Production method of high-transparency PMMA-PU gradient composite plate
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
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
View PDF4 Cites 2 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
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...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Property
Measurement
Unit
thickness
aaaaa
aaaaa
thickness
aaaaa
aaaaa
transparency
aaaaa
aaaaa
Login to view more
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more