CN101289572B - Nonsaturated resin brittle material convenient for presetting built-in crack and process for preparing test piece - Google Patents
Nonsaturated resin brittle material convenient for presetting built-in crack and process for preparing test piece Download PDFInfo
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- CN101289572B CN101289572B CN2008100167841A CN200810016784A CN101289572B CN 101289572 B CN101289572 B CN 101289572B CN 2008100167841 A CN2008100167841 A CN 2008100167841A CN 200810016784 A CN200810016784 A CN 200810016784A CN 101289572 B CN101289572 B CN 101289572B
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Abstract
The present invention relates to brittle non-saturated resin material convenient to preset built-in cracks, which comprises compositions with the following volume ratios: 90 to 100 portions of non-saturated polyester resin, 0.5 to 2 portions of methyl ethyl ketone peroxide, and 0.5 to 2 portions of cobalt isocaprylate. At the same time, the invention also discloses a method utilizing the brittle non-saturated resin material to prepare a test piece. The non-saturated resin material has good brittleness and can show a brittle bursting characteristic when the material is freezed to 10 DEG G below zero. Under the condition of 50 DEG C below zero, the tension-compression strength ratio can reach more than one fifth; corresponding mechanical parameters are as follows: the yang modulus of elasticity E is equal to 5.6GPa, the single-axis compressive strength sigmac is equal to 127MPa, and the model-I fracture toughness KIC is equal to 0.55MPa.m<1/2>. The material has the advantages of good brittleness, high transparency, easy molding, and being convenient to preset built-in cracks and so on.
Description
Technical field
The present invention relates to a kind of forming materials technology, especially a kind of nonsaturated resin brittle material and preparation method of being convenient to presetting built-in crack.
Background technology
The destructive process of hard brittle material and internal crack expansion evolution rule are the emphasis of solid mechanics research always.The test materials of seeking that a kind of fragility is good, transparency is high and being convenient to preset the crack is the emphasis and the difficult point of experimental study.The brittleness degree of material is to weigh with the ratio of stretching and compressive strength, adopts the good material of fragility can more accurately must react the stress deformation feature of brittle solid.And select for use the high material of transparency can be convenient to observe the expansion evolutionary process of internal crack.
Up to the present, lot of domestic and international scholar selects for use transparent homogeneous material to study, utilize the macromolecule transparent material (synthetic glass, CR-39 resin, Columbia resin etc.) of some moulded by castings to study built-in crack expansion evolution rule as A.V.Dyskin and L.N.Germanovich people such as (1994,2002).Utilization such as the Huang Kaizhu in Hong Kong (2004) PMMA has carried out the research of external crack expansion.The transparent materials such as resin that they adopted all belong to toughness reinforcing casting type, and plasticity is bigger, even under cold condition (17 ℃), its tensile and compressive strength can only reach 1/3 than generally, and degree of brittleness is not high.In addition, because toughness reinforcing technology, it is higher to preset leading edge zone, crack stress concentration degree, can produce certain plastic flow in crack propagation process, thereby influences the accuracy of experimental result.As seen, all there is certain shortcoming and defect in forefathers' material therefor.
Summary of the invention
The present invention is for overcoming above-mentioned the deficiencies in the prior art, provides that a kind of fragility is good, transparency is high, is easy to moulding and is convenient to the material nonsaturated resin brittle material and the preparation method of presetting built-in crack.
The objective of the invention is to adopt following technical proposals to realize: a kind of nonsaturated resin brittle material of being convenient to presetting built-in crack comprises the composition of following volume ratio: 90～100 parts of unsaturated polyester resins; 0.5～2 part of methylethyl ketone peroxide, 0.5～2 part of cobalt iso-octoate.
Described unsaturated polyester resin is that model is the 6688# unsaturated polyester resin.
Utilize nonsaturated resin brittle material to prepare the method for test specimen, may further comprise the steps:
1) measures raw material: unsaturated polyester resin, methylethyl ketone peroxide and the cobalt iso-octoate of measuring respective volume according to proportioning;
2) stir: at first unsaturated polyester resin and methylethyl ketone peroxide are poured in the clean ripe Glass Containers, and stirred; Pour the cobalt iso-octoate of measuring then into, be stirred to once more and mix;
3) resin cast that stirs casting: test piece mould is installed, the crack sheet is bound in the mould with thin cotton thread, mould is put on the horizontal stand, and with step 2) is gone in the mould;
4) maintenance: place and carry out maintenance in the thermostat container watering the mould of filling with resin in the step 3), Thermostat Temperature Control between 15 ℃～25 ℃, treat that resin integral body is solidified after, the demoulding can obtain the nonsaturated resin brittle material test specimen with crack in presetting.
Main raw material of the present invention is 6688# resin and corresponding curing agent (methylethyl ketone peroxide) and catalyzer (cobalt iso-octoate).Because the degree of brittleness temperature influence of this material is bigger, the proportioning that need regulate solidifying agent and catalyzer along with variation of temperature also can guarantee specimen molding to guarantee that material fragility is good.
The nonsaturated resin material of the present invention's preparation has good fragility, just presents brittle explosion feature when being refrigerated to-10 ℃.Under-50 ℃ of conditions, the tensile and compressive strength specific energy reaches more than 1/5, and the corresponding mechanics parameter is as follows: Young's modulus of elasticity E=5.6GPa, uniaxial compressive strength σ
c=127MPa, I type fracture toughness K
IC=0.55MPa
1/2The present invention is enbrittled, the transparency height, be easy to moulding and be convenient to advantages such as presetting built-in crack.
Description of drawings
Fig. 1 is the stress-strain curve diagram of low-temperature resins material;
Fig. 2-Fig. 4 is the expansion evolutionary process figure of built-in crack in the resin test specimen;
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
Embodiment 1: the nonsaturated resin brittle material of presetting built-in crack comprises the composition of following volume ratio: 6688# unsaturated polyester resin 100ml; Methylethyl ketone peroxide 1.5ml, cobalt iso-octoate 0.5ml.
The preparation of unsaturation brittle resin material and to utilize resin material to make the process of test specimen as follows:
(1) measures raw material: 6688# unsaturated polyester resin 100ml; Methylethyl ketone peroxide 1.5ml, cobalt iso-octoate 0.5ml.
(2) stir: 100ml6688# unsaturated polyester resin and the 1.5ml methylethyl ketone peroxide that will measure are poured in the ripe Glass Containers, and stir, and pour cobalt iso-octoate 0.5ml then into, are stirred to once more to mix.Notice that methylethyl ketone peroxide can not directly mix with cobalt iso-octoate, also can not pour into simultaneously, otherwise chemical reaction burning even blast take place.
(3) casting: test piece mould is installed, preset the crack, the crack sheet can be bound in the mould with thin cotton thread, mould is put on the horizontal stand, and the resin cast that stirs is gone in the mould as need.
(4) maintenance: will water under the constant temperature that the mould of filling with resin places 20 ℃ and solidify, but treat resin integral body solidify after the just demoulding, can obtain nonsaturated resin brittle material test specimen with crack in presetting.
The nonsaturated resin material of preparation has good fragility, just presents brittle explosion feature when being refrigerated to-10 ℃.Under-50 ℃ of conditions, the tensile and compressive strength specific energy reaches more than 1/5, and the corresponding mechanics parameter is as follows: Young's modulus of elasticity E=5.6GPa, uniaxial compressive strength σ
c=127MPa, I type fracture toughness K
IC=0.55MPam
1/2Under the uniaxial compression condition, the low-temperature resins stress-strain relationship of material as shown in Figure 1.
General resin is fiber reinforced material, and general condition can only obtain the cured body of the following thickness of 10mm down, as embed again the crack then its moulding be very difficult.And unsaturation brittle resin material of the present invention is easy to moulding, also can make the bigger test specimen of thickness, as is of a size of the cured body of 100mm * 100mm * 200mm.
This resin material transparency is high, can observe the rupture process of test specimen inside and germinating, expansion and the evolutionary process in crack clearly, therefore is applicable to the research of crack propagation rule.The expansion evolutionary process of contained built-in crack such as Fig. 2 in the resin test specimen-shown in Figure 4.
Embodiment 2: the nonsaturated resin brittle material of presetting built-in crack comprises the composition of following volume ratio: 6688# unsaturated polyester resin 90ml; Methylethyl ketone peroxide 2ml, cobalt iso-octoate 1.5ml.
The preparation of unsaturation brittle resin material and to utilize resin material to make the process of test specimen as follows:
(1) measures raw material: 6688# unsaturated polyester resin 90ml; Methylethyl ketone peroxide 2ml, cobalt iso-octoate 1.5ml.
(2) stir: 90ml6688# unsaturated polyester resin and the 2ml methylethyl ketone peroxide that will measure are poured in the ripe Glass Containers, and stir, and pour cobalt iso-octoate 1.5ml then into, are stirred to once more to mix.Notice that methylethyl ketone peroxide can not directly mix with cobalt iso-octoate, also can not pour into simultaneously, otherwise chemical reaction burning even blast take place.
(3) casting: test piece mould is installed, preset the crack, the crack sheet can be bound in the mould with thin cotton thread as need.Mould is put on the horizontal stand, and the resin cast that stirs is gone in the mould.
(4) maintenance: will water under the constant temperature that the mould of filling with resin places 15 ℃ and solidify, but treat resin integral body solidify after the just demoulding, can obtain nonsaturated resin brittle material test specimen with crack in presetting.
Embodiment 3: the nonsaturated resin brittle material of presetting built-in crack comprises the composition of following volume ratio: 6688# unsaturated polyester resin 95ml; Methylethyl ketone peroxide 0.5ml, cobalt iso-octoate 2ml.
The preparation of unsaturation brittle resin material and to utilize resin material to make the process of test specimen as follows:
(1) measures raw material: 6688# unsaturated polyester resin 95ml; Methylethyl ketone peroxide 0.5ml, cobalt iso-octoate 2ml.
(2) stir: 95ml6688# unsaturated polyester resin and the 0.5ml methylethyl ketone peroxide that will measure are poured in the ripe Glass Containers, and stir, and pour cobalt iso-octoate 2ml then into, are stirred to once more to mix.Notice that methylethyl ketone peroxide can not directly mix with cobalt iso-octoate, also can not pour into simultaneously, otherwise chemical reaction burning even blast take place.
(3) casting: test piece mould is installed, preset the crack, the crack sheet can be bound in the mould with thin cotton thread as need.Mould is put on the horizontal stand, and the resin cast that stirs is gone in the mould;
(4) maintenance: will water under the constant temperature that the mould of filling with resin places 25 ℃ and solidify, but treat resin integral body solidify after the just demoulding, can obtain nonsaturated resin brittle material test specimen with crack in presetting.
Claims (1)
1. the utilization nonsaturated resin brittle material of being convenient to presetting built-in crack prepares the method for test specimen, and described nonsaturated resin brittle material comprises the composition of following volume ratio: 90～100 parts of unsaturated polyester resins; 0.5～2 part of methylethyl ketone peroxide, 0.5～2 part of cobalt iso-octoate is characterized in that, may further comprise the steps:
1) measures raw material: unsaturated polyester resin, methylethyl ketone peroxide and the cobalt iso-octoate of measuring respective volume according to proportioning;
2) stir: at first unsaturated polyester resin and methylethyl ketone peroxide are poured in the clean ripe Glass Containers, and stirred; Pour the cobalt iso-octoate of measuring then into, be stirred to once more and mix;
3) resin cast that stirs casting: test piece mould is installed, the crack sheet is bound in the mould with thin cotton thread, mould is put on the horizontal stand, and with step 2) is gone in the mould;
4) maintenance: place and carry out maintenance in the thermostat container watering the mould of filling with resin in the step 3), Thermostat Temperature Control between 15 ℃～25 ℃, treat that resin integral body is solidified after, the demoulding can obtain the nonsaturated resin brittle material test specimen with crack in presetting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100167841A CN101289572B (en) | 2008-06-16 | 2008-06-16 | Nonsaturated resin brittle material convenient for presetting built-in crack and process for preparing test piece |
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| CN2008100167841A CN101289572B (en) | 2008-06-16 | 2008-06-16 | Nonsaturated resin brittle material convenient for presetting built-in crack and process for preparing test piece |
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| CN101289572B true CN101289572B (en) | 2011-11-23 |
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| CN102167896B (en) * | 2010-12-23 | 2013-03-13 | 万峰石材科技有限公司 | Recessive initiator and a method for preparing the same and a kind of artificial stone |
| CN103773056B (en) * | 2014-01-24 | 2015-11-18 | 山东大学 | High brittle transparent rock-like materials test material preparation method |
| CN105904573B (en) * | 2016-05-06 | 2018-02-06 | 河海大学 | A kind of transparent rock mass preparation method based on 3D printing technique |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2267152Y (en) * | 1996-11-04 | 1997-11-12 | 尹明君 | Plastic-steel decoration plate or picture |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2267152Y (en) * | 1996-11-04 | 1997-11-12 | 尹明君 | Plastic-steel decoration plate or picture |
Non-Patent Citations (2)
| Title |
|---|
| 于同福等.不饱和聚酯树脂的常温固化.《热固性树脂》.2006,(第04期), * |
| 贺跃进等.复合材料层合板裂纹诊断的实验研究.《玻璃钢/复合材料》.2008,(第02期), * |
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