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Preparation method of high-expansion liquid absorption sponge

A high-expansion, sponge technology, applied in the field of biomedical materials, can solve the problem of high difficulty in cell uniformity, and achieve the effect of simple and easy preparation method, good fluidity and easy pouring

Inactive Publication Date: 2012-07-18
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For foaming in the aqueous phase reaction solution, attention should be paid to the stability of the foam. At this time, it is very difficult to control the uniformity of the cells, and its implementation has certain limitations.

Method used

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  • Preparation method of high-expansion liquid absorption sponge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 5g of PVA-1799 and 50g of water into a three-necked flask with stirring, and heat to 85°C until completely dissolved. Then lower the temperature to 60°C, add 15 g of 18% (mass percentage, the same below) hydrochloric acid and 5 g of 37% (mass percentage, the same below) aqueous formaldehyde solution under stirring, and react at 60°C for 50 minutes.

[0020] Add 50g of PVA-1799 and 500g of water into another three-necked flask, heat to dissolve until clear, then lower the temperature to 60°C, add 150g of 18% hydrochloric acid and 50g of 37% formaldehyde solution under stirring. Stirring was continued for 2 minutes at 60°C.

[0021] The above two liquids were mixed together, and the reaction was continued at 60° C. for 10 minutes.

[0022] Pour the reacted material liquid into the mold, place it in an oven at 65°C and keep it warm for 12 hours, then remove the mold and wash it to obtain a clean sponge body, which is frozen below 0°C and cut into samples of specific s...

Embodiment 2

[0030] Add 5g of PVA-1799 and 50g of water into a three-necked flask with stirring, and heat to 85°C until completely dissolved. Then the temperature was lowered to 60°C, 15 g of 18% hydrochloric acid and 4.5 g of 37% formaldehyde aqueous solution were added under stirring, and the reaction was carried out at 60°C for 50 minutes.

[0031] Add 50g of PVA-1799 and 500g of water into another three-neck flask, heat to dissolve until clear, then lower the temperature to 60°C, add 150g of 18% hydrochloric acid and 45g of 37% formaldehyde aqueous solution while stirring. Stirring was continued for 10 minutes at 60°C.

[0032] The above two liquids were mixed together, and the reaction was continued at 60° C. for 20 minutes.

[0033] Pour the reacted material liquid into the mold, put it in an oven at 65°C and keep it warm for 12 hours, then remove the mold and wash to obtain a clean sponge body, which is frozen below 0°C and cut into samples of specific shapes. It is 8cm long, 2cm ...

Embodiment 3

[0037] Add 5g of PVA-1799 and 60g of water into a three-necked flask with stirring, and heat to 85°C until completely dissolved. Then lower the temperature to 50°C, add 16 g of 18% hydrochloric acid and 5 g of 37% formaldehyde aqueous solution under stirring, and react at 50°C for 50 minutes.

[0038] Add 100g of PVA-1799 and 1200g of water into another three-neck flask, heat to dissolve until clear, then lower the temperature to 50°C, add 320g of 18% hydrochloric acid and 100g of 37% formaldehyde solution under stirring. Stirring was continued for 10 minutes at 50°C.

[0039] The above two materials were mixed together, and the reaction was continued at 50° C. for 20 minutes.

[0040] Pour the reacted material liquid into the mold, put it in an oven and keep it warm at 65°C for 11 hours, then demould and wash to obtain a clean sponge body, which is frozen below 0°C and cut into samples of specific shapes. It is 8cm long, 2cm wide, and 1.5cm thick.

[0041] After the sample...

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Abstract

The invention relates to a preparation method of a high-expansion liquid absorption sponge, which belongs to the field of preparation of biomedical materials. The preparation method comprises the following steps of: mixing two polyvinyl formal reaction solutions with different degrees of reaction, then reacting continuously and performing pouring, curing, demolding, cleaning and other steps for getting a final product. According to the preparation method disclosed by the invention, polyvinyl formal with higher depth of pre-reaction is utilized for making a hole-forming core so as to prepare a sponge material, and the material has the characteristics of regular hole structure, no residue of foreign matters, soft texture, immediate expansion when the material meets with water and the like, and is suitable for surgical hematophagia, liquid absorption and other purposes in the medical field.

Description

technical field [0001] The invention belongs to the field of biomedical materials, and relates to a preparation method of a high-expansion liquid-absorbing sponge. Background technique [0002] Traditional medical cotton gauze is often used in surgical operations. Because of its limited liquid absorption and slow liquid absorption speed, especially the risk of chipping, it is limited in clinical application. As an upgraded substitute for traditional medical cotton yarn, high-expansion medical sponges have been widely used in western developed countries. The typical product comes from American merocel company. Its material is polyvinyl alcohol (PVA) sponge, which has good biocompatibility. It has many advantages such as fast liquid absorption speed and large liquid absorption volume, stable structure without chipping, soft material, comfortable touch, etc. It can be used for postoperative sinus packing, blood absorption and drainage in ophthalmic surgery, neurosurgery and neg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/26C08L29/04C08F16/06C08F8/28A61L15/24A61L15/60
Inventor 张文龙田建文李茂康刘燕燕
Owner NANCHANG UNIV
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