Siloxane-based dynamic cross-linking agent and application thereof
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] Concrete reaction equation is as follows:
[0030]
[0031] The specific implementation steps are as follows: in a round bottom flask, add 5.8g of amino silicone oil, 6.75g of formaldehyde phenylboronic acid, 50mL of tetrahydrofuran, and react at room temperature for 3 days under the condition of nitrogen protection. Then, 2g of sodium borohydride was added to the reaction system to reduce the double bond formed by the condensation of aldehyde and amine. The product was concentrated by a 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): δ7.51, 7.24, 4.12, 2.6, 0.23. ...
Embodiment 2
[0033] (1) Preparation of reversible dynamic cross-linked polyamide masterbatch:
[0034] In this embodiment, the siloxane-based dynamic cross-linking agent DTSi5 prepared in Example 1 is described as a typical dynamic cross-linking agent:
[0035] Mix 2% of the antioxidant system (antioxidant 1010:antioxidant 168=1:2) into 1kg polyamide 6 and stir evenly; add 0.2kg of the above-mentioned siloxane-based dynamic crosslinking agent DTSi5 into a high-speed mixer , under normal temperature conditions, fully mixed for 30 minutes to obtain a mixture; the mixture was melt-mixed and granulated in a twin-screw extruder to obtain a dynamic crosslinking agent masterbatch, and the melting temperature was controlled below 280°C.
[0036] (2) Preparation of reversibly crosslinked polyamide 6: in 5kg polyamide 6, add more than 1kg of dynamic crosslinking agent masterbatch, fully disperse in a high-speed mixer, and then extrude and granulate in a twin-screw extruder ( The melting temperature...
Embodiment 3
[0040] The preparation of embodiment 3 reversible cross-linked polyamide 66:
[0041] (1) Preparation of reversible dynamic cross-linked polyamide masterbatch:
[0042] In this embodiment, the siloxane-based dynamic cross-linking agent DTSi5 prepared in Example 1 is described as a typical dynamic cross-linking agent:
[0043] Mix 2% of the antioxidant system (antioxidant 1010:antioxidant 168=1:2) into 1kg of polyamide 66 and stir evenly; add 0.2kg of the siloxane-based dynamic crosslinking agent DTSi5 into a high-speed mixer , under normal temperature conditions, fully mixed for 30 minutes to obtain a mixture; the mixture was melt-mixed and granulated in a twin-screw extruder to obtain a dynamic crosslinking agent masterbatch, and the melting temperature was controlled below 300°C.
[0044] (2) Preparation of reversibly cross-linked polyamide 66: in 5 kg polyamide 66, add 1 kg of the above-mentioned dynamic cross-linking agent masterbatch, fully disperse in a high-speed mixer...
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