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Method for preparing IPN structure PMMA-PU high-transparency composite board through ultrasonic assistance

A high-transparency, ultrasonic-assisted technology, applied in the field of composite materials, can solve the problem of poor light transmission of plates

Inactive Publication Date: 2017-04-26
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Heim et al. prepared a PMMA cast plate reinforced with a small amount of PU (less than 10%) by synchronous polymerization. The transparency of the plate is opposite to the change trend of impact properties, but they are all related to the size of PMMA nodes, which depends on the dissolution of MMA at the beginning of polymerization. When the cross-link density of the PU network is increased, the light transmittance of the sheet is poor when the PMMA node size exceeds 1 micron ( High impact cast sheets of poly(methyl methacrylate) with low levels of polyurethane[J], Polymer, 1993; 34(8): 1653- 1660 )

Method used

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  • Method for preparing IPN structure PMMA-PU high-transparency composite board through ultrasonic assistance
  • Method for preparing IPN structure PMMA-PU high-transparency composite board through ultrasonic assistance

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, stir mechanically for 5 min, 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, stir mechanically for 5 min, and set aside.

[0029] Use 250-mesh and 2000-mesh emery paper to coarsely grind and finely grind the sample, and use liquid paraffin and ultrafine silica powder to prepare an abrasive paste, and polish it on the surface of the flannelette to obtain a transparent glass with a thickness of about 3.5 mm. Composite panels, such as figure 2 shown. The optical performance of the composite board was tested by a photoelectric haze meter, and its transparency was 91.6%.

Embodiment 2

[0031] The PMMA and PU monomer solution in Example 1 are mechanically mixed, vacuum degassed, poured into a polytetrafluoroethylene mold, and the mixed solution is sealed by the upper pressure head of the mold, applying a constant pressure P=120 MPa, 50 degrees Celsius Under prepolymerization for 2 h. The mold was immersed in the water in the temperature-regulated low-frequency ultrasonic container, the water temperature was 60 degrees Celsius, the temperature was kept at 5 h, the temperature was raised to 70 degrees Celsius for 5 hours, the temperature was raised to 80 degrees Celsius for 5 hours, the temperature was raised to 95 degrees Celsius for 2 hours, and the PMMA with IPN structure was prepared. -PU transparent composite board.

[0032]Use 250-mesh and 2000-mesh emery paper to coarsely grind and finely grind the sample, and use liquid paraffin and ultrafine silica powder to prepare an abrasive paste, and polish it on the surface of the flannelette to obtain a transpar...

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Abstract

The invention discloses a method for preparing an IPN structure PMMA-PU high-transparency composite board through ultrasonic assistance, and belongs to the field of composites. The method comprises the following steps that 1, raw materials (monomers, an initiator / catalyst, a cross-linking agent, a chain extender and the like) of polymethyl methacrylate (PMMA) and polyurethane (PU) are mechanically mixed to be uniform, and the materials are poured into a polytetrafluoroethylene mold after being subjected to vacuum degassing; 2, a sealing pressing head is placed on the mold to apply constant pressure; 3, the mold is placed in a temperature-adjustable low-frequency ultrasonic container, a sequential polymerization reaction is carried out under the action of ultrasonic waves, and the high-transparency interpenetrating polymer network (IPN) structure PMMA-PU composite board is prepared. The action of ultrasonic assistance is adopted, and the prepared IPN structure PMMA-PU composite board has the advantages of being low in microphase separation degree, high in transparency and the like and is expected to be applied to light bulletproof transparent materials.

Description

technical field [0001] The invention relates to a preparation method of a PMMA-PU transparent composite board with an IPN structure, in particular to a preparation method of a PMMA-PU high-transparency composite board under the assisted action of ultrasound, and belongs to the field of composite materials. Background technique [0002] Interpenetrating network (IPN) structure polymer is a blend of two or more polymers, different polymer networks interpenetrate each other, and at least one polymer molecular chain is cross-linked by chemical bonds to form a network structure composite material. IPN structural composites can form a uniform whole on a macro scale through two or more polymers with different physical and chemical properties through an interlaced network, and can achieve optimal combinations in terms of mechanical, electrical, thermal, and optical properties. Widely used in engineering plastics, coatings, biomedical materials, damping materials and other fields (CN...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/12C08L75/08C08G18/66C08G18/48C08G18/32
CPCC08G18/3206C08G18/4825C08G18/6674C08L33/12C08L2201/10C08L2205/04C08L75/08
Inventor 丛欣泉卢金山冯志军李喜宝
Owner NANCHANG HANGKONG UNIVERSITY
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