Technical standard of Koway

To build the world's leading epoxy chemical enterprise

Product technical standard

Adhesive for GB24264-2009- facing stone

This standard specifies the adhesive for decorative stone (hereinafter referred to as adhesive) the terms and definitions, classification and code and marking, general requirements, test methods, inspection rules and signs, packaging, transportation and storage of the standard is suitable for decorative stone products production and installation of various types of adhesives used to.

Two, GB/T, 29059-2012- ultra-thin stone composite board

This standard specifies the thin stone composite board (hereinafter referred to as the composite board) definition, product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage hub etc.. This standard applies to building adornment uses ultrathin stone compound board.

Three, GB, 18583-2008- interior building decoration materials, adhesives, harmful substances limit

This standard specifies the limits of hazardous substances in adhesives for interior building decoration and their test methods. This standard applies to interior building decoration adhesive.

Four, ROHS standard

RoHS RoHS is the standard edit "limit the use of certain hazardous substances in electrical and electronic equipment" (the Restriction ofthe use of certain hazardous substances in electrical and electronic equipment) the abbreviation English. Related products will be sent to specialized laboratories for testing, to test the product will be split into single material is homogeneous materials, including lead, cadmium, mercury, six chromium, polybrominated biphenyls (PBB), two polybrominated diphenyl ether (PBDE) and other six kinds of harmful substances are in line with the RoHS directive requirements, if the line can be RoHS qualified reports and certificates, if not met, will have to find other products to meet the requirements of replacement.

Five [LD50] [median lethal dose]

LD50 [median lethal dose] is the most important parameter for evaluating the magnitude of acute toxicity of chemicals. It is also the basic standard for acute toxicity classification of different chemicals. The greater the acute toxicity of chemicals, the smaller their LD50 values. Often with ED50 [half maximum effect concentration] with the calculation of treatment index LD50/ED50, to evaluate the safety of drugs, treatment index of relatively large drug safety. LD50 better, is said to very high concentrations can lead to the death of ED50 half of the smaller the better, mean dose can rarely play the role of a single above is of no significance, LD50 ED50, is also a great danger so with the ratio of drug safety description but, LD50 alone can only describe the toxicity of the drugs.

Product testing method

1.yellow resistance test:

AB according to weight ratio, stirring for three minutes until the mixture is uniform, the vacuum poured into a mould, curing 7 days standby static at room temperature. The sample is then removed from the oven at the 70 - degree UV box PT-2030A, 8h, and compared to the grey card rating (ISO105-A02:1993)

Determine product testing level.

2.resistance to old heat test methods:

The prepared specimens were maintained for 14 days under standard test conditions, and then the specimens were placed in (70 + 2) DEG C blast oven for 14 days. The drawing joint is glued to the stone substrate with suitable high strength adhesive, and the tensile strength of the specimen is measured after 24h maintenance under the standard test condition.

3.test method of applicable period:

The amount of sample into a 100ml beaker, add the specified amount of curing agent, made of 50g mixture as the starting time to add hardener specimen, then the beaker is placed in the water bath temperature (23 + 1) C constant temperature water bath, and makes the surface located below the liquid level of about 2cm. Continuous observation samples, read the sample produced Yizhuang time from the start time to produce different time period for. Sample Yizhuang, refers to the apparent viscosity increased, gel, precipitation, separation, discoloration due to adhesive for the phenomenon. The same sample was measured two times, and its average value was expressed by min.

4.pressure shear test method and data of soaking, heat treatment and freezing cycle:

1) under standard test conditions, 10 specimens were maintained for 7 days, and then entered (23 + 2) Celsius for 7 days. The specimens were removed and dried with cloth to determine the compressive shear bond strength.

2) under standard test conditions, 10 specimens were maintained for 7 days, and then the specimens were placed in (80 + 2) DEG C blast box for 7 days. Air circulation should be guaranteed at each time. The specimen is taken out and 24h is placed in the standard condition to test the bond strength of compression shear.

3), placed on the stone substrate before and after coated with 1min adhesive on the back with a spatula. The prepared specimens were maintained for 7 days under standard test conditions, and then maintained for 21 days in (23 + 2) C water. Specimens were taken out of water and subjected to freeze-thaw tests. Every freeze-thaw cycle is:

A: take the specimen out of water and put it in a low temperature case (-20 + 3) Celsius, 4H + 20min

B: the specimen from the cold box out, immersed in (23 + 2) C water keep 4H + 20min

Repeat the 50 cycle. After the last cycle, the specimen is taken out and cured under standard test conditions. The drawing joint is glued to the stone base with suitable high strength adhesive. Continue to maintain the specimens under standard test conditions, 24h, and determine the tensile bond strength.

Color deepening principle

Because the stone has a natural gap, pores, tiny holes, it is easy to absorb the outside erosion. Therefore, according to this principle, the glue adding special toner, painted on the stone, glue and toner synchronization into the stone, glue after curing also toner also solidified into the interior of the stone to deepen.