Video - Leader Technologies / Guoli Chemical in RubberTech China 2018

Leader Technologies Co., Ltd and Guoli Chemical attended RubberTech China 2018, we are very happy to communicated with our regular customers and new customers.
When you need rubber bonding agent HMMM, rubber antioxidant DTPD, insoluble sulfur, rubber accelerator, please feel free to contact with us.


Application suggestions of phenolic resin B-20-S

Resorcinol or B-20-S is added at step 2. Generallyresorcinol can't be added in step1 due to its significant fuming under temperature as high as to 160-180It' known to all that B-20-S is non-fuming, does it can be added in step1?
Usually, B-20-S is used in some skim compounds. One of our customers told us that when mixed with B-20-S, the skim compound got blooming. We can't see the real conditions of blooming rubber, so it's not confirmed whether the blooming is caused by addition of B-20-S. What's your comment? 
From some papers drawn by compounders, in the subsequent processing of skim compound, especially when calendering, compound mixed with resorcinol still has problem of fuming. We are confident that B-20-S can resolve this upsetting. What's your recommendations in the subsequent process?
Additionally, we don't know how long B-20-S could be stored in normal conditions?
1.  Penacolite® Resin B-20-S can be added to the first mix stage without significant fuming.  However we have seen slightly higher cured modulus if it is added in a later mix stage.  Adhesion is not affected by which mix stage B-20-S is added.  A B-20-S containing compound should not fume during calendering, however it might be slightly higher in Mooney viscosity than a resorcinol compound so other compound adjustments might be necessary if they cannot tolerate increased Mooney viscosity. 
1.Penacolite 树脂B-20-S可以在一段混炼时加入,而不会出现显著的冒烟现象。在后续混炼阶段加入时,硫化胶的模量会稍微提高。胶料的黏合力*不受B-20-S加入阶段的影响。与含有纯间苯二酚的胶料相比,用B-20-S混合的胶料其门尼粘度会稍微增加,在压延时不会出现冒烟现象;如果用户不希望(用B-20-S混合的胶料)门尼粘度增加,那么就有必要做其它混配合方面的调整。
2.  Penacolite Resin B-20-S does not usually bloom. Several things could be happening:
    a.  Because B-20-S does increase Mooney viscosity, they might be running a higher temperature during mixing or calendering, which may lead to sulfur bloom.
    b.  HMTA (hexamethylenetetramine) is very prone to blooming.  If their formulation contains HMTA, this might be causing the problem.  When changing from resorcinol to B-20-S it is necessary to lower the level of HMTA.  If there is too much HMTA in the formulation, the excess will bloom.  When using B-20-S we usually recommend a resin/HMTA ratio between 80/20 and 85/15 (i.e. 3 parts of B-20-S with 0.5-0.75 parts HMTA).  We have the ability to analytically determine the composition of the bloom if you want to send a sample.
     b.HMTA(六亚甲基四胺)易发生喷霜。如果胶料中含HMTA,可能会发生喷霜。当用B-20-S代替纯间苯二酚时,须减少HMTA用量。如果有过量的HMTA存在,过量的部分就会造成喷霜。当用B-20-S进行配合时,建议树脂/HMTA比例在80/2085/15之间(即B-20-S 3份,HMTA0.5-0.75份)。如果用户可以送付喷霜胶料样品,我们会检测出造成喷霜的原因。

3.  We do not have a definite age limit on B-20-S.  Chemically, B-20-S does not change with time.  The only issue is that over time it might pick up some moisture, which may cause it to agglomerate, making it difficult to handle in the factory.  If the resin is in the original un-opened bag this will be a slow process.

From some applications, in resorcinol-HMMM system, the ratio of resorcinol/HMMM can vary from 3/5 to 5/3, even from 1/3 to 3/1. As for methylene donor and acceptor, someone said, one of them is supposed to be excessive in compound. Actually there is no specific ratio for methylene donor and acceptor. But for modified resorcinol, such as resorcinol-80 and B-20-S, is it so?
In resorcinol-HMMM-cobalt system, regardless of active content of HMMM, B-20-S can be used less than HMMM, instead of typical formulation indicated in your presentation. What’s your comments?

As you said, I agree that people use a wide range of resorcinol/HMMM ratios.  In our experience a 50/50 resorcinol/HMMM ratio seems to work best (i.e. 3 parts of resorcinol with 3 parts HMMM).  The point I am trying to make is that with B-20-S, one does not need to use as much HMMM as when resorcinol is used.  For example, if a customer is currently using 3 parts of resorcinol with 3 parts of HMMM, we would typically recommend 3.6 parts B-20-S with 2.4 parts HMMM.  That should match the adhesion and tensile properties of the resorcinol compound (but may be slower curing).  Using more HMMM than our typical recommendation may increase adhesion and modulus slightly but will significantly increase Rheometer t'90 cure times.  Using less HMMM than we recommend can have a negative effect on adhesion.  It is a waste of money for someone to use 5 parts of resorcinol with only 3 parts of HMMM, since the resorcinol will not be fully crosslinked.  I would encourage that customer to consider using 3.6 parts of B-20-S with 2.4 parts of HMMM instead.  They will likely see much greater adhesion with the B-20-S formulation. 
在使用B-20-S时,HMMM用量要少于与间苯二酚配比时的用量。例如,如果现在有用户用3份间苯二酚和3HMMM配比,那么我们可以推荐他用3.6B-20-S + 2.4HMMM来替代,以此获得的黏合和拉伸性能与使用间苯二酚时相当,但是硫化速度有所降低。
 For a customer using 3 parts resorcinol with 5 parts HMMM, it might be necessary for them to use a higher level of HMMM to match the properties of their control compound.  In this example, I would recommend 3.6 parts B-20-S with 3.6 parts HMMM as a starting point.
From a practical point of view it is important for the methylene donor (HMMM) to be in excess.  One mole of HMMM can theoretically react with 6 moles of resorcinol.  Theoretically, if one used 3 parts of resorcinol, it is only necessary to use 1.76 parts of HMMM.  However our experience shows us that we obtain better adhesion and higher modulus if 3 parts of resorcinol are used with 3 parts of HMMM - a 171% excess of HMMM!  Since B-20-S is already partially crosslinked, it is not necessary to use as much HMMM as is used with resorcinol, however there should still be an excess of HMMM.

We have not evaluated Schenectady's A250.  We have been unable to obtain a sample of it.  If you can obtain a sample for us, we would appreciate it.

We have looked at the other resin in the report, PN759.  Attached is our report on this material.  The big negatives for PN759 and likely the Schenectady resin (or any phenolic resin) are greater heat buildup (hysteresis, tangent delta) than B-20-S and poorer aged adhesion.  Your customer's data show's a 9% increase in heat build-up with the Schenectady resin and a 24% increase with PN759.  Our testing confirms the PN759 results.  One of the unique features of the PN759 resin is that the tangent delta INCREASES with increasing temperature.  This is very unusual and very bad for tire performance.  With both B-20-S and resorcinol, the tangent delta decreases with increasing temperature.  As a tire fails, it builds up heat.  With PN759 (or possibly Schenectady's A250) in the compound, the rubber becomes MORE hysteretic, causing the rubber temperature to build at a faster rate than if the compound had contained resorcinol or B-20-S, which actually becomes LESS hysteretic with increasing temperature.  There is the potential that a tire containing PN759 (or possibly Schenectady's A250) could fail faster than if it had contained resorcinol or B-20-S.

The aging conditions in your customer's report are relatively mild.  Even with their relatively mild aging conditions, the Schenectady resin is worse for salt water aging.  I would encourage your customer to run longer aging tests.  A good aging test, which doesn't require any special equipment is to age the sample 2-3 weeks in water at 85C.  When we water age, we place the samples in a glass tray, cover the tray with aluminum foil to prevent most evaporation, and place the tray in an 85C oven.  Even with the cover, it is necessary to adjust the water level every several days.  A longer term test like this, should show a clear advantage to using B-20-S.  It is very difficult to tell one resin from another when one only ages 48 hours at 100C.

The only significant difference between B-21-S and B-20-S is that B-21-S is faster curing than B-20-S.  The other differences you mention are just experimental error.  Chemically, B-21-S has a higher free resorcinol content and a lower amount of styrene than B-20-S.  The CRL-410 resin is slower curing than B-20-S and has a lower free resorcinol content and a higher amount of styrene than B-20-S.  (Therefore, one could conclude that the amount of styrene in the resin effects the cure rate and the amount of free resorcinol.)

Question:One of our customer said they made a virtual dynamic test of all-steel tire incorporated with B-20-S, the result seemed not good. Main issue focused on the heat generation. They guess it may be related to its relatively high styrene content. We’ll let you know the details of that report when that customer finish.
We think its hydrophobic property may be relevant to the high styrene content, but, for B-20-S, how does the styrene influence on other properties of rubber? Could it act as a plasticizer compared with B-19-S or B-21-S? For these free styrene, they contain double-bonds in their molecular structure, do they consume some sulfur in vulcanization?
Sometimes we are told the rubber stocks incorporated with B-20-S is difficult to process in mixing or in calenderring, is it because of the slight pre-crosslinking of resorcinol and formaldehyde?
We know B-21-S is slightly styrenated, someone said it’s the only difference between B21 and B19, really?
Answer:Yes, I received your samples of A250 and A150.  We have the A250 on test, but have not started testing the A150.  We should have results on A250 in a couple of weeks.  We heard that Schenectady is no longer promoting the A150.  Have you heard the same?

For the customer that made a test with an all steel tire and saw a problem with heat generation, what material was B-20-S compared to?  How much HMMM did they use?  We have not seen any problems with heat generation and B-20-S.

Styrene does help to make B-20-S hydrophobic.  I would not call the styrene in B-20-S a plasticizer, however, we see slightly lower Mooney Viscosity with B-20-S than with B-19-S.
 Typically, a B-20-S compound is more difficult to process than a resorcinol or a Rhenogran 80 compound.  The B-20-S compound is more difficult to process because B-20-S has a higher molecular weight than resorcinol and causes a higher Mooney Viscosity.  Resorcinol is a monomer.  B-20-S is an oligomer, some of the resorcinol has been pre-reacted with formaldehyde.  The molecular weight of resorcinol is 110.11.  The number average molecular weight of B-20-S is about 450 --four times bigger!!
通常情况下,B-20-S胶料会比纯间苯二酚或间80的胶料更难加工,这是由于B-20-S分子量更高,由此而造成胶料的门尼粘度较高。纯间苯二酚是一种单体。B-20-S是低聚体,它含有的间苯二酚已有部分与甲醛发生预反应。间苯二酚的分子量是110.11,而B-20-S 的平均分子量是450,是间苯二酚的四倍。
B-21-S contains 4 basic ingredients, resorcinol, formaldehyde, styrene and resorcinol polymer.  B-19-S contains 3 basic ingredients, resorcinol, formaldehyde and resorcinol polymer.  The ratios of these ingredients are different in B-19-S and B-21-S.  We did not just add styrene to B-19-S to make B-21-S.


What's the significance of your company logo?

1. It can better reflect our company image “LEADER”
2. There are two colors in the logo, Red and Green.

In China, “Red” has meaning of passion and development, and “Green” has meaning of vitality and environmental protection.
So, the logo means our company’s development and environmental protection.


It looks like “LD”.

“L” looks like molecular formula, which means Chemicals.

"D" looks like a Tire, the tire's color is Green, means Green Tire

The whole logo means our chemical products used for Green Tires production.

4. The red color at front of green color, it means company’s development cannot damage the environment. We must protect our environment with the development of company.

What is the best rubber vulcanizing agent?

What is the best rubber vulcanizing agent?
The answer is Insoluble sulfur.

Insoluble sulfur is amorphous form of sulfur, which is made from the heat-polymerizing of sulfur, also can be obtained by reacting sulfured hydrogen with sulfur dioxide. Insoluble sulfur is macro-molecule polymer, and there are several thousand of sulfur atoms in its molecular chains. Since it doesn't dissolve in carbon disulfide, it is called insoluble sulfur or polymeric sulfur. Currently insoluble sulfur is mainly used in rubber industries.

Insoluble sulfur is an important rubber additive agent. It improves product quality, wear ability and resistance to both fatigue and ageing. In addition to being universally recognized as the best vulcanizing agent, it is widely used in the manufacture of tire, rubber pipe, shoes, cable and wire insulating materials, latex, all kinds of automobile rubber parts and is also a necessary component of belt tires.

Compared with sulfur (rhombic sulfur), insoluble sulfur has following merits:

1. Insoluble sulfur exists in rubber in a dispersive state. It can prevent the booming of rubber, having a better viscosity, and at the same time can ensure the outer appearance of the products with light color.

2. Insoluble sulfur can disperse uniformly in rubber, so it can prevent the conglomeration of sulfur, and reduce the tendency of being scorched during store.

3. Insoluble sulfur can prevent the blooming of rubber during its store. It make it possible to keep rubber's characteristics uniform, overcoming the defects of bad viscosity resulted from blooming, avoiding the pollution of products as well as moulds and cut down the gelatinizing step specially appended for preventing blooming.

4. No migration in adjacent layers of rubber. The migration speed of common sulfur is very high especially in butyl rubber, and with the incorporation of insoluble sulfur, such phenomena can be avoided.

5. Shorten the vulcanization time. When reaching the temperature for vulcanization,insoluble sulfur will go through a stage of activation, that is to say, a chain de-polymerization, which can quicken the vulcanization speed, reducing the amount of sulfur used, improving the aging characteristic of products.

Therefore, due to its non-blooming characteristic, insoluble sulfur is widely used in the manufacture of radial rubber and other synthetic rubber products, also in the light-colored rubber products in which common sulfur is incorporated in high proportion.


Introduction of Leader Technologies Co., Ltd

Leader Technologies Co., Ltd is global advanced manufacturer and supplier of Rubber Chemicals in Shanghai China, and we are always driving the development of rubber chemicals industry.
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With the advantage of modern logistics and convenient transportation in Shanghai, our products exported to North and South Americas, Canada, Korea, South-east Asia, Middle East, Africa, India, Iran etc. Our products are widely used for tires, rubber tube & belts and so on, and wined good reputation in the market at home and abroad.
Our Capacity:
30,000MT/year JERINA™-Functional Additives
30,000MT/year PENORL™-Rubber Adhesive
15,000MT/year LEATEZ™-Insoluble Sulfur
10,000MT/year VESTOX™-Rubber Antioxidant
20,000MT/year LEATEC™-Rubber Accelerator
Innovation and development:Leader Technologies has a very experienced team to provide technical supports on tire production, such as Technological Innovation, Tire Formulation Improvement, Workshop Construction Planning, Equipment Modification, Tire Quality Improvement etc. We are dedicated to providing one-stop services for the tire industry.
As a professional manufacturer, advanced production equipment and precision testing instruments have been used in our factories. Leader Technologies has a strong R&D team to focus on the research and develop Rubber Functional Additives for rubber & tire industries. With the investment and expansion of capacity step by step, Leader Technologies aims to become a large-scale & respected international company.


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