Universal polyester high-ratio foamed bead and preparation method thereof

A technology for foaming beads and polyester, applied in the field of polyester foaming beads, can solve the problems of inability to directly make foamed materials, high crystallinity of polyester, and decreased melt strength, etc. The effect of low bubble temperature and short reaction time

Pending Publication Date: 2021-10-19
常州福隆科技新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially in recent years, the newly emerging EPP, polypropylene resin foam material, is a kind of high-crystalline polymer / gas composite material with excellent performance. It is used in the fields of automobiles, turnover boxes, and home furnishing. However, due to its own material, EPP foam has disadvantages such as low heat resistance temperature and poor rigidity.
[0003] Polyethylene terephthalate resin (PET) is a bulk general-purpose material with large output and low cost. It is widely used in various fields of daily life. However, common polyesters have high crystallinity and low viscosity, and their melt strength drops sharply after melting. , usually cannot be directly made into foamed materials

Method used

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  • Universal polyester high-ratio foamed bead and preparation method thereof
  • Universal polyester high-ratio foamed bead and preparation method thereof
  • Universal polyester high-ratio foamed bead and preparation method thereof

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preparation example Construction

[0067] The invention provides a kind of preparation method of polyester foam beads, comprising the following steps:

[0068] 1) After the polyester resin is extruded and granulated and rapidly cooled, non-crystalline polyester particles are obtained;

[0069] 2) At a certain temperature, the non-crystalline polyester particles obtained in the above steps are placed in the mold cavity, filled with supercritical fluid, and after reaching equilibrium, a polymer-supercritical fluid homogeneous system is obtained;

[0070] 3) Pressure release and foam the polymer-supercritical fluid homogeneous system obtained in the above steps to obtain polyester foam beads.

[0071] In the invention, the polyester resin is extruded, granulated and rapidly cooled to obtain non-crystalline polyester particles.

[0072] In the present invention, the melt index of the polyester resin is preferably 0.5-5 g / 10 min, more preferably 1.5-4 g / 10 min, more preferably 2.5-3 g / 10 min. Wherein, the melt ind...

Embodiment 1

[0108] First, the fiber-grade polyester chips and the chain extender are vacuum-dried at 80°C for more than 4 hours, and the moisture content is controlled below 100ppm.

[0109] Then, it is extruded and granulated through a twin-screw extruder. The feed section of the extruder is 250-260°C, the melting section is 260-265°C, the homogenization section is 265-270°C, and the die is 270°C. During the extrusion melting process, 0.35-0.4% of pyromellitic anhydride (PMDA) is added to control the IV value of the polyester to 1.0-1.2 dL / g. Water-stretched granulation is adopted, the cooling water temperature is lower than 5°C, and the crystallization is suppressed by a rapid cooling process, and the non-crystalline to-be-foamed granules with a particle size of 1 mm are made.

[0110] Next, place the particles to be expanded in a high-pressure container with a constant temperature at T1, replace the air, and fill with supercritical carbon dioxide. The supercritical fluid pressure is 16...

Embodiment 2

[0116] First, using the drying method in Example 1, the bottle-grade polyester chips and the chain extender were dried for later use.

[0117] Next, extrude and granulate by a twin-screw extruder, adopt the extrusion process of Example 1, add 0.15-0.18% triglycidyl isocyanurate (TGIC) during the melting process, and control the IV value of polyester to 0.8 -1.0dL / g. Water-stretched granulation is adopted, the cooling water temperature is lower than 5°C, and the crystallization is suppressed through a rapid cooling process, and the non-crystalline to-be-foamed granules with a particle size of 2 mm are made.

[0118] Next, place the particles to be expanded in a high-pressure container with a constant temperature at T1, replace the air, and fill with supercritical carbon dioxide. The supercritical fluid pressure is 13MPa, the temperature T1 is 120°C, and the swelling and infiltration takes 45 minutes to saturation.

[0119] Then, the pressure in the high-pressure container is q...

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Abstract

The invention provides a polyester foamed bead. The foaming ratio of the polyester foamed bead is 20 to 40 times; and the foam hole diameter of the polyester foamed bead is 50-150 [mu] m. The high-ratio polyester foamed bead has a specific structure, particularly has a uniform cellular structure from center to edge, and is an ultra-light material with excellent performance. In addition, the high-ratio polyester foamed bead can be obtained only by adopting polyester of a general mark as a raw material. According to a preparation method provided by the invention, a supercritical fluid is adopted, a specific foaming process is combined, a process is simple, a foaming temperature is low, reaction time is short, environment friendliness is achieved, control is easy, and production efficiency is high; the prepared foamed bead meets the technical requirements of a water vapor forming process; and the method is a typical additive manufacturing process, a material utilization rate reaches 99% or above, a workpiece can be used for a long time at a temperature of -50 to 160 DEG C, an application range is wide, and industrial large-scale production and application can be achieved easily.

Description

technical field [0001] The invention belongs to the technical field of polyester foam beads, and relates to a polyester foam bead and a preparation method thereof, in particular to a general-purpose polyester high-expansion foam bead and a preparation method thereof. Background technique [0002] Polyester resin is a general term for polymer compounds formed by polycondensation of diols or dibasic acids or polyols and polybasic acids. Polyester resins are divided into saturated polyester resins and unsaturated polyester resins. Unsaturated polyester adhesives are mainly composed of unsaturated polyester resins, pigments and fillers, initiators and other additives. The adhesive has low viscosity, easy wetting, and good manufacturability. The cured adhesive layer has high hardness, good transparency, high brightness, can be quickly cured under pressure at room temperature, has good heat resistance, and excellent electrical properties. The disadvantages are large shrinkage, l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/18C08J9/12C08G63/91C08L67/02
CPCC08J9/18C08J9/122C08G63/916C08J2203/06C08J2203/08C08J2203/182C08J2205/044C08J2205/052C08J2367/02
Inventor 周光远聂赫然李巍
Owner 常州福隆科技新材料有限公司
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