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Method for controlling internal stress distribution in material and method for reading information

A technology for reading information and applying external force, which is applied in the direction of control/regulation system, non-electric variable control, mechanical pressure/force control, etc., and can solve problems such as uncontrollable internal stress and influence of material properties

Active Publication Date: 2020-10-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although internal stress is an unfavorable factor in the process of polymer processing, the reason is that the internal stress during processing is uncontrollable, and we cannot predict how this residual internal stress will affect the performance of the material

Method used

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  • Method for controlling internal stress distribution in material and method for reading information
  • Method for controlling internal stress distribution in material and method for reading information
  • Method for controlling internal stress distribution in material and method for reading information

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Embodiment 1 (saturated polyester system 1)

[0076] Raw materials: polycaprolactone diacrylate (PCLDA): Mw=10000, Sigma-Aldrich Company; 2-(9-oxo-anthene-2-yl)propionic acid 1,5,7-triazybicyclo[4.4.0 ] Dec-5-ene salt: TCI Company; tetrakis (3-mercaptopropionic acid) pentaerythritol ester (Tetrathiol): Sigma-Aldrich Company; dimethylformamide (DMF): Sigma-Aldrich Company.

[0077] Preparation method: Dissolve 2mmol of polycaprolactone diacrylate and 1mmol of tetrakis(3-mercaptopropionic acid)pentaerythritol ester in 15ml of dimethylformamide, wherein the amount of PCLDA and Tetathiol is the molar ratio of double bond to mercapto group 1:1, after heating to 90°C to dissolve, add 2-(9-oxoanthen-2-yl)propionic acid 1,5,7-triazbicyclo[4.4.0]dec-5-ene salt (its The amount added is 2% of the total mass of the system), stirred to make it dissolve completely. The above solution was injected into a sealed glass tank, and placed at 80°C for 6 hours. After solidification, it was...

Embodiment 2

[0083] Embodiment 2 (saturated polyester system 2)

[0084] Raw material: polycaprolactone diacrylate (PCLDA): Mn=10,000, Sigma-Aldrich Company; ] Dec-5-ene salt: TCI company; n-butyl acrylate (BA): Sigma-Aldrich company; dibenzoyl peroxide (BPO): Sigma-Aldrich company Dimethylformamide (DMF): Sigma-Aldrich company.

[0085] Preparation method: Dissolve 1g of polycaprolactone diacrylate and 2g of n-butyl acrylate in 10ml of dimethylformamide, and heat to 80°C. Then add dibenzoyl peroxide (the addition amount is 1% of the total mass of the system), 2-(9-oxoanthen-2-yl) propionic acid 1,5,7-triazebicyclo[4.4.0] Dec-5-ene salt (the amount added is 1% of the total mass of the system). Inject the above solution into a sealed glass tank, place it at 120°C for 1.5 hours, then raise the temperature to 140°C for 4 hours, take it out after solidification and place it in a vacuum drying oven, and dry it at 80°C for 24 hours.

[0086] Stress adjustment and observation:

[0087] The a...

Embodiment 3

[0089] Embodiment 3 (unsaturated polyester system)

[0090] Raw material: Styrene: Sigma-Aldrich Company; Unsaturated polyester oligomer: o-phthalic type, maleic anhydride content is 15wt%; Triazinobicyclo[4.4.0]dec-5-ene salt: TCI Company; cyclohexanone peroxide (UV-184): Aladdin Reagents (Shanghai) Co., Ltd.; cobalt naphthenate: Aladdin Reagents (Shanghai) Co., Ltd. company.

[0091] Preparation method: 7g unsaturated polyester oligomer (orthophthalic type, unsaturated maleic anhydride content is 15wt%), 3.5g styrene, 0.1g cyclohexanone peroxide, 0.1g cobalt naphthenate and 0.3g 2 -(9-oxoanthen-2-yl)propionic acid 1,5,7-triazobicyclo[4.4.0]dec-5-ene salt was mixed uniformly at room temperature, poured into an aluminum pan, and placed in an oven, React at 50°C for 3 hours, then raise the temperature to 80°C for 6 hours, and then get a thermosetting unsaturated polyester resin after cooling.

[0092] Stress adjustment and observation:

[0093] Put the above polymer film in...

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Abstract

The invention relates to a method for controlling the internal stress distribution of materials, comprising the following steps: 1) preparing a cross-linked polymer containing reversible exchange bonds; 2) applying an external force to the cross-linked polymer to cause a certain strain; 3) Specific regions of the cross-linked polymer are selectively heated while maintaining the strain of the cross-linked polymer. The method controls and utilizes the unfavorable internal stress considered in the prior art. The invention also provides a method for reading information in a polarized light field. The cross-linked polymer processed by the method is transparent under natural light, and the information in it can only be read under polarized light, which has a certain degree of concealment. sex.

Description

technical field [0001] The invention relates to the application field of cross-linked polymers, in particular to a method for controlling the internal stress distribution of materials and a method for reading information. Background technique [0002] Stress refers to the force on an object per unit area, and it emphasizes the internal force of the object. Generally, when an object is subjected to external force, the internal stress against the external force will be generated; when the object is not subjected to external force, the internal inherent stress is called internal stress, which is caused by the uneven plastic deformation of various parts inside the object. produced. [0003] According to the scope of the internal stress, it can be divided into three categories: the first type of internal stress (macroscopic internal stress), that is, the internal stress in the macroscopic range caused by the uneven deformation of various parts of the material; the second type of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D23/32
CPCG05D23/32C08J3/248C08J2333/04C08J2367/04C08J2375/06G06K7/1417G05D15/01C08F2438/03C08F293/005
Inventor 谢涛吴晶军赵骞张国高
Owner ZHEJIANG UNIV