Nylon flame retardant and preparation method thereof

Abstract

The invention provides a nylon flame retardant and a preparation method, and belongs to the technical field of high polymer materials, the nylon flame retardant comprises, by weight, 30-50 parts of magnesium hydroxide, 5-10 parts of dipropyl aluminum 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 silica powder, 5-8 parts of silicon nitride, and 10-17 parts of magnesium oxide. The difference between the particle size of the silica powder and the particle size of the silicon nitride is smaller than 5 microns, so that the particle sizes are matched, the overall dispersity is improved, and mixing and grafting are more uniform; and the mixed material, the mixed liquid and the slurry which are respectively prepared are intensively mixed, dried and crushed, so that the production efficiency is improved.

Description

Technical Field

[0001] This invention relates, in particular, to a nylon flame retardant and its preparation method. Background Technology

[0002] Nylon flame retardants are chemical additives specifically designed to improve the flame retardant properties of nylon materials. Nylon, as a high-performance engineering plastic, is widely used in many fields such as automobile manufacturing, electronics, textiles, and aerospace. Nylon itself is flammable, which to some extent limits its use in some situations with high fire protection requirements. Nylon flame retardants can improve the flame retardant effect of nylon materials through physical or chemical actions, making them less likely to burn when exposed to a fire source, thereby ensuring the safety of personnel and property.

[0003] Current nylon flame retardants typically include 35-50 parts magnesium hydroxide, 5-10 parts dipropyl aluminum hypophosphite, 10-15 parts attapulgite, 5-10 parts melamine polyphosphate, and 1.2-1.6 parts silane coupling agent. The preparation method involves mixing the materials, stirring, filtering, drying, and pulverizing.

[0004] In this existing nylon flame retardant, the particle size of silicon nitride is 6-8μm, the particle size of magnesium oxide is 10-12μm, and the silicon micro powder is a combination of silicon micro powder with a particle size of 2-4μm, silicon micro powder with a particle size of 8-10μm, and silicon micro powder with a particle size of 20-35μm. When the particle size difference between the various powders is large, the particle size mismatch can easily lead to poor overall dispersion of the material, resulting in uneven mixing and grafting.

[0005] Furthermore, the preparation method of this nylon flame retardant requires mixing materials to form three groups of materials. Two of these groups are mixed and reacted before being mixed with the remaining group, dried, and pulverized. This preparation process is lengthy and affects production efficiency. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a nylon flame retardant and its preparation method, which limits the difference in particle size between various powders, thereby matching particle sizes, improving overall dispersibility, making mixing and grafting more uniform, and increasing production efficiency.

[0007] A nylon flame retardant, by weight, comprises 30-50 parts magnesium hydroxide, 5-10 parts dipropyl aluminum hypophosphite, 10-15 parts attapulgite, 5-10 parts melamine polyphosphate, 2-3.5 parts silane coupling agent, 25-35 parts silica powder, 5-8 parts silicon nitride, and 10-17 parts magnesium oxide.

[0008] Preferably, the particle size of the silicon micro powder 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.

[0009] Preferably, the particle size of the attapulgite is set to 6-18 μm.

[0010] Preferably, the particle size of dipropyl aluminum hypophosphite is set to 3-18 μm, and the particle size of melamine polyphosphate is set to 10-30 μm.

[0011] Preferably, the difference between the particle size of the silicon micropowder and the particle size of silicon nitride is less than 5 μm.

[0012] A method for preparing a nylon flame retardant includes the following steps:

[0013] Step 1: Sieving. Magnesium hydroxide, dipropyl aluminum hypophosphite, attapulgite, melamine polyphosphate, silane coupling agent, silica powder, silicon nitride, and magnesium oxide are sieved through a 200-300 mesh sieve to avoid large particles from clumping.

[0014] Step 2: Material mixing. Mix magnesium hydroxide, aluminum dipropyl phosphite, attapulgite, and melamine polyphosphate in a specific ratio to form a mixture.

[0015] Step 3: Mix to obtain a mixture. Mix the silane coupling agent, deionized water, and ethanol in a weight ratio of 2:(1.5-2.5):(1.5-2.5) to obtain a mixture.

[0016] Step 4: Mix to obtain a slurry. Mix the silicon micro powder, silicon nitride, magnesium oxide and water in a weight ratio of 1:(1-2) to make a slurry.

[0017] Step 5: Stirring. Add the mixture, liquid, and slurry to the reaction vessel in proportion to prepare the flame retardant mixture.

[0018] Step 6: Drying and pulverizing. The flame retardant mixture is dried and pulverized to form flame retardant powder.

[0019] Preferably, in step one, the sieve mesh of the screening machine is set to 200-300 mesh.

[0020] Preferably, in step five, the stirring temperature is set to 90℃-115℃, and the stirring speed is set to 300-800 r / min.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The difference between the particle size of silicon micro powder and silicon nitride is less than 5 μm, which makes the particle size match, improves the overall dispersibility, and makes the mixing and grafting more uniform. Furthermore, the separate preparation of mixtures, liquids and slurries is carried out in a centralized manner for mixing, drying and pulverizing, which improves the production efficiency. Attached Figure Description

[0023] Figure 1 This is a flowchart of the preparation method for nylon flame retardants. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings:

[0025] A nylon flame retardant, by weight, comprises 30-50 parts magnesium hydroxide, 5-10 parts dipropyl aluminum hypophosphite, 10-15 parts attapulgite, 5-10 parts melamine polyphosphate, 2-3.5 parts silane coupling agent, 25-35 parts silica powder, 5-8 parts silicon nitride, and 10-17 parts magnesium oxide.

[0026] In this embodiment, specifically, the particle size of silicon micro powder is set at 2-15 μm, the particle size of silicon nitride is set at 3-15 μm, the particle size of magnesium oxide is set at 1-8 μm, and the particle size of magnesium hydroxide is set at 2-10 μm.

[0027] In this embodiment, the particle size of the attapulgite is specifically set to 6-18 μm.

[0028] In this embodiment, specifically, the particle size of dipropyl aluminum hypophosphite is set to 3-18 μm, and the particle size of melamine polyphosphate is set to 10-30 μm.

[0029] In this embodiment, specifically, the difference between the particle size of silicon micro powder and the particle size of silicon nitride is less than 5 μm. If the particle size of silicon micro powder is set at 2-5 μm, then the particle size of silicon nitride is set at 3-5 μm, thereby making the particle sizes of silicon micro powder and silicon nitride coordinated, ensuring overall dispersion, and making mixing and grafting more thorough.

[0030] As attached Figure 1 As shown, a method for preparing a nylon flame retardant specifically includes the following steps:

[0031] S1: Sieving. Magnesium hydroxide, dipropyl aluminum hypophosphite, attapulgite, melamine polyphosphate, silane coupling agent, silicon micro powder, silicon nitride, and magnesium oxide are sieved through a 200-300 mesh sieve to avoid large particles from clumping.

[0032] S2: Material mixing: Mix magnesium hydroxide, dipropyl aluminum hypophosphite, attapulgite, and melamine polyphosphate in a certain proportion to form a mixture.

[0033] S3: Mix to obtain a mixture. Mix silane coupling agent, deionized water, and ethanol in a weight ratio of 2:(1.5-2.5):(1.5-2.5) to obtain a mixture.

[0034] S4: Mix to obtain a slurry. Mix the silicon micro powder, silicon nitride, magnesium oxide and water in a weight ratio of 1:(1-2) to make a slurry.

[0035] S5: Stirring, adding the mixture, liquid and slurry to the reaction vessel in proportion to prepare the flame retardant mixture;

[0036] S6: Drying and pulverizing, the flame retardant mixture is dried and pulverized to form flame retardant powder.

[0037] In this implementation plan, specifically in step one, the sieve mesh of the screening machine is set to 200-300 mesh.

[0038] In this implementation scheme, specifically in step five, the stirring temperature is set to 90℃-115℃, and the stirring speed is set to 300-800 r / min. If the overall particle size of the powder is 10-20 μm, the stirring speed is set to 300-500 r / min to ensure uniform mixing while minimizing wear on the material. If the overall particle size of the powder is 1-10 μm, the stirring speed is set to 500-800 r / min to break up agglomerated materials and ensure contact between the silane and the powder.

[0039] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solutions described in this invention, or by designing similar technical solutions by those skilled in the art under the inspiration of the technical solutions described in this invention, falls within the protection scope of this invention.

Claims

1. A nylon flame retardant, characterized in that, The composition, by weight, includes 30-50 parts magnesium hydroxide, 5-10 parts dipropyl aluminum hypophosphite, 10-15 parts attapulgite, 5-10 parts melamine polyphosphate, 2-3.5 parts silane coupling agent, 25-35 parts silica powder, 5-8 parts silicon nitride, and 10-17 parts magnesium oxide.

2. The nylon flame retardant as described in claim 1, characterized in that, The particle size of silicon micro powder is set at 2-15 μm, the particle size of silicon nitride is set at 3-15 μm, the particle size of magnesium oxide is set at 1-8 μm, and the particle size of magnesium hydroxide is set at 2-10 μm.

3. The nylon flame retardant as described in claim 1, characterized in that, The particle size of the attapulgite was set to 6-18 μm.

4. The nylon flame retardant as described in claim 1, characterized in that, The particle size of dipropyl aluminum hypophosphite was set to 3-18 μm, and the particle size of melamine polyphosphate was set to 10-30 μm.

5. The nylon flame retardant as described in claim 1, characterized in that, The difference between the particle size of silicon micropowder and the particle size of silicon nitride is less than 5 μm.

6. A method for preparing a nylon flame retardant, characterized in that, The preparation method of this nylon flame retardant includes the following steps: Step 1: Sieving. Magnesium hydroxide, dipropyl aluminum hypophosphite, attapulgite, melamine polyphosphate, silane coupling agent, silica powder, silicon nitride, and magnesium oxide are sieved through a 200-300 mesh sieve to avoid large particles from clumping. Step 2: Material mixing. Mix magnesium hydroxide, aluminum dipropyl phosphite, attapulgite, and melamine polyphosphate in a specific ratio to form a mixture. Step 3: Mix to obtain a mixture. Mix the silane coupling agent, deionized water, and ethanol in a weight ratio of 2:(1.5-2.5):(1.5-2.5) to obtain a mixture. Step 4: Mix to obtain a slurry. Mix the silicon micro powder, silicon nitride, magnesium oxide and water in a weight ratio of 1:(1-2) to make a slurry. Step 5: Stirring. Add the mixture, liquid, and slurry to the reaction vessel in proportion to prepare the flame retardant mixture. Step 6: Drying and pulverizing. The flame retardant mixture is dried and pulverized to form flame retardant powder.

7. The method for preparing the nylon flame retardant as described in claim 1, characterized in that, In step one, the sieve mesh of the screening machine is set to 200-300 mesh.

8. The method for preparing the nylon flame retardant as described in claim 1, characterized in that, In step five, the stirring temperature is set to 90℃-115℃, and the stirring speed is set to 300-800 r / min.

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