A kind of siloxane series dynamic cross-linking agent and its application
A technology of siloxane series and crosslinking agent, which is applied in the field of polymer material modification, can solve the problems of difficult practical application of materials, expensive raw materials, low mechanical properties of materials, etc., and achieve good repeated processing characteristics, improved impact strength, The effect of improving mechanical properties
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Embodiment 1
[0027] Siloxane-based dynamic crosslinking agent DTSi5
[0028] (((((1,1,3,3,5,5,7,7,9,9-decamethylpentasiloxane-1,9-diyl)bis(azanediyl))bis(methylene))bis(2,1-phenylene )) synthesis of diboronic acid):
[0029] The specific reaction equation is as follows:
[0030]
[0031] The specific implementation steps are as follows: in a round-bottomed flask, add 5.8 g of amino silicone oil, 6.75 g of formaldehyde-based phenylboronic acid, and 50 mL of tetrahydrofuran, and react at room temperature for 3 days under nitrogen protection. Then, 2 g of sodium borohydride was added to the reaction system to reduce the double bond formed by the condensation of aldolamine. The product was concentrated by rotary evaporator, washed repeatedly with dichloromethane and tetrahydrofuran, and then separated and purified by liquid chromatography. The yield is higher than 67%. The corresponding NMR data of the product are as follows: 1H NMR (500MHz, CD3OD): δ 7.51, 7.24, 4.12, 2.6, 0.23. 13C NM...
Embodiment 2
[0033] (1) Preparation of reversible dynamic cross-linked polyamide masterbatch:
[0034] In this example, the siloxane-based dynamic crosslinking agent DTSi5 prepared in Example 1 is described as a typical dynamic crosslinking agent:
[0035] Mix 2% antioxidant system (antioxidant 1010: antioxidant 168=1:2) into 1kg of polyamide 6, stir evenly; add 0.2kg of the above siloxane-based dynamic crosslinking agent DTSi5 into a high-speed mixer , Under normal temperature conditions, fully mix for 30 minutes to obtain a mixture; the mixture is melted, mixed and granulated in a twin-screw extruder to obtain a dynamic crosslinking agent masterbatch, and the melting temperature is controlled below 280 °C.
[0036] (2) Preparation of reversibly cross-linked polyamide 6: in 5kg of polyamide 6, add more than 1kg of dynamic cross-linking agent masterbatch, in a high-speed mixer, fully disperse, and then extrude and granulate in a twin-screw extruder ( The melting temperature is controlled ...
Embodiment 3
[0040] Example 3 Preparation of reversibly cross-linked polyamide 66:
[0041] (1) Preparation of reversible dynamic cross-linked polyamide masterbatch:
[0042] In this example, the siloxane-based dynamic crosslinking agent DTSi5 prepared in Example 1 is described as a typical dynamic crosslinking agent:
[0043] Mix 2% antioxidant system (antioxidant 1010: antioxidant 168=1:2) into 1kg polyamide 66, stir evenly; add 0.2kg of the siloxane-based dynamic crosslinking agent DTSi5 to the high-speed mixer , Under normal temperature conditions, fully mix for 30 minutes to obtain a mixture; the mixture is melted, mixed and granulated in a twin-screw extruder to obtain a master batch of dynamic crosslinking agent, and the melting temperature is controlled below 300 °C.
[0044] (2) preparation of reversibly cross-linked polyamide 66: in 5kg of polyamide 66, add 1kg of the above-mentioned dynamic cross-linking agent master batch, in a high-speed mixer, fully disperse, and then extrud...
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