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Preparation method of organic montmorillonite-modified polyvinyl formal sponge
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A polyvinyl formal and montmorillonite technology, which is applied in the field of polymer composite materials, can solve the problems that starch is difficult to clean, limit the scope of application, starch is prone to mildew, etc., achieves a simple and feasible preparation process, and improves mechanical properties and durability. Good results
Active Publication Date: 2015-12-23
WUHAN INSTITUTE OF TECHNOLOGY +1
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Problems solved by technology
[0003] In the currently published patents, the method of filling and foaming with starch is achieved. The products produced by this technology are difficult to clean the starch completely, and the residual starch is easy to mold and lead to product deterioration, which limits the scope of application.
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Embodiment 1
[0025] 1) Mix organically modified montmorillonite, polyvinyl alcohol and deionized water evenly, raise the temperature to 90°C, continue stirring to dissolve them all, and cool down to 25°C;
[0026] 2) Add formaldehyde, sodium lauryl sulfate and 40wt% sulfuric acid solution, and stir for 10 minutes;
[0027] 3) Add sodiumbicarbonate and mix evenly, pour into the mold, raise the temperature to 50° C. and keep it for 3 hours to obtain the product.
[0028] The amount of raw materials used is 100 parts of deionized water; 1 part of organically modified montmorillonite, 10 parts of polyvinyl alcohol, 5 parts of formaldehyde, 0.5 parts of foaming agent, 1 part of pore-forming agent and 7 parts of catalyst.
Embodiment 2
[0030] 1) Mix organically modified montmorillonite, polyvinyl alcohol and deionized water evenly, heat up to 90°C, continue stirring to dissolve them all, and cool down to 30°C;
[0031] 2) Add formaldehyde, sodium lauryl sulfate and 50wt% sulfuric acid solution, and stir for 15 minutes;
[0032] 3) Add sodium bicarbonate and mix evenly, pour into the mold, raise the temperature to 60°C and keep it warm for 4.5h to obtain the product.
[0033] The amount of raw materials used is 100 parts of deionized water; 3 parts of organically modified montmorillonite, 10 parts of polyvinyl alcohol, 7.5 parts of formaldehyde, 1 part of foaming agent, 2 parts of pore-forming agent and 15 parts of catalyst.
Embodiment 3
[0035] 1) Mix organically modified montmorillonite, polyvinyl alcohol and deionized water evenly, heat up to 90°C, continue stirring to dissolve them all, and cool down to 35°C;
[0036] 2) Add formaldehyde, sodium lauryl sulfate and 60wt% sulfuric acid solution, and stir for 20 minutes;
[0037] 3) Add sodium bicarbonate and mix evenly, pour into the mold, raise the temperature to 70° C. and keep it for 6 hours to obtain the product.
[0038] The amount of raw materials used is 100 parts of deionized water; 5 parts of organically modified montmorillonite, 10 parts of polyvinyl alcohol, 10 parts of formaldehyde, 1.5 parts of foaming agent, 3 parts of pore-forming agent and 21 parts of catalyst.
[0039] The samples of the above examples were characterized for performance, as shown in Table 1.
[0040] Table 1
[0041]
[0042] Judging from the performance of different examples, the samples all foam and have water absorption properties. However, with the addition of NaHCO...
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Abstract
The invention discloses a preparation method of organic montmorillonite-modified polyvinyl formal sponge. The method comprises the following steps: mixing organic modified montmorillonite, polyvinyl alcohol and deionized water evenly and warming the mixture to 90 DEG C, lastingly stirring the mixture until the mixture is completely dissolved, and cooling the mixture to 25-35 DEG C; adding formaldehyde, a pore-forming agent and a catalyst, and stirring for 10-20 minutes; and adding a foaming agent, mixing the foaming agent evenly, injecting the foaming agent into a mold, warming to 50-70 DEG C and carrying out heat preservation for 3-6 hours to obtain a product; wherein the organic montmorillonite-modified polyvinyl formal sponge comprises the following raw materials: 100 parts of deionized water, 1-5 parts of organic montmorillonite, 10 parts of polyvinyl alcohol, 5-10 parts of formaldehyde, 0.5-1.5 of the foaming agent, 1-3 parts of the pore-forming agent and 7-21 parts of the catalyst. The polyvinyl formal sponge product is modified by the organic montmorillonite; starch is not added; the preparation technology is simple and feasible; an organic-inorganic-organic block penetrating network structure is formed; and the mechanical property, the heat resistance and the chemical resistance of the sponge are obviously improved.
Description
technical field [0001] The invention belongs to the technical field of polymer composite materials, and in particular relates to a preparation method of organic montmorillonite modified polyvinyl formal sponge. Background technique [0002] Sponge is a porous material with good water absorption and high elasticity. The sponges currently on the market are mainly divided into two categories: natural sponges and synthetic sponges. Polyvinyl formal sponge is a kind of synthetic sponge, which is prepared by aldol condensation reaction of polyvinyl alcohol and formaldehyde under the catalysis of acid and using foaming technology. [0003] In the currently published patents, the method of filling and foaming with starch is achieved. The products produced by this technology are difficult to clean the starch completely, and the residual starch is easy to mold and lead to product deterioration, which limits the scope of application. Contents of the invention [0004] The purpose of...
Claims
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