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A kind of preparation method of ammonium polyphosphate/kaolin composite flame retardant

A composite flame retardant and ammonium polyphosphate technology, which is applied in the field of non-metallic mineral deep processing materials and halogen-free flame retardant materials, can solve the problem of unsatisfactory ammonium polyphosphate dialysis effect, difficult coating and microencapsulation, microencapsulation Surface damage and other problems, to achieve the effect of improving anti-dialysis performance, good processability, and low cost

Inactive Publication Date: 2018-01-09
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main problem of microencapsulation is that ammonium polyphosphate is an inorganic substance, which is not easy to be uniformly coated and microencapsulated by resin; at the same time, in the process of microencapsulation, if the ammonium polyphosphate particles are soaked in the water-based resin, local Hydrolysis reduces the degree of polymerization of APP, thereby increasing its water solubility; the treated APP is easy to agglomerate, and if it is crushed and depolymerized again, it is easy to damage some microencapsulated surfaces
Therefore, this modification treatment is not ideal for improving the dialysis performance of ammonium polyphosphate.

Method used

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  • A kind of preparation method of ammonium polyphosphate/kaolin composite flame retardant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take granularity D 97 Calcined 80g of ultrafine water-washed kaolin <10μm in a muffle furnace at 800°C for 1.5h to obtain calcined kaolin; take 200g of ammonium polyphosphate and modify its surface with 30g of melamine at 200°C for 1.5h , to obtain modified ammonium polyphosphate; after uniformly mixing 50 g of calcined kaolin and 150 g of modified ammonium polyphosphate, 3 g of simethicone oil was added at 105 ° C for surface modification, and the modification time was 30 minutes to obtain ammonium polyphosphate / Kaolin composite flame retardant.

[0017] Add the prepared ammonium polyphosphate / kaolin composite flame retardant to EVA cable material to make a sample of flame retardant sheath material. The formula is: 45 parts of composite flame retardant, 50 parts of EVA, antioxidant, compatibilizer, lubricant There are 5 parts of agent and color masterbatch. According to the following methods and standards, the dialysis rate and oxygen index change rate performance i...

Embodiment 2

[0027] Take granularity D 97 60g of ultra-fine water-washed kaolin <10μm was calcined in a muffle furnace at 900°C for 1h to obtain calcined kaolin; take 200g of ammonium polyphosphate and modify its surface with 10g of melamine at 150°C for 1.5h. Obtain modified ammonium polyphosphate; after uniformly mixing 40 g of calcined kaolin and 160 g of modified ammonium polyphosphate, add 4 g of hydroxyl silicone oil at 120° C. Fuel.

[0028]The preparation and performance measurement methods of the flame retardant sheath material samples are the same as in Example 1.

[0029] The test results of the performance indicators of the dialysis rate and oxygen index change rate of the sheath material samples are listed in Table 1.

Embodiment 3

[0031] Take granularity D 97 50g of ultra-fine water-washed kaolin <10μm was calcined in a muffle furnace at 600°C for 1.5h to obtain calcined kaolin; take 200g of ammonium polyphosphate and modify its surface with 40g of melamine at 120°C for 1h. Obtain modified ammonium polyphosphate; after uniformly mixing 25g of calcined kaolin and 125g of modified ammonium polyphosphate, add 3g of γ-methacryloxypropyltrimethoxysilane at 80°C for surface modification, and the modification time 30min, the ammonium polyphosphate / kaolin composite flame retardant was prepared.

[0032] The preparation and performance measurement methods of the flame retardant sheath material samples are the same as in Example 1.

[0033] The test results of the performance indicators of the dialysis rate and the oxygen index change rate of the sheath material samples are listed in Table 1.

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Abstract

The invention discloses a method for preparing an ammonium polyphosphate / kaolin composite flame retardant. The specific process steps are: (1) calcining ultrafine water-washed kaolin at 600-900°C for 1-2 hours to obtain calcined kaolin; (2) using Carry out surface modification to ammonium polyphosphate with melamine, modification temperature 100~250 ℃, modification time 1~2h, the consumption of melamine is 5%~25% of ammonium polyphosphate mass, obtains modified ammonium polyphosphate; (3) Mix calcined kaolin and modified ammonium polyphosphate at a mass ratio of 1:2~6, and then use a modifier to carry out composite surface modification. The modification temperature is 60~120°C, and the modification time is 15~60min. The dosage is 0.5%-3% of the total mass of calcined kaolin and modified ammonium polyphosphate to obtain ammonium polyphosphate / kaolin composite flame retardant. The invention can significantly reduce the water solubility and hygroscopicity of the ammonium polyphosphate, and improve the anti-dialysis performance of the ammonium polyphosphate filled polymer material products.

Description

technical field [0001] The invention relates to a preparation method of an ammonium polyphosphate / kaolin composite flame retardant, and belongs to the fields of non-metallic mineral deep processing materials and halogen-free flame retardant materials. Background technique [0002] At present, the development of flame retardants in the world shows the trend of non-halogenated, compound, harmless or low-harm and low-smoke. Ammonium polyphosphate (APP) is an excellent flame retardant. The phosphorus content and nitrogen content of ammonium polyphosphate are very high, and there is a P-N synergistic effect between them, which has high flame retardant performance and good thermal stability (decomposition temperature is higher than 250°C, and it is completely broken at about 750°C. Decomposition), low solubility in water, low smoke emission, low toxicity (LD50>10g / kg), the product is nearly neutral, and can be compounded with many other flame retardants to improve the flame re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K9/06C08K9/04C08K3/32C08K3/34C08L23/08
Inventor 郑水林陈洋杜鑫叶鹏
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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