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PBT composition with ultralow polyurethane adhesive bonding strength

A technology of polyurethane adhesive and bonding strength, applied in the field of ultra-low polyurethane adhesive bonding strength PBT composition, to achieve the effect of reducing bonding strength, good flexural modulus, and low molding shrinkage

Active Publication Date: 2021-05-28
SHANGHAI KINGFA SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by this invention is to provide a PBT composition with ultra-low polyurethane glue bonding strength, to overcome the defect that PBT materials and polyurethane glue have better bonding strength in the prior art

Method used

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  • PBT composition with ultralow polyurethane adhesive bonding strength
  • PBT composition with ultralow polyurethane adhesive bonding strength

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preparation example Construction

[0025] The preparation method of PBT composition in the embodiment of the present invention and comparative example, comprises:

[0026] According to the formula in Table 1, the components are uniformly mixed, melt-extruded through a twin-screw extruder at 170-250° C., and granulated to obtain the product.

[0027] The PBT composition in the embodiment of the present invention and comparative example carries out following test:

[0028] (1) Adhesive strength test: figure 1 It is a polyurethane bonding strength test integral part, wherein the two splines A and B are obtained by injection molding of the same composition of the present invention through an injection molding machine, and the size is 125mm*13mm*1.5mm. When bonding, the two splines are overlapped, Use a jig to compress, and the bonding width is 10mm, as shown in the black area in the figure. The glue is Sikaflex-221. For each comparative example or embodiment, 5 groups of sample strips are bonded and tested. Afte...

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Abstract

The invention relates to a PBT composition with ultralow polyurethane adhesive bonding strength. The composition is prepared from the following components in parts by weight: 75 to 88 parts of PBT, 5 to 10 parts of LDPE, 2 to 5 parts of sodium dodecyl benzene sulfonate, 4 to 13 parts of a toughening agent, 0.2 to 0.5 part of a crystallization accelerant, 0.2 to 0.5 part of an antioxidant and 0.5 to 1.5 parts of a lubricating agent. The composition has ultra-low bonding strength to polyurethane glue, has higher bending modulus and lower molding shrinkage rate, and can well meet the requirements of the fuel gas instrument industry on core framework materials.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a PBT composition with ultra-low polyurethane adhesive bonding strength. Background technique [0002] Usually, what people study is how to improve the glue bonding strength of polymer materials, and how to reduce the bonding strength of materials is rarely studied. For example, Chinese patent CN106221649A discloses a water-based polyurethane shoe adhesive with low viscosity and high bonding strength and a preparation method thereof. The polyurethane glue has high bonding strength, but almost all polyurethane glues have very high bonding strength to PBT. Chinese patent CN111621151A discloses a high-rigidity and high-adhesion-strength nylon reinforcing material and a preparation method thereof. The reinforced nylon material has high adhesive strength. Above-mentioned two patents all do not give the method how to reduce bonding strength of course. However, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L23/06C08L55/02C08L23/08C08K5/42C08K3/34C08K13/02
CPCC08L67/02C08L2205/035C08L2207/066C08L23/06C08L55/02C08L23/0884C08K5/42C08K3/34C08K13/02
Inventor 姚华侠殷年伟丁超
Owner SHANGHAI KINGFA SCI & TECH
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