Raw material of non-woven fabric and its preparation method and preparation method of non-woven fabric
A technology for non-woven fabrics and raw materials, applied in the field of non-woven fabric raw materials and their preparation, can solve the problems that non-woven fabrics cannot have softness, strength and spinnability at the same time, and achieve flexible use, safety and hygiene. Excellent, avoid wire breakage effect
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[0029] According to a preferred embodiment of the present invention, the polymer composition is prepared by continuous polymerization in the presence of a Ziegler-Natta catalyst with high stereoselectivity, which can reduce the production cost of non-woven fabrics and improve the efficiency of polymerization. At the same time as required by the device, the ethylene-propylene elastic copolymer B is more uniformly dispersed in the polymer composition.
[0030] The continuous polymerization method means that the preparation process includes at least two sequential steps, wherein component (a) (i.e. crystalline polypropylene A) and component (b) (i.e. ethylene-propylene elastic copolymer B) are each in It is prepared in a separate step and, in addition to the first step, the latter step is carried out in the presence of the polymer formed in the previous step and the catalyst used in the previous step.
[0031]In the present invention, the α-olefin with 4-10 carbon atoms can be va...
Embodiment 1
[0096] This example is used to illustrate the non-woven fabric raw material of the present invention, its preparation method and the preparation method of the non-woven fabric.
[0097] (1) Preparation of non-woven raw materials
[0098] The polymerization reaction is carried out on the above-mentioned horizontal gas-phase polypropylene pilot plant, and the reaction is carried out according to the above-mentioned method. The external electron donor used in the polymerization reaction is diisobutyldimethoxysilane, the first reactor is used to prepare component (a) by homopolymerization of propylene, the polymerization temperature is 66°C, the reaction pressure is 2.3MPa, and the residence time is 90 minutes . The melt index obtained by the reaction of component (a) was 43.2 g / 10 min.
[0099]The second reactor is used for propylene copolymerization to prepare component (b). Ethylene and propylene are added into the reactor. The polymerization temperature is 66° C., the reacti...
Embodiment 2
[0105] This example is used to illustrate the non-woven fabric raw material of the present invention, its preparation method and the preparation method of the non-woven fabric.
[0106] (1) Preparation of non-woven raw materials
[0107] Adopt the method identical with embodiment 1 to prepare non-woven raw material.
[0108] (2) Preparation of non-woven fabric
[0109] 90% by weight of the polymer composition and 10% by weight of propylene homopolymer (brand H30S, Sinopec Zhenhai Refining & Chemical, melt index 37.8g / 10min) were mixed and fed into a single-screw extruder, and the rest of the steps were the same as in Example 1 . Obtain non-woven fabric FB2, its properties are shown in Table 1.
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