Method for preparing encapsulated red phosphorus

A technology for coating red phosphorus and red phosphorus powder, applied in the direction of fibrous fillers, dyeing low molecular organic compounds, etc. , The effect of maintaining phosphorus content and good stabilization effect

Active Publication Date: 2011-04-13
TONGCHENG SHINDE NEW MATERIALS
View PDF2 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Red phosphorus is transformed from yellow phosphorus (also known as white phosphorus) through a high temperature above 260 degrees. The commonly used industrial product is purple-red fine powder of 10-1000 μm. The insecticide aluminum phosphide and pesticide raw materials, as a highly efficient flame retardant in polymer materials such as plastic rubber, is a strange discovery in the scientific community. However, in humid air, the surface of red phosphorus particles is prone to oxidation and oxidation with oxygen. The disproportionation reaction generates various phosphorus-containing acids and releases toxic phosphine gas. Phosphorus-containing acids have a great negative impact on the further application of red phosphorus and even fail. Toxic phosphine gas will also pollute the workplace and threaten Personnel health
[0004] At present, metal hydroxides are deposited on the surface of red phosphorus for stabilization, such as hydroxides of aluminum, magnesium, zinc, calcium, tin, nickel, silver, and titanium, and there are also methods of depositing metal phosphates, but due to the heat of these compounds Insufficient stability. When used as a flame retardant, bound water and crystal water will be released due to heat during the processing of plastics, resulting in the degradation of polymer material

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add 30kg of water, 20kg of red phosphorus powder with a fineness of 50μm, and 0.1kg of aluminum diethyl hypophosphite (Clariant OP1230) into the reactor with stirring, and then start stirring, and adjust the pH value of the solution to 4 with 5% sulfuric acid solution. And raise the temperature to 55°C, adjust the pH value to neutral with 5% sodium hydroxide solution, keep warm at 55°C for 60 minutes, cool to room temperature, filter and wash with 10% residual moisture, transfer to a vacuum oven to dry at 100°C for 2 Hour, obtain coated red phosphorus product, and measuring moisture is 0.05%. The stability of the coated red phosphorus was tested and the data are listed in Table 1 below. Test method: Red phosphorus is prone to disproportionation reaction under hot and humid aerobic conditions, producing oxygen-containing phosphoric acid of various valences and releasing phosphine PH 3 , so the stability of red phosphorus can be characterized by measuring the amount of p...

Embodiment 2

[0021] Add 30kg of water, 20kg of red phosphorus powder with a fineness of 100μm, and 0.4kg of aluminum diethyl hypophosphite (Clariant OP1230) into the reactor with stirring, and start stirring, adjust the pH value of the solution to 4 with 5% sulfuric acid solution, and raise the temperature to 55°C, adjust the pH value to neutral with 5% sodium hydroxide solution, continue to keep warm at 60°C for 30 minutes, cool to below 30°C, filter and wash with 8% residual moisture, and transfer to a vacuum oven to dry at 90°C for 2 Hour, obtain coated red phosphorus product, and measured moisture content is 0.1%. The stability of coated red phosphorus was tested according to the method of Example 1, and the data are listed in Table 1 below.

[0022]

Embodiment 3

[0024] Add 30kg of water, 20kg of red phosphorus powder with a fineness of 100μm, and 1kg of aluminum diethyl hypophosphite (Clariant OP1230) into the stirred reactor in sequence, start stirring, adjust the pH value of the solution to 4 with 5% sulfuric acid solution, and raise the temperature to 55°C, adjust the pH value to 7 with 5% sodium hydroxide solution, continue to keep warm at 60°C for 30 minutes, cool down to below 30°C, filter and wash with residual water to 12%, transfer to a vacuum oven for drying at 80-120°C for 2 Hour, obtain coated red phosphorus product, and measured moisture content is 0.06%. The stability of coated red phosphorus was tested according to the method of Example 1, and the data are listed in Table 1 below.

[0025]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for preparing encapsulated red phosphorus. The method comprises the following steps of: mixing red phosphorus powder and hypophosphite with two organic groups to prepare water suspension, wherein the molecular formula of the hypophosphite with two organic groups is (R1R2PO2)nM; adjusting the pH value of the solution to be 3 to 5 by using acid solution, raising the temperature to 50 to 60 DEG C, adjusting the pH value until the solution is neutral by using aqueous alkali; and continuously stirring for 0.5 to 2 hours, cooling and suction-filtering, washing with water, and performing vacuum drying to obtain the encapsulated red phosphorus product. In the method for preparing the encapsulated red phosphorus, the hypophosphite with two organic groups is directly added into the suspension of red phosphorus, the hypophosphite with two organic groups is deposited on the surfaces of the red phosphorus particles directly by adjusting the pH value of the solution, good stabilization effect can be used by using a small amount of a stabilizing agent, the phosphorus content of the product can be kept as much as possible, and the double effect of stabilizing and inflaming retarding can be achieved, so that an ideal and stable encapsulated red phosphorus product can be obtained.

Description

technical field [0001] The invention relates to a preparation method of coated red phosphorus. [0002] Background technique [0003] Red phosphorus is transformed from yellow phosphorus (also known as white phosphorus) through a high temperature above 260 degrees. The commonly used industrial product is purple-red fine powder of 10-1000 μm. The insecticide aluminum phosphide and pesticide raw materials, as a highly efficient flame retardant in polymer materials such as plastic rubber, is a strange discovery in the scientific community. However, in humid air, the surface of red phosphorus particles is prone to oxidation and oxidation with oxygen. The disproportionation reaction generates various phosphorus-containing acids and releases toxic phosphine gas. Phosphorus-containing acids have a great negative impact on the further application of red phosphorus and even fail. Toxic phosphine gas will also pollute the workplace and threaten Personnel health. [0004] At present...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C09C1/00C09C3/08
Inventor 熊政治周郁菊
Owner TONGCHENG SHINDE NEW MATERIALS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap