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Preparation method of melanin stabilizing agent and preparation method of weather-resistant silane modified polyurethane sealing agent

A polyurethane sealant and silane modification technology, which is applied in polyurea/polyurethane adhesives, chemical instruments and methods, adhesives, etc., can solve the problems of high cost and cumbersome components, and prevent oxidation failure, eliminate ultraviolet rays, Effect of improving dispersion performance

Pending Publication Date: 2018-07-10
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above patent documents improve the weather resistance of silane-modified polyurethane sealants by adding a variety of additives with different components, the components are cumbersome and the cost is high

Method used

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  • Preparation method of melanin stabilizing agent and preparation method of weather-resistant silane modified polyurethane sealing agent
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  • Preparation method of melanin stabilizing agent and preparation method of weather-resistant silane modified polyurethane sealing agent

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Preparation of melanin stabilizer: remove the squid ink sac, remove the epidermis and internal reticular membrane, soak in equal volume deionized water at 4°C for 12h, centrifuge at 9000rpm for 15min, adjust the pH to 6.5, add 500u / g papain and collagen at 70°C Protease (mass ratio 1:1) was used for enzymolysis, the temperature was raised to 90°C for 10 minutes, washed with deionized water to pH 7.0, and freeze-dried to obtain melanin; the obtained melanin was weighed and dispersed in bis(1,2,2,6, 6-Pentamethyl-4-piperidinyl) sebacate (mass ratio 2:1), ultrasonication for 10 minutes to obtain melanin stabilizer MS-1.

Embodiment 2

[0046] Preparation of melanin stabilizer: remove the cuttlefish ink sac, remove the epidermis and internal reticular membrane, soak in equal volume deionized water at 0°C for 12h, centrifuge at 10,000rpm for 15min, adjust the pH to 7.0, add 300u / g neutral protease at 60°C Enzymolysis, heat up to 90°C for 10 minutes, wash with deionized water to pH 6.8, freeze-dry to obtain melanin; weigh the obtained melanin, disperse in bis(1-octyloxy-2,2,6,6-tetramethyl -4-piperidinyl) sebacate (mass ratio 1:1), ultrasonication for 5 minutes to obtain melanin stabilizer MS-2.

Embodiment 3

[0048]Preparation of melanin stabilizer: remove the cuttlefish ink sac, remove the epidermis and internal reticular membrane, soak in equal volume deionized water at 0°C for 12h, centrifuge at 10,000rpm for 20min, adjust the pH to 7.2, add 300u / g neutral protease at 65°C Enzymolysis, heat up to 70°C for 10 minutes, wash with deionized water to pH 7.2, freeze-dry to obtain melanin; weigh the obtained melanin, disperse in bis(1-octyloxy-2,2,6,6-tetramethyl -4-piperidinyl) sebacate (mass ratio 2:1), ultrasonication for 5 minutes to obtain melanin stabilizer MS-3.

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Abstract

The invention provides a preparation method of a melanin stabilizing agent and a preparation method of a weather-resistant silane modified polyurethane sealing agent. By adding the obtained melanin stabilizing agent, the obtained weather-resistant silane modified polyurethane sealing agent can have good weather resistance. The preparation method of the melanin stabilizing agent includes the stepsthat melanin prepared through a water washing method or an enzyme hydrolysis method by using sleeve-fishes or cuttlefish ink sacs serve as raw materials evenly disperses in hindered-amine organic compounds to obtain the melanin stabilizing agent, and the mass ratio of melanin to hindered-amine organic compounds is 1-3 to 1. The weather-resistant silane modified polyurethane sealing agent is prepared from, by weight, 100 parts of silyl-terminated modified polyurethane prepolymers and 0.2-3 parts of melanin stabilizing agent. By adopting the stable weather-resistant silane modified polyurethanesealing agent in which the prepared melanin stabilizing agent serves as a single component, the ultraviolet aging resistance performance of the weather-resistant silane modified polyurethane sealing agent can be significantly improved.

Description

technical field [0001] The invention relates to a method for preparing a melanin stabilizer and weather-resistant silane-modified polyurethane sealant, belonging to the technical field of silane-modified polyurethane sealant. Background technique [0002] Silane-modified polyurethane sealant (SPU) is a new type of elastic sealant. The network structure formed after curing has the dual characteristics of polyurethane chain and Si-O-Si bond, so that SPU has both silicone sealant and polyurethane sealant. The advantages. Silane-modified polyurethane sealant has a large number of urethane bonds in its molecular main chain, and it is subjected to heat, light, air, oxygen and water during storage and use, resulting in polymer aging degradation and poor weather resistance. , so it is usually necessary to add additives such as antioxidants, light absorbers, and light stabilizers to enhance the weather resistance of the sealant. Patent document CN102504748B discloses a fast surface...

Claims

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Application Information

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IPC IPC(8): C09J11/06C09J175/04C09J11/04C09B61/00
CPCC08K3/22C08K3/26C08K3/346C08K3/36C08K5/12C08K5/3435C08K13/06C08K2003/2241C08K2003/265C08K2201/014C09B61/00C09J11/04C09J11/06C09J175/04
Inventor 冉千平刘娜孙德文刘玉亭周进俊万赟李波尹浩
Owner JIANGSU SOBUTE NEW MATERIALS
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