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Production method of high-transparency PMMA-PU gradient composite plate

A high-transparency, composite board technology, applied in the field of composite materials, to achieve the effect of increasing the diffusion depth and increasing the diffusion rate

Inactive Publication Date: 2017-05-31
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This gradient structure is between the layered structure and the network structure. Through the component gradient, the refractive index gradient is established, which solves the problem of light attenuation caused by the interface light scattering of the laminated material and the microphase separation of the polymer matrix composite material, thereby Obtain high transparency PMMA / PU gradient material

Method used

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  • Production method of high-transparency PMMA-PU gradient composite plate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Prepare 100 g of PMMA monomer solution, take 94.5 g of MMA monomer, add 5.0 g of cross-linking agent TMPTMA and 0.5 g of initiator AIBN, mechanically stir for 30 min, vacuum degas, and set aside.

[0028] Prepare 100 g of PU monomer solution, take 34.8 g of isophorone diisocyanate IPDI, add 56.8 g of polypropylene glycol PPG, 7.7 g of chain extender BDO and 0.7 g of catalyst DBTDL, mechanically stir for 30 min, vacuum degas, and set aside.

[0029] Pour the PU monomer solution into a stainless steel mold, pre-polymerize at 55 °C for 2 hours, then pour the PMMA monomer solution, apply a pressure of 20 MPa through the upper mold head, and place it on a heating platform to raise the temperature step by step. The temperature difference between the upper pressure head The temperature was 15 ℃, and the sequential polymerization process was 60 ℃ and constant temperature for 20 h, the temperature was raised to 70 ℃ and constant temperature for 15 h, the temperature was raised to...

Embodiment 2

[0032] The monomer solution preparation of PMMA and PU is identical with embodiment 1. Pour the PU monomer solution into a stainless steel mold, pre-polymerize at 50 °C for 0.5 h, then pour the PMMA monomer solution, apply a pressure of 80 MPa through the upper pressure head of the mold, and place it on a heating platform to raise the temperature step by step. The temperature difference between the indenters The temperature was 5 °C, and the sequential polymerization process was 60 °C for 20 h, then 70 °C for 15 h, 80 °C for 10 h, and 95 °C for 4 h. After the reaction, the sample was taken out and placed in a vacuum oven for 48 h to obtain a transparent PMMA / PU gradient composite plate with a thickness of 5.4 mm.

[0033] The gradient composite board is rough-ground and fine-ground with 250-mesh and 2000-mesh emery paper, and the surface is polished with an abrasive paste prepared from ultra-fine silica powder and liquid paraffin. Using a polarizing microscope to observe th...

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Abstract

The invention discloses a production method of a high-transparency PMMA-PU gradient composite plate and belongs to the field of composites. The method comprises the following steps: (1) taking aliphatic isocyanate and polyether polyol as the raw materials and producing polyurethane (PU) prepolymer in a stainless steel mould; (2) uniformly mixing polymethyl methacrylate monomers (MMA), initiators and cross-linking agents, and adding the mixture into the PU prepolymer mould, applying pressure to an MMA monomer solution and the PU prepolymer via an upper pressing head of the mould to enable the MMA monomer solution to be diffused and permeated into the PU prepolymer to form a compositional gradient structure; and (3) controlling the temperature of a heating platform by using a gradient temperature increasing manner and building a temperature gradient field between the bottom of the mould and the upper pressing head to produce the high-transparency PMMA-PU gradient composite plate. The gradient composite plate has the characteristics of high transparency, high strength, impact resistance and heat stability and has potential application prospects in aviation transparent parts and bullet-proof transparent windows.

Description

technical field [0001] The invention relates to a preparation method of a PMMA-PU gradient composite board, in particular to a preparation method of a high-transparency PMMA-PU gradient composite board under the action of a pressure and temperature gradient field, and belongs to the field of composite materials. Background technique [0002] Polymer gradient materials can be regarded as composed of countless successively superimposed thin layers, with no obvious interface between layers, and the composition, structure and physical and chemical properties of each thin layer gradually transition from one side to the other, presenting a gradient distribution . Polymer gradient materials are usually composites of two polymers, the first polymer (the host) swells in the monomer of the second polymer (the guest), and the swelling of the monomer ends before reaching an equilibrium state, Re-polymerization forms a guest network. The composition and structure of this composite mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/08C08L33/12C08F220/14C08F222/14C08G18/66C08G18/48C08G18/10C08G18/32
CPCC08F220/14C08G18/10C08G18/4825C08G18/6674C08L33/12C08L75/08C08L2201/10C08G18/3206C08F222/103
Inventor 卢金山丛欣泉李喜宝冯志军
Owner NANCHANG HANGKONG UNIVERSITY
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