A control method for direct crystallization of isotactic poly-1-butene melt to generate i′ crystal
A butene and isotactic technology, which is applied in the field of polymer modification, can solve the problems of complex overall process and inapplicability, and achieve the effect of simple process, remarkable effect and increased cycle times
Active Publication Date: 2020-06-05
TIANJIN UNIV
View PDF2 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The method proposed by Wang Yaotao et al. to obtain I' crystals from the melt and control its content is suitable for typical 1-butene-ethylene random copolymers, but not for homopolymerized iP-1-B
Existing technologies show that thermodynamically stable crystal form I' can also be obtained directly from iP-1-B melt under some specific conditions, such as ultra-thin film, self-crystallization, high pressure, copolymerization, etc., but the overall process is complicated
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0022] The technical solutions of the present invention will be further described below in conjunction with specific embodiments.
[0023] Weigh 7g of iP-1-B 0110M (Basell, homopolymeric iP-1-B), preheat it with a flat vulcanizing machine at 180°C for 10min, and then gradually increase the pressure to 25MPa, the highest pressure Keep it warm for 3 minutes, then cold press it at 25MPa for 8 minutes, and press it into a 0.5mm thick sheet sample. After taking it out, place it at room temperature 20-30 degrees Celsius for 30 days (24*30 hours), so that the II crystal is basically transformed into I crystal, such as attached figure 1 and 2 shown.
[0024] Cut the sample into 1mm length and 1mm width, wrap it with a single layer of aluminum foil, use the linkam hot stage to heat the sample from room temperature 20-30 degrees Celsius to 150 degrees Celsius at a heating rate of 5 degrees Celsius / min for melting, keep the temperature for 3 minutes, and then heat it up at a rate of 5 ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| density | aaaaa | aaaaa |
| melting point | aaaaa | aaaaa |
| density | aaaaa | aaaaa |
Login to View More
Abstract
The invention discloses a regulation and control method for generating I' crystal through direct crystallization of an isotactic poly1-butene melt. Isotactic poly1-butene in a crystal form II is subjected to a circulating heating process including heating, thermal insulation and cooling, the proportion of a crystal form I' generated through direct crystallization is regulated and controlled by changing the circulating number of times, and the proportion of crystallization peaks of the crystal form I' to total crystallization peaks is gradually increased along with the increase of the circulating number of times; and the operation is simple in process and operability is strong.
Description
technical field [0001] The invention belongs to the technical field of polymer modification, and more specifically, relates to a method for controlling the crystallization of isotactic poly-1-butene melt to directly generate crystal form I'. Through this technical method, the formation of I' can be regulated and controlled as required. The ratio of 'crystal and II crystal. Background technique [0002] Isotactic poly-1-butene (iP-1-B) is a thermoplastic resin belonging to semi-crystalline polyolefins, known for its good mechanical properties, outstanding creep resistance, low temperature flow resistance and environmental resistance Stress cracking resistance, wear resistance, flexibility and high filler filling, etc., are called "plastic gold", and are currently mainly used in hot water pipes, synthetic fibers, food packaging, medical equipment and other fields. As a polycrystalline polymer, iP-1-B crystallizes under different conditions to form five different crystal forms...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/00C08L23/20
CPCC08J3/00C08J2323/20
Inventor 李景庆蔡晓倩蒋世春尚英瑞
Owner TIANJIN UNIV