CN1323848A - Rare earth modified cast mylon preparing process - Google Patents

Abstract

The present invention relates to the preparation of rare earth modified costing type nylon, it synthesizes neody mium naphthenate rare earth modifier and rare earth ester coupling agent, so that the various mechanical properties of the synthesized material are raised by about 20%, the molecular weight of the nylon is doubled, crystallinity is raised by about 7%, the heat resistance of MC nylon is increased by 30 deg.C, water absorption is reduced by 50%, the size of MC mylon is improved, fastness to wear and other mechanical properties are improved.

Description

Rare earth modified cast mylon preparing process

The present invention relates to a kind of naphthenic acid mishmetal properties-correcting agent, belong to the synthetic materials modification.

At present, rare earth modified MC nylon mainly contains two kinds, and a kind of is that the rare-earth original ore powder is as the weighting agent modified MC nylon; Be mainly and reduce cost improved performance; Another kind is a naphthenic acid mishmetal kerosin modified MC nylon, and this properties-correcting agent is also dosed other synthetic materialss such as synthetic glass, fluoroplastics, and every mechanical property improves about 20%, and wear resistance doubles.Relevant neodymium naphthenate rare-earth modifier is not reported for work as yet.

The purpose of this invention is to provide a kind of rare earth modified cast mylon preparing process, every mechanical property of synthetic materials improves about 20%, and the molecular weight of MC nylon increases and is twice, degree of crystallinity improves about 7%, thermotolerance improves 30 ℃, and water-intake rate reduces more than one times, and cost is low, processing method is simple.

Rare earth modified cast mylon preparing process of the present invention, its preparation process is:

(1) the Neodymium trichloride dilution is the aqueous solution, with the naphthenic acid mixing of accurate acid value;

(2) with alkaline solution neutralization, treat that neutralization is finished after, heating is reaction fully, the neodymium naphthenate layer is got in static separation, fully is washed to neutrality, is neodymium naphthenate;

(3) with neodymium naphthenate oxygenolysis in air, available gasoline, kerosene mix, and are the neodymium naphthenate rare-earth modifier;

(4), after extremely active hexanolactam positively charged ion is completed into, add the neodymium naphthenate rare-earth modifier with MC nylon production technique;

(5) will dewater once more, and carry out static cast poymerization, its add-on is 5～7%, when its water content meets the polymerization requirement, adds isocyanic acid lipid promotor, mixes, and carries out in-site polymerization.

Rare earth modified cast mylon preparing process of the present invention, be characterized in: naphthenic acid rare earth is generally the naphthenic acid mishmetal, and in mishmetal, the rare earth that has played modifying function is a neodymium, synthesize the neodymium naphthenate rare-earth modifier, thereby found the single rare earth kind in the rare earth class modifying element.In addition, the present invention has also synthesized rare earth organic ester coupling agent.Above-mentioned two class rare-earth modifiers add after MC nylon activated monomer is finished, in polymkeric substance, rare-earth modifier forms polymerization site, thereby increase MC nylon molecular weight more than one times, improve degree of crystallinity about 7%, and make the crystalline form refinement, crystallizing field and noncrystalline domain miniaturization, pencil fracture after fracture, occurs, be ductile rupture but not common MC nylon has brittle rupture.Because molecular weight increases, the MC density of nylon increases, and chemicals-resistant corrosion and water-fast swelling obviously increase, and has improved product size stability and performances such as thermotolerance, chemicals-resistant corrodibility.Because the raising and the refinement of degree of crystallinity make every mechanical property of MC nylon improve about 30%, wear resistance is enhanced about more than once.

Rare earth modified casting nylon products of the present invention, its salient features is as follows:

Proportion kg/m ³1170

Water-absorbent % 0.07

Heat-drawn wire ℃ 190

Tensile strength MPa 100

Notched Izod impact strength KJ/m ²570

Coefficient of friction 0.10

Claims (1)

1, a kind of rare modified cast mylon preparing process of going into is characterized in that:

(1) the Neodymium trichloride dilution is the aqueous solution, with the naphthenic acid mixing of accurate acid value;

(2) with alkaline solution neutralization, treat that neutralization is finished after, heating is reaction fully, the neodymium naphthenate layer is got in static separation, fully is washed to neutrality, is neodymium naphthenate;

(3) with neodymium naphthenate oxygenolysis in air, available gasoline, kerosene mix, and are the neodymium naphthenate rare-earth modifier;

(4), after extremely active hexanolactam positively charged ion is completed into, add the neodymium naphthenate rare-earth modifier with MC nylon production technique;

(5) will dewater once more, and carry out static cast poymerization, its add-on is 5～7%, when its water content meets the polymerization requirement, adds isocyanic acid lipid promotor, mixes, and carries out in-site polymerization.