Brief analysis: how to compare and select polyurethane rigid foam silicone oil
Rigid foam homogenizing agent (hereinafter referred to as “silicone oil”) model selection and the definition of the dosage is of great importance, which is directly related to the final product of the foam pore structure, shrinkage resistance, heat preservation and other practical performance advantages and disadvantages.
Experimental Objects
Conventional hard foam silicone oil in use as reference A, compared with unknown performance hard foam silicone oil B, C, D, E, etc.
Test apparatus
(Here only focus on listing the parts that are different from the conventional test)
1, variable-speed electric drill: 300w or so, available knob gear to adjust the speed;
2, about 100ml size of disposable transparent plastic drinking cups: to be a little hard, lest the mixing time to hold the deformation is difficult to hold.
Blank mother liquor preparation example
1、High moisture, low density type manual slow material
Polyether 4110: 100
Water: 1.8
Cyclohexylamine: 1.0~2.0 (depending on the ambient temperature and material temperature control)
141B: 25
2、Low-moisture, high-density type handmade slow-moving material
Polyether 4110: 100
Water: 0.5
Cyclohexylamine: 1.0~2.0 (depending on the ambient temperature and material temperature control)
141B: 7
The total amount of the above blanks will be scaled up by a factor of n depending on the type of silicone oil to be compared. Shake well and divide into n equal parts.
Foaming
1、High moisture, low silicone oil, low density type manual slow material
Will n equal parts of the blank material were added to 0.5 parts of the A, B, C, D silicone oil, fully shaken well after standing, to see its compatibility and transparency.
Adjust the speed of the variable speed drill to the appropriate gear: make sure that the mixing speed belongs to the “medium-slow” state, and absolutely do not allow high shear fast mixing.
Foam the components with 0.5 parts of silicone oil at the same speed, in the same proportion (about 12g of white material + 12g of black material) and at the same mixing time within 20 minutes.
Reminder: Do not break the mushroom head whole crooked. After foaming and shaping can only be done at the bottom of the cup respectively mark in order to compare objectively and fairly.
2, low moisture, low silicone oil, high density type handmade slow material
Operation with (i), about 20 grams of white material + 20 grams of black material
3, high moisture, high silicone oil, low density type handmade slow material
The test (i) in the remaining white material in proportion to the respective amount of silicone oil to 1.0 parts, and then the same conditions foaming
4、Low moisture, high silicone oil, high density type handmade slow material
Test (ii) in the remaining white material of each type of proportion to the amount of silicone oil to 1.0 copies of their respective, and then the same conditions of the foam
[Comparison, analysis
Mix the foams in test (i) and (ii) together with the naked eye to separate out the superiority and inferiority of the apparent bubble holes (fine density and uniformity of the bubble holes), and then look at the bottom to determine the ranking of these silicone oils;
Will test (iii) in the foam mixed together with the naked eye to separate out the apparent vesicle superiority and inferiority (vesicle fine density, uniformity), and then look at the bottom to determine the row position of these silicone oils;
(i), (iii) experiments in the same silicone oil type of different dosage of the bubble put together to compare, to see the amount of silicone oil to increase the fine density of the bubble holes, the uniformity of whether there are obvious improvements
Between 2 and 4 is also true, if necessary, the use of sharp edges to cut sections to compare the internal vesicles
