Macromolecular organic silicon modifier as well as preparation method and application thereof in surface treatment of hydroxide flame retardant

A hydroxide and surface treatment technology, applied in the direction of dyeing organosilicon compound treatment, fibrous filler, etc., can solve the problems of little improvement effect of interface bonding force, short molecular chain, limited modification effect, etc., and achieve easy popularization and application. , low cost and controllable response

Inactive Publication Date: 2012-11-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although small-molecule modifiers can improve the interfacial compatibility between hydroxide particles and organic silicon materials, because the molecular chains of small molecules are very short, they can only change the surface properties of hydroxide particles. The interfacial bonding force between silicon materials has little improvement effect, and the modification effect is often very limited

Method used

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  • Macromolecular organic silicon modifier as well as preparation method and application thereof in surface treatment of hydroxide flame retardant
  • Macromolecular organic silicon modifier as well as preparation method and application thereof in surface treatment of hydroxide flame retardant
  • Macromolecular organic silicon modifier as well as preparation method and application thereof in surface treatment of hydroxide flame retardant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] First, 17.1 g of vinyltriethoxysilane, 0.01 g of platinum catalyst and 50 mL of toluene were added into a 200 mL four-necked flask, and heated to 130 °C under nitrogen protection. Then, 30 g of hydrogen-containing polysiloxane with a mass fraction of hydrogen of 0.3% was slowly added dropwise into the mixed solution using a constant-pressure dropping funnel, and stirred for 12 hours. After the reaction was complete, toluene and unreacted vinyltriethoxysilane were distilled off under reduced pressure to obtain a transparent product. Wash 5 times with methanol, remove the supernatant, spin out methanol, obtain the purified macromolecular silicone modifier, figure 1 As a silicone macromolecule modifier 1 H-NMR spectrum.

[0040] Disperse 40g of aluminum hydroxide into a mixed solution of 200mL of absolute ethanol and water (the mass ratio of absolute ethanol to water is 9:1), ultrasonically disperse for 1h, add 2g of macromolecular organic Silicon modifier, react at 80°...

Embodiment 2

[0043] This example is the same as Example 1 except for the following features: 60g of aluminum hydroxide is dispersed into a mixed solution of 300mL of absolute ethanol and water, and 3g of a macromolecular organosilicon modifier after hydrolysis at pH=3 for 1h is added, After the reaction, modified aluminum hydroxide is obtained. Adding the modified aluminum hydroxide to the silicone rubber can produce a tensile strength of 5.04MPa, a tear strength of 24.2kN / m, a breaking elongation of 250%, a Shore hardness of 51, and an oxygen index of 35.3. % flame retardant silicone rubber.

[0044] Using the same characteristics as the above examples, when the commonly used silane coupling agent A-151 is used as a modifier, the tensile strength of the silicone rubber obtained with the same formula is 4.83MPa, the tear strength is 23.3kN / m, The elongation at break is 220%, the Shore hardness is 51, and the oxygen index is 35.0%.

Embodiment 3

[0046] This example is the same as Example 1 except for the following features: 80g of aluminum hydroxide is dispersed into a mixed solution of 400mL of absolute ethanol and water, and 4g of a macromolecular organosilicon modifier after hydrolysis at pH=3 for 1h is added, After the reaction, modified aluminum hydroxide is obtained. Adding the modified aluminum hydroxide to the silicone rubber can produce a tensile strength of 4.91MPa, a tear strength of 21.7kN / m, a breaking elongation of 240%, a Shore hardness of 55, and an oxygen index of 37.5. % flame retardant silicone rubber.

[0047] Using the same characteristics as the above examples, when the commonly used silane coupling agent A-151 is used as a modifier, the silicone rubber obtained with the same formula has a tensile strength of 4.58MPa, a tear strength of 21.6kN / m, and a fracture strength of 21.6kN / m. The elongation is 200%, the Shore hardness is 55, and the oxygen index is 37.3%.

[0048] From the results of sev...

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Abstract

The invention relates to a macromolecular organic silicon modifier and a preparation method and application thereof in surface treatment of a hydroxide flame retardant. According to the preparation method, hydrogen polysiloxane and vinyl-containing unsaturated siloxane are used as raw materials, platinum complex is used as a catalyst, and the macromolecular organic silicon modifier is synthesized by adopting hydrosilylation reaction; and the prepared macromolecular organic silicon modifier has a good modification effect on the hydroxide flame retardant, and can be used for effectively improving the hydrophobic property of the surface of a hydroxide in the surface treatment of the hydroxide flame retardant. The contact angle between the modified hydroxide powder and water can reach over 120 degrees and has high compatibility with an organic silicon material, and the mechanical property of an organic silicon material filled with the hydroxide flame retardant can be improved. The raw materials are readily available, the synthetic process is simple, the modification method is convenient and high in adaptability, and the modification effect is superior to that of a common silane coupling agent.

Description

technical field [0001] The invention relates to the technical field of organosilicon materials, in particular to an organosilicon macromolecule modifier, a preparation method thereof, and an application in the surface treatment of a hydroxide flame retardant. Background technique [0002] Inorganic hydroxide as a high polymer flame retardant has triple effects of smoke suppression, flame retardancy, filling and reinforcement, and is non-toxic, does not produce corrosive gas during combustion, and has no secondary pollution; the source of raw materials is wide and the price is low. However, hydroxide particles are a kind of inorganic compounds with strong polarity. The surface of the particles is charged and has hydrophilicity; the specific surface area of ​​the particles is large, the surface energy is high, and it is easy to re-agglomerate; it is compatible with organic silicon materials. It is difficult to form a good interfacial bond. At the same time, the interface betw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/38C09C3/12C09C1/40C09C1/02C08K9/06C08K3/22
Inventor 童真郭鹏任碧野刘新星
Owner SOUTH CHINA UNIV OF TECH
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