of the present invention is equal to or greater than 30 milligrams. Small is preferable.

The composition of the glass fiber of the present invention is characterized by a small proportion of boron oxide.

In fact, B20. If the sum of the contents of Li + O and F exceeds 196 weight, the nutrients The amount of these elements liberated from the glass fiber in solution is below the tolerance limits of some plants. exceed.

(The composition of glass fiber/< used continuously is B2O3 or about 596% by weight, The weight of L120 and F is 296 to 396. These elements affect the various properties of glass. Play an important role in quality. In particular, they reduce the risk of viscosity and devitrification. , improves hydrolysis resistance.

Despite the significant reduction in the proportion of these compositions and their suppression, the correct chemical and It is possible to maintain rational properties.

Thus, increasing the proportion of alkali oxides has the effect of inducing the Calo rate of devitrification. The viscosity can be maintained within acceptable limits without sacrificing the sodium oxide content. There is 1396 in town.

The content of Na20 should not exceed about 18.596. If this value is exceeded, The glass DGG is too high and the fiber Ili! influence mechanical properties .

Alkaline oxides may be incorporated into the construction of the fibers of the present invention. Hidden Therefore, 1x20 and L120 reduce viscosity without significant reduction in DGG. It can be lowered.

Viscosity and devitrification are also limited by raw alkali oxides of CaO and MgO. maintained within the world. In particular, the CaO content should be adjusted to avoid too significant an increase in viscosity. must be at least equal to 506 weight. If it exceeds 9%, Ca O gives rise to a significantly increased risk of devitrification.

Aj? 20z is the composition of the glass phino 1 of the invention in a proportion of at least 1% by weight. introduced inside. This is mainly due to the fact that D It has the effect of maintaining GG at a value below 30 milligrams. A in the composition of the present invention The proportion of f203 shall not exceed 8%. If the value exceeds 2, viscosity and devitrification The danger increases significantly.

ZnO1Mn01Fe20. , TiO□ and P2O5 It may also be incorporated into the composition of bright fibers.

While these oxides improve DGG, they do not affect the devitrification of the glass. It has the effect of making the crow more fluid.

The series of tests listed in the table test whether the compounds present in the glass composition are Physical 4′! It shows the influence it has on the symptoms.

Preferred glass compositions of the invention have the following compounds within the following limits expressed in weight percent: to include.

5i02 58 -67% A120i 4.5 - 7.5% Cao 5-9045 Impurity ≦ +9< B, 03. L i. The total content of 0 and F is 1% or less.

Another group of desirable crow compositions of the present invention is described below.

These compositions differ in that part of the hoop or tun is replaced by potassium. , this potassium is absorbed by the phosphorium in contact with the nutrient solution. There are two things that limit the release of These limits are expressed as weight 96.

\1no(tsu□306 T + 020 396 Impurities ≦ +o6 The total content of B203, L1□O1 and F is 1% or less.

The present invention also provides fibers made from fibers obtained from the glass compositions according to the present invention. It also relates to basic methods for hydroponic cultivation.

These substrates made by internal centrifugation advantageously have a low density and are low in nutrients. It can be easily impregnated with a solution. These substrates of the invention are suitable for plants. It does not play any nutritional role nor does it inhibit plant growth. And Sakae When in contact with the nutrient solution, harmful elements may be released in amounts that can inhibit plant growth. I don't know.

In particular, the inventors have discovered that boron, lithium, and fluoride are released on contact with nutrient solutions. When the proportion of the element is greater than 0.5 mg, C, it may be harmful to any cultivation system. and showed. Similarly, in a cultivation system consisting of excessive release of lithium and fluorine, the image i When contacted with the nutrient solution present, the substrate of the present invention contains 0.5 mg/'1 or less. It releases the following amounts of boron, lithium, and 7 atoms.

Careful observation of the behavior of cultivated plants to ensure that they have no harmful effects on plants. It was tested through observation of its growth.

The substrate according to the invention develops an advantageous specific structure that improves its mechanical resistance. do.

The substrate according to the invention is as defined in Huni/S patent application FR 8903372. In the second structure, the fiber has an isotropic structure. Oriented along random directions to give particularly improved @qualitative resistance It is.

The unpublished French patent application FR90158909 describes the basic mechanical Another structure for improving resistance has been described. This base material has fine It is made of a mixture of fibers and thicker fibers. Thick phino Provides improved mechanical resistance to the base.

The advantages of the present invention are demonstrated by the experimental tests detailed below.

Boron, Rikokam, and Fluorine released from the basal 1 year old during contact with the nutrient solution Tested. Two samples A and B of the substrate, which are of equal dimensions and of the invention (corresponding to compositions 4 and 11 in the table, respectively) are separately p) 15. The specimens were immersed in 9 equal composition nutrient solutions for 6 weeks.

Boron, lithium released by the two tested substrates by the end of 6 weeks The amounts of base toxins (in mg per 1f of nutrient solution) are shown in the following table: AB Fluorine 0.06 0.03 Boron 0.07 0.09 Lithium 0.0+8 0.040 Total 0.148 0.160 These tests test the composition of the glass fibers that make up the substrate or the Effect on the amount of primary boron, lithium and fluorine released by the fiber This test shows that the glass wool base is compatible with the cultivation system of Dinghete. It becomes possible to create two.

table Table (continued)

Claims (8)

[Claims] 1. A glass fiber used as a component of a substrate for hydroponic cultivation. The composition shall primarily contain the following compounds in the following proportions expressed in % by weight: SiO 2 55-70% Al2O3 1-8% CaO　　　5-9% MgO 1.5-4% Na2O 13-18.5% K2O　　　0.5-10% Fe2O3 0-4% ZnO 0-4% MnO 0-4% TiO2 0-4% P2O5 0-4% Impurities ≦1% And the total content of B2O3, Li2O, and F is 1% or less. : Glass fiber characterized by: 2. The glass fiber according to claim 1 has a composition mainly consisting of: Contains the following compounds in the following proportions expressed in weight %: SiO2 58-67 % Al2O3 4.5-7.5% CaO　　　5-9% MgO 1.5-4% Na2O 17-18.5% K2O　　　0.5-4% Fe2O3 0-3% ZnO 0-3% MnO 0-3% TiO2 0-4% P2O5 0-4% Impurities ≦1% and the total content of B2O3, Li2O, and F is 1% or less A glass fiber characterized by; 3. The glass fiber according to claim 1 has a composition mainly consisting of: Contains the following compounds in the following proportions expressed in weight %; SiO2 55-65 % Al2O3 4.5-7.5% CaO　　　5-8% MgO 1.5-4% Na2O 13-17.5% K2O 4-10% Fe2O3 0-3% ZnO 0-3% MnO 0-3% TiO2 0-3% P2O5 0-3% Impurities ≦1% The total content of B2O3, Li2O, and F must be 1% or less. : Glass fiber characterized by: 4. Hydroponics constructed of glass fibers with a composition mainly containing the following compounds: Cultivation substrate, which is expressed as the percentage or weight percent of the above compounds as follows: thing; SiO2 55-70% Al2O3 1-8% CaO　　　5-9% MgO 1.5-4% Na2O 13-18.5% K2O　　　0.5-10% Fe2O3 0-4% ZnO 0-4% MnO 0-4% TiO2 0-4% P2O5 0-4% Impurities ≦1% and the total content of B2O3, Li2O, and F is 1% or less. : Substrate for hydroponic cultivation characterized by: 5. In the substrate for hydroponic cultivation according to claim 4, the substrate is composed of The composition of the fiber mainly contains the following compounds, and the proportion of said compounds is as follows in weight%. What it looks like: SiO2 55-67% Al2O3 4.5-7.5% CaO　　　5-9% MgO 1.5-4% Na2O 17-18.5% K2O　　　0.5-5% Fe2O　0-3% ZnO 0-3% MnO 0-3% T1O2 0-3% P2O5 0-3% Impurities ≦1% and the total content of B2O3, Li2O, and F is 1% or less A substrate for hydroponic cultivation characterized by: 6. In the hydroponic cultivation substrate according to claim 4, the glass constituting the substrate The composition of the fiber mainly contains the following compounds, and the proportion or weight percent of the compounds is as follows: What it looks like: SiO2 55-65% A12O3 4.5-7.5% CaO 5-8% MgO 1.5-4% Na2O 13-17.5% K2O 4-10% Fe2O　　　0-3% ZnO 0-3% MnO 0-3% TiO2 0-3% P2O5 0-3% Impurities ≦1% And the total content of B2O3, Li2O, and F is 1% or less. A substrate for hydroponic cultivation characterized by; 7. In the hydroponic cultivation substrate according to claim 4, 5 or 6, The substrate is formed of fibers that release when contacted with a nutrient solution. It is characterized by the nature and concentration of the elements that cause the plant to have no effect on the production of plants. Base material for hydroponic cultivation. 8. In the hydroponic cultivation substrate according to claim 7, the substrate is treated with a nutrient solution. Boron, lithium or Hydroponic cultivation characterized by having a fluorine content of 0.5 mg/l or less Base material for use.