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A kind of 1,6-hexamethylene diisocyanate modified bisphenol A formaldehyde novolac resin and its synthetic method

A technology of hexamethylene diisocyanate and phenolic resin, applied in the direction of aldehyde/ketone condensation polymer adhesives, adhesive types, adhesives, etc., can solve problems such as brittleness, fatigue resistance, heat resistance, and poor impact toughness

Active Publication Date: 2021-11-16
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high crosslinking density of pure bisphenol A formaldehyde phenolic resin, there are disadvantages such as brittleness, fatigue resistance, heat resistance, impact toughness, etc. It is difficult to meet the requirements of engineering technology and its application is limited. Therefore, The toughening modification of bisphenol A formaldehyde phenolic resin has always attracted much attention.

Method used

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  • A kind of 1,6-hexamethylene diisocyanate modified bisphenol A formaldehyde novolac resin and its synthetic method
  • A kind of 1,6-hexamethylene diisocyanate modified bisphenol A formaldehyde novolac resin and its synthetic method
  • A kind of 1,6-hexamethylene diisocyanate modified bisphenol A formaldehyde novolac resin and its synthetic method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Step 1. Add 10 g of bisphenol A formaldehyde novolac resin and 20 mL of acetone into a 100 mL three-necked flask, and stir to completely dissolve the bisphenol A formaldehyde novolak resin.

[0042] Step 2, in N 2 Under protection, 20 μL of dibutyltin dilaurate and 5 g of 1,6-hexamethylene diisocyanate were added into a three-necked flask, and reacted at 10° C. for 1 h. The crude product of 1,6-hexamethylene diisocyanate modified bisphenol A formaldehyde novolac resin can be obtained.

[0043]Step 3. Put the crude product into a dialysis bag for dialysis to remove unreacted 1,6-hexamethylene diisocyanate. The dialysis time is 3 hours.

[0044] Step 4. Dry the dialyzed product at 40° C. in vacuum and low temperature to obtain dark yellow 1,6-hexamethylene diisocyanate modified bisphenol A formaldehyde novolac resin.

Embodiment 2

[0046] Step 1. Add 12 g of bisphenol A formaldehyde novolac resin and 25 mL of acetone into a 100 mL three-necked flask, and stir to completely dissolve the bisphenol A formaldehyde novolak resin.

[0047] Step 2, in N 2 Under protection, 30 μL of dibutyltin dilaurate and 3 g of 1,6-hexamethylene diisocyanate were added into a three-necked flask, and reacted at 30° C. for 2 hours. The crude product of 1,6-hexamethylene diisocyanate modified bisphenol A formaldehyde novolac resin can be obtained.

[0048] Step 3. Put the crude product into a dialysis bag for dialysis to remove unreacted 1,6-hexamethylene diisocyanate. The dialysis time is 5 hours.

[0049] Step 4. Dry the dialyzed product at 40° C. in vacuum and low temperature to obtain dark yellow 1,6-hexamethylene diisocyanate modified bisphenol A formaldehyde novolac resin.

Embodiment 3

[0051] Step 1. Add 15 g of bisphenol A formaldehyde novolac resin and 30 mL of acetone into a 100 mL three-necked flask, and stir to completely dissolve the bisphenol A formaldehyde novolak resin.

[0052] Step 2, in N 2 Under protection, 40 μL of dibutyltin dilaurate and 7 g of 1,6-hexamethylene diisocyanate were added into a three-necked flask, and reacted at 10° C. for 1 hour. The crude product of 1,6-hexamethylene diisocyanate modified bisphenol A formaldehyde novolac resin can be obtained.

[0053] Step 3. Put the crude product into a dialysis bag for dialysis to remove unreacted 1,6-hexamethylene diisocyanate. The dialysis time is 4 hours.

[0054] Step 4. Dry the dialyzed product at 50° C. in vacuum and low temperature to obtain dark yellow 1,6-hexamethylene diisocyanate modified bisphenol A formaldehyde novolac resin.

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Abstract

The invention discloses a 1,6-hexamethylene diisocyanate modified bisphenol A formaldehyde phenolic resin and a synthesis method thereof. The resin grafts 1,6-hexamethylene diisocyanate onto the bisphenol A formaldehyde phenolic resin to form flexibility Strong polyurethane base improves the brittleness of bisphenol A formaldehyde novolac resin, making the modified 1,6-hexamethylene diisocyanate modified bisphenol A formaldehyde novolac resin more flexible, and has the raw material bisphenol A formaldehyde novolac The resin has high molecular weight, high adhesiveness, high acid and alkali resistance, high strength and high elastic modulus; the synthesis method uses 1,6-hexamethylene diisocyanate as a graft monomer and dibutyltin dilaurate as a catalyst, making Under the action of the catalyst, 1,6-hexamethylene diisocyanate forms a graft to form a flexible polyurethane group, which increases the flexibility of the originally rigid bisphenol A formaldehyde novolac resin and 1,6-hexamethylene diisocyanate. Softness; the whole preparation process is relatively simple and easy for industrial promotion.

Description

【Technical field】 [0001] The invention belongs to the field of adhesives, and in particular relates to a 1,6-hexamethylene diisocyanate modified bisphenol A formaldehyde phenolic resin and a synthesis method thereof. 【Background technique】 [0002] Thermosetting resin is a common polymer material. Generally, thermosetting resin is linear or branched before curing. Under the curing agent or its own action, new chemical bonds are established between molecules to form a three-dimensional network structure. , so it is widely used in the field of adhesives. [0003] Most bisphenol A formaldehyde novolac resins are liquid at room temperature, and they are thermoplastic linear polymers. Under normal temperature or heating conditions, bisphenol A formaldehyde novolac resins react with cured Qi to form an insoluble three-dimensional network structure. Molecular plastics, and show their inherent excellent performance. Bisphenol A formaldehyde phenolic resin has excellent adhesion, o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G8/28C09J161/14
Inventor 郭睿李秀环霍文生冯文佩刘雪艳高弯弯闫育蒙张晓飞
Owner SHAANXI UNIV OF SCI & TECH