CN104610695B - A kind of preparation method of Polypropylene structural wall pipe modified master - Google Patents

Abstract

The present invention disclose a kind of preparation method of Polypropylene structural wall pipe modified master, it is characterized in that first by 100 parts of maleic anhydride inoculated polypropylene, 57 parts of dibenzyl sorbitol is well mixed, the blend composition being well mixed is granulated in double screw extruder.Then N is added in the pellet that will be made again, 57 parts of N ' diphenyl adipamide is well mixed, then is granulated in double screw extruder, prepares Polypropylene structural wall pipe modified master.It is well mixed to can be used to extrude Polypropylene structural wall pipe using 13 parts of masterbatch as being added in polypropylene grain.

Description

A kind of preparation method of Polypropylene structural wall pipe modified master

Technical field

The present invention relates to a kind of preparation method of structured wall popes PP Pipe Compound.More particularly, it relates to a kind of poly- third The preparation method of alkene structured wall popes modified master.

Background technology

Plastic construction wall pipe is mainly used as buried drain pipe, and the purposes of buried drain pipe is under gravity sewage (sanitary sewage, production waste) or rainwater etc. are displaced into sewage farm or rivers,lakes and seas.Buried drain pipe is in plastic tube Consumption is maximum in market, accounts for more than half.Because buried drain pipe is typically conveyed under gravity, the interior not pressure of pipe (because Underground is embedded in, additional load is born) it is primarily subjected to external pressure load, major requirement ring stiffness.The moment of inertia of ring stiffness and tube wall It is directly proportional, so using solid wall pipe not as good as structured wall popes economy.The structured wall popes for reaching same ring stiffness can be than solid wall pipe section About material 50-70%, therefore plastic construction walls pipe has obtained rapid development and has been widely applied in buried drain pipe field.

Current plastic construction wall pipe has polyvinyl chloride and polyolefin (polyethylene or polypropylene) 2 major classes in terms of raw material.Its In, the elastic modelling quantity that Corvic has rigidity very high, its material reaches equal ring firm more than polyolefine material Degree can use less the moment of inertia.If less wall thickness can be used using same Waveform Design, so within the specific limits Polrvinyl chloride structure wall pipe is economically dominant.But for heavy caliber structured wall popes, due to the mobility and heat of polyvinyl chloride Stability is poor, and comparision of production is difficult and uneconomical.

Vistanex had obtained rapid development by its excellent performance in the last few years, and the U.S. is big from terms of foreign data Amount applies polyethylene structure wall pipe, has done substantial amounts of experiment and research, the use experience and relatively more complete mark for having comparative maturity Accurate and specification.And it is very fast in the application development of European Polypropylene structural wall pipe, succeed in developing and used for plastic construction wall pipe Polypropylene dedicated material, and formulated corresponding draft standard.Reason is that acrylic resin has elasticity compared with polyethylene Modulus is big, rigidity is higher, and density is small, can save more raw materials, so that the advantages of reducing production cost and the difficulty constructed, With good cost performance and comprehensive advantage, receive more and more attention.

China starts late in the exploitation of plastic construction wall pipe, in recent years, as country increases the attention to environmental protection, The improvement for water pollution is accelerated, a series of corresponding water savings has been put into effect, has been controlled Water policy, while plastic construction wall pipe is had Excellent properties progressively by people cognition, plastic construction wall has been in control rapid development, has become pipeline field development A big focus.

Although the country develops comparatively fast, for PP Pipe Compound in terms of the production of plastic construction wall pipe and equipment research at present Develop and substantially fall behind.At present the country in terms of materials predominantly polyvinyl chloride and high density polyethylene (HDPE), considerable part be according to By import；For the development of PE PP Pipe Compounds, this has certain development for 2 years, and big petroleum chemical enterprise of domestic several families has stepped up at this The exploitation of aspect is simultaneously proposed the PP Pipe Compound used for heavy caliber structured wall popes；Also have simultaneously and common HDPE resin is modified Research, exploitation adapt to heavy caliber bellows use requirement PP Pipe Compound report.But meet plastic construction wall pipe use requirement Polypropylene dedicated material report it is less.

Plastic construction wall pipe is mainly used in bearing the buried drain pipe domain of external pressure, requires that tubing must have enough resisting External pressure ability, and the size of external pressure ability is born, depending on the ring stiffness of tubing, it is higher that this requires that PP Pipe Compound must have Rigidity, while it is for certain shock resistance, while its crystallization rate wants fast after-contraction small.

Polypropylene is semi-crystalline polymer, is primarily present two kinds of crystal formations：Alpha-crystal form and beta crystal.Wherein, alpha-crystal form polypropylene Tensile strength and bending modulus are higher；The impact strength of Beta-crystalline polyacrylic and thermal deformation are higher.By adding efficient nucleation agent energy Polyacrylic crystallinity is improved, while crystalling propylene temperature can be improved, after-contraction is reduced, shortened process time.

The present invention is in view of the shortcomings of the prior art, there is provided a kind of preparation method of Polypropylene structural wall pipe modified master, will Masterbatch 1-3 parts, as being added in polypropylene grain, to be well mixed can be used for and extrudes Polypropylene structural wall pipe.

The content of the invention

The purpose of the present invention is to solve the shortcomings of the prior art, there is provided a kind of system of Polypropylene structural wall pipe modified master Preparation Method, step is：First by 100 parts of maleic anhydride inoculated polypropylene, dibenzyl sorbitol 5-7 parts is well mixed, will be mixed Close uniform blend composition to be granulated in double screw extruder, extrusion temperature is controlled at 180-245 DEG C.Then the pellet that will be made again Middle addition N, N ' -5-7 parts of diphenyl adipamide are well mixed, then are granulated in double screw extruder, and extrusion temperature control exists 180-245 DEG C, obtain final product Polypropylene structural wall pipe modified master.

Principle of the invention is：

(1) nucleator can improve crystalling propylene temperature, be conducive to shortening forming time, reduce product after-contraction.

(2) dibenzyl sorbitol is polyacrylic efficient alpha-crystal form nucleator, can improve polyacrylic tensile strength and curved Bent modulus and crystallization temperature, shorten crystallization time；

(3) N, N '-diphenyl adipamide are polyacrylic efficient beta crystal-type nucleater, can improve polyacrylic impact strong Degree and heat distortion temperature；

(4) maleic anhydride inoculated polypropylene is polypropylene solubilizer, and anhydride group can be with-the OH in dibenzyl sorbitol Effect generation hydrogen bond, anhydride group also can be with N, and-the CONH- in N '-diphenyl adipamide has an effect, so as to be conducive to two Plant the dispersion of nucleator；

(5) due to-OH in dibenzyl sorbitol can and N, N '-the CONH- in-diphenyl adipamide reacts And using effect is influenceed, therefore the present invention adds granulation by several times by two kinds of nucleators；

(6) enhancing the invention comprehensively utilizes alpha-crystal form nucleator increases just effect and shortens crystallization time effect, beta crystal The toughness reinforcing of nucleator and raising heat distortion temperature effect.

The present invention compared with prior art, has the following advantages that：

(1) invention product is masterbatch, and it is convenient to add；

(2) by using maleic anhydride inoculated polypropylene, dibenzyl sorbitol, N, N '-diphenyl adipamide is by several times The method of addition, solves the intermiscibility of dispersion, the nucleator of nucleator in polypropylene, and two kinds of nucleators react And the harmful effect for producing；

(3) integrating for invention product firm, enhancing, toughness reinforcing and shortening forming time are increased.

Specific embodiment

First by 100 parts of maleic anhydride inoculated polypropylene, 3 parts of dibenzyl sorbitol is well mixed, will mix example one Uniform blend composition is granulated in double screw extruder, and extrusion temperature is controlled at 180-245 DEG C.Then in the pellet that will be made again Add N, N ' -7 parts of diphenyl adipamide to be well mixed, then granulated in double screw extruder, extrusion temperature is controlled in 180- 245 DEG C, prepare Polypropylene structural wall pipe modified master of the invention.

First by 100 parts of maleic anhydride inoculated polypropylene, 5 parts of dibenzyl sorbitol is well mixed, will mix example two Uniform blend composition is granulated in double screw extruder, and extrusion temperature is controlled at 180-245 DEG C.Then in the pellet that will be made again Add N, N ' -5 parts of diphenyl adipamide to be well mixed, then granulated in double screw extruder, extrusion temperature is controlled in 180- 245 DEG C, prepare Polypropylene structural wall pipe modified master of the invention.

First by 100 parts of maleic anhydride inoculated polypropylene, 7 parts of dibenzyl sorbitol is well mixed, will mix example three Uniform blend composition is granulated in double screw extruder, and extrusion temperature is controlled at 180-245 DEG C.Then in the pellet that will be made again Add N, N ' -3 parts of diphenyl adipamide to be well mixed, then granulated in double screw extruder, extrusion temperature is controlled in 180- 245 DEG C, prepare Polypropylene structural wall pipe modified master of the invention.

In specific implementation, using invention product, 1-3 parts is added in polypropylene grain as masterbatch, well mixed to can be used for Extrusion Polypropylene structural wall pipe.The following is invention product, 2 parts are added in polypropylene (trade mark F401), after being extruded by crowded plumber's skill Product sampled data, illustrates its effect for increasing firm, toughness reinforcing, enhancing and shortening forming time.

Claims (1)

1. a kind of preparation method of Polypropylene structural wall pipe modified master, it is characterised in that：

First by 100 parts of maleic anhydride inoculated polypropylene, dibenzyl sorbitol 5-7 parts is well mixed, and well mixed is total to Batch mixing is granulated in double screw extruder, and extrusion temperature is controlled at 180-245 DEG C；Then N is added in the pellet that will be made again, N ' -5-7 parts of diphenyl adipamide is well mixed, then is granulated in double screw extruder, and extrusion temperature is controlled in 180-245 DEG C, prepare Polypropylene structural wall pipe modified master.