Lightweight and high-strength high-molecular material and preparation method thereof

A polymer material and high-strength technology, applied in the field of lightweight materials, can solve the problems of affecting mechanical properties, dimensional stability and stability of mechanical properties, and limited mechanical properties of materials, so as to achieve uniform pore distribution and simple and green preparation process Effect

Active Publication Date: 2019-09-13
SHAANXI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Based on the preparation process of the above-mentioned lightweight materials, the research group of the present invention has developed a method for preparing lightweight high-strength polymer materials by the soft template method (Polymerizable Nonconventional Gel Emulsions and Their Utilization in the Template Preparation of Low-Density, High-Strength Polymeric Monoliths and 3D Printing. Macromolecules, 2019, 52, 2456-2463.), hereinafter referred to as comparative literature, although this method can regulate its density in a wide range, but the crosslinking agent used in this preparation method is a rigid crosslinking agent, resulting in The mechanical properties of the material are limited, and the surface-active n-octyltriethoxysilane is added to the formula of this reference, which reduces the interfacial tension of the gel emulsion system, resulting in a basically open-pore structure of the material, which affects its mechanical properties
In addition, due to the high water absorption rate due to the open pore structure, the dimensional stability and mechanical property stability decrease, which limits its development in many application fields.

Method used

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  • Lightweight and high-strength high-molecular material and preparation method thereof
  • Lightweight and high-strength high-molecular material and preparation method thereof
  • Lightweight and high-strength high-molecular material and preparation method thereof

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preparation example Construction

[0050] Its preparation method comprises the following steps:

[0051] 1. Preparation of soft template

[0052] Under normal temperature and pressure, add a certain amount of gelling agent, oil phase reactive monomer, oil phase crosslinking agent and initiator into a suitable container, stir and shake evenly, and then add the dispersed phase to emulsify to form a uniform, fine, inverted No runny gel lotion. Wherein the volume ratio of continuous phase and dispersed phase is (8.5~1.5):(1.5~8.5);

[0053] Alternatively, add the gelling agent, oil phase prepolymer and curing agent into a suitable container, stir and oscillate evenly, and then add the dispersed phase for emulsification to form a uniform, delicate, inverted and non-flowing gel emulsion. Wherein the volume ratio of continuous phase and dispersed phase is (8.5~1.5):(1.5~8.5);

[0054] Alternatively, add the gelling agent, oil phase reactant, oil phase crosslinking agent, initiator and curing agent into a suitable c...

Embodiment 1

[0058] Add 2.75 mg of dicholesterol derivatives, 550 μL of styrene, 27.5 μL of tripropenyl isocyanurate, 82.5 μL of hexanediol diacrylate and 2.75 mg of azobisisobutyronitrile into the test tube, shake evenly on a shaker, Add 3740 μL of water and oscillate on a vortex shaker to form a uniform, inverted and non-flowing milky white gel emulsion system. Seal the test tube opening with the gel emulsion system, react in a water bath at 30°C for 12 hours, and warm at 60°C. Dry in an oven for 24 hours to obtain a density of 0.15±0.01g / cm 3 of lightweight polystyrene. The compression strength of this lightweight polystyrene is 3MPa, the compression modulus is 75MPa, the flexural strength is 3.5MPa, the flexural modulus is 130MPa, and the shear strength is 2.3 MPa.

Embodiment 2

[0060] Add 220 mg of sodium lauryl sulfate, 550 μL of styrene, 55 μL of methyl methacrylate, 18.2 μL of pentaerythritol tetraacrylate, 60.5 μL of tripropenyl isocyanurate, and 12.1 mg of azobisisobutyronitrile into the test tube. Shake evenly on the oscillator, add 5245 μL of sodium bicarbonate aqueous solution with a pH value of 10 and shake on the vortex shaker to form a uniform milky white gel emulsion system that is inverted and does not flow, and seal the test tube mouth with the gel emulsion system , reacted in a water bath at 60°C for 6h, dried in a warm oven at 50°C for 24h, and obtained a density of 0.15±0.01g / cm 3 A lightweight polystyrene-methyl methacrylate copolymer. The compressive strength of this lightweight high-strength material is 2.7MPa, the compressive modulus is 58MPa, the flexural strength is 3.4MPa, the flexural modulus is 130MPa, and the shear strength is 2.3MPa.

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Abstract

The invention provides a lightweight and high-strength high-molecular material and a preparation method thereof. The preparation system of the material comprises a continuous phase and a dispersion phase; and the continuous phase comprises a gelling agent and an oil phase reactant, and does not include n-octyltriethoxysiloxane, wherein the oil phase reactant is one or more of styrene, methyl methacrylate, an epoxy resin prepolymer and a polyurethane prepolymer. N-octylsiloxane is avoided, so 95% or more of the prepared material is a closed-cell structure, the water absorption rate is small, the heat insulation performance is good, and the mechanical properties and the heat insulation performance of the material are improved.

Description

technical field [0001] The invention belongs to the technical field of lightweight materials, and relates to a lightweight high-strength polymer material and a preparation method thereof. Background technique [0002] With the rapid development of new materials and their technologies, "energy saving, light weight, and environmental protection" have become important goals for the development of new materials today. In line with the requirements of technological development, a variety of high-performance lightweight materials have emerged one after another, and are widely used in aerospace, marine ships, wind power, radar, transportation and high-end sporting goods and other fields. At present, light materials with better comprehensive performance mainly include PMI foam, PVC foam, PET foam and solid buoyancy materials. Foam materials on the market are all produced by physical or chemical foaming methods. Due to the influence of foaming process and raw materials, the density ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F226/06C08F222/14C08F220/14C08F2/44C08K3/22C08K3/36C08K5/41C08K5/42
CPCC08F212/08C08F2/44C08K3/22C08K3/36C08K5/41C08K5/42C08K2201/011C08K2003/2275C08K2003/2241C08K2003/2296
Inventor 房喻王佩何怡楠刘姣姣
Owner SHAANXI NORMAL UNIV
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