JPS59156988A - Calcium peroxide pellet - 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 The present invention relates to calcium peroxide with good water disintegrability,
More specifically, it relates to calcium peroxide granules that have good morphological stability as granulated products, are easy to handle during distribution or use, are safe from an environmental hygiene perspective, and have good disintegration properties after application. It is.

Conventionally produced granulated calcium peroxide has poor water disintegration properties and cannot fully demonstrate its effect during crop growth.Also, since the particles do not disintegrate, the time for oxygen generation cannot be controlled; The development of calcium peroxide granules with good water disintegrability has been desired because the residue after generation solidifies to form nodules and locally increases the alkalinity.

The present inventors have arrived at the present invention as a result of intensive studies aimed at developing calcium peroxide granules having sufficient granule hardness and good disintegration properties in water.

That is, the present invention provides a calcium peroxide granule containing calcium peroxide, a binder consisting of a vegetable mucilage belonging to a complex polysaccharide and/or an etherified derivative thereof, and bentonite as essential components. It is something.

Calcium peroxide used in the present invention may be Caloxo or Calper (both trademarks of Nippon Peroxide Co., Ltd.), which are commercially available as soil conditioners, or may be a compound produced by slaked lime or quicklime and hydrogen peroxide. Further, a dehydrated and dried powder is preferable, and a water-containing powder may also be used. The effective oxygen range is 1-12%, preferably 4-12%.
9 inches is good.

Examples of vegetable mucilages include locust bean gum, guar gum, and tamarind bean gum, which are currently used in large quantities for food, paper manufacturing, and printing. Etherified derivatives thereof such as shrimp chlorohydrin, ethylene oxide, propylene oxide, and sodium monochloroacetate are commercially available.

Bentonite may be either sodium type or calcium type.

The blending ratio when manufacturing the product of the present invention is preferably 20 to 80 parts by weight of calcium peroxide, 0.2 to 5 i% by weight of vegetable mucilage or its etherified derivative, and 2 parts by weight of bentonite.
~80 parts by weight. It can also be made by adding slaked lime as a bulking agent.

During production, the ingredients are first mixed uniformly, (1) then compressed into a plate shape using a pressure molding machine, and then completely crushed and granulated, or (2) a tilted plate straddling a tilted drum. There are two methods, such as rotating a container and continuously supplying raw material powder and water into it to granulate it, and (3) humidifying the raw material powder and then extruding it through a right hole plate or screen to granulate it. A method can also be used.

Calcium peroxide used in the present invention is usually produced from aqueous peroxide and slaked lime or quicklime, and thus contains a large amount of slaked lime as an impurity. This slaked lime absorbs carbon dioxide gas in the outside air and becomes carbonated lime, hardening into lumps and having an adverse effect, and further reducing the disintegration ability of granules in water.
The granules of the present invention exhibit good disintegration properties even after application because they have the effect of suppressing the absorption of moisture and carbon dioxide from the outside air. Therefore, there is no scattering of powder, which is good in terms of environmental hygiene, and adhesion to leaves can be prevented, and mechanical spraying is also possible. This is because the swelling action of the vegetable mucilage or its derivative used as an additive and bentonite has a synergistic effect to improve disintegration in water, and the binder has a strong effect on water disintegration in bentonite. It is believed that this is because the calcium peroxide granules of the present invention are easy to handle and can be safely and efficiently sprayed as shown in the figure above 0, which is thought to increase the cohesive force and create more dense granules. Another feature is that the effective period of the oxygen supply effect on cultured plants by calcium peroxide after application can be adjusted.

The invention will now be explained with examples. In addition, parts and 忤 in the examples indicate parts by weight and parts by weight, respectively.

Example 1 35% hydrogen peroxide solution, 94 parts of powdered calcium peroxide (effective oxygen 5.8%, water content 0) prepared from slaked lime, 1 part of various binders and 5 parts of bentonite were mixed in a blender. Mixed until homogeneous. Next, this was processed using a roll press machine at a pressure of 170 mm to obtain a compressed plate-like product. Next, the plate-like material is crushed in a knife hammer mill, and then sieved with a screen for those with a diameter of 1 to 2 tran, those less than 1fi are returned to the roll press, and those over 2wn are crushed in a knife hammer mill. Re-crush, 1 to 2 granules 96
I got the department.

As a comparative product, granules were produced in the same manner using polyvinyl alcohol, sodium alginate, hydroxyethyl cellulose, carboxymethyl cellulose, and cornstarch as the above binders, and the damage rate of the granules, disintegration in water immediately after granulation, The disintegration properties in water after application (after being left outdoors for 10''B) were compared.

The results are shown in Table 1 below.

Table 1: Damage rate test method: Precisely weigh 2g of the sample and place it in a 20d equivalent test tube with a stopper.
The mixture was shaken up and down for 10 minutes at 300 times/min in a shaker, then passed through an inertia sieve, and the weight of the granules on the sieve was weighed and subtracted according to the following formula.

The test was conducted based on the "Disintegration test method for granulated fertilizer" of the Fertilizer Control Law, and the following standard was displayed.

◎: Moderate disintegration rate of 80% or more ○: Disintegration rate in water 50 ×: Disintegration rate in water less than 10%, the calcium peroxide granules of the present invention have good breakage rate and disintegration in water. Also, it has good disintegration properties in water even after being left outdoors for 10 days.

Example 2 90 parts of calcium peroxide powder (available oxygen e.o.%) prepared with 35% hydrogen peroxide and quicklime, hydroxyethyl guar gum (product name Indulca PA-30, Italy r Ce5alpinia S.p. After homogeneously mixing 1 part (made by A) and 9 parts of bentonite in a blender, 5 parts of water was added and further mixed, and a diameter of 1 part was made using a screw type extrusion molding machine.
A cylindrical granule having a length of 1+l+111 and a length of 2 was obtained.

As a comparative product, 10 parts of bentonite was added and granulated in the same manner without adding a binder.

The damage rate and disintegration in water were measured in the same manner as in Example 1. The results are shown in Table 2.

Table 2 Compared to bentonite alone, the product of the present invention is superior in breakage rate and disintegration in water, especially in disintegration in water after being left outdoors.

Claims (1)

[Claims] 1. Calcium peroxide granules 0 characterized by containing calcium peroxide, a binder consisting of a vegetable mucilage belonging to complex polysaccharides and/or its etherified derivative, and bentonite as essential components.