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Shape memory phenolic foam and preparation method thereof

A phenolic foam and memory technology, applied in the field of shape memory polymer synthesis, can solve the problems of no shape memory performance, poor mechanical properties of phenolic resin, high brittleness, etc., and achieve high shape fixation rate, high shape recovery rate, and shape recovery rate The effect of speed and deformation ability improvement

Pending Publication Date: 2022-07-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with other foam materials, phenolic foam has excellent flame retardant properties, but because of its molecular chain contains more rigid benzene ring structures, resulting in poor mechanical properties of phenolic resin, such as high brittleness, poor toughness, no impact resistance, and Ordinary phenolic foam does not have shape memory properties, which limits the further development of phenolic resins

Method used

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  • Shape memory phenolic foam and preparation method thereof
  • Shape memory phenolic foam and preparation method thereof
  • Shape memory phenolic foam and preparation method thereof

Examples

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preparation example Construction

[0059] Another embodiment of the present invention provides the above-mentioned preparation method of shape memory phenolic foam, comprising the following steps:

[0060] S1, add diisocyanate to the resole phenolic resin, and mix uniformly to obtain solution one;

[0061] S2, add solidifying agent and foaming agent successively in described solution one, mix homogeneously, obtain solution two;

[0062] S3, remove the impurity in described solution two, then add surfactant, mix homogeneously, obtain solution three;

[0063] S4. Pour the solution 3 into a preheated mold, heat and solidify, and then demold to obtain a shape memory phenolic foam.

[0064] The preparation method of the shape-memory phenolic foam has the same advantages as the above-mentioned shape-memory phenolic foam relative to the prior art, which is not repeated here. In addition, the preparation method of the shape-memory phenolic foam provided by the present invention has simple process and easy-to-obtain r...

Embodiment 1

[0070] A shape memory phenolic foam, comprising 100 parts of resole phenolic resin, 15-30 parts of hexamethylene diisocyanate toughening agent, 10 parts of phosphoric acid curing agent, 5 parts of isopentane foaming agent, polysorbate-80 surface 8 servings of active agent. Under the aforementioned material ratio, the mass fraction of the toughening agent was adjusted to 15 parts, 20 parts, 25 parts, and 30 parts respectively, and the prepared shape memory phenolic foams were named as SMPF-a, SMPF-b, SMPF-c and SMPF-c. SMPF-d.

[0071] The preparation method of above-mentioned shape memory phenolic foam, comprises the steps:

[0072] S1, add diisocyanate to the resole phenolic resin, and mix uniformly to obtain solution one;

[0073] Wherein, the preparation method of the resole phenolic resin includes: drying the resole phenolic solution in a vacuum drying oven at 60° C. for 40 minutes, and removing impurities such as water and a small amount of ethanol in the resole phenoli...

Embodiment 2

[0080]A shape memory phenolic foam, comprising 100 parts of resole phenolic resin, 30 parts of diphenylmethane diisocyanate as a toughening agent, 10 parts of p-toluenesulfonic acid curing agent, 6 parts of n-hexane foaming agent, polysorbate-80 10 parts of surfactant; the preparation method is basically the same as that of Example 1, except that solution 3 is poured into molds preheated to 75°C, 80°C, 85°C, and 90°C for subsequent curing reaction, and the prepared shape The memory phenolic foams were named SMPF1, SMPF2, SMPF3 and SMPF4 in turn.

[0081] image 3 The scanning electron microscope image of the shape memory phenolic foam prepared in this example is shown, wherein from left to right, a is SMPF1, b is SMPF2, c is SMPF3, and d is SMPF4. As can be seen from the figure, SMPF1 has a cell diameter of 140-190 μm, SMPF2 has a cell diameter of 170-260 μm, SMPF3 has a cell diameter of 240-310 μm, and SMPF4 has a cell diameter of 290-420 μm. In this example, the control of...

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Abstract

The invention provides shape memory phenolic foam and a preparation method thereof, and belongs to the technical field of shape memory polymer synthesis. The shape memory phenolic foam comprises the following components in parts by weight: 100 parts of A-stage phenolic resin, 10-30 parts of a toughening agent, 1-15 parts of a curing agent, 5-10 parts of a foaming agent and 5-10 parts of a surfactant, the toughening agent is prepared from diisocyanate. A long flexible chain is introduced to a benzene ring structure of resole phenolic aldehyde, so that the flexibility of a phenolic aldehyde structure is improved, the distance between cross-linking points in the shape memory phenolic foam is increased, and the molecular structure of the shape memory phenolic foam has two molecular chain segment structures, namely a hard segment and a soft segment; the soft section and the hard section (benzene ring) are matched, so that the phenolic foam has shape memory performance, the deformability is improved, the shape recovery rate is high, and the shape fixation rate and the shape recovery rate are high.

Description

technical field [0001] The invention relates to the technical field of shape memory polymer synthesis, in particular to a shape memory phenolic foam and a preparation method thereof. Background technique [0002] Shape Memory Polymers (SMPs), a branch of smart materials, provide a new solution to complex engineering problems. Due to the characteristics of various driving methods, low cost, easy processing and biocompatibility, shape memory polymers have a wide range of applications in multiple disciplines and fields, such as variant aircraft, smart fabrics, smart medical devices, and minimally invasive surgical implants. materials, heat shrinkable tubes for packaging electronic components, etc. [0003] Shape memory polymer foam (Shape Memory Polymer Foam) is a polymer with a porous structure obtained by foaming a shape memory polymer as a matrix material. It has the characteristics of low density, light weight and shape memory effect. It is a new type of foam. The develop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L61/06C08L71/02C08K5/29C08J9/14
CPCC08J9/141C08J9/0028C08J9/0061C08J2361/06C08J2471/02
Inventor 冷劲松胡利凯张风华刘彦菊
Owner HARBIN INST OF TECH
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