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A process for preparing flame-retardant composite materials by using starch-coated ammonium polyphosphate

A technology of coating ammonium polyphosphate and flame-retardant composite materials, which is applied in the field of flame-retardant composite materials, can solve problems such as lack of reports, achieve low cost, improve hydrophilicity, and improve dispersibility

Active Publication Date: 2021-09-28
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are currently few reports on

Method used

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Examples

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preparation example Construction

[0036] (4) Preparation of intumescent flame retardant system:

[0037] Weigh a certain amount of starch-coated ammonium polyphosphate as the acid source and carbon source, and ammonium salts as the gas source, and place them in a blast drying oven at 60-100°C for 3-8 hours, then press 2:1~ The mass ratio of 10:1 is evenly mixed for later use.

[0038] Preferably, the mass ratio of starch to polyamide is 1-2:4-5.

[0039] (5) Preparation of composite materials:

[0040]First, dry the thermoplastic in a blast drying oven at 60°C~100°C for 6h~12h for later use;

[0041] Next, add thermoplastics into the molding equipment at a temperature of 80-230°C. After the thermoplastics are melted, add the intumescent flame retardant obtained in step 2, and obtain a composite material after melt blending and molding. Thermoplastics can be completely melted at a temperature of 80-230°C.

[0042] In this embodiment, the starch is one or a mixture of corn starch, potato starch and tapioca s...

Embodiment 1

[0050] (1) Prepare cornstarch into a solution with a mass fraction of 3%, and heat it in a water bath at 95°C for 1 hour while stirring at 250rpm.

[0051] (2) Add a certain amount of ammonium polyphosphate into the starch solution after gelatinization, after stirring, add sodium oleate solution with a mass fraction of 2%, and heat the prepared mixed solution at 95°C for 30 minutes to promote starch and Sodium oleate forms clathrates.

[0052] In this embodiment, the amount of starch is 6g, and the amount of ammonium polyphosphate is 15g.

[0053] (3) After cooling the above solution to 25°C, add water to dilute to a solution with a mass fraction of 8%; then add 0.2mol / L calcium chloride solution and 2% octadecyltrimethoxysilane Linking agent, to induce starch / sodium oleate clathrate to be deposited on the ammonium polyphosphate, under 4000rpm, this suspension was centrifuged and washed 3 times to remove excess calcium ions, and freeze-dried to obtain starch-coated ammonium p...

Embodiment 2

[0060] (1) Potato starch was prepared into a solution with a mass fraction of 1%, and heated in a water bath at 85°C for 12 hours under stirring at 500 rpm.

[0061] (2) Add a certain amount of ammonium polyphosphate into the starch solution after gelatinization, after stirring, add sodium oleate solution with a mass fraction of 2%, and heat the prepared mixed solution at 95°C for 30 minutes to promote starch and Sodium oleate forms clathrates.

[0062] In the present embodiment, the starch is 3 g, and the ammonium polyphosphate is 15 g.

[0063] (3) After cooling the above solution to 25°C, add water to dilute to a solution with a mass fraction of 5%; then add 0.5mol / L calcium bromide solution and a titanate coupling agent with a mass fraction of 0.7% to induce The starch / sodium oleate clathrate was deposited on the ammonium polyphosphate, and the suspension was centrifuged and washed three times at 6000 rpm to remove excess calcium ions, and freeze-dried to obtain starch-co...

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Abstract

The invention relates to a process for preparing a flame-retardant composite material by using starch-coated ammonium polyphosphate, comprising the following steps: starch-coated ammonium polyphosphate: adding calcium ions and a coupling agent to the starch inclusion compound and stirring, then centrifugally washing Dry to obtain a mixture of starch-coated ammonium polyphosphate; preparation of intumescent flame retardant system: mix ammonium salt with a mixture of starch-coated ammonium polyphosphate to obtain an intumescent flame retardant system; preparation of flame retardant composite materials: after melting thermoplastics, put The flame retardant composite material is obtained after molding in the intumescent flame retardant system. The preparation process of the invention does not need to add harmful reagents, and the prepared flame retardant has excellent performance and is environmentally friendly. The method has wide and cheap raw material sources, low production cost and is suitable for wide application.

Description

technical field [0001] The invention relates to the field of flame-retardant composite materials, in particular to a new type of flame retardant prepared by using calcium ions to induce starch / sodium oleate inclusion compound to coat ammonium polyphosphate particles, and coupling treatment with a coupling agent, so as to prepare a flame-retardant composite material. Composite approach. Background technique [0002] With the rapid development of polymer materials, electronics, electrical appliances, machinery, automobiles, ships, aerospace and chemical industries, plastic products are more and more widely used in various fields of people's life and production. Especially the application of thermoplastic products has brought great convenience to people. Thermoplastic is a new type of organic polymer synthetic material with great application potential. Due to its good toughness, large damage tolerance, good dielectric constant, and unlimited storage period, no low temperature ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C08L67/04C08L23/06C08L23/12C08L69/00C08K9/10C08K3/32
CPCC08K3/32C08K9/10C08K2003/323C08L67/02C08L67/04C08L69/00C08L23/12C08L23/06
Inventor 岳小鹏李雨李超凡李坚李金宝
Owner SHAANXI UNIV OF SCI & TECH
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