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Combination and application thereof

A composition and application technology, applied in the field of polymer chemistry, can solve the problems of low surface gloss, low water flow resistance, long molding cycle, and low cycle heating efficiency, and achieve shortened physical and mechanical properties, short molding cycle, and low production cost. Effect

Inactive Publication Date: 2009-02-04
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the traditional random copolymer polypropylene (PP-R) still has many problems such as poor transparency, low surface gloss (the water flow resistance in the liner is too large, and the circulation heating efficiency is low), rigidity, heat distortion temperature, and creep resistance. Weaker physical and mechanical properties (low safety), and longer molding cycle
There are certain uncertainties in the long-term thermal stability, mechanical properties and processing properties of the traditional random copolymer polypropylene water heater liner

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: The composition that is used to prepare water heater liner, is made up of 0.2wt% 1,3,2,4-dibenzylidene sorbitol and 99.8wt% random copolymer polypropylene; Random copolymer polypropylene is made up of 3 % of ethylene and 97% of propylene are copolymerized by conventional methods (or purchased commercially available products), and the average molecular weight of random copolymerized polypropylene is 1000×10 4 . Its preparation method is: mixing random copolymerized polypropylene and 1,3,2,4-dibenzylidene sorbitol and stirring evenly, or separately mixing random copolymerized polypropylene and 1,3,2,4-dibenzylidene Sorbitol is crushed, and then the two are mixed and stirred evenly.

Embodiment 2

[0012] Embodiment 2: The composition that is used to prepare water heater liner, is made up of 0.3wt% 1,3,2,4-dibenzylidene sorbitol and 99.7wt% random copolymer polypropylene; Random copolymer polypropylene is made of 5 The ethylene of % and the propylene of 95% obtain by conventional method copolymerization (or purchase commercially available product), the average molecular weight of random copolymerization polypropylene is 1000 * 10 4 . Its preparation method is with embodiment 1.

Embodiment 3

[0013] Example 3: The composition of Example 1 or 2 was used to prepare a water heater liner at 220-240° C. according to a conventional method by rotational molding.

[0014] Table 1: The performance comparison of the water heater liner made by the present invention and the prior art

[0015] Thermal Conductivity

[0016] The above table shows that the present invention improves the transparency, surface smoothness, rigidity and heat distortion temperature of the traditional random copolymerized polypropylene water heater inner tank under the condition that the basic performance of the traditional random copolymerized polypropylene water heater tank remains unchanged. , Creep resistance and other physical and mechanical properties and the purpose of shortening the molding cycle, and can alleviate the problems of traditional random copolymer polypropylene materials being brittle at low temperature and poor heat resistance at high temperature.

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PUM

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Abstract

The invention relates to a composition, which contains 0.2 to 0.3wt percent of 1,3,2,4-Dibenzylidene sorbitol and the remaining residual percent of random copolymerized polypropylene. The composition of the invention is applicable to preparing water heater container; the water heater container prepared with the composition of the invention has good surface gloss, rigidity, heat distortion temperature, creep resistance and shorter molding cycle and lower production cost. Test data shows that an amount of 0.3 percent of the TM-1 added in a copolymerized polypropylene and homo polypropylene injection molding product is capable of improving the surface gloss of the product from more than 60 degrees to 110 degrees and improving the heat distortion temperature by at least 130 DEG C; an amount of 0.3 percent of the TM-1 added in a 1mm PP sheet is capable of reducing the turbidity by 67 percent. The product of the invention is also applicable to the technical fields such as rigidity improvement, antireflection of polypropylene and gloss improvement of injection molding products.

Description

Technical field [0001] The invention relates to the technical field of polymer chemistry, in particular to a composition and its application. Background technique [0002] Random copolymerized polypropylene (PP-R) is a polymer compound formed by the polymerization of propylene (chemical formula CH3-CH=CH2). It is obtained by copolymerizing propylene monomer and a small amount of ethylene monomer under the action of heating, pressure and catalyst. Yes, the ethylene monomers are randomly and randomly distributed into the long chains of propylene. Is a non-regular crystalline polymer, milky white, tasteless, odorless, non-toxic. [0003] The traditional random copolymerized polypropylene (PP-R) is obtained by copolymerizing propylene monomer and a small amount of ethylene monomer under the action of heating, pressure and catalyst. The ethylene monomer is randomly and randomly distributed to the long chain of propylene middle. The random addition of ethylene reduces the cryst...

Claims

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Application Information

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IPC IPC(8): C08L23/14C08K5/053F24H9/00B29C41/04
Inventor 刘黎
Owner WUHAN UNIV
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