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CN-122011504-A - Nylon flame retardant and preparation method thereof

CN122011504ACN 122011504 ACN122011504 ACN 122011504ACN-122011504-A

Abstract

The invention provides a nylon flame retardant and a preparation method thereof, belonging to the technical field of high polymer materials, wherein the nylon flame retardant comprises, by weight, 30-50 parts of magnesium hydroxide, 5-10 parts of aluminum dipropyl hypophosphite, 10-15 parts of attapulgite, 5-10 parts of melamine polyphosphate, 2-3.5 parts of a silane coupling agent, 25-35 parts of silicon micropowder, 5-8 parts of silicon nitride and 10-17 parts of magnesium oxide. The difference between the particle size of the silicon micropowder and the particle size of the silicon nitride is smaller than 5 mu m, so that the particle size is matched, the overall dispersibility is improved, the mixing and grafting are more uniform, and the respectively prepared mixture, mixed solution and slurry are concentrated, mixed, dried and crushed, so that the production efficiency is improved.

Inventors

  • ZHEN WANQING
  • WANG PENG

Assignees

  • 嘉兴高正新材料科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260205

Claims (8)

  1. 1. The nylon flame retardant is characterized by comprising, by weight, 30-50 parts of magnesium hydroxide, 5-10 parts of aluminum dipropyl hypophosphite, 10-15 parts of attapulgite, 5-10 parts of melamine polyphosphate, 2-3.5 parts of a silane coupling agent, 25-35 parts of silicon micropowder, 5-8 parts of silicon nitride and 10-17 parts of magnesium oxide.
  2. 2. The nylon flame retardant according to claim 1, wherein the silica fine powder has a particle size of 2 to 15 μm, the silicon nitride has a particle size of 3 to 15 μm, the magnesium oxide has a particle size of 1 to 8 μm, and the magnesium hydroxide has a particle size of 2 to 10 μm.
  3. 3. The nylon flame retardant of claim 1, wherein the particle size of the attapulgite clay is set to 6-18 μm.
  4. 4. The nylon flame retardant of claim 1, wherein the particle size of the aluminum dipropyl hypophosphite is set to 3-18 μm and the particle size of the melamine polyphosphate is set to 10-30 μm.
  5. 5. The nylon flame retardant of claim 1, wherein the difference between the particle size of the fine silica powder and the particle size of the silicon nitride is less than 5 μm.
  6. 6. The preparation method of the nylon flame retardant is characterized by comprising the following steps of: Sieving, namely sieving magnesium hydroxide, aluminum dipropyl hypophosphite, attapulgite, melamine polyphosphate, a silane coupling agent, silicon micropowder, silicon nitride and magnesium oxide, and sieving by a 200-300-mesh sieving machine to avoid agglomeration of large particles; step two, mixing materials, namely uniformly mixing magnesium hydroxide, aluminum dipropyl hypophosphite, attapulgite and melamine polyphosphate according to a proportion to prepare a mixed material; Step three, mixing to obtain a mixed solution, and uniformly mixing a silane coupling agent, deionized water and ethanol according to the weight ratio of (1.5-2.5) to prepare the mixed solution; step four, mixing to obtain slurry, uniformly mixing the silicon micro powder, the silicon nitride, the magnesium oxide and the water which are mixed according to the proportion by weight of 1 (1-2), and preparing the slurry; Step five, stirring, namely adding the mixed material, the mixed liquid and the slurry into a reaction container according to a proportion to prepare a flame retardant mixture; and step six, drying and crushing, namely drying and crushing the flame retardant mixture to form flame retardant powder.
  7. 7. The method for producing a nylon flame retardant according to claim 1, wherein in the first step, the mesh size of the sieving machine is set to 200 to 300 mesh.
  8. 8. The method for preparing a nylon flame retardant according to claim 1, wherein in the fifth step, the stirring control temperature is set to 90 ℃ to 115 ℃ and the stirring speed is set to 300 to 800r/min.

Description

Nylon flame retardant and preparation method thereof Technical Field The invention belongs to the technical field of nylon flame retardant and a preparation method thereof. Background The nylon flame retardant is a chemical additive specially used for improving the flame retardant property of the nylon material, and the nylon material is used as a high-performance engineering plastic and is widely applied to various fields of automobile manufacture, electronics, electrics, spinning, aerospace and the like; The current nylon flame retardant generally comprises 35-50 parts of magnesium hydroxide, 5-10 parts of dipropyl aluminum hypophosphite, 10-15 parts of attapulgite, 5-10 parts of melamine polyphosphate and 1.2-1.6 parts of silane coupling agent, and the preparation method comprises the steps of mixing materials, stirring, filtering, drying and crushing; In the existing nylon flame retardant, the particle size of silicon nitride is 6-8 mu m, the particle size of magnesium oxide is 10-12 mu m, the silicon micro powder is a combination of silicon micro powder with the particle size of 2-4 mu m, silicon micro powder with the particle size of 8-10 mu m and silicon micro powder with the particle size of 20-35 mu m, when the particle size difference between the powder materials is large, the particle sizes are not matched, the overall dispersibility of the materials is poor, and the conditions of uneven mixing and grafting are easy to occur; In the preparation method of the nylon flame retardant, three groups of materials are needed to be formed by mixing the materials, wherein after the two groups of materials are mixed and reacted, the two groups of materials are mixed with the rest group of materials, dried and crushed, the preparation process is longer, and the production efficiency is influenced. Disclosure of Invention In order to solve the technical problems, the invention provides the nylon flame retardant and the preparation method thereof, which limit the particle size difference between all powder materials, so that the particle size is matched, the overall dispersibility is improved, the mixing and grafting are more uniform, and the production efficiency is improved. The nylon flame retardant comprises, by weight, 30-50 parts of magnesium hydroxide, 5-10 parts of aluminum dipropyl hypophosphite, 10-15 parts of attapulgite, 5-10 parts of melamine polyphosphate, 2-3.5 parts of a silane coupling agent, 25-35 parts of silicon micropowder, 5-8 parts of silicon nitride and 10-17 parts of magnesium oxide. Preferably, the particle size of the silicon micropowder is set to 2-15 μm, the particle size of the silicon nitride is set to 3-15 μm, the particle size of the magnesium oxide is set to 1-8 μm, and the particle size of the magnesium hydroxide is set to 2-10 μm. Preferably, the particle size of the attapulgite clay is set to 6-18 μm. Preferably, the particle size of the aluminum dipropyl hypophosphite is set to 3-18 μm and the particle size of the melamine polyphosphate is set to 10-30 μm. Preferably, the difference between the particle size of the fine silica powder and the particle size of the silicon nitride is less than 5 μm. The preparation method of the nylon flame retardant comprises the following steps: Sieving, namely sieving magnesium hydroxide, aluminum dipropyl hypophosphite, attapulgite, melamine polyphosphate, a silane coupling agent, silicon micropowder, silicon nitride and magnesium oxide, and sieving by a 200-300-mesh sieving machine to avoid agglomeration of large particles; step two, mixing materials, namely uniformly mixing magnesium hydroxide, aluminum dipropyl hypophosphite, attapulgite and melamine polyphosphate according to a proportion to prepare a mixed material; Step three, mixing to obtain a mixed solution, and uniformly mixing a silane coupling agent, deionized water and ethanol according to the weight ratio of (1.5-2.5) to prepare the mixed solution; step four, mixing to obtain slurry, uniformly mixing the silicon micro powder, the silicon nitride, the magnesium oxide and the water which are mixed according to the proportion by weight of 1 (1-2), and preparing the slurry; Step five, stirring, namely adding the mixed material, the mixed liquid and the slurry into a reaction container according to a proportion to prepare a flame retardant mixture; and step six, drying and crushing, namely drying and crushing the flame retardant mixture to form flame retardant powder. Preferably, in the first step, the mesh size of the sieving machine is set to 200-300 mesh. Preferably, in the fifth step, the stirring control temperature is set to 90-115 ℃ and the stirring speed is set to 300-800r/min. Compared with the prior art, the invention has the following beneficial effects: The difference between the particle size of the silicon micropowder and the particle size of the silicon nitride is smaller than 5 mu m, so that the particle size is matched, the overall dispersibility is improved, the