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A technology of epoxy resin and foaming materials, applied in the field of polymer materials, can solve the problems of high cost, complicated operation, difficult large-scale production, etc., and achieve the effect of dense cells and uniform structure
Inactive Publication Date: 2011-04-27
SHANGHAI INST OF TECH +1
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Problems solved by technology
However, the above three reaction methods all have problems such as complex operation, uneven stirring, high cost, generation of toxic gas, difficult to control product morphology, etc., making it difficult to scale production
So far, there have been no research reports on the synergistic process of foaming and curing of epoxy resin-based foam materials in China.
Method used
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Embodiment 1
[0019] (1) Weigh the mixture of bisphenol A type epoxy resin, azobisisobutyronitrile, Tween-80, light calcium carbonate and talcum powder at 600~ Mix evenly under high-speed stirring at 1000 rpm;
[0020] (2) Preheat the mixture in step (1) in an oven at 75°C for 0.5 hours, take it out, and cool it to 30°C;
[0021] (3) Add a triethylenetetramine curing agent with an epoxy resin mass fraction of 10% to the mixture obtained in step (2), and stir at a high speed of 600 to 1000 rpm until uniformly mixed;
[0022] (4) Put the mixture in step (3) into a stainless steel mold, heat at 75°C for 1 hour, take it out after cooling to room temperature, and obtain the product of the present invention.
[0023] The product obtained in Example 1 was characterized by the morphology, strength, and expansion ratio of the product by an electronic universal testing machine, etc. 2.7. Composition of closed cells with a pore diameter of ~0.1mm; the bending and compressive strengths of the materia...
Embodiment 2
[0025] In the step (2), the cooling temperature is changed to 25 DEG C. In the step (3), the addition of triethylenetetramine is 25% of the mass fraction of the epoxy resin. Other conditions and steps are exactly the same as in Example 1, and the resulting The foam material is composed of closed cells with uniform foam density, expansion ratio ~ 2.4, and pore diameter ~ 0.05mm. The bending and compressive strengths of the material are 10.69N / cm 2 and 3.76N / cm 2 .
Embodiment 3
[0027] In step (2), the cooling temperature was changed to 20°C. In step (3), triethylenetetramine was replaced with diethylenetriamine as the curing agent. Other conditions and steps were exactly the same as in Example 1. The resulting foamed material was made of foam It is composed of closed cells with uniform density, expansion ratio ~ 2.2, and pore diameter ~ 0.06mm. The bending and compressive strength of the material are 10.5N / cm respectively. 2 and 3.65N / cm 2 .
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Abstract
The invention discloses a method for preparing an epoxide resin foaming material. The method comprises the following steps that: 1. according to the mass ratio, epoxide resins, foaming agents, foam stabilizing agents and addition agents are respectively picked up and evenly mixed with high-speed stirring; 2. the mixture obtained is put in an oven with a temperature of between 40 and 80 DEG C and pre-heated for 0.5 to 1 hour, and the mixture is taken out and cooled down to a temperature of between 25 and 35 DEG C; 3. The mixture is added with curing agents and evenly mixed; 4. the mixture is put in a stainless steel mold and heated at the temperature of between 40 to 80 DEG C for 0.5 to 2 hours, and the mixture is cooled down to the room temperature and taken out, and finally the finished products are obtained. By controlling reaction conditions, the invention realizes the association control of the chemical foaming and the curing molding of epoxy, and the foaming multiplying factor isas high as 2.7, and products prepared by the method are good in water resistance, chemical corrosion resistance and strength. The method of the invention has the advantages of easy buying of materials, simple operation and easy industrialization, and provides a new path for preparing thermosetting foaming materials.
Description
technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of an epoxy resin-based foaming material. Background technique [0002] Due to its low apparent density, light weight and tough structure, epoxy foam has better mechanical properties, electrical properties, water resistance and chemical corrosion resistance and higher corrosion resistance than traditional polyurethane and polystyrene foam plastics. Thermal stability, etc., have broad application prospects in industries such as automobiles, aerospace, biology, electronics, marine products, coatings, and medicine, which has attracted people's attention. However, due to the dense structure, dense cells and certain mechanical strength of epoxy resin-based foaming materials, the synergistic effect of foaming and curing processes is required, that is, the simultaneous progress of foaming and curing processes, which greatly increases its foamin...
Claims
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Application Information
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