Polyformaldehyde composition and preparation method thereof

The technology of a polyoxymethylene composition and a polyoxymethylene resin is applied in the field of polyoxymethylene composition and its preparation, which can solve the problems of poor toughness, brittle material, and difficulty in demolding of polyoxymethylene materials, so as to improve crystal structure and reduce spherulites. Size, nucleation effect is obvious

Inactive Publication Date: 2012-10-03
YUNNAN YUNTIANHUA
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] However, the spherulites formed by POM itself are very large, some grades of POM spherulites can reach 500 μm, the spherulite interface is very obvious, and the stress is concen

Method used

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  • Polyformaldehyde composition and preparation method thereof
  • Polyformaldehyde composition and preparation method thereof
  • Polyformaldehyde composition and preparation method thereof

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Example Embodiment

[0038] Correspondingly, the present invention also provides a preparation method of a polyoxymethylene composition, including the following steps: 100 parts by weight of polyoxymethylene resin, 0.01 to 2 parts by weight of antioxidant, 0.01 to 2 parts by weight of formaldehyde trapping agent, 0.01-2 parts by weight of formic acid trapping agent and 0.01-5 parts by weight of cross-linked polyoxymethylene resin are melted in a twin-screw extruder at 160-250°C, and a polyoxymethylene composition is obtained after extrusion.

[0039] The present invention uses polyoxymethylene resin, antioxidant, formaldehyde trapping agent, formic acid trapping agent and cross-linked polyoxymethylene resin as raw materials for preparation, wherein the polyoxymethylene resin is made of -[CH 2 O]- is the main repeating unit of homopolyoxymethylene or -[CH 2 O]-and-[CH 2 -CH 2 O]- is the copolyformaldehyde which is the main repeating unit. The melt index of the polyoxymethylene resin under standard cond...

Example Embodiment

[0053] Example 1

[0054] Mix 100 parts by weight of polyformaldehyde, 2450.3 parts by weight of antioxidants, 0.05 parts by weight of melamine, 0.1 parts by weight of calcium stearate, 0.1 parts by weight of cross-linked polyformaldehyde, and 0.05 parts by weight of nano-calcium carbonate. After 3 minutes of moderate stirring, a twin-screw extruder was used for extrusion and granulation to obtain a polyoxymethylene composition. The specific processing technology was as follows: temperature: 175℃ in the first zone, 180℃ in the second zone, 185℃ in the third zone, 190℃ in the fourth zone, and five Zone 190°C, zone 6 190°C, zone 7 190°C, zone 8 190°C, zone 9 190°C, head 190°C; feeding revolution 15; screw revolution 200.

[0055] The polyoxymethylene composition prepared in this example was tested for tensile strength, tensile modulus, elongation at break, notched impact and 5% weight loss time. The results are shown in Table 2.

[0056] The polarization performance of the polyoxymeth...

Example Embodiment

[0057] Example 2

[0058] Mix 100 parts by weight of polyformaldehyde, 2450.3 parts by weight of antioxidants, 0.05 parts by weight of melamine, 0.1 parts by weight of calcium stearate, 0.1 parts by weight of cross-linked polyformaldehyde, and 0.05 parts by weight of nano-calcium carbonate. Under medium stirring for 3 minutes, a twin-screw extruder was used for extruding and granulating to obtain a polyoxymethylene composition. The specific processing technology is: Zone 1 195℃, Zone 2 200℃, Zone 3 205℃, Zone 4 210℃, Zone 5 210 ℃, 6 zone 210℃, 7 zone 210℃, 8 zone 210℃, 9 zone 210℃, head 210℃; feeding speed 15; screw speed 200.

[0059] The polyoxymethylene composition prepared in this example was tested for tensile strength, tensile modulus, elongation at break, notched impact and 5% weight loss time. The results are shown in Table 2.

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Abstract

The invention discloses a polyformaldehyde composition and a preparation method thereof. The polyformaldehyde composition contains by part of weight: 100 parts of acetal resins, 0.01-2 parts of oxidation inhibitors, 0.01-2 parts of formaldehyde catching agents, 0.01-2 parts of formic acid catching agents and 0.01-5 parts of crosslinking acetal resins. Compared with the prior art, the crosslinking acetal resins serve as nucleating agents and are obvious in nucleating effects, and a great number of crystal nucleuses are formed before crystallization of the acetal resins, so that crystallization of the acetal resin is induced, the number of the crystal nucleuses is improved, crystallization degree and temperature are improved, sphaerocrystal dimension is lowered, and accordingly crystallization structure of the acetal resin is improved. Further, due to the fact that the adding amount of the crosslinking acetal resins is small, and bad influence on mechanical property, thermal performance and surface morphology of the polyformaldehyde composition is avoided. Experiment results prove that the sphaerocrystal dimension of the polyformaldehyde composition is about 40 mu m, and the polyformaldehyde composition has good crystalline structure and good mechanical property.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a polyoxymethylene composition and a preparation method thereof. Background technique [0002] POM (Polyoxymethylene, POM), also known as oxymethine polymer, is one of the world's top five engineering plastics, and its output is second only to nylon and polycarbonate, ranking third in the world. Due to the difference in structure, polyoxymethylene can be divided into two categories: one is homopolyoxymethylene, which was developed by DuPont Company of the United States and realized industrial production in 1959. The trade name is Delrin. Homopolyoxymethylene has good strength, rigidity and fatigue resistance. However, because homopolyoxymethylene is composed of carbon-oxygen bonds, its thermal performance is poor and it is easy to decompose during processing. The other is polyoxymethylene copolymer, which was successfully developed and industrialized by Celanse Company...

Claims

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Application Information

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IPC IPC(8): C08L59/00C08K13/02C08K5/3492C08K5/098C08K3/26
Inventor 冯志强普雪涛兰林樊钹
Owner YUNNAN YUNTIANHUA
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