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A kind of casting type nylon/polyester elastomer and preparation method thereof
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Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A casting mold, nylon technology, used in the field of engineering plastics, can solve the problems of high component matching requirements, difficult control operations, complex formulation processes, etc.
Active Publication Date: 2018-05-22
常州市东海橡胶厂有限公司
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Problems solved by technology
The above methods of polymerizing and modifying cast nylon by adding flexible molecular chain components all have the problem of balancing the possible reduction in mechanical properties caused by flexible components. shortcoming
[0004] To sum up the above, the current toughening preparation technology of cast nylon is mainly realized by introducing flexible components, instead of introducing poor flexibility of molecular chains (hard segments) to improve the toughness of cast nylon and basically maintain the mechanical properties of the preparation technology
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preparation example Construction
[0007] The invention discloses a cast nylon / polyester elastomer formed by anionic polymerization of cyclic butylene terephthalate and a lactam monomer and a preparation method thereof, comprising the following steps:
[0008] Step (a) fully mixing cyclic butylene terephthalate, an appropriate amount of lactam monomer and an organotin catalyst at a temperature of 100-120° C., and performing a vacuuming operation at the same time to obtain a first mixture;
[0009] Step (b) fully mixing the lactam monomer and the caprolactam magnesium bromide catalyst under the condition of 100-120°C, and performing vacuuming operation at the same time to obtain the second mixture;
[0010] In step (c), the first mixture and the second mixture are thoroughly mixed, and anionic ring-opening polymerization is carried out at 180-200° C. to obtain a cast nylon / polyester elastomer.
[0011] The lactam monomer is any one of caprolactam, undecanolactam and laurolactam; the organotin catalyst is any one...
Embodiment 1
[0017] Embodiment 1: the preparation of casting type nylon / polyester elastomer
[0018] Step (a) Fully mix 0.5kg of cyclic butylene terephthalate, 0.5kg of lactam monomer and 1g of dibutyltin catalyst at 100-120°C, and carry out vacuuming operation at the same time, controlling the vacuum degree to be 10~ 30kpa, the vacuum time is 10~30min, and the first mixture is obtained;
[0019] Step (b) Fully mix 1.25kg of lactam monomer and 2.5g of caprolactam magnesium bromide catalyst at 100-120°C, and carry out vacuuming operation at the same time, control the vacuum degree to 10-30kpa, and the vacuuming time to 10-30min , to obtain the second mixture;
[0020] In step (c), the first mixture and the second mixture are thoroughly mixed, and anionic ring-opening polymerization is carried out at 180-200° C., and the reaction time is controlled for 10-60 minutes to obtain a cast nylon / polyester elastomer.
Embodiment 2~4
[0022] Using the raw materials shown in Table 1 in proportion, according to the preparation method of Example 1, a cast nylon / polyester elastomer was obtained.
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Abstract
The invention provides a preparation technology of a cast type nylon / polyester elastomer obtained from annular butylene terephthalate and lactam monomers through anion ring opening polymerization. The preparation technology comprises steps as follows: firstly, the lactam monomers, annular butylene terephthalate and a catalysis system are subjected to vacuum-pumping water removal at the temperature of 110-120 DEG C and then heated to 180-200 DEG C for anion ring opening polymerization, and the cast type nylon / polyester elastomer can be obtained. Compared with conventional polyether modified cast nylon elastomers, the nylon / polyester elastomer prepared with the method has the characteristics of simple preparation process, excellent mechanical strength and impact toughness, low shrinking percentage, good size stability and the like and has broad application prospect in the aspect of structure stress parts in the fields of engineering machinery, heavy truck and rail transit.
Description
technical field [0001] The present invention relates to a kind of preparation method of casting type nylon / polyester elastomer, more exactly, the present invention relates to a kind of by anionic ring-opening polymerization synthesis casting type nylon by cyclic butylene terephthalate and lactam monomer A preparation method of a polyester elastomer belongs to the field of engineering plastics. Background technique [0002] Cast nylon is a polymer material prepared by anionic ring-opening polymerization of lactam monomers under alkali metal catalysis. It has the characteristics of high molecular weight, good mechanical strength, good wear resistance and excellent solvent resistance, and is widely used in wear-resistant parts in construction machinery, automobiles, machine tools and other fields. [0003] At present, in order to improve the impact strength and ductility of cast nylon, it is usually achieved by adding active terminal polyether with flexible molecular chains, m...
Claims
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