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A kind of ultra-low polyurethane adhesive bonding strength pbt composition

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

Active Publication Date: 2022-07-15
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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  • A kind of ultra-low polyurethane adhesive bonding strength pbt composition
  • A kind of ultra-low polyurethane adhesive bonding strength pbt composition

Examples

Experimental program
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Effect test

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 mixed uniformly, melted and extruded through a twin-screw extruder at 170-250° C., and pelletized to obtain the final product.

[0027] The PBT compositions in the examples of the present invention and the comparative examples are tested as follows:

[0028] (1) Bonding strength test: figure 1 It is an integral part of polyurethane bonding strength test, wherein the two splines A and B are obtained by injection molding of the same composition of the present invention, and the dimensions are both 125mm*13mm*1.5mm, and the two splines are overlapped during bonding, Use a jig to press, and the bonding width is 10mm, as shown in the black area in the picture. The glue is Sikaflex-221, and each comparative example or example is bonded to test 5 sets of splines. After bonding, it is allowed...

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Abstract

The invention relates to an ultra-low polyurethane adhesive bonding strength PBT composition. The composition comprises the following components according to parts by weight: 75-88 parts of PBT, 5-10 parts of LDPE, 2-5 parts of sodium dodecylbenzenesulfonate, 4-13 parts of toughening agent, and 0.2-13 parts of crystallization accelerator. 0.5 part, antioxidant 0.2-0.5 part, lubricant 0.5-1.5 part. The composition has ultra-low bonding strength to polyurethane glue, and the composition has high flexural modulus and low molding shrinkage, and can well meet the requirements of the gas instrument industry for core skeleton materials.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and particularly relates to an ultra-low polyurethane adhesive bonding strength PBT composition. Background technique [0002] Usually, people study how to improve the adhesive strength of polymer materials, and seldom study how to reduce the adhesive strength of materials. 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 high bonding strength to PBT. Chinese patent CN111621151A discloses a nylon reinforced material with high rigidity and high bonding strength and a preparation method thereof. The reinforced nylon material has high bonding strength. However, neither of the above two patents provides a method of how to reduce the bond strength. However, in the field of gas meters...

Claims

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Application Information

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Patent Type & Authority Patents(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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