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Linear thermoplastic polyurethane anchoring agent and preparation method thereof

A thermoplastic polyurethane and anchoring agent technology, applied in the field of materials, can solve the problems of decreased elasticity and increased low-temperature hardness of refrigerator sealing strips, etc.

Active Publication Date: 2019-06-28
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the above-mentioned defects in the prior art, and to provide a self-made one with good low-temperature resistance, which is compatible with PVC, in order to improve the problems of refrigerator sealing strips such as increased low-temperature hardness, decreased elasticity, and long-term plasticizer precipitation. Linear thermoplastic polyurethane anchoring agent ANA with good capacity and resistance to migration and precipitation

Method used

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  • Linear thermoplastic polyurethane anchoring agent and preparation method thereof
  • Linear thermoplastic polyurethane anchoring agent and preparation method thereof
  • Linear thermoplastic polyurethane anchoring agent and preparation method thereof

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preparation example Construction

[0038] The present invention also provides a kind of preparation method of linear thermoplastic polyurethane anchoring agent, comprises the following steps:

[0039] Step 1: Add 10-12 parts by weight of polyether polyol into the reaction kettle, vacuum dehydrate at about 120°C and not lower than -0.08MPa for not less than 1 hour, and then cool down to about 70°C. Add 20 parts by weight of anhydrous dimethylformamide, feed nitrogen into the reaction kettle to remove moisture and oxygen as much as possible, take 4 to 6.1 parts by weight of isocyanate into the reaction kettle, and stir at a speed of 100 to 150 rpm. React at 75-85°C for 2 hours and pressure 0.1-0.15MPa to prepare the prepolymer of the anchoring agent.

[0040] Step 2: Add 0.8-1 part of chain extender and 0.01-0.1 part of catalyst into the reactor, stir at 100-150 rpm, react at 105-115°C for 2-3 hours, and pressure 0.1-0.15MPa , to prepare an unblocked anchoring agent;

[0041] Step 3: Add 0.1-1 part of end-cappi...

experiment example 1

[0043] Fourier Transform Infrared (FTIR) Structural Analysis of Thermoplastic Polyurethane Anchor Agent ANA

[0044] In order to verify whether the synthetic product is the anchoring agent ANA, its structure was studied by FTIR, figure 1 It is the infrared spectrum of the anchoring agent ANA synthesized by IPDI and PEG-PPG-PEG. Depend on figure 1 It can be seen that PEG-PPG-PEG is a -OH stretching vibration peak at 3474cm-1, and IPDI is a -N=C=O characteristic absorption peak at 2259cm-1. After the reaction generates the anchoring agent ANA, at 3334cm- The stretching vibration peak of -NH appeared at 1, the bending vibration of -NH appeared at 1533cm-1, and the stretching vibration of -C=O appeared at 1719cm-1, indicating that the characteristic group -NHCOO- of the anchoring agent ANA was generated, and at 3474cm-1 The absorption peaks at 1 and 2259cm-1 all disappeared, indicating that the reaction was complete, and the anchoring agent ANA anchoring agent was synthesized.

experiment example 2

[0046] Permeation Gel Chromatography (GPC) Test of Anchoring Agent ANA

[0047] Tests by gel permeation chromatography showed that the desired anchoring agent ANA oligomer "anchor" was successfully prepared. Mn=18814, MW=28430, Mw / Mn=1.51, the molecular weight of this anchoring agent ANA "anchoring agent" is appropriate, and the molecular weight distribution is relatively narrow.

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Abstract

The invention provides a linear thermoplastic polyurethane anchoring agent and a preparation method thereof. The anchoring agent contains the following components in parts by weight: 4-6.1 parts of isocyanate, 10-12 parts of polyether polyol, 0.8-1 part of a chain extender, 0.1-1 part of an end-capping reagent and 0.01-0.1 part of a catalyst. The anchoring agent ANA prepared by virtue of the preparation method can be mutually dissolved with PVC, when 60 parts of the anchoring agent ANA is used, the retention rate of elongation at break is increased by 285%, the hardness change rate is decreased by 44% at -10 DEG C, and the separation rate is decreased by 72%. Compared with a DOTP compound plasticizer and a pure DOTP plasticizer, the anchoring agent ANA has the advantages that the hardnesschange rate of the anchoring agent at -30 DEG C is only 24% of that of each of the two plasticizers, and the migration separation rate at -10 DEG C is only 5% of that of each of the two plasticizers.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a linear thermoplastic polyurethane anchoring agent and a preparation method thereof. Background technique [0002] Polyvinyl chloride (PVC) is a widely used general-purpose plastic with excellent mechanical properties. It is the main material for refrigerator sealing strips at home and abroad. According to industry insiders, the proportion of domestic refrigerator sealing strips accounts for 90%, and the consumption exceeds 30,000 tons. PVC has poor low-temperature performance and is sensitive to temperature. As the temperature drops, the hardness increases and the elasticity decreases significantly. After long-term use, the plasticizer precipitates and the sealing effect decreases. This is manifested in the gap between the sealing strip and the box on the refrigerator. Condensation, frost, etc., increase power consumption, and even cause the compressor to run continuously for...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/48C08G18/10C08G18/32
Inventor 武建勋王伟超史晓韬谢海生费德君
Owner SICHUAN UNIV
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